Treatment method of bottom-hole formation zone, and device for its implementation

FIELD: oil and gas industry.

SUBSTANCE: excess pressure is created in the well by acting on the formation with gaseous combustion products of frameless cylindrical solid-fuel charge having igniter, central round channel and solid-fuel segments projecting on opposite cylindrical surfaces parallel to axis of central channel, with longitudinal slots made in them for the rope of the assembly device, and the distance between slots, which is equal to outer diameter of cylindrical part of charge. According to the invention, excess pressure controlled as to amplitude and duration is created in the well without deformation and fracture of charge, which is caused with excess critical pressure of combustion products in cavity of its channel relative to the charge environment. It is achieved by installation opposite the formation or near the formation of charge with through central round channel having the ratio of channel length to its diameter, which is equal to (22-38):1. Increase in duration of action on formation at decreased pressure is achieved by attachment to that charge of additional cylindrical solid-fuel charge with similar projecting segments with slots and its length-to-diameter ratio equal to (5-15):1 with straight end faces or with a groove on the end face. At that, ignition of additional charge in the well is performed from igniter of lower charge with through channel or from igniters of charges with through channels, which are located from above or from below of additional charge. Current supply wires from geophysical cable to igniter are passed through the channel or longitudinal slots of segments of charge having a through channel, and longitudinal slots of segments of additional charge.

EFFECT: increasing treatment efficiency.

2 cl, 2 dwg

 

The invention relates to oil and gas production, namely termoliticheskogo the method of processing bottom-hole formation zone (PPP) and the device with which it is performed.

The most effective present invention can be used to increase productivity contaminated in the process of exploitation of oil and gas production and injection wells, as well as low and wells, including deposits of heavy oil fractions. It is suitable for resuscitation of old wells.

In addition, the invention can be successfully used for the degassing of coal seams, including for commercial production of methane for the production of solid minerals leaching, as well as to increase the productivity of water wells.

The method and the device are implemented using solid-propellant charges, made of energetic condensed systems - ballistic missile and artillery powders or mixed solid fuels. The device is collected with the help of special equipment.

Charges connected to the logging cable, is lowered into the borehole in the processing interval of the productive formation or near it. After ignition of the charge current by cable and their subsequent combustion occur termoliticheskogo, including Bari is a mini impact.

Termoliticheskogo impact on the PPP leads to the appearance of longitudinal and transverse cracks, expansion of existing channels and other changes in rocks, as well as favorable from the point of view of increasing hydrocarbon production changes the properties of the ingredients.

When significant pressure effects of these processes are enhanced. In extreme cases (when the excess pressure from the combustion charge is 1.5 to 3 times compared to the mountain pressure) occurs "hot" the fracturing of the PPP and additionally appear long trunk lines.

To broaden and deepen cracks and channels, reduce the viscosity of fluids and intensification of other needed to improve tributaries processes necessary to increase the pressure in the borehole and its duration due to the combustion of the charges, as well as to create pressure pulses. However, excessively high excess pressure can break the casing and the adhesion of the cement stone. Therefore, at sufficiently high pressure, safe to wells, the charges must be reliable and not be destroyed in the combustion process with the appearance of abnormally high Usmanov pressure.

Known methods of processing of the PPP and design channel solid-propellant charges for their implementation, for example [1, 2]. They have drawbacks that hinder their use due to cumbersome tted the TCI in the channel checkers. The metal parts of the snap may remain in the well after their treatments. In addition, this snap prevents the exit of products of combustion from the channel. Because of this, and also due to the lower strength of the health charges at elevated temperatures and pressures increase the probability of their breaks from channels as gases conditions do not have time to leave the channel and pumps charge from within.

The known method termoliticheskogo stimulation, as well as solid propellant charge for its implementation, with varieties [3]. It features alternating channel and ductless solid elements. The method is carried out by the device charges situated in a hollow housing with an igniter. The lower end of the housing muted, and the top end is a regulator of the flow of gases. The device resembles a rocket engine with a pulsed expiration of the combustion products through the nozzle.

The device is complex and cumbersome and will not work effectively under certain conditions in the well. It is unable to create the high pressure inside the device due to its rupture.

Charges devices [3], burning only from the end, at low pressures will spontaneously subside when the pulsations, as is the case in rocket engines solid fuel.

An important factor for improving the Oia ignition face charges in the well and prevent their subsequent decay is the possibility of initiation of such charges from the bottom of the channel charges, which ignite faster. Then the combustion products will be harder to approach and contact with the end surface ductless charges and more imparting heat to ignite and maintain combustion.

The device according to the invention [3] does not allow us to conduct a qualitative ignition end of discharge as the igniter is located over him in front of the nozzle. The combustion products coming from the end surface, and not feed it.

The closest technical solution chosen as a prototype for the proposed method is a complex method of well stimulation [4]. According to this method, a solid propellant charge has no elements snap into the channel and is not located within a hollow housing with an igniter, as in the invention [3].

The method allows to create to make termoliticheskogo, as well as pressure and vibration wave impact on the PPP gaseous combustion products open frame cylindrical solid propellant charge with a Central circular channel and exposed on the opposite cylindrical surfaces of the solid segments parallel to the axis of the Central channel and the ratio of channel length to its diameter equal (40-120):1. The ratio of the circumference of charge to the base of each of the segments is (6-9):1. The segments are longitudinal grooves for the rope, with the United logging cable. The distance between the grooves is equal to the outside diameter of the cylindrical part of the charge.

The method for a large number of wells has shown its high efficiency. But when the temperature layers +60-90°C and depths of 2.5-3.5 km (high pressures) the use of such a long charge difficult. When the charge in the well over 1.5 hours it becomes soft and bent. Line of ignition may fail.

This behavior of the burning charge associated with increasing temperature and pressure in the well, with the increase in the ratio of channel length to its diameter. The combustion products do not have time to go out of the cavity of the channel charge. There is a certain pressure differential between the cavity of the channel and surrounding the charge environment, which can be tens of atmospheres. At the same time, the circumferential deformation of the channel charge, increase several times. When the critical pressure drop, there is the danger of rupture of the charge inside.

On the other hand, the capabilities of the method can be extended if the shortening of charge, and also by regulating the amplitude and duration of the excess pressure in the well created by increasing the burning crest of the fuel.

Pressure control is possible and with the additional use charge, no channel. He goldencadino to function under extreme conditions in the well (elevated temperatures and pressures), when deteriorate the strength characteristics of the charge.

The closest technical solution chosen as a prototype for the inventive device, with which the inventive method is a device for processing a productive formation [5]. It contains a solid propellant charge, not having a body connected to the cable by the cable. The charge has a Central circular through channel with an aspect ratio of channel length to diameter equal (22-38):1. On the opposite cylindrical surfaces of the charge has longitudinal grooves for the rope device Assembly. This charge will be able to operate reliably under extreme conditions. But its functionality can be extended with extra charge without such a channel.

The aim of the present invention is to increase processing efficiency of the well by the combination of channel and ductless charges, improve the safety of their use and enhanced operational capabilities of the method of well stimulation [4] and devices [5].

This goal according to the method is achieved as follows. In the known method, including the creation of excess pressure in the well by affecting the formation of gaseous products of combustion planar cylindrical solid propellant charge having an igniter Central to who's window channel and the speakers on the opposite cylindrical surfaces of the solid segments parallel to the axis of the Central channel is made to rope device Assembly longitudinal grooves and distance between the grooves is equal to the outside diameter of the cylindrical part of the charge, what's new is that the creation of controlled amplitude and duration of the excess pressure in the well without deformation and bursting charge, called the critical pressure exceeds the combustion gases in the cavity of the channel relative to the surrounding charge of the environment, attain setting opposite the reservoir or in the vicinity of the reservoir of charge through the Central circular channel having a ratio of channel length to its diameter is equal to (22-38):1, including increasing the duration of stimulation under reduced pressure, to reach a joining charge additional cylindrical solid propellant charge with the same protruding segments with grooves and the ratio of its length to diameter equal to (5-15):1, with plain ends or with the notch on the end, with the additional ignition of the charge in the borehole is carried out from the igniter lower charge with a through channel or igniters charges through channels located at the top and bottom extra charge, and wires for supplying current from a logging cable to the igniter pass through the channel or longitudinal grooves of the segments of a charge having a through channel, and longitudinal grooves segments additional charge. The specified target device implementing this Declaration, the by the way is achieved as follows. In the known device for creating excessive pressure in the well, through stimulation of gaseous combustion products containing connected to the logging cable planar cylindrical propellant charge igniter having a through Central circular channel, with the ratio of channel length to diameter equal (22-38):1, and the speakers of a charge of solid propellant segments located on opposite cylindrical surfaces parallel to the axis of the Central channel, with made to rope device Assembly longitudinal grooves and the distance between the grooves is equal to the outside diameter of the cylindrical part of the charge, what's new is that the device has an additional cylindrical solid propellant charge with the same protruding segments with grooves and the ratio of its length to diameter equal to (5-15):1, with plain ends or with the notch on the end, with an additional charge in the device is on charge igniter and a through channel or between charges with igniters and end-to-end channels, and wires for supplying current from a logging cable to the igniter through the channel or longitudinal grooves of the segments of a charge having a through channel, and longitudinal grooves segments additional charge.

Pascalc the processing method of the PPP is implemented during operation of the inventive device with a combination of charge through the Central channel charge and without channel the method described in the description section of the device.

Charge through the Central circular channel has a ratio of channel length to diameter (22-38):1.

The minimum ratio is due to the fact that short charges (less than 22:1) use irrational. You will need an undesirable increase in their number, complicating the device and also to create the necessary for processing the well pressure in the combustion process charges. Need more equipment for Assembly and fixing of charges relative to the longitudinal axis during Assembly. In short, the charges may not experience pressure wave due to the vibration of the combustion charge. These waves are generated with the cavity of the channel charge and create a vibration wave impact on the seams, reinforcing their processing.

The maximum ratio is due to the following. When the relations, 38:1 in deep wells and high temperatures, the charges can be dropped because of the considerable excess pressure in the canal above the external pressure.

Charge without channel has a ratio of length to diameter (5-15):1. The minimum ratio of these dimensions is due to the fact that with the further reduction of the channel length (respectively length of charge) requires additional equipment, connecting and centering charges. The device, as in the case of short of kanalni the charge, would be cumbersome.

The maximum length ductless charge to its diameter equal to 15:1, due to the manufacturing technology of the charge and specifics of the Assembly. Technologically, this extended battery is difficult to produce. He bends. Than the temperature of the above, the curves stronger. Collecting it difficult.

Length ductless charge to its diameter in range (5-15):1 is optimal regardless of its diameter. However, it is desirable to have the largest possible diameter. This increases the effect of processing.

Figure 1 shows a schematic diagram of a device according to the invention (longitudinal section). Figure 2 illustrates the execution of the method in the form of pressure changes over time in the well during combustion of the charge.

The device of figure 1 with the rope 1 and the igniter 2 (top and bottom) has a planar cylindrical solid propellant charge 3 with a through Central circular channel with a diameter of 20 mm and a charge without channel 4. The charges have a length of 600 mm and the diameter of the cylindrical part 94 mm At their opposite surfaces are exposed solid segments with slots. The length of the charge 3 corresponds to the length of its channel.

The ratio of the channel length of the battery 3 to the diameter of the channel is 30:1, i.e. is within the claimed relationship of these dimensions (22-38). The ratio of the length of the battery 4 and its diameter is avno 6,38:1, that also is within the stated relations (5-15): 1.

Additional elements of the device used during installation, not shown in figure 1. Rope 1 device Assembly passes through the slots of charges 2 and 3 and connected to the logging cable.

The igniter 2 is a wire filament mounted in the fuel. The igniter may also be an explosive cartridge. The ignitor is located on the bottom of the charge without end-to-end channel with either of its two sides. The wires from the cable 1 to the igniter 2 pass through the channel charge 3 and the grooves charge 4 together with rope. With a large number of alternate charges 3 and 4 Pets passage of wires and grooves. Charge 4 use with smooth ends or with shallow grooves, having the dimension of length not more than the diameter of the charge.

The mounting device (1) can be made directly over the mouth of the well. The number of alternate charges 3 and 4 can be chosen according to geological and technical conditions of well designed for handling the PPP.

The device operates as follows. After his descent to the desired depth serves current through the cable. From 2 igniters first light upper and lower charges 3, and from them the rest. The products of combustion increases the pressure in the well and start punching holes to penetrate into the PPP, realizing thermogut himicheskoe impact. The permeability of the reservoir and consequently the tributaries to the well rising.

Combustion ducted and ductless charges after ignition occurs on all surfaces.

When burning only through charge 3 (figure 1) write down the curve pressure - time in the well shown in figure 2 (curve 1). The maximum of the curve corresponds to the end of the combustion charge. Then comes the pressure drop and attenuating low-frequency longitudinal wave in the wellbore.

When sharing charges with a through channel 3 and charge without it 4 (figure 1) register the curve 2 pressure - time, shown in figure 2. Clearly shows two distinct phases. The first stage is when the joint combustion of the charges, the second only when the combustion of the charge without end-to-end channel. The second stage is characterized by low pressure, existing for longer, with respect to the first stage burn time (at least 4-10 times).

Termination of the combustion charge 3 with continued combustion of the charge 4 driven by the pressure drop to a few times. At a lower pressure decreases and the rate of combustion of fuel. This further increases the duration of the second stage. The result is a more efficient heating of the PPP and, accordingly, the flow of fluids to the well.

The increase in the number of ductless charges on sarado the end-to-end channel leads not only to increase the maximum pressure, but also to increase the pressure of the second stage with the reduction of the time of its existence. A smaller number of charges, by contrast, has the opposite picture. Thus, regulate the magnitude and duration of the pressure at different stages.

At the same time because of improvement of conditions of ignition of the charge from 4 charge 3 (channel always ignite faster ductless) and preheating of the charge 4 it is more reliably and efficiently burn and does not fade out.

An example of performing the method according to the device shown in figure 1.

In the hole with an inner diameter of the bore 127 mm oil reservoir is at a depth of 2.8 km Length of the perforation interval of 3 meters. Downhole temperature +70°C. the reservoir has a high viscosity oil, for the impact you want to increase the time of exposure to products of combustion of the charges. In order to maximize the oil production in this way combine fracturing channel charge (highest pressure in the well) and then stretch the duration of stimulation ductless charge, burning after channel at lower pressures.

When implementing the method, the device shown in figure 1, use alternating four charges 3 length 600 mm with through channels and three ductless charges 4 with the same length. Charges 3 with FOTS what amenities have the top and bottom of the assembled garlands.

Charges devices have opposite perforations. When selected extreme conditions and joint combustion of the charges, the well pressure increases to 74 MPa at time 0.6 seconds after ignition. Then at the end of the combustion charge with a through channel 3, the pressure falls in 3-3,5 times and when burning only ductless charges 4 continued for a further period of 5.7 seconds. The result of the treatment well is a significant increase in oil production and well performance.

The proposed method with the corresponding device can be successfully used in many oil and gas producing regions in a variety of geological and technical conditions of the wells with high performance. Under extreme conditions, they will be more secure.

Sources of information

1. RF patent №2175059 C2, IPC E21B 43/263. The gas generator solid fuel with adjustable pulse for stimulation. Krushenko E, Gribanov NI, Gaivoronsky I.N. and other Appl. 06.10.1999. Publ. 20.10.2001.

2. RF patent №2183740 C1, IPC 6 E21B 43/263. The caseless charge sectional for gas-dynamic stimulation. The Paderin MG, Gazizov F.M. and other Appl. 22.08.2001. Publ. 20.06.2002.

3. RF patent №2261990 C2, IPC E21B 43/263. The way termoliticheskogo stimulation and solid propellant charge for its implementation. Dyblenko VP, Shariful is in RA, Lysenkov A.P. and others Appl. 14.08.2003. Publ. 10.10.2005.

4. RF patent №2282027 C1 IPC E21B 43/263. Integrated method of well stimulation. Pelykh NM, Manarin V.N., Gaisin Russia, having got and other Appl. 16.12.2004. Publ. 20.08.2006. Bull. No. 23 - prototype method.

5. RF patent №100554 for a utility model. IPC 7 E21B 43/45. A device for processing a productive formation. Pelykh NM, Bogdanov HE Appl. 16.07.2009. Publ. 20.12.2010. Bull. No. 35 - a prototype of the device.

1. The method of processing bottom-hole formation zone, including the creation of excess pressure in the well by affecting the formation of gaseous products of combustion planar cylindrical solid propellant charge having an igniter Central circular channel and the speakers on the opposite cylindrical surfaces of the solid segments parallel to the axis of the Central channel is made to rope device Assembly longitudinal grooves and the distance between the grooves is equal to the outside diameter of the cylindrical part of the charge, characterized in that the creation of controlled amplitude and duration of the excess pressure in the well without deformation and bursting charge, called the critical pressure exceeds the combustion gases in the cavity of the channel relative to the environmental charge environment, reach installing the front layer or in the vicinity of the reservoir of charge through the Central round to the cash with the ratio of channel length to its diameter equal (22-38):1, including increasing the duration of stimulation under reduced pressure to reach a joining charge additional cylindrical solid propellant charge with the same protruding segments with grooves and the ratio of its length to diameter equal to (5-15):1, with plain ends or with the notch on the end, with the additional ignition of the charge in the borehole is carried out from the igniter lower charge with a through channel or igniters charges through channels located at the top and bottom extra charge, and wires for supplying current from geophysical cable to the igniter pass through the channel or longitudinal grooves of the segments of a charge having a through channel, and longitudinal grooves segments additional charge.

2. Device for creating excessive pressure in the well, through stimulation of gaseous combustion products containing connected to the logging cable planar cylindrical propellant charge igniter having a through Central circular channel with an aspect ratio of channel length to diameter equal (22-38):1, and the speakers of a charge of solid propellant segments located on opposite cylindrical surfaces parallel to the axis of the Central nervous system, the second channel, made them for a rope device Assembly longitudinal grooves and the distance between the grooves is equal to the outside diameter of the cylindrical part of the charge, characterized in that the device has an additional cylindrical solid propellant charge with the same protruding segments with grooves and the ratio of its length to diameter equal to (5-15):1, with plain ends or with the notch on the end, with an additional charge in the device is on charge igniter and a through channel or between charges with igniters and end-to-end channels, and wires for supplying current from a logging cable to the igniter through the channel or longitudinal grooves segments charge having a through channel, and longitudinal grooves segments additional charge.



 

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1 dwg

FIELD: oil and gas industry.

SUBSTANCE: method involves construction of upper injection well and lower production well with horizontal sections located one above the other, pumping of heat carrier through horizontal injection well with warm-up of formation, creation of steam chamber and extraction of the products through horizontal production well, at which thermograms of steam chamber are picked up, state of the chamber warm-up is analysed for uniform warm-up and available temperature peaks. Considering the obtained thermograms there performed is uniform warm-up of steam chamber, thus changing the warm-up zones. During construction of wells their horizontal sections are equipped with filters. On the mouth of injection well the pipe string for pumping of heat carrier is equipped with pipeline with a gate valve, and outlet openings of pipe string are arranged in the filter, thus dividing it into warm-up zones so that heat carrier breakthrough to production well through the zone that has been warmed up to a greater extent is excluded. Heat carrier supply is controlled depending on the thermogram of steam chamber, which is picked up in production well. In injection well the filter is tightly separated into two warm-up zones made in its initial and end sections. Heat carrier is pumped to the formation via pipe string through the filter, first to final warm-up zone of productive formation, and as the final zone is being wanned up, the pumped steam volume is redistributed between initial and final warm-up zones of productive formation. To the pipe string of injection well there lowered is a stem with a plunger. During the pumping process, the space between pipe string and stem on the mouth of injection well is sealed. Stem with plunger is arranged opposite the first group of output openings of pipe string made on one and the same level along the perimetre of pipe string with increase in their carrying capacity at an angle of 270° between minimum and maximum outlet opening with possibility of their alternative opening and closing. The second group of openings is made in the form of an open end of pipe string. Heat carrier is pumped at constant steam flow rate supplied to pipe string of injection well. Ratio of volumes of heat carrier pumped to initial and final warm-up zones of heat carrier is changed owing to changing the heat carrier volume supplied to the first warm-up zone by means of restricted rotation from well mouth of the stem with plunger through an angle of 25° to 270° relative to the first group of outlet openings of pipe string.

EFFECT: increasing the efficiency of the method due to gradual development of deposits and avoiding direct breakthrough of heat carrier to production well.

4 dwg

FIELD: oil and gas industry.

SUBSTANCE: development method of heavy oil or bitumen mine field with control of heat carrier pumped to the well involves construction of upper injection well and lower production well with horizontal sections located one above the other, pumping of heat carrier through horizontal injection well with warming-up of formation, developing the steam chamber and extraction of product through horizontal production well, picking-up of thermogram of steam chamber, analysis of the warming state for uniform warming-up and availability of thermal spikes, and considering the obtained thermograms, uniform warming-up of steam chamber is performed by changing warming-up zones. At construction of wells, their horizontal sections are equipped with filters, and on the mouth of injection well the pipe string for pumping of heat carrier is equipped with pipeline with a gate valve, and outlet openings of pipe string are arranged in the filter, thus dividing it into warm-up zones so that heat carrier breakthrough to production well through the zone that has been warmed up to a greater extent is excluded; supply of heat carrier is controlled depending on steam chamber thermogram picked up in production well. In injection well the filter is tightly separated into two warm-up zones made in its initial and end sections, and outlet openings of pipe string are made opposite corresponding formation warm-up zones. Pumping of heat carrier to formation is performed simultaneously to both formation warm-up zones; at that, to the pipe string in injection well there lowered is stem with hollow plunger rigidly fixed on its end; space between pipe string and stem on the injection well mouth is sealed. Plunger is equipped with gauged openings with gradual increase in carrying capacity from the end of pipe string to well mouth or from well mouth to the end of pipe string with possibility of their alternative opening and closing. Each gauged opening is tightly arranged opposite one of outlet openings, which is made in pipe string and directed upwards, and the second outlet opening is made in the form of an open end of pipe string. Heat carrier is pumped at constant steam consumption; at that, ratio of volumes of heat carrier pumped to the first and the second warm-up zones is controlled owing to changing the volume of heat carrier supplied to the first warm-up zone by restricted axial movement of stem with hollow plunger and by changing carrying capacity of gauged openings with fastening of stem on well mouth.

EFFECT: increasing operating efficiency of steam chamber due to possible adjustable distribution of pumped steam volume; avoiding direct breakthrough of heat carrier from outlet openings of pipe string and filter of injection well to horizontal section of production well due to the fact that pipe string doe not have any outlet openings that are downward directed vertically to horizontal section of production well, reducing metal consumption and material and financial costs.

3 dwg

FIELD: oil and gas industry.

SUBSTANCE: development method of heavy oil or bitumen mine field with control of heat carrier pumped to the well involves construction of upper injection well and lower production well with horizontal sections located one above the other, pumping of heat carrier through horizontal injection well with warming-up of formation by developing the steam chamber and extraction of product through horizontal production well, picking-up of thermogram of steam chamber, analysis of the warming state for uniform warming-up and availability of thermal spikes, and considering the obtained thermograms, uniform warming-up of steam chamber is performed by changing warming-up zones. During construction of wells their horizontal sections are equipped with filters. On the mouth of injection well the pipe string for pumping of heat carrier is equipped with pipeline with a gate valve, and outlet openings of pipe string are arranged in the filter, thus dividing it into warm-up zones so that heat carrier breakthrough to production well through the zone that has been warmed up to a greater extent is excluded. Heat carrier supply is controlled depending on the thermogram of steam chamber, which is picked up in production well. In injection well the filter is tightly separated into two warm-up zones made in its initial and end sections. To the pipe string of injection well there lowered is a stem with a hollow plunger fixed on its end; during the pumping process, the space of heat carrier between pipe string and stem on the mouth of injection well is sealed; at that, outlet openings of pipe string are divided into two groups and correspond to initial and final warm-up zones of formation. The first group of outlet openings represents upward directed gauged openings of equal diameter d, which are made in the pipe string opposite initial section of filter with possibility of their alternative opening/closing by hollow plunger. The second group of openings is made in the form of a nozzle arranged inside the pipe string with outlet opening with diameter D. Total surface area of outlet openings with diameters d of the first group is larger than surface area of outlet opening with diameter D corresponding to the second group. Pumping of heat carrier to the formation is performed simultaneously to both warm-up zones of formation; at that, to initial section of filter there supplied is heat carrier volume that is by 1.5-2.5 times more than that supplied to the initial one, and as the productive formation is being warmed up, ratio of volumes of heat carrier supply to initial and final sections of the filter is changed depending on steam chamber thermogram. During operation of production well there controlled is carrying capacity of the first group of output openings opposite the first warm-up zone by means of conversion of stem rotational movement to restricted axial movement of plunger.

EFFECT: increasing steam chamber operating efficiency due to uniform generation of heavy fuel oil or bitumen by warming-up the initial warm-up zone of productive formation at the initial stage, avoiding direct breakthrough of heat carrier from outlet openings of pipe string and filter of injection well to horizontal section of production well, simplifying the technology and reducing metal consumption.

3 dwg

FIELD: oil and gas industry.

SUBSTANCE: method involves initiation of in-situ combustion at least in one injection well, pumping and measurement of air flow rate and advancing of combustion front from the well inside the formation under action of pumped air; arrangement of a number of sensors on the surface or at small depth under the ground around injection well; recording of sensors readings. In order to study the spatial position of combustion front, field temperature surveys are performed by means of temperature sensors, and geochemical surveys are performed by means of sorbent sensors and by extracting the soil samples. Location grid of sorbent sensors and soil sampling points coincides with location grid of temperature sensors. Arrangement of sorbent sensors and extraction of soil samples is performed to determine concentrations of hydrocarbon (C1-C6) and non-hydrocarbon (H2, N2, CO, CO2, O2) gases. As per the results of field surveys there built are maps of distribution of temperatures and distribution of concentrations of hydrocarbon and non-hydrocarbon gases; they are interpreted and spatial position of combustion front is determined as per the received materials.

EFFECT: improving accuracy and reducing the time spent on determination of location of in-situ combustion front in oil deposits.

5 cl, 2 dwg

FIELD: oil and gas industry.

SUBSTANCE: development method of high-viscosity oil deposit using wells with inclined sections involves well drilling, arrangement of tubing string in each well, pumping of heat carrier, heating of productive formation with creation of steam chamber by pumping of heat carrier spread to upper part of productive formation with increase in steam chamber dimensions, reduction of viscosity of high-viscosity oil, extraction of products from the well via tubing string and monitoring of process parameters of productive formation and well during product extraction, periodic determination of mineral content of incidentally extracted water, analysis of effect of the mineral content change of incidentally extracted water on uniform heating of steam chamber, and considering the change of mineral content of incidentally extracted water, implementation of uniform heating of steam chamber by controlling the heat carrier pumping mode or well product extraction mode till stable mineral content value of extracted water is achieved. At least two wells with inclined sections are drilled in productive formation; at that, inclined sections of wells are drilled in two vertical planes located at the distance of 1-2 metres from each other and opposite each other with approximation of sections to middle points of each section and with their further withdrawal. Each inclined section is divided into two productive formation opening intervals by installing the packer lowered to the well as a part of tubing string, and ends of tubing strings are located on ends of inclined sections; at that, each tubing string is equipped with extracting pump of heated viscous oil. Heat carrier is periodically pumped to upper productive formation opening intervals, and product is constantly extracted from lower productive formation opening intervals.

EFFECT: increasing the coverage area of deposit heating, increasing the extraction volume of heated high-viscosity oil due to gradual increase of total volume of steam chamber during development; reduction of material and financial costs.

2 dwg

FIELD: oil and gas industry.

SUBSTANCE: method involves drilling of horizontal and vertical injection and production wells, steam pumping to the formation through horizontal well and heating of high-viscosity oil and its extraction. Besides, steam pumping and product extraction is performed simultaneously. Horizontal wells are made in the form of a pair of injection and production wells, the horizontal sections of which are arranged in parallel one above the other in vertical plane and made in the form of a sinewave with intersection of all formations in multiple-formation layer-by-layer nonhomogeneous header. Then, vertical wells are drilled in pairs on both sides of vertical plane of horizontal wells in zones of maximum approximation of horizontal sections of horizontal wells in the roof and bottom of deposit. Drilling in vertical injection wells is performed in lower part of multiple-formation deposit, and in vertical production wells - in upper part of deposit. Besides, opening sections of vertical injection wells shall be made at the distance of not less than 5 m to lower horizontal section, and opening sections in vertical production wells shall have the height of not less than half of the deposit thickness. The deposit is heated by steam pumping to both wells with formation of steam chamber and heating of inter-well zone with reduction of oil viscosity. Steam is pumped to upper horizontal injection well and product is extracted from lower production horizontal well. Then, steam is pumped simultaneously to horizontal injection well and to vertical injection wells to maximum approximation zones of sections of horizontal wells to the deposit bottom. Product extraction is performed simultaneously from horizontal production well and from vertical production wells located in maximum approximation zones of horizontal sections in the deposit roof. Besides, monitoring of process parameters of the deposit and wells is performed during product extraction; periodic determination of mineral content of incidentally extracted water, analysis of effect of the change of mineral content of incidentally extracted water on uniform heating of steam chamber is performed. Considering the change of mineral content of incidentally extracted water, uniform warm-up of steam chamber is performed by controlling the steam pumping or well product extraction mode till stable mineral content value of incidentally extracted water is achieved. Steam pumping and product extraction is performed simultaneously.

EFFECT: increasing the efficiency of the method owing to enlarging the formation heating area and reducing the development period.

2 dwg

FIELD: oil extractive industry.

SUBSTANCE: method includes drilling of well and following concurrent heat treatment of productive bed and treatment by pressure waves. Well is drilled in parallel to ceiling or soil of bed. Acoustic properties of system ceiling-bed-soil are examined. Bed oscillation frequencies are determined. Acoustic characteristics of system ceiling-bed-soil are determined and concurrently heat and pressure waves treatment is performed in frequencies range containing spectrum of frequencies in resonance with frequencies of bed oscillations. Length of well is selected divisible by integer number of waves, direction of which is perpendicular to ceiling or bed soil, appropriately to analytical relation.

EFFECT: higher efficiency.

5 cl, 1 ex, 1 tbl, 2 dwg

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