Measurement of gas content in non-traditional container rocks

FIELD: measurement equipment.

SUBSTANCE: invention relates to measurement of total gas content in non-traditional container rocks, such as gas-bearing container beds, which may be found in sedimentary rocks, volcanic or metamorphic rocks. The method includes stages of well drilling in the measurement range in a container bed to create a volume of drilling mud in annular space, which contains fragments of drilled rock and gas. At the same time the volume of annular space has the front edge and the rear edge, diversion of the front edge of the annular space volume so that entire volume of annular space is trapped in a degassing system for storage without its exposure to atmosphere, interruption of diversion of annular space volume after trapping of the front edge of annular space volume in the degassing system for storage in order to determine quantity of gas in terms of annular volume; and also in-situ calculation of the total gas volume in the container bed with account of gas and fragments of drilled rock in terms of fragments of drilled rock and gas, contained in the annular space volume.

EFFECT: increased reliability and accuracy of the method and the device for measurement of total gas content in non-traditional container rock.

25 cl, 2 dwg

 

The SCOPE of the INVENTION

The present invention relates generally to the measurement of the total content of gas in unconventional reservoir rocks, such as unconventional gas-bearing reservoirs that can occur in sedimentary rocks, volcanic or metamorphic rocks.

More specifically, the present invention relates to a method and apparatus for measuring in situ the Total volume of gas in unconventional gas reservoir-the reservoir, representing the gas-bearing reservoir, such as gas-bearing reservoir, consisting of dense Sandstone, shale gas-bearing strata, coal gas reservoir, gas-hydrate reservoir, and similar reservoirs. Although the following description refers mainly to this particular application, it should be clear that the present invention is not limited to this and may be, for example, applied to measure the Total volume of gas in unconventional oil reservoir-the reservoir.

Background of the INVENTION

The decrease in production from conventional hydrocarbon reservoir in combination with the increase in world energy consumption has led to a serious shift towards commercial use of unconventional hydrocarbon resources (resources that require �primenenie technology and higher investment levels, than standard industrial levels of technology and investment). This change in the system of representations was due to higher gas prices in combination with major technological advances over the last 20 years or similar achievements. The question associated with unconventional gas, is brought to the forefront in relation to conventional oil, due to its abundance from a geographical point of view, and due to the fact that its use as a fuel does not cause such harm to the environment, as the burning of oil or coal. In fact, gas is usually seen as a “transition fuel” on the eve of the emergence of cleaner, renewable fuels.

Conventional hydrocarbon reservoirs are reservoirs-reservoirs, which can be operated with cost-effective performance, which can be mined economically viable amounts of hydrocarbons without much stimulation or without the use of special technologies. Conventional hydrocarbon reservoirs are reservoirs-reservoirs with high and medium permeability, in which a vertical well can be drilled using conventional drilling rig with a perforation in the productive interval and the bore, which operates�I performance profitable from a commercial point of view, as well as allow you to produce economically viable quantities of hydrocarbons involving a minimum of means. Unconventional hydrocarbon reservoir is a reservoir-a reservoir that cannot be operated with cost-effective performance, or this layer-manifold which cannot be operated with the possibility of extraction economically viable amounts of hydrocarbons without great intensification of the flow or without the use of special technologies, such as steam flooding. Typical unconventional reservoirs-reservoirs are gas-bearing reservoir, consisting of dense Sandstone, shale gas-bearing strata, coal gas reservoir, gas hydrate reservoir and the reservoirs with heavy oil.

Rigs of conventional type, which are used for formation of wells, typically include a system of drilling fluid circulation, in which the corresponding drilling fluid (commonly referred to as “drilling mud”) is circulated under high pressure and is directed down through a hollow drill pipe (articulated metal pipe), to a point near or at podvigaylo the bottom of the wellbore, and then returning to the surface through the annular space formed between the drill pipe and the wall of the wellbore. The drilling fluid serves to cool the drill head and the removal of debris of drill cuttings during drilling, and also to suspend drill cuttings debris during the temporary stop drilling. Drilling mud is returned in a similar way to the surface, includes fragments of drill cuttings (which can be subsequently separated, so that drilling fluid can be re-applied), but also any gas that enters the borehole from any geological structures through which is carried out excavation (including both explored and unexplored hydrocarbon reservoirs) during drilling.

During normal operation of drilling when the drilling mud reaches the surface, it passes through a large valve that can encapsulate or isolation wells to stop the inflow of formation (geological) fluids in the wellbore (with potentially dangerous issue to the surface) in the moment when faced with areas of high pressure which exceeds a limiting hydrostatic pressure of the drilling fluid in the wellbore. A device allowing to carry out this process, often referred to as “the blowout preventer”. In the upper part of the blowout preventer drilling fluid enters the device� to reject stream (often referred to as “pipe with funnel”). From this place the drilling fluid enters the discharge line, which feeds by gravity into a system of storage tanks drilling mud.

The pipe with funnel is part of the large diameter tubing attached to the top of the blowout preventer and communicating with the atmosphere, which is attached to the discharge line through the side outlet. Before entering the storage tanks drilling mud is required for the separation, collection and/or processing by means of equipment such as nets and sieves for removal of drill cuttings debris, filters to remove dirt and sand, as well as cleansing devices for the extraction of reusable drilling fluid, which can then be subjected to recycling (as described above) down through a hollow drill pipe to a point near or at podvigaylo the bottom of the wellbore. In addition, can be sent to the issuance of any gas contained in the drilling mud, through the pipe with a funnel, and in various other places downstream until the storage tanks drilling mud. Drilling fluid in this system may be referred to as “recirculating drilling mud”.

It should be clear that the main function of blowout preventer is Herme�the organization well (or more specifically in sealing the annular space) before drilling or after drilling or the temporary cessation of drilling to prevent unintentional leakage of fluids and gases. However, during the drilling blowout preventer remains open in order to ensure passing it through a drilling mud to ensure the normal operation of the system of circulation of drilling mud.

There is usually a zone of interest, and which explore by drilling, is directing the drilling so that the borehole passed through this area of interest.

One of the main problems arising in the conduct of economic evaluation of the majority of unconventional gas resources, is the high degree of uncertainty associated with modern methods of measuring in-situ the Total volume of gas in the zone of interest in discovering the geologic stratum-header.

The gas in unconventional reservoirs is usually divided into three components:

The total volume of gas = Free gas + Adsorbed gas + Dissolved gas

Free gas is present in the pore space in natural cracks or klivenyi cracks (in the case of the coal seam); Adsorbed gas is present in the semi-monoclonal state, associated about�commonly, but not exclusively, with organic carbon using weak baths der Waals intermolecular forces; and the Dissolved gas is a gas dissolved in the formation water, liquid hydrocarbon, or combinations thereof. Dissolved gas can be an important component in some oil reservoirs. As typical of unconventional gas resources, in the case of dense Sandstone, Free gas is a major part of the Total volume of gas, while in the shales of the components in the form of Free gas and Adsorbed gas in General comparable. In contrast, in the coal seam is dominated by Adsorbed gas, although it may present a significant fraction of Free gas.

Following are the ways which are most often used to assess in situ the Total volume of gas in unconventional gas reservoir-the reservoir (or one of the above-mentioned components of Total gas).

1. Gas logs - this method provides a qualitative indication of the Total volume of gas, which is influenced by numerous drilling parameters.

2. Desorption (i.e. degassing) conventional core or fragments of drill cuttings generated during the drilling operation, this method allows to attempt to quantify the Total volume of gas.

3. Porous�nce / saturation water from conventional core or drill cuttings debris, obtained during the drilling operation, - this method allows you to make an attempt for the quantitative determination of Free gas in the pore spaces.

4. Porosity / water saturation from ordinary electrocoating charts - this method also allows you try the quantitative determination of Free gas in the pore spaces.

5. “Non-traditional” electrocautery charts - their use provides the possibility to quantify as Free gas in the pore spaces, and Adsorbed gas, based on the Total organic carbon content, thus providing a measure of the Total volume of gas.

6. Adsorption isotherms obtained on the basis of conventional core or fragments of drill cuttings during the drilling operation, - this technique provides a quantification of the Adsorbed gas.

7. Methods based on the use of the core by maintaining reservoir pressure, these methods basically allow quantitative determination of Total gas in the reservoir-the reservoir based on the capture of gas in the airtight container when the bottom hole pressure in the well and the subsequent lifting of the container (usually at a gas pressure of several thousand pounds per square inch) on the surface. (Note: 1000 pounds per square�th inch = 70,3 kg/cm 2).

The above options 1-5 possess a high degree of uncertainty for several different reasons. As for option 6, despite the fact that it is generally accurate, it is used to determine only one component of the Total gas content, which for many types of unconventional gas-bearing reservoir is not particularly applicable. Finally, while option 7 is the most accurate for assessment of the Total content of gas in unconventional gas reservoir-the reservoir, the use of such methods is currently problematic from the point of view of (a) availability of the application, (b) logistics c) cost (d) complexity, e) security and (f) the coefficient of performance of mechanical drilling.

Turning to a more specific consideration of the most common types of unconventional gas-bearing reservoir and options used to measure them in the gas content, coal gas-bearing reservoir is the most widely used option 2 (using container desorption of conventional core) for measurement of Total gas content in these relatively shallow reservoirs (approximately less than 3,000 feet (914, 40 m)). Unfortunately, despite all the efforts made for faster raising of core pofs�rnost, the time of extraction of the core affects the amount of trapped gas in the desorption containers on the surface. This usually leads to an underestimation of the in situ Total gas content. Needless to say, during the extraction of the core surrounding limiting the hydrostatic pressure of the drilling fluid is reduced, and consequently, there is a gas leak from the core.

For compensation must be applied the correction for the “Lost gas”, which is performed by extrapolating the trend early degassing measured as close as possible to the temperature of the reservoir zones in the desorption containers on the surface, back to “zero time”. The latter is defined as the time at which the differential pressure at the interface of the drilling mud is the core varies in the range from excessive balance to insufficient balance, and begins a gas leak. The greater the depth of the zone of coring and the longer the extraction time, the greater the proportion and the uncertainty of such a component, like a Lost gas. The high uncertainty associated with the determination of Lost gas, is the main drawback in this approach to the problem.

To date, in the case of gas-bearing shale reservoir determination of normal gas� was carried out by combined application of the above 3 options, 4 or 5 option 6, which has the effect of adding Free gas and Adsorbed gas in order to ensure the results to determine the Total gas content. For these reservoir desorption is unreliable due to the large component, like a Lost gas associated with the extraction of the core from great depths, which are usually found shale gas-bearing reservoirs. The problem with the approach to solving the challenges associated with shale gas is that the measurement of porosity, particularly water saturation, which is usually carried out the calculation in respect of such component, as Free gas, are subject to significant uncertainty.

The applicant of the present invention has assets of deep unconventional gas field pool Cooper (Cooper Basin) (including dense Sandstone, shale, and coal), in the range of from about 8000 to 12000+ ft (2438,40 to 3650,76 m), and for the reasons described above, is experiencing difficulties with accurate quantitative determination of the Total gas content. To assess this reservoir zones using known techniques used in the industry, engaged in production of coal seam gas, can be obtained in the usual Kern (recoverable with the help of drill pipe and cable) and standard desorption to�RNA can be carried out when attempting to estimate the Total gas content. But, unfortunately, retrieval time with these depths (plus processing time on the surface) generally is in the order of 2-10 hours.

It is in serious contradiction with what is considered “acceptable” in the industry, engaged in the extraction of gas from shallow coal seams (i.e. time relating to Lost gas, constituting less than 1 hour, and usually only 15 minutes). This underlines the seriousness of the problems encountered in the evaluation of deep zones and which is typical in the case of many unconventional reservoir. In fact, there is a need for very large adjustments for Lost gas with a high degree of uncertainty and the possible unreliability, potentially in excess of the actual amount of the extracted gas.

Although Option 7 may represent an acceptable alternative from a technical point of view, the equipment required to implement methods to measure the pressure on the core, is costly and not very accessible, but also leads to unnecessary (or at least undesirable) difficulties of a mechanical nature.

The aim of the present invention is to provide a more reliable and accurate method and device for measuring the Total content of gas in unconventional reservoir rock (which sedimentary igneous or would cause�quarter breed), and, in particular, to measure in situ the Total content of gas in unconventional gas reservoir-the reservoir, compared with the above-mentioned Options 1-6, as well as more convenient and cost effective method and apparatus, in comparison with Option 7. In this respect, it should be clear that although the method and the device was created with the purpose of their application for unconventional gas-bearing reservoir, however, these method and device can be applied when measuring in-situ the Total content of gas in unconventional oil reservoirs.

The reference to any prior art in this description is not an assertion and should not be taken as approval or any form suggests that this prior art forms part of common knowledge in any country.

A BRIEF SUMMARY of the INVENTION

According to the present invention provides a method of measuring in-situ the Total content of gas in unconventional reservoir rock, which includes the following steps:

(a) drilling wells in the measurement interval in the reservoir-the reservoir for the formation of the drilling fluid in the volume of the annular space, which contains fragments of drill cuttings and gas, the volume of the annular space has a front edge and a rear edge;

(b) �tweenie the front edge of the volume of the annular space thus to capture the entire volume of the annular space in a degassing system for storage without exposure to the atmosphere;

(c) termination of assignment of the volume of the annular space after catching the front edge of the volume of the annular space in the degassing storage system;

d) measuring the volume of gas in the degassing system for storage for the purpose of determining the amount of gas in the calculation of the volume of the annular space; and

e) calculating in-situ Total content of gas in the reservoir-the reservoir based on the number of gas and debris drill cuttings in the calculation of the volume of the annular space.

In a preferred embodiment according to the method of the present invention is used in a drilling machine, which includes a system of drilling fluid circulation, and the blowout preventer through which can be implemented recycling of drilling mud from the wellbore and into the wellbore during normal operations drilling. Preferably, the simultaneous closing of the blowout preventer and the opening of all the valves for the blowout preventer leads to the abstraction of the front edge of the volume of the annular space thus to capture the volume of the annular space in a degassing system for storage without exposure to the impact of ATM�sphere. In addition, preferred is the simultaneous opening of the blowout preventer and closing of the valves for the blowout preventer, which terminates in a degassing system for storing, after catching the front edge of the volume of the annular space in the degassing storage system that interrupts the discharge of drilling mud. In this respect, the above-mentioned “simultaneous opening and closing is preferred theoretically achievable goal. It should be clear that the reference in this description to the simultaneous opening and closing is a reference to opening and closing, which is simultaneous to the extent practicable.

Drilling fluid may be either recirculating drilling mud or fresh drilling mud. Recirculating drilling mud must be the same drilling fluid that is circulated through the circulation of drilling fluid during normal operations of drilling, and must be subjected to exposure by using any of the commonly used equipment for separation, collection and/or processing, such as nets and sieves for removal of drill cuttings debris, filters to remove silt and sand, as well as cleansing devices, before re-introduction into the circulation system of the Boers�solution at the appropriate time for carrying out the method according to the present invention.

Fresh drilling fluid may be alternately applied, and in fact may often be preferred for the application, representing a portion of the drilling fluid containing gas and not containing solid particles, specially prepared in a separate location relative to the reservoir for regulating the drilling fluid and injected into the circulation system of the drilling fluid at the appropriate time for carrying out the method according to the present invention. With this in mind, the link in this description to “drilling fluid” includes any reference to recirculating drilling mud or fresh drilling mud, unless specific reference is made to one or the other as the preferred source of drilling mud.

According to the present invention it is also proposed a method to measure the in-situ Total content of gas in unconventional reservoir rock with the use of a drill rig, which includes a system of drilling fluid circulation, including the blowout preventer through which can be implemented recycling of drilling mud from the wellbore and into the wellbore during normal operations of drilling, the method includes the following steps:

(a) drilling wells in the measurement interval in the reservoir-the reservoir for the formation of the drilling fluid at about�EME annular space, which contains fragments of drill cuttings and gas, the volume of the annular space has a front edge and a rear edge;

(b) simultaneous closing of the blowout preventer and the opening of all the valves for a blowout preventer for diverting the leading edge of the volume of the annular space thus to capture the volume of the annular space in a degassing system for storage without exposure to the atmosphere;

(c) after catching the front edge of the volume of the annular space in a degassing system for storage, the simultaneous opening of the blowout preventer and closing of the valves for the blowout preventer, which terminates in the degassing system storage to interrupt the discharge of the volume of the annular space;

d) measuring the volume of gas in the degassing system for storage for the purpose of determining the amount of gas in the calculation of the volume of the annular space; and

e) calculating in-situ Total content of gas in the reservoir-the reservoir based on the number of gas and debris drill cuttings in the calculation of the volume of the annular space.

According to the present invention proposes a device for measuring in situ the Total content of gas in unconventional reservoir rock, wherein the device includes:

(a) drilling machine, with�osoby to carry out drilling in the range of measurement in gas-bearing reservoir-the reservoir for the formation of the volume of drilling mud in the annular space, which contains fragments of drill cuttings and gas, and the volume of the annular space has a front edge and a rear edge; and

(b) degassing system for storage, is able to capture the entire volume of the annular space without exposure to the atmosphere at a time when there is an abstraction of the front edge of the volume of the annular space, to the interruption of the discharge volume of the annular space after catching the front edge of the volume of the annular space in a degassing system for storage; whereby the volume of gas in the degassing system storage can be measured to determine the amount of gas in the calculation of the volume of the annular space, and the Total content of gas in-situ in the gas-bearing reservoir-the reservoir can be calculated from the quantities of gas and debris drill cuttings in the calculation of the volume of the annular space.

According to the present invention also proposes a device for measuring in situ the Total content of gas in unconventional reservoir rock, wherein the device includes:

(a) drilling machine, which contains a system of circulation of the drilling fluid containing the blowout preventer through which drilling fluid may be recycled from the wellbore and into the wellbore during normal operations Bure�Oia, while drilling machine capable of drilling wells in the range of measurement in gas-bearing reservoir-the reservoir for the formation of the volume of drilling mud in the annular space, which contains fragments of drill cuttings and gas, and the volume of the annular space has a front edge and a rear edge; and

(b) degassing system for storage, is able to capture the entire volume of the annular space without exposure to the atmosphere at a time when there is an abstraction of the front edge of the volume of the annular space through the simultaneous closing of the blowout preventer and the opening of all the valves for the blowout preventer, wherein the discharge is interrupted after the capture of the front edge of the volume of the annular space in a degassing system for storage by simultaneous opening of the blowout preventer and closing of the valves for the blowout preventer, which terminates in a degassing system for storage;

whereby the volume of gas in the degassing system storage can be measured to determine the amount of gas in the calculation of the volume of the annular space, and the Total content of gas in-situ in the gas-bearing reservoir-the reservoir can be calculated from the quantities of gas and debris drill cuttings in the calculation about�eat annular space.

By way of explanation, it should be noted that according to the present invention requires the measurement interval, which should be carried out drilling, and, preferably, the annular space filled with drill cuttings debris (volume of the annular space and formed in the measurement interval in a degassing system for storage, preferably located on the surface, as close as possible to the drilling machine. The volume of the annular space should not be exposed to the atmosphere in order to prevent the loss of any gas from the volume of the annular space, which leads to the need of this temporary non-standard derivations of the system of circulation of drilling fluid at the surface (regardless of whether the drilling mud is recycled drilling mud or fresh mud).

During trapping in a degassing system for storing fragments of drilled solids can precipitate from the suspension, the gas can accumulate, for example, in free space left over product in the tank, and may be the entire contents of the degassing drilling mud for some period of time, as will be described in more detail below.

Thus, according to the present invention, it becomes possible capture of gas and debris �burannoe breed in the volume of the annular space, advantageously, by isolating the system of circulation of drilling fluid from the atmosphere. Needless to say, instead, to allow the drilling mud to reach the open pipe with a funnel on the surface, the flow of the drilling fluid is preferably directed downward, for example, the nipple line (or in any other suitable line, preferably extending from the support base or near the support base blowout preventer) by closing pipe dies or annular preventer blowout preventer. Such hydraulic devices usually perform pinching around the drill pipe to seal the annular space between the drill pipe and the wall of the wellbore, sealing wells and efficient insulation system of drilling fluid circulation. Why can't leak gas into the atmosphere (through the pipe with funnel) until, until the re-opening blowout preventer. The end result is that the entire volume of the annular space associated with the measurement interval during drilling, preferably with the entire content of the gas is being diverted to a degassing system for storage, instead of being subjected recycling in the usual way with the direction in tanks for storage� drilling mud gas leaks into the atmosphere. In this respect, although in this case (and throughout the description) refers to “the entire volume of the annular space, subjected to abduction and capture, as will be explained below, it should be clear that it is most likely that either slightly more or slightly less than the actual volume of the annular space, will be subjected to probably the abduction and capture depending on the accuracy achieved during the operation.

Also it should be clear that a maximum of one volume of the annular space may be subjected to trapping at the same time, as the normal operation of drilling cannot happen in that time, as the closed blowout preventer. However, the circulation of drilling fluid may continue (for example, the drill bit suspended above the bottom), which allows circulation of the volume of the annular space outside the well bore above method to trap.

As for the degassing system for storage and measurement of the captured gas in the volume of the annular space, according to a preferred embodiment of the present invention, the degassing system storage includes several degassing tanks under low positive pressure and used for the formation of kombinirovannoye system and the system of measurement of volume. In one embodiment, provided at least two degassing tank under low positive pressure and is designed as a basic degassing tank in combination with one or more auxiliary gas tanks. Before the surgery, all tanks and associated piping systems (ending at blowout preventer) ideally should be pre-filled with clean water (referred to in this description “initial water tank”) to (a) remove the air from the system, (b) to maintain isolation of the contents of the annular space from the atmosphere and (c) to monitor the volume of gas emitted.

Preferably, three tank must be applied in order to accommodate the anticipated gas contained in the reservoir-the reservoir at the field, Cooper basin (Cooper Basin), and these tanks should have an identical configuration to simplify the design, certification, manufacture and installation in the field. For other geological provinces may require smaller and more tanks. For a better understanding of the context of the present invention, and as will be noted below, the tanks must have, as a rule, the capacity is not more than approximately 400 barrel� (63,2 m 3)(18 feet high x 12 feet wide) (5,4864 m tall × 3,6576 m wide) each, and shall be connected in series for providing a conduit for hydraulic connection of the requested type.

In a preferred petroleum Cooper basin (Cooper Basin) form three degassing tank under low positive pressure, are divided into primary degassing reservoir that is used in combination with two auxiliary gas tanks.

• Main degassing reservoir is a reservoir, which is the initial entry for the volume of drilling mud in the annular space. Main degassing the tank must be large enough so that it could accommodate theoretically maximum possible volume of the annular space (including fragments of drill cuttings and a number of captured gas), and is the place where there is a further release of gas (desorption) from the wreckage of drill cuttings. This sequence of events on the pressure side corresponds to the deepest (or in the case of horizontal drilling - the longest) unconventional gas wells such as those drilled in geological provinces, such as the field, Cooper basin (Cooper Basin). At the head of�Arsenii diversion volume in the annular space, basically degassing tank should not be any significant amount of gas, while the reservoir remains filled mostly mud (including fragments of drill cuttings), while maintaining a relatively small initial volume of water accumulated in the upper part of the tank. Observation tube on the main degassing tank allows you to monitor the level of “drilling mud/water”, although this may be complicated in case there is a significant mixing. Even if this is not possible, an observation tube allows confirmation that the primary tank is filled with water before testing.

• Auxiliary gas tanks are tanks that are best suited for hydraulic connection with the main degassing tank and serve to collect all the gas released from the primary degassing tank. It is preferable to have two of these two auxiliary gas tanks connected in series, in order to accommodate the large volumes of gas, estimated, for example, at the field, Cooper basin (Cooper Basin). In the most desirable case, auxiliary gas tanks have the following two main especially�of the job.

1. Combined occupancy, allowing for up theoretically maximum possible volume of gas. On the field, Cooper basin (Cooper Basin), this variant corresponds powerful deep coal seam with high gas content, allowing drilling at high speed.

2. Observation tube allow the measurement of the Total gas content in collected from the well volume of drilling mud in the annular space.

However, in this case, there may be a tendency for the loss of a certain amount of gas emitted by dissolving in the initial water in the tank. This applies mostly to carbon dioxide, which has a high solubility in water at temperatures less than 80°C, while methane and other hydrocarbon gases also have a sufficiently high solubility in water, but slightly lower solubility than carbon dioxide. Needless to say, that in the case of methane solubility in water decreases (at constant pressure) to a minimum at a temperature of approximately 80°C, but then increases due to changes in the mechanism of reactions in solution.

Can also be undertaken following preventive measures to eliminate or reduce the trend of loss of a certain amount of the evolved gas, which� is lost during the initial dissolution in water in the tank.

1. Installation of heating units in all the tanks degassing storage system to increase the temperature of the contents of at least 80°C. This leads to a reduction of the solubility of carbon dioxide and hydrocarbon gas to a negligibly small levels, thereby leading to the release of these gases from the solution and the maximum yield of product, and also the accuracy of the composition of the gas released from solution, which is formed in the free space left over product in the tank. This temperature shall be maintained during the time of carrying out the method of the present invention to prevent the ingress of gas into a solution of free space to leave above the product in the tank.

2. Preliminary saturation initial unheated water in the tank with carbon dioxide and hydrocarbon gases. It also slows down the loss of gas released into the solution, which leads to greater reliability in relation to the volume of gas in the free space left over product in the tank, and composition. However, in this alternative embodiment should not be applied to subsequent heating to prevent given the excess gas in the free space left over product in the tank.

Preferably, all of the pools was� hydraulically connected in series with the use of pipelines, the size of which allows the transfer of gas and water by displacement, given the fact that fragments of drilled solids in the drilling mud does not pass by the main degassing tank, where their deposition. In one embodiment of the present invention, the inlet port of the main degassing tank is connected with a standard nipple bypass line nipple manifold with standard pipeline to provide access to standard nipple line on the blowout preventer.

Also it should be clear that the outlet of the last auxiliary gas tank preferably also communicates with the atmosphere through the discharge siphon device, located downstream to prevent drawdown of the hydrostatic column in the whole range of tanks. In this respect, the initial exposure of the water in the tank is exposed to the atmosphere is an important factor, as it allows the displacement of the initial water in the tank as gas evolution. No leakage of gas from the tanks can't happen, as the initial water in the tank forms a physical barrier.

The presence bit siphon device, located downstream, and the need for access to the atmosphere�Ferre, and, as mentioned above, the filling of water in an optimal way all of the above tanks before application allows you to monitor the volume of released gas through the observation tubes. Of course, preferable is the absence of any air in the system, because in the end, this air will be subjected to measurement in addition to the evolved gas and erroneously included in the Total amount of gas.

Again referring to the preferred embodiment of the present invention, it should be noted that after drilling in the measurement interval, the detection of the front edge on the surface and subsequent closing of the blowout preventer is pumping the same volume of drilling mud (including fragments of drill cuttings and gas) in the nipple nipple line through a bypass line nipple manifold and main degassing tank. Thus there is the initial displacement of water from the main drainage of the tank as you fill it drilling fluid in the volume of the annular space. Due to the design, a certain amount of water (equivalent to the total volume of the primary degassing tank minus the volume of drilling mud and drill cuttings debris) will remain stuck in the top of the main degases�ssion of the tank. This allows you to ensure that drilling mud or debris drill cuttings were not received in the auxiliary gas tanks that are designed solely for this purpose. In the case presbitero income mud or debris drill cuttings, the measuring method according to the present invention will be reliable as long as there is enough space to capture the Total volume of gas.

Over a period of time, which obviously will be different for different geological resources and gas deposits, but may vary from several days to several weeks, continues desorption of gas from the wreckage of drill cuttings mainly degassing vessel and the flow of the auxiliary gas tanks. Current control of increasing the volume of gas depending on time can be achieved using the observation tube and the final volume can be determined after the termination of the increase in gas volume.

Depending on the required accuracy may need the application of a number of amendments, both positive and negative, for the volume of gas physically measured in the auxiliary gas tanks.

Then the Total amount of gas in-situ can be calculated put�m division final gas volume by weight (preferably dry weight) of drill cuttings debris in the volume of the annular space, moreover, these fragments of drilled solids are precipitated and dried fragments mostly degassing tank, and the Total volume of gas in-situ indicate usually in units such as standard cubic feet short ton “dry” (1 cubic foot = 0,028 m3, 1 short ton = 907,19 kg). It goes without saying that it is preferable to report the Total volume of gas based on the “dry state”. In this respect, unlike traditional reservoir, where the gas content in the form of “concentration” is indicated in percent by volume of the pore space of rocks, the gas content in the form of “concentration” in unconventional reservoirs is commonly referred to as the volume of gas per unit weight of rock, representing standard cubic foot per short ton, as indicated above.

After drilling in the measurement interval, the richness of the breed (in this case in the form of small fragments of drill cuttings) undergoes an irreversible change and is maintained in a state of flux for the remainder of the process. On the surface of the drill cuttings debris there is also free water, and that is something that should be avoided at the stage of weighing. Consistent reporting on the Total amount of gas relative to the dry weight of the drill cuttings debris on�it possible to standardize the measurement of Total gas and allows a reliable comparison between the different phases of testing.

The present invention has various advantages as compared with several known methods of measurement. For example, the standard process for desorption of a core extracted from rocks with very low permeability, it may take several months, at the time, as it is assumed that due to a much smaller fragments of drill cuttings with a greater surface area, degassing according to the method of the present invention can be completed within significantly less time as possible within a time period of less than one week.

In addition, the composition of the bulk gas is usually not available when the desorption of the standard core due to the fact that the volumes of gas are usually subjected to the measurement, analysis and rejection in the desorption process. In rare cases, to measure the volumetric composition of the gas recombine hitch. However, the method according to the present invention is optimally suited for measuring the volumetric composition of the gas, since the entire volume of gas is trapped in conditions of equilibrium.

In addition, the present invention is optimally suited for use in case recementing or naturally fractured rocks, which are prone to damage during coring, low core recovery. The present invention allows obespechitelnoj of the total rock volume, which was obtained during drilling or was produced as a result of the caving of the borehole wall, in the main degassing tank, and also provides a quantitative determination of the content of associated gas. Upon completion of degassing the weight of the solid is determined by cleaning, drying and weighing of particulate matter deposited on the bottom of the main degassing tank.

Also according to the present invention is not required to make any expensive operation of lowering and lifting of the drill pipe is greatly reduced downtime rig before or after work. The method is simple temporal redirection system of drilling fluid circulation, while continuing drilling of the well. In addition, the method does not require the placement of any additional equipment within the wellbore. All the necessary tools are on the surface, to avoid any possibility of failures or jamming in the bottom of a well.

BRIEF description of the DRAWINGS

Below is described the preferred embodiment of the present invention, some aspects of which are illustrated in the accompanying drawings, which show:

Fig.1 is a schematic view of a boring machine and system of circulation of drilling mud used in a preferred embodiment of�of westline of the present invention;

Fig.2 - schematic view of the degassing system storage used in a preferred embodiment of the present invention shown in Fig.1.

A DETAILED DESCRIPTION of the INVENTION

Fig.1 shows a drilling machine 10 of conventional type, which may be adapted for use according to the present invention. Drilling machine 10 may be suitably connected to a degassing system for storage, which is shown in Fig.2, as will be explained below. However, before describing this compound and a description of the method of the present invention according to this embodiment is given a brief explanation of the component parts of the drilling machine 10.

Drilling machine 10 shown in Fig.1, includes the traditional system of drilling fluid circulation, made with the use of various units such as tanks 12 for storage, vibrating sieves 14, suction line 16 of the mud pump 18 and motor 20. Piping system for these parts are made in the form of vibration of the hose 22, the riser 26, hose swivel 28, and ends with the collar 30. This pipe system plus swivel or top drive to insert to drive the lead pipe 48, is normally maintained with the help of tackle block 32, is suspended with the help of tackle Kang�34 of the crown block 36 on the rig 38. The force for lifting and lowering tackle block 32 with the use of tackle rope 34 is provided by means of winches 24. Using the rig 38 are also supported platform for derrickman 40, candle drill pipe 42 and the pipe rack 44. The rotary table 50 is driven by means of motor 20) to rotate drive the lead pipe 48, and then the column of drill pipe 60, is on the floor 52 of the rig, with a device consisting of a tube with a funnel and a blowout preventer, wherein the pipe with funnel indicated at 54, the annular blowout preventer preventer indicated at 56 and pipe dies and blank dies indicated at 58. Moreover, the column of drill pipe 60 shown below casing head 64, and the drill bit 62 is shown schematically in the bottom hole.

As for the normal recirculating flow path of the drilling fluid, the discharge line 66 i.e. line emission, indicates the flow path of the drilling fluid (vibratory sieves 14 and tank 12 for storing drilling mud) during normal drilling operation, thereby creating a system of circulation of drilling mud. With regard to the designated flow path of the drilling fluid during operation of the measurement system according to the present invention, it is not shown schematically in Fig.1, but in one in�the Rianta this may be a discharge line, i.e. a disposal line, which runs between the blowout preventer, nipple through the manifold, to a degassing system storage (shown in Fig.2).

However, in a preferred embodiment may be applied instead of the recirculating drilling mud fresh drilling fluid, such as gas drilling, not containing solid solution phase, which may be a gelled salt solution of NaCl up to a concentration of 9.9 pounds per gallon (4,49 kg 4,546 l) and specially prepared in a separate location from tank 12 for storing drilling mud (Fig.1) for use in drilling in the interval.

Fig.2 shows a degassing of the storage system according to a preferred embodiment of the present invention as applied to the field, Cooper basin (Cooper Basin), which will be described in General terms below. As for the degassing system, in this embodiment, it includes three degassing tank under a low positive pressure in the primary degassing reservoir 70 and two auxiliary gas tanks 72 (but in Fig.2 shows only one auxiliary gas tank). All three reservoirs are reservoirs that are made to special order, have a volume of 400 barrels(63,2 m 3), a height of 18 feet (5,4864 m) and a width of 12 feet (3,6576 m) and connected in series with pressure (discharge) piping 74 to provide between them the required hydraulic connections, and these tanks are preferably made of such reactive materials, such as aluminum, which can react either with the initial water in the tank or drilling fluid with the formation of gases such as hydrogen.

Main degassing tank 70 is the first point of receipt of the volume of drilling fluid provided at the inlet valve 76 three is marked by the arrows A, B and C, representing the separated gas A, the drilling fluid B and the wreckage of drill cuttings C marking arrows (together with the initial marking for water D in the tank), also represented in the contents of the tanks 70, 72, pressure (discharge) piping 74 and the observation tubes 78a and 78b of the tanks 70, 72. As indicated above, the primary degassing tank 70 is large enough to fit theoretically maximum possible volume of drilling mud in the annular space (including fragments of drill cuttings and a certain amount of trapped gas), and is the place where there is an allocation of gas (“desorption”) from the wreckage of drill cuttings � a long period of time.

Upon completion of the discharge volume of the annular space (which is a stage of the process, presented in outline in Fig.2), mainly in the degassing tank should not be any significant amount of gas, except for a minor amount of gas A1shown in the free space left on a product at the top of the tank 70 and the reservoir 70 is filled mostly mud B1(including fragments of drill cuttings C1), with a relatively small initial water volume (D1accumulated in the upper part of the tank 70. Observation tube 78a on the main degassing tank 70 allows the monitoring of the level of drilling mud/water.

Auxiliary gas tank 72 is shown in hydraulic connection with the main degassing reservoir 70 and serves to collect all the gas A1released from the primary degassing reservoir 70 and observation tube 78b allows the measurement of the Total volume of gas collected from the well volume of drilling mud in the annular space. As mentioned above, it is preferred to use at least two of these auxiliary gas tanks 72 connected in series to the VM�should the large volumes of gas, alleged, for example, at the field, Cooper basin (Cooper Basin), Thus, in this embodiment of the present invention, the auxiliary gas tanks are those tanks, which together collect all the gas A2released from the primary degassing tank 70.

All the tanks 70, 72, and the whole system interconnections in front of the outlet of the last auxiliary gas tank and ending at

blowout preventer, pre-filled with clean water and are hydraulically connected in series by means of conduit 74 having a size sufficient to allow pumping of both gas and water by displacement, thus fragments of drilled solids in the drilling mud has not gone beyond the primary degassing tank 70, where they are deposited (Fig. 2 is shown as C1). Both tanks 70, 72, as shown, have the exhaust hole 79, manholes for cleaning 81, an outlet hole 83 for the suction of liquids and safety of the hinged cover 85.

The outlet 80 of the last auxiliary reservoir (reservoir 72 in Fig.2) communicates with the atmosphere through the discharge siphon device 82 that is located to prevent� " s gravitational drainage hydrostatic pressure in the entire system of reservoirs. Needless to say that the initial exposure to water, D in the tank exposed to the atmosphere is important, as it allows water displacement D as allocation of gas A. a Gas cannot stand out from the tanks 70, 72, as the water D forms a physical barrier.

Below is a stepwise description of the method with reference to a preferred embodiment of the present invention, illustrated in the drawings (but without showing all item numbers).

Stage 1

Carry out drilling in the normal mode to the zone, subject to evaluation and, more specifically, before the start of the measurement interval.

Stage 2

Stop drilling at the point determined by the length of the leading drill pipe, if possible, and this point is the point to which was produced by drilling through one section of drill pipe at its maximum length, and before resuming drilling must be connected a new section of pipe. This allows to minimize the number of pipe joints carried out during drilling in the area of interest, but it must be borne in mind that the pipe connections have a number of direct impacts. For example, it may be caused by the inflow of gas into the well at the expense of “swabbing” (the sample is swabbed) in the borehole as a result, the effect� suction, occurs when the elevation of the bottom node of the column of drill pipe above the bottom. It allows you to enter a positive error in the ratio of the final Total volume of gas. If the connection cannot be avoided, then move the node to the bottom of the column of drill pipe must be carried out as slowly as possible, thereby reducing to a minimum the pressure pulsation in the well.

In addition, the downtime associated with the joints of pipes, increases the possibility of gas flow up ahead of the front edge of the volume of the annular space and found the first fragments of drill cuttings in the annular space, thereby increasing the possibility of leakage of gas into the atmosphere before the closing of the blowout preventer. In addition, for about 2-3 minutes to circulate drilling mud, while not drilling rock formation thereby “free space”, containing fragments of drill cuttings or gas.

Immediately after the cessation of drilling shall be confirmed by the lithology of the rocks at the beginning of the measurement interval using the downhole sample packs.

Step 3

Carry out the mounting of the well casing pipes before the start of the measurement interval, which can be considered as an option of choice and is highly recommended. Mount casing pipes reduces the uncertainty p�and measuring the Total volume of gas by removing some unwanted variables, such as the gas flow into the well from higher areas (or leakage), caving into the well from higher areas, and the loss of drilling fluid from the well into a higher zone (or growth).

Besides, if this was not done fixing the well casing pipes before the start of the measurement interval, it is recommended to closely monitor background gas, loss/gain, and the solids content in the drilling mud so that you can make steps to stabilize the hole before the implementation of the method. In addition, should be taken into account the impact on pre-drilled traditional production zones by increasing the density of drilling mud. In some cases, it may corrupt the traditional productive areas, if there is too great an increase in the density of the drilling fluid and, possibly, gas and debris drill cuttings to other areas, thereby leading to the occurrence of error in applying the method according to the present invention.

Carry out the installation and/or filling degassing system for storage, which according to this embodiment of the present invention is a main degassing reservoir and two auxiliary measuring tank. These tanks ideally should�s to be located on the edge of a piece of drilling, as close as possible to the drilling machine on the same side of the rig, which is located nipple manifold, and at a sufficient distance from the pit for burning gas in accordance with the standards and regulations in the country in which testing is conducted. This will minimize the impact on normal operations of drilling and fishing activities after drilling (namely, the dismantling of the drilling rig, the intensification of hydraulic fracturing, completion of wells, etc.).

The installation process/dressings applied to the degassing system storage preferably includes the following operations:

- connecting an outlet line of the main degassing tank to the return line nipple nipple manifold;

- series connection of the auxiliary gas tanks to the main degassing reservoir;

- exhaust (outlet) tubing end auxiliary gas tank must be sent to the pit for burning gas or barn for waste drilling mud;

after installing the tanks should not be any disconnection. Emissions of gas, etc. (easily found at the site with the help of these tanks) can be eliminated by poto�and through the nozzle and out of the well with the use of traditional methods of well control;

- fill all tanks and associated piping (namely, all that is up to the outlet of the last auxiliary gas tank and ends at blowout preventer) net primary water intended for vessel monitoring through observation tubes), and thus there should be no air pockets;

- (a) initial heating water in the water tank of at least 80°C and maintaining this temperature during the period of implementation of the method, or (b) saturation initial unheated water in the tank a gas mixture similar to the anticipated composition of the gas in the tank; and

- can be implemented installation of a barrier or partition mainly degassing reservoir that prevents mixing of the incoming drilling mud to the existing water.

In that case, if it has not been applied variant associated with fastening the casing pipe at depth, you should proceed to step 6.

Step 5

Exercise drill out the casing Shoe and cement in that case, if the applied variant associated with fastening the casing pipe at depth, and also marks the beginning of the measurement interval. Carry out inspection of lithology using the downhole sample packs. Continue compass�Oia drilling mud in the borehole by means of a system of circulation of drilling mud to obtain a constant low background gas concentration in the circulating drilling fluid. Takes samples of drilling mud for gas analysis in free space left over product in the tank. This volume of background gas may be deducted from the Total volume of gas, measured in subsequent degassing system for storage.

Skip to Step 7 - the mount casing pipes at a depth allows for the calculation of the exact delay of drilling fluid circulation, the inner diameter of the casing string.

Stage 6

Determine the exact delay time of drilling fluid circulation, based on the frequency of strokes of the mud pump in order to determine the moment when the front edge of the volume in the annular space reaches a blowout preventer as drilling mud performs circulation towards the surface. This definition may be as follows:

- set the location of high-viscosity painted accumulations of paint (marker) on the bottom of the well, which at this stage is the beginning of the measurement interval;

- record the meter reading frequency of the stroke of the piston mud pump;

- carry out circulation (without drilling) up until the marker reaches the surface, and detection is carried out either at the pipe with funnel, or pallet under FWS�sieve for drilling mud, either vibrating sieves. The tray under the shaker for drilling mud is a metal container at the beginning of vibrating screens that receive drilling fluid from the end of the flowlines. Its function is that it slows down the flow of drilling mud (the rate of which increases with the feed rate flowlines) to prevent it from splashing out from the vibrating sieves. Vibrating sieves are those of the sieve, which is the transmission recirculating drilling mud to separate fragments of drill cuttings from drilling mud. It does not matter which of the three locations used for the detection of the marker, because the time required to move the marker between these locations is not significant compared to the total latency. Preferred is the detection of pipe with funnel, as it is the closest place with respect to the blowout preventer, where the abstraction to a degassing system for storage;

- record the meter reading frequency of the strokes of the mud pump.

The number of strokes of the mud pump between the establishment of the precise location of the marker at the bottom of the well and the detection of the marker on the surface allows for reliable �the evaluation of the time of removal of the drill cuttings to the mouth of the well. This is important in the conditions existing at an uncased borehole, when theoretical volume of the annular space may be misleading due to the presence of erosion along the wall of the borehole. In addition, and in that case, if necessary, can be carried out standard carbide lag” (carbide lag) as a replacement for the above approach. Thus, the appearance of gas or fragments of drill cuttings on the surface will always be taken into account for (a) evaluation of painted marker and (b) estimating the time of removal of the drill cuttings to the mouth of the well in that case, when the decision on allocation of the volume of the annular space in the main degassing tank.

Step 7

Carry out fine-tuning of the drill hole to the required parameters. Drilling well before operations must have stable parameters with regard to the availability of low-background gas content and low losses/gains drilling mud and drilling mud should not contain significant amounts of particulate matter. Any solids that are already in the drilling mud to the drilling in the measurement interval will be deposited mainly in the degassing tank and cause a positive error regarding the weight of the drill cuttings debris. This PR�leads to inaccuracies in the calculation of the Total volume of gas in the direction of understatement.

Step 8

In that case, if it should not be used fresh drilling mud, additional selection exercise testing with measurement in quality control for quantitative determination of background gas recirculation. In that case, if there is any doubt as to the amount of background gas in the recirculating drilling fluid before the drilling in the measurement interval, for this quantification can be applied degassing system for storage. Unfortunately, for the separation of such gas from the circulating drilling mud requires time that may be unacceptable to the owners of wells that have a stake in the property, based on the time of drilling (to calculate commercial speed), and it will require time in order to empty the tanks and fill them again with fresh initial water in the tank for the implementation of the main method. Needless to say, it should be clear that one solution to this problem is the need to have a double set of tanks for the degassing system for storing intended for pre-test measurement. Alternatively, there may be applied a second solution to monitor, on a smaller scale, by degassing sample� drilling mud, taken from flowlines. However, this can lead to less precision due to the diversion of a certain amount of gas into the atmosphere.

However, in case reveals that the number of background gas is too large, it may simply be deducted from the volume of gas determined later.

It should be noted that the testing carried out by an additional choice is not required if the option preferred application (as stated above) system for gas and drilling mud, not containing solid particles, with the goal of providing fresh drilling mud for carrying out the method.

Step 9

Carry out drilling in the measurement interval. Immediately prior to drilling in the measurement interval set the location of high-viscosity painted the accumulation of paint on the bottom of the well, which serves to mark the start of the measurement interval to slow down the release of gas to the surface in front of the wreckage of drill cuttings, and also serves as a visible marker ahead of the front edge of the drilling mud at the surface (which is usually more reliable than the evaluation time of the removal of drill cuttings to the mouth of the well). While drilling occurs from the beginning of the measurement interval to the end of the measurement interval, realize the optimization of drilling parameters for �of stijene the highest mechanical ROP for the lowest rate of discharge or pumping. This allows you to create the highest concentration of debris drill cuttings and gas in the volume of the annular space that is formed during drilling.

Stop drilling and carry out measurement of the depth of the well above the bottom, once the marker reaches the surface. The time of removal of the drill cuttings to the mouth of the well is used only as a guideline for the moment when the wreckage of drill cuttings and gas is likely to appear on the surface, particularly if there is no attachment casing pipes at depth. As described above, the actual advent of gas or fragments of drill cuttings should be taken into consideration in lieu of all other indicative signs.

At this point, the annular space contains fragments of drill cuttings and associated gas in the measurement interval, distributed along the wellbore from the total depth of the well to the surface, representing a volume of the annular space, marked on the front edge.

Thus it is necessary to support the circulation of drilling mud to prevent the deposition of drill cuttings debris. In case any debris drill cuttings are moved below the drill head (which is suspended above the bottom), then their rise becomes difficult.

As soon as the front�th edge of the volume of the annular space is approaching the blowout preventer, then no delay should be made following the stage of abstraction, otherwise you will be pumping drilling mud through the blowout preventer and pipe with funnel towards the surface. In this case, the loss may occur passionate about the wreckage of drill cuttings that fall into the receiving barn for waste drilling mud, and can leak gas into the atmosphere.

Step 10

Carry out retraction of the volume of the annular space in a degassing system for storage. For discharge of the entire volume of drilling mud in the annular space in the main degassing tank, following two operations must occur simultaneously (or almost simultaneously).

1. The opening of all valves located before the main degassing reservoir and degassing tank to prevent the formation of the peak pressure in the annular space at the closure of the blowout preventer. In this case, should be provided with a continuous path of penetration of the flux into the atmosphere from the outlet nipple line through degassing system storage to the pit for burning gas or receiving barn for waste drilling mud. It should be clear that upon subsequent receipt of the content contained in the annular spaces�, in degassing system for storage, at no stage, there is no direct contact with the atmosphere. It becomes possible for the reason that the initial water in the tank forms a physical barrier. And in this case there is no gas leak.

2. Closing the blowout preventer for sealing the annular space. This leads to the disposal of drilling mud, drill cuttings debris and entrained gas through the choke line and manifold nipple in the main degassing tank.

Immediately after these two operations or simultaneously carry out the circulation of heavy accumulations of paint to the bottom of the wellbore (with marking back of the volume of annular space) in order to facilitate the lifting of the last fragments of drill cuttings. Colored marker is not required because visual monitoring difficult along the closed path of penetration of the flow, leading to the main degassing tank. Needless to say, that instead of applying a visible marker for determining income rear edge of the volume of the annular space to the surface, can be applied, the timing of the removal of drill cuttings to the mouth of the well (and thus the number of strokes of the mud pump with a delay). With this in mind, continued from�the acka system of drilling fluid circulation for one-time removal of drill cuttings to the mouth of the well.

The rear edge of the volume of the annular space at the moment should be the blowout preventer, and the entire volume of the annular space is allocated in the main degassing tank (the delay time and the amount of mud /debris drill cuttings/gas between the blowout preventer and the vessel is immaterial). The bottomhole pressure can be maintained constant during the circulation drill cuttings debris and gas to the surface by maintaining a constant pressure circulation (pressure in the riser).

At this stage the pressure in the riser and outlet of the auxiliary gas tanks should be constantly monitored at all times to detect outlier and clogging land line. After some time, when the nipple line or manifold nipple become clogged (judging by the readings of the pressure in the riser), carry out the disposal of drilling fluid in flow line equipment and attempt to resolve the blockage. Check the pressure and if necessary carry out a standard procedure well control. In that case, if the gas release occurs, as indicated by either (a) the pressure drop in the riser, or (b) the increased flow of displaced water at the outlet of the last auxiliary gas re�of ervoir, then stop testing and start to implement standard procedures well control (for example, using the driller, i.e. a method of well control with the threat of release).

At the moment when the trailing edge of the volume of the annular space is by the blowout preventer and the entire volume of the annular space allotted in the main degassing tank, shut off the mud pumps and cover the nipple line and the inlet of the main degassing tank. All valves located at the inlet of the main degassing reservoir that must remain open, thereby allowing to carry out the expansion of the gas and the initial release of water contained in the reservoir, while that is happening at the moment of the degassing process. If this is not done, there will be an increase of pressure in all the tanks, thereby slowing down the evolution of gas from the wreckage of drill cuttings and possible excess of the nominal value of the gap exhaust valves.

Make sure that the static pressure in the borehole with a closed mouth is zero, carry out inspection of the stream flowing through the nipple line before opening the blowout preventer, and implement the opening of the blowout preventer, change the direction of flow of brown�CSOs solution, sending it back on its normal path passing through the blowout preventer and pipe with funnel for flowlines to the storage tanks drilling mud.

As a result the entire drilling fluid (including fragments of drill cuttings and associated gas) in the volume of the annular space formed while drilling in the measurement interval, included into the degassing tank so that you can resume normal drilling.

Step 11

Leave the degassing tank (including the degassing tank and auxiliary gas tanks) in the position in which gas evolution occurs. When closed at the moment the inlet of the main degassing tank pipe leading to the manifold nipple, can be detached. However, as the tanks are being filled, are too heavy to transport, they should stay in place. In fact, the auxiliary gas tanks may accumulate at least 2000+ standard cubic feet (56,60 m3) of gas per short ton (1 short ton = 907,2 kg) of debris drill cuttings (in the case of coal) is basically a degassing vessel, which may lead to deposition of at least one short tons of drill cuttings debris.

�syshestvyut registration of the increasing volume of gas in the auxiliary gas tanks for strictly observe time intervals using a viewing tube on each tank. The time required for complete degassing, varies depending on the properties of the studied rocks. According to the estimate of this can vary from several days to several weeks.

Step 12

Carry out the emptying of all tanks, but leave the wreckage of drill cuttings mainly degassing tank. Collecting, drying and weighing of drill cuttings debris that accumulated on the bottom of the main degassing tank, allow the calculation of the Total volume of gas on the weight of the rocks associated with the gas, and expressed in units such as standard cubic feet per ton of “dry weight” (1 standard cubic foot = 0,028 m3).

Carry out a controlled release of gas from all tanks in the atmosphere, plums of all drilling mud degassing from the main tank through the drain hole for the suction of liquids, drain the primary water from the auxiliary gas tanks, and shall remove all debris drill cuttings from the primary degassing tank, placing the wreckage of drill cuttings in a suitable container (for example, “mini-container”) for rinsing with water to remove all foreign material (in particular, barite, which has high density and is associated with mud). In this respect, if in CA�ETS drilling mud was applied to a preferred embodiment in the form of fresh drilling mud, representing a drilling fluid with a gas not containing the solid phase, will require only minimal washing drill cuttings debris.

After emptying the tanks can be moved to the next well location for re-use.

Stage 13

Before drying is carried out sampling of drill cuttings debris for residual gas analysis. Taken from samples of drill cuttings debris small sample for analysis and sent to the lab involved in the desorption core samples for analysis for the presence of residual gas. This analysis allows a quantitative determination of small amounts of residual gas that has not been previously allocated (standard procedure for conventional desorption core). To save the sample during transport should apply ice.

Step 14

Before drying is carried out sampling of drill cuttings debris to conduct other tests. In respect of degassed fragments of drill cuttings can be carried out a number of important tests, such as adsorption analysis, approximate analysis, analysis to determine Total organic carbon analysis by using the analyzer RockEval, analysis to determine porosity, permeability, density, skaniruesh�I electron microscopy, radiography and maternally analysis, etc., to obtain a small sample for analysis as required.

Stage 15

Accurately recording the total dry weight of the wreckage of the drill cuttings. After the selection of a small sub-samples for analysis, perform a thorough drying of the wreckage of the drill cuttings and then move these pieces of drill cuttings in an appropriate container for weighing.

Stage 16 - the Last stage

Perform calculation of Total gas in-situ for the interval of measurement. The calculation of Total gas in-situ can be carried out by dividing the volume of gas measured by the method according to the present invention (for the volume of the annular space on the dry weight of the wreckage of the drill cuttings in the volume of the annular space. Total gas in-situ can then be expressed in units such as standard cubic feet per ton of “dry weight” (1 standard cubic foot = 0,028 m3). Can be applied amendments as required (for example, adding a residual gas drilled in the rock fragments to the volume of gas measured in the tanks), and rationing, as required (for example, the conversion to “dry ash-free mass” in the case of coal).

It should be noted also that in respect of the weight of the wreckage of the drill cuttings can be carried out “audits� in real conditions using standard measurements by electrical logging with the use of cavernoma to calculate the volume of the well, formed in the measurement interval. The weight of the wreckage of the drill cuttings can be determined using the density of the debris of drill cuttings collected from the primary degassing tank.

In addition, it should be clear that depending on the accuracy you may need the application of a number of amendments, both positive and negative, in relation to the volume of gas physically measured in the auxiliary gas tanks.

Based on the preferred and optimum technical requirements for tanks used in degassing storage system, the primary degassing tank should be large enough in case of scenarios on the pressure side for the anticipated volume of the annular space. It is a function of (a) the diameter of the borehole/casing and (b) the depth to the measurement interval. For example, for deposits of the basin Cooper (Cooper Basin) it is assumed that the volume of the annular space on the pressure side should be set at 350 barrels (55,3 m3), based on theoretical value of the volume of the annular space on the discharge side of which is 324 of the barrel (54,036 m3). This theoretical value equals the total volume of the annular space that is associated with the deepest, sameraatal, unconventional vertical gas wells at the field, Cooper basin with a standard diameter barrel with758”inch (19,3675 cm) conductor casing to approximately 3000 feet (914,40 m), and634”inch (17,145 cm) portion of the wellbore, loose casing pipes, up to 10,000 feet (3048 m). In the range from 3,000 feet to 10,000 feet (from 914,40 to 3048 m) volume of the annular space formed by312”-inch (8.89 cm) drill pipe and334”inch (12,065 cm) heavy-weight drill pipe in the wellbore, not fixed casing pipes.

In the case of such in boreholes has been a constant deviation from the prescribed size by approximately 10%, and consequently the volume of the annular space on the pressure side becomes equal to 350 barrels (55,3 m3). Nevertheless, the wellbore with a significant deviation from the prescribed size is not necessarily an exhaust gas�anywaysi factor for this method, it should be clear that there is no requirement for full (completely accurate) the volume of the annular space from which to conduct the sampling. In fact, in the case where the main degassing vessel is nearly completely filled, that is contained in the annular space, it should be clear that the process of abstraction can be finished by closing the blowout preventer.

In addition, theoretical maximum volume of drill cuttings debris collected in the annulus during drilling in the measurement interval and then assigned in the main degassing reservoir within the volume of the annular space, is a function of (a) the diameter of the wellbore, (b) mechanical ROP and (c) the delay time of circulation of the drilling fluid from the well bottom to the surface.

Based on the time of removal of the drill cuttings to the mouth of the well of approximately 40 minutes at a depth of 10,000 ft (3048 m), and high mechanical ROP, component of 0.5 minutes per foot (1 ft = 0,3048 m)(a scenario for deeply buried coal seams), carry out drilling634”inch (17,145 cm) borehole depth of 80 feet (24,384 m). This leads to the obra�the stripes approximately 0,6 cubic meters of rubble drill cuttings in the case of wells normal [nominal] diameter. If the well has a cavity, it can be significantly more fragments bit cuttings, but it does not create problems, since on the surface, the capture and measurement of everything that has been obtained during drilling.

It is unlikely that additional (formed as a result of the collapse) fragments of drill cuttings will lead to the outflow of drilling fluid contained in the degassing tank, the attached auxiliary gas tank. This is unlikely for the reason that the volume proportion of fragments drill cuttings mainly in the degassing tank is initially more or less negligible (4 bbl 400 barrels (0,632 at 63.2 m3) or 1%), and in this tank there are at least 46 barrels (7,268 m3) volume nevelesanas water in the tank that can accommodate a significantly larger number. Collapse, provided that they occur only in the intervals of measurement are actually positive outcome. The resulting higher concentration of drill cuttings debris and gas in the annular space leads to more reliable measurement of Total gas in the degassing storage system.

If the displacement volume of the annular space on the pressure side in the main deg�post the reservoir, pre-filled with water and having a capacity of 400 barrels (63,2 m3)(the tank with a height of 18 feet (5,4864 m) and a width of 12 feet (3,6576 m)), the various components are separated fluids and solids, ranging in height are the following.

The gas in the free space above the product in the tank = negligibly small value gas is continuously displaced in the space to leave above the product in the auxiliary gas tanks).

Accumulated water = 1.8 ft (0,5486 m)(46 barrels)(7,268 m3).

Drilling mud = 16 feet (4,876 m) (350 barrels)(55,3 m3)

The wreckage of drill cuttings = 0.2 ft (0.06 m)(4 barrel)(0,632 m3).

The volume of drill cuttings debris (0,6 cubic meter) is equal to about 0.9 short tons (816,48 kg) breed on the basis of the bulk density of conventional coal approximately 1.3 grams per cubic centimeter (or metric tons per cubic meter).

Auxiliary gas tank must have a common capacity, allowing for up theoretically maximum possible volume of gas generated in the main degassing tank. To estimate the volume of gas on the pressure side in the first place must be found in the proof of the existence of gas content on the pressure side. This is achieved �UTEM research on anomalous desorption, implemented at the deeply buried coal seam deposits of the basin Cooper (Cooper Basin), which carried out according to the evaluation of the content of the Total volume of in situ gas amounted to about 2000 standard cubic feet/ton (56,60 m3/tonne)(“ash-free dry mass”) - albeit with a high degree of uncertainty. Provided that the primary degassing reservoir may contain 0.9 short tons (816,48 kg) fragments of coal (or more), this represents a volume of gas on the discharge side of about 1900 standard cubic meters (53,8 m3)(approximately 340 barrels).

A practical limit to the size of any of the tanks is 400 barrels (63,2 m3). Given the large volumes of gas generated by caving (almost dominant in coal seams), two tanks of this size should be connected in series. This allows you to create additional high capacity, thereby ensuring that even if a piece of the borehole volume of gas greater than the estimated amount of gas, in any case will not replace all of the initial water from the tanks.

The person skilled in the art will understand that other variations and modifications other than those described. It should be clear that the present invention includes all such variations and modifications. To �WMD same the present invention includes all stages, features, compositions and compounds referred to or indicated in this description, separately or together, and also includes all combinations of any two or more stages or distinctive features.

1. The way of measuring in-situ the Total volume of gas in unconventional reservoir rock, comprising the following operations:
(a) drilling wells in the measurement interval in the reservoir-the reservoir for the formation of the drilling fluid in the volume of the annular space, which contains fragments of drill cuttings and gas, the volume of the annular space has a front edge and rear edge,
(b) disposal of the front edge of the volume of the annular space thus to capture the entire volume of the annular space in a degassing system for storage without exposure to the atmosphere,
(c) termination of assignment of the volume of the annular space after catching the front edge of the volume of the annular space in the degassing system to store,
d) measuring the volume of gas in the degassing system for storage for the purpose of determining the amount of gas in the calculation of the volume of the annular space, and
e) calculating in-situ Total gas volume in the reservoir-the reservoir based on the amount of gas and debris drill cuttings in the calculation of the volume of the annular space.

2. A method according to claim 1, in Kotor�m used drilling machine, including a system of circulation of the drilling fluid and the blowout preventer, which occurs through the recirculation of drilling mud from the wellbore and into the wellbore during normal operations of drilling.

3. A method according to claim 2, wherein simultaneously close the blowout preventer and open the valve located behind the blowout preventer, providing the possibility of diverting the leading edge of the volume of the annular space, thus shall capture the entire volume of the annular space in a degassing system for storage without exposure to the atmosphere.

4. A method according to claim 2, wherein in the case of catching the front edge of the volume of the annular space in a degassing system for storing carry out the simultaneous opening of the blowout preventer and closing valves located at the blowout preventer, culminating in the degassing system for storing, stopping retraction of the volume of the annular space.

5. A method according to claim 1, wherein the deposition is carried out caught in a degassing system for storing fragments of drilled solids in the slurry, and degassed drilling mud for some period of time.

6. A method according to claim 5, wherein the degassing system storage includes several degasation�tion tanks, under low positive pressure and used for the formation of a combined system for deposition and measurements of volume, and degassing tanks are initially filled with clean water for discharge of the volume of the annular space, each of which is initially free space left over product in the tank and intended for the accumulation of gas.

7. A method according to claim 6, wherein apply at least two degassing tank under low positive pressure and is designed as a basic degassing reservoir that is combined together with one or more gas-tank.

8. A method according to claim 7, wherein the auxiliary gas tanks connected in series and provide the hydraulic connection with the main degassing reservoir for collecting virtually all gas extracted from the primary degassing tank.

9. A method according to claim 7, wherein the auxiliary gas tanks include the observation tube for enabling the tracking of the volume of gas emitted.

10. A method according to claim 7, wherein upon completion of the process of abstraction of the volume of the annular space and subsequent degassing mainly degassing vessel remains Zn�significant amount of gas, when this space is filled with mostly mud and debris from drill cuttings and only a relatively minor amount of water remaining in the upper part of the tank.

11. A method according to claim 7, wherein the outlet of the last auxiliary gas tank report with the atmosphere through a discharge siphon device to prevent discharge by gravity drainage system for storing the initial exposure of the water in the tank is exposed to the atmosphere for the displacement of water as the discharge gas.

12. A method according to claim 7, wherein the initial water in the tank is subjected to a preliminary saturation of dissolved gas model structure to prevent leakage of released gas into the solution.

13. A method according to claim 7, wherein the initial water in the tank is heated to a temperature of at least 80°C to reduce the solubility of carbon dioxide and hydrocarbon gas to a negligibly small levels, thus contributing to the allocation of these gases from the solution.

14. A method according to claim 1, in which the drilling mud used fresh drilling mud in the form of aerated drilling mud, containing a solid phase.

15. The way of measuring in-situ the Total volume of gas in unconventional reservoir rock, which is used mill drill�to, including a system of circulation of the drilling fluid containing the blowout preventer, which occurs through the recirculation of drilling mud from the wellbore and into the wellbore during normal operation of drilling, comprising the following operations:
(a) drilling wells in the measurement interval in the reservoir-the reservoir for the formation of the volume of drilling mud in the annular space, which contains fragments of drill cuttings and gas, the volume of the annular space has a front edge and rear edge,
(b) simultaneous closing of the blowout preventer and the opening of all valves located at the blowout preventer for diverting the leading edge of the volume of the annular space thus to capture the entire volume of the annular space in a degassing system for storage without exposure to the atmosphere,
(c) after catching the front edge of the volume of the annular space in a degassing system for storing the simultaneous opening of the blowout preventer and valves located at the blowout preventer, which terminates in a degassing system for storage, to interrupt the discharge of the volume of the annular space,
d) measuring the volume of gas in the degassing storage system for the purpose of determining the number�TWA gas in the calculation of the volume of the annular space, and
e) calculating in-situ Total gas volume in the reservoir-the reservoir based on the amount of gas and debris drill cuttings in the calculation of the volume of the annular space.

16. A device for measuring in situ the Total volume of gas in unconventional reservoir rock, including:
(a) drilling machine, is arranged to carry out the drilling of the well in the range of measurement in gas-bearing reservoir-the reservoir for the formation of the volume of drilling mud in the annular space, which contains fragments of drill cuttings and gas, and the volume of the annular space has a front edge and a rear edge, and
(b) degassing system for storage, made to capture the entire volume of the annular space without exposure to the atmosphere at the time when the front edge abstraction volume of drilling mud in the annular space, to the interruption of the discharge of the following capture the leading edge of the volume of the annular space in a degassing system for storing and providing means of this measure the volume of gas in the degassing system for storage for the purpose of determining the amount of gas in the calculation of the volume of the annular space and the calculation of Total gas in-situ in the gas-bearing reservoir-the reservoir with respect to the quantity of gas and debris drill cuttings in the calculation about�eat annular space.

17. The device according to claim 16, including a system of circulation of drilling mud containing a blowout preventer adapted to the implementation of recycling drilling mud from the wellbore and into the wellbore during normal operation of drilling.

18. The device according to claim 17, arranged to discharge the front edge of the volume of the annular space in a degassing system for storage by simultaneous closure of the blowout preventer and the opening of all the valves located at the blowout preventer.

19. The device according to claim 17, arranged to discharge the volume of the annular space in a degassing system for storage due to the simultaneous opening of the blowout preventer and closing valves located at the blowout preventer, which terminates in a degassing system for storage.

20. The device according to claim 16, in which degassing of the storage system includes a number of degassing tanks under low positive pressure and used for the formation of a combined sedimentation and measure the volume.

21. The device according to claim 20, comprising at least two degassing tank under low positive pressure and is designed as a basic degassing RES�of rvoir, combined together with one or more auxiliary gas tanks.

22. The device according to claim 21, in which the auxiliary gas tanks connected in series and have a hydraulic connection with the main degassing reservoir for collecting all the gas extracted from the primary degassing tank.

23. The device according to claim 21, in which the auxiliary gas tanks include the observation tube for enabling the tracking of the volume of gas emitted.

24. The device according to claim 21, in which the outlet of the last auxiliary gas tank communicates with the atmosphere through the discharge siphon device to prevent discharge by gravity drainage system for storage.

25. A device for measuring in situ the Total volume of gas in unconventional reservoir rock, including
(a) drilling machine containing the system of circulation of the drilling fluid, which includes a blowout preventer, which is recirculated from the wellbore and into the wellbore during normal operations of drilling, with drilling machine is arranged to carry out the drilling of a borehole in the range of measurement in gas-bearing reservoir-the reservoir for the formation of the volume of drilling mud in kolicevo� space, which contains fragments of drill cuttings and gas, and the volume of the annular space has a front edge and a rear edge, and
(b) degassing system for storage, made to capture the entire volume of the annular space without exposure to the impact of the atmosphere at a time when there is an abstraction of the front edge of the volume of drilling mud in the annular space in this degassing system storage is carried out by simultaneous closure of the blowout preventer and the opening of all the valves located at the blowout preventer, wherein the discharge is interrupted after the capture of the front edge of the volume of the annular space in a degassing system for storage by simultaneous opening of the blowout preventer and closing valves located at the blowout preventer, which terminates in a degassing system for storage, whereby the volume of gas in the degassing system storage can be measured to determine the amount of gas in the calculation of the volume of the annular space, and the Total volume of gas in-situ in the gas-bearing reservoir-the reservoir can be calculated from the quantities of gas and debris drill cuttings in the calculation of the volume of the annular space.



 

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FIELD: oil-and-gas industry.

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20 cl, 5 dwg

FIELD: instrumentation.

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26 cl, 6 dwg

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FIELD: oil and gas industry.

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25 cl, 15 dwg

FIELD: machine building.

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4 dwg

FIELD: oil and gas industry.

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1 ex, 2 tbl, 1 dwg

FIELD: oil and gas industry.

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3 dwg, 9 cl

FIELD: oil and gas industry.

SUBSTANCE: in process of sampling, values of specific electric conductivity are measured on liquid arriving into a sampling chamber. At the same time measured values of specific electric conductivity and readings of pressure and temperature sensors are recorded with a surface receiving-processing station, and to form a channel of communication with it and to provide for sampler lowering and lifting, an armoured geophysical cable is used, which is withdrawn from a drilling string via a sealing device. Besides, before opening of a potentially producing bed, the sampler at the vibration and impact safe distance from a bit is fixed on the cable in the above-packer space of the above-bit packering unit, providing for direct circulation of the mud. And after opening the sampling operation is carried out by means of multiple sampling and remote express-analysis of fluid composition in every sample according to specific electric conductivity, for this purpose the chamber by means of piston displacement is released from the first sample with fluid discharge into the above-packer space. Then it is put into the initial working condition, and similarly to the first sample taking, further sampling is carried out, until extremum of specific electric conductivity values is achieved, and on the basis of this parameter, a decision is made to lift the last sample from the well or to continue drilling process, and bed parameters are identified on the basis of pressure, temperature sensor readings, and by the value and speed of increments of specific electric conductivity.

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8 cl, 6 dwg

FIELD: oil and gas extractive industry.

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EFFECT: higher reliability.

6 cl, 14 dwg

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