Gas detection device to detect gas presence in well during well drilling

FIELD: equipment for reservoir gas presence in drilling mud flow passing via well during well drilling.

SUBSTANCE: device comprises at least on sensing chamber to be connected to drilling string for well drilling. Each sensing chamber contains taken gas volume and comprises membrane wall for reservoir gas penetration from drilling mud flow in sensing chamber. Sensor provides determination of said gas volume characteristics change caused by reservoir gas penetration from drilling mud flow in sensing chamber through membrane wall.

EFFECT: increased reliability and accuracy of gas detection.

16 cl, 4 dwg

 

The present invention relates to a device for determining the presence of formation gas in the flow of drilling fluid passing through the borehole during drilling. When you search for hydrocarbon liquid fossil found in the strata of the earth, it is important to identify at an early stage, the inflow of gas from the strata of the earth in the borehole during the drilling. If the gas is under high pressure, the determination of its presence is a very important task to ensure proper monitoring wells and the prevention of undesirable conditions during the drilling of wells. In addition, the inflow of gas in the well fluid carries valuable information about the different strata of the earth, through which the borehole. Thus, the flow of gas can be an indicator of getting well in the rich hydrocarbon resources of the search area or a dangerous indicator of the upward emission. Types of gases, most often in the strata of the earth, are as follows: methane (CH4), carbon dioxide (CO2) and nitrogen (N2). In addition, during drilling can meet N2S.

These types of gases can occur either in the form of free gas bubbles, either in the form of a gas dissolved in a liquid.

To date regularly and it was difficult to accurately determine the presence of gases coming from the strata of the earth during the drilling

The objective of the invention is to provide a reliable and accurate device for determining the presence of formation gas in the flow of drilling fluid passing through the borehole during drilling.

In accordance with the invention, a device for determining the presence of formation gas in the flow of drilling fluid passing through the borehole during drilling, and the device comprises at least one touch camera that can be attached to the drill string for drilling the wells, and each touch camera contains a sensor and a certain amount of the selected gas and equipped with a membrane wall, through which can pass the Plast gas from the stream of drilling fluid in the sensor chamber, and the sensor is designed so that through him it was possible to determine the change in selected characteristics mentioned gas volume due to the passage of gas from the reservoir flow drilling fluid through the membrane wall into the camera sensor.

Membrane wall allows gas to pass to touch the camera. By determining the changes in selected characteristics due to the passage of gas through the membrane can reach that periodically generated signal indicating a passage of gas.

Preferably, the membrane wall was both hydrophobic and oleophobic. So about what atom effectively prevent the penetration as oil, and water to touch the camera, so you can use as a sensor microelectromechanical (MEM) solid-state sensor. Such MEM sensors can be performed on a silicon basis and/or on a polymer basis. You can use different types of MEM sensors, including conductive sensor, thermal sensor and an electrochemical sensor, such as a metal electrochemical sensor.

In a preferred embodiment, the device includes a device for equalizing pressure made with the possibility to maintain the gas pressure in the sensor chamber is essentially equal to the fluid pressure in the mud flow. Thanks to the small difference in gas pressure between the sensor chamber and the fluid in the borehole membrane wall may vary low pressure infiltration, which is a useful feature from the point of view of the reaction device to changes in the concentration of reservoir gas in drilling mud. In addition, since the gas pressure is aligned with the fluid pressure, the device may be suitable for use at any depth.

In a particular preferred embodiment of the invention the device comprises first mentioned sensor camera and the second mentioned touch the camera, and means for supplying gas containing a device for feeding is, I can pay tithing mentioned selected gas in the first touch camera and a device for feeding the second mentioned selected gas to the second touch camera. Each sensor cameras has its own individual response to the presence of formation gas of a certain type, which allows the analysis of the composition of the gas reservoir in the well by combining the sensor signals.

The invention is described in more detail below based on examples with reference to the accompanying drawings, which depict:

figure 1 is a schematic depiction of the drill string equipped with an embodiment of the device according to the invention;

figure 2 - schematic of the device represented in figure 1;

figure 3 is a schematic depiction of an alternative apparatus for equalizing pressure for the device presented in figure 1;

figure 4 is a schematic depiction of an alternative embodiment of the device according to the invention.

In the drawings, the same reference positions indicated similar components.

1 shows a drill string 1 in the borehole 2, made in layer 4 of the earth. Drill string 1 is equipped with drilling crown 6 at its lower end and a device 8 for determining the presence of gas, suitably mounted in the frame 10, made in the wall 11 of the drill string 1 a short distance above the drill crown 6. Position 12 is indicated the flow of the drilling fluid pumped through the drill string 1 to the drill crown 6, where the flow passes through the nozzle inlet and the key 14 of the drill crown in the borehole 2 and goes up through the annular space 16 between the wall of the borehole and drillstring 1.

A device for determining the presence of gas includes a sensor chamber 18, rigidly mounted in the opening 10 wall 11 of the drill string, as shown in more detail in figure 2. Touch the camera 18 includes a membrane wall 20 having a repulsive force acting on the fluid in the borehole. Membrane wall 20 is made in the form of a package consisting of hydrophobic (water-repellent) membrane 22 and oleophobic (Nefteotdacha) membrane 24. Membranes 22, 24 is permeable to gas, i.e. the gas can pass through them from the stream of drilling fluid 12 in the sensor chamber 18, but at the same time they prevent the passage of water (membrane 22) and oil (disc 24) in the sensor chamber 18. Microelectromechanical (MEM) solid-state sensor 26 is installed in the sensor chamber and properly connected with a control system (not shown)located on the surface. The sensor 26 is MAMD catalytic sensor conductivity (pellistors) and contains a heat source and a temperature sensor mounted at a selected distance from the heat source.

Touch the camera 18 is filled with a volume of selected purge gas. In this example, the purge gas is helium, however, as the purge gas can be used neon, argon or any other suitable reference gas.

The flow of helium to provide the more from a tank 28 for storage, attached to the sensor chamber 18 through conduit 30 and control valve 32.

Provided by the device 34 to align the pressure to maintain the gas pressure in the sensor chamber 18 at a level essentially equal to the fluid pressure in the mud flow 12. The device 34 to equalize pressures in the embodiment represented in figure 2, includes a housing 36, which includes a chamber 38 for the liquid and the camera 40 for gas, separated from the chamber 38 to the fluid by a flexible wall 41. The camera 38 for fluid communicates via a fluid flow of the drilling fluid 12 by the pipe 42, and the camera 40 for gas reported by fluid from the cavity touchscreen camera with 18 pipes 43 and 30. Through outlet line 44 containing a regulating valve 45, provide connections for fluid between the sensor chamber 18 and the fluid flow 12. Flexible wall 40 in the housing 36 is performed, for example, from an elastomeric material. Adjusting valves 32, 45 is controlled using the control system (not shown).

Figure 3 schematically depicts an alternative device 74 for pressure balance. This embodiment differs from the device described above, the fact that it lacks the flexible wall 36 separating the fluid 78 from the gas 80. Liquid 80 can serve the housing 36 to open the connecting pipe 42, which can be equipped with a shut-off valve 81. Gas 80 may be the purge gas, which is fed to the cavity touch camera 18 through the pipes 43 and 30. Through the exhaust pipe 44, optionally equipped with a regulating valve, provide connections for fluid between the sensor chamber 18 and the fluid flow 12. To ensure proper operation of this variant outdoor connecting line 42 must be connected to the housing 36 in the lower part of the housing 36, as a branch of fluid 78 from the gas 80 is based on gravity.

Device for equalizing pressures in General can also be embedded into the system to detect the presence of gas, for example, described above, containing a suitable sensor, different from MEMD sensor.

4 shows an alternative embodiment of the device according to the invention, in which the first touch camera 50 and the adjacent second touch camera 52 is mounted in the opening 10 in the wall of the drill string 11. First touch the camera 50 signed the first MAMD sensor 53, and the second touch camera 52 is enclosed second MAMD sensor 54. The sensors 53, 54 are connected to the controller 56, associated with the appropriate control system (not shown)located on the surface, a control line 58. The supply of helium purge gas is carried out of the tank 60 for storage, connected to the first touch camera 50 pipeline 62 and control valve 63, and the supply of the purge gas argon is carried out of the tank 64 for storing connected with the second touch camera 52 pipeline 66 and control valve 67. Regulating valves 63, 67 is controlled by the controller 56, which, in turn, is controlled by a control system located on the surface. The controller is powered by a battery 68.

During normal operation, the version presented on figures 1 and 2, a drill string rotates to continue drilling wells 2 are circulating stream of drilling mud 12 down through the drill string 1 and up the annular space 16 between the wall of the borehole and drillstring 1. Touch the camera fills the selected purge with helium gas. As discussed below, the purge gas refill after each cycle to determine the presence of formation gas. MEM sensor continuously transmits a signal characterizing thermal conductivity of the gas located in the sensor chamber 18. The signal essentially has a constant value up until in the sensor chamber 18 does not come Plast gas.

When the well 2 is provided in a reservoir containing gas, such as ethane, carbon dioxide or nitrogen, a certain quantity of gas enters the stream b is the global solution 12, passing through the annular space 16. The gas may be dissolved in a liquid or may be in the form of bubbles when the liquid becomes supersaturated with gas. The gas may be in the form of large clusters in the case, if the well 2 hits in the volume of gas under high pressure. Thus the partial pressure of each gas component in the fluid flow 12 is higher than in the sensor chamber 18 filled with helium.

Due to the difference between the partial pressure in the mud flow 12 and the sensor chamber 18 of the gas in the flow of the drilling fluid 12 enters the sensor chamber through the membrane 22, 24. This applies to every single kind of gas dissolved in the stream of drilling fluid 12. The water from the stream of drilling fluid 12 in the sensor chamber 18 hampered by a hydrophobic membrane 22, and the ingress of oil from the flow of drilling fluid 12 in the sensor chamber 18 hampered by oleophobic membrane 24. When the gas flow into the sensor chamber 18 thermal conductivity of the gas environment around MAMD sensor 26 will change. As a result, the value of the output signal of the sensor 26 changes from level related to conductivity purge gas to a level related to Plast gas received in the sensor chamber 18. The modified signal indicates the presence of p is stowage gas, received in the sensor chamber 18. Thus, the status of the gas in the device according to the invention consists in determining the difference between the characteristics of the sample gas and the reference purge gas. The volume of gas in the sensor chamber 18 is relatively small, making (requires only a small volume of sample gas from the stream of drilling fluid 12. Therefore, the analysis takes a short period of time, and a small amount of purge gas required to clean the touch camera 18 to prepare for the next measurement.

Produce a number of measurements, after each measurement, the sample gas is removed by opening the regulating valve 32 and, therefore, blowing touchscreen camera with 18 helium supplied from a reservoir 28 for storage.

With the help of the device 34, 74 to equalize pressures provide the conditions under which the gas pressure in the sensor chamber 18 is maintained essentially equal to the fluid pressure in the mud flow 12. Thus achieve the conditions under which the membranes 22, 24 are not damaged due to high differential pressure on the membranes 22, 24. Thus, with the help of the device 34, 74 for pressure-balancing device according to the invention can be used in deep boreholes, for example, a depth of 1 km is more or 3 km and more the device according to the invention can be situated as close as possible to the lower end of the drill string. The location of the device near the lower end of the drill string allows you to achieve early detection of gas reservoir deep in the well.

In addition, the use of the device 34, 74 for equalization of pressure allows the use of relatively thin membrane wall with a relatively large surface area, which is beneficial to reduce to the minimum delay between the appearance of the formation of gas in the mud flow and early detection.

The described embodiment of the device 34 for alignment contains a pressure chamber 38 to the fluid chamber connected with the fluid flow in the annular space 16 wells, and the camera 40 to the gas chamber connected in fluid with gas-filled sensor chamber 18. With this structure enables the communication of pressure between the gas-filled sensor chamber 18 and the fluid-filled annular space 16 wells. At the same time by a flexible wall 41 is separated flow 12 from the gas in the sensor chamber 18. Thus, with the help of the device 34, 74 to align the pressure to separate the fluids in the borehole from the gas in the chamber 18.

Described alternative embodiment of the device 74 to stabilize the air traffic management pressures contains fluid 78, chamber connected with the fluid flow in the annular space 16 wells, and gas 80 which is connected with the gas-filled sensor chamber 18. With this structure enables the communication of pressure between the gas-filled sensor chamber 18 is filled with fluid annular space 16 wells. Due to the fact that there is no flexible wall separating the stream 12 from the gas in the sensor chamber 18, this embodiment is advantageous as it allows to exclude the conditions under which the absence of a pressure differential between the liquid and gas can take place due to the fact that the flexible wall can serve as a mechanical support. However, this alternative embodiment has the disadvantage risk associated with the ability of liquids to touch the camera.

To compensate for the relatively large gas compression during lowering of the apparatus into the borehole to the depth component of the first approximately 500 m, the purge gas is located in the housing 36 may be optionally subjected to preliminary compression by overlapping the cut-off valve 81. When they have reached a depth of approximately 500 m, the shutoff valve can be opened to allow a direct connection to the well. Thus, the volume required for gas 80 in the housing 36 may be reduced.

Capillary pressure in the membranes 22, 24 leads to a relatively small differential pressures on the diaphragms 22, 24. By selection of the membranes 22, 24 with very small pores can provide the conditions under which this pressure differential may be in the range 2-14 bar. The helium pressure in the reservoir 28 to the storage used for purging touch camera 18 should be higher than the maximum expected pressure in the well.

As methods of measuring, you can choose the one that determines the amplitude of the signal, where after the initial burst signal becomes stable after a relatively long period of time, i.e. after approximately 80 min in each dimension. A more preferred technique involves the measurement of the steepness of the output signal as it changes over time as a result of diffusion of reservoir gas in the sensor chamber 18. This is a quick measurement of about 15-20 s of the total cycle time. Each dimension includes alternate supply of purge gas and the flow of formation gas every 15 sec. For improved measurement accuracy averaging in the statistical sense can be made using a large number of data measurements. The steepness of the output signal is proportional to the partial concentration of dissolved gas. In addition, in the presence of free gas in p the current 12 slope is significantly different from the case when the gas is dissolved in the stream 12, so that this difference can be used for detection of the gas phase, i.e. recognition of the fact, whether dissolved gas in the liquid or it is present in a free state in the drilling fluid in the return flow from the drill bit 6.

Normal operation of the device according to the embodiment represented in figure 4 is essentially similar to the normal action of the device according to the options of execution, are presented in figures 1, 2 and 3. The main difference is that instead of one purge gas in the sensor cells 50, 52 are using different purge gases: helium, and argon. First touch the camera 50 is filled with helium and touch the camera 52 is filled with argon. When reservoir gases (methane, carbon dioxide and nitrogen) come in touch cameras 50, 52, thermal conductivity of the gas in the sensor chamber 50 changes differently than thermal conductivity of the gas in the sensor chamber 52. Thus, the sensor signal 53 is changed differently from the sensor signal 54. In addition, the signal changes depending on the concentration of the respective components: methane, carbon dioxide and nitrogen. By calibration of a signal from the touch of the camera 50 and the respective gas components (methane, carbon dioxide and nitrogen), get the first equation in the result of measuring the response at the chosen temperature inside the sensor. The second equation is obtained from the conditions, namely, that the sum of all three concentrations of the gas components (CO2N2and CH4) is equal to the unit. The third equation is obtained by calibration of a signal from the touch of the camera 52 and the respective gas components (methane, carbon dioxide and nitrogen). By solving these equations can be obtained comprehensive information.

Each sensor 53, 54 has its own electronic installations and gain so that the signal levels optimize when the information reading and for solving a system of three equations with three unknowns. It is possible that the problem of recognition of the three gas components can be reduced to the problem of recognition of one gas component by using known data about the well. For example, by assumption, namely, that in certain well the concentration of methane in natural gas is the only variable.

You can also use the expected Plast gas, for example, N2CH4or H2S, one touch camera. The chamber filled with this kind of gas should not register changes in selected characteristics of the gas detected by the sensor. If at the same time the second sensor camera detects changes in selected characteristics, it is is direct and quick indication of the this type of reservoir gas is present in the stream of drilling mud.

1. System for determining the presence of formation gas in the flow of drilling fluid passing through the borehole during drilling, the system contains at least one touch camera, configured to attach to the drill string for drilling a borehole, with each touch camera contains a sensor, the amount of the selected gas and the membrane wall, which allows you to penetrate Plast gas from the stream of drilling fluid in the sensor chamber, and the sensor is configured to determine changes in selected characteristics of the above-mentioned gas volume resulting from the penetration of the gas reservoir of the flow of drilling fluid through the membrane wall to touch the camera.

2. The system according to claim 1, in which the mentioned membrane wall, in essence, prevents the penetration of liquid from the flow of drilling fluid in the sensor chamber.

3. The system according to claim 1 or 2, in which the membrane wall is both hydrophobic and oleophobic.

4. The system according to claim 3, in which the membrane wall is made in the form of a package containing a hydrophobic membrane and an oleophobic membrane.

5. The system according to claim 1, in which the sensor is arranged to define or measure, the change of thermal conductivity mentioned volume of the gas.

6. The system according to claim 1, in which the sensor includes a heat source and a temperature sensor located at a selected distance from the heat source, and in which the mentioned volume of gas is located between the heat source and the temperature sensor.

7. The system according to claim 1, in which the sensor is a microelectromechanical (MEM) solid-state sensor.

8. The system according to claim 7, in which the sensor is a conductive MEM catalytic (pellistor) sensor.

9. The system according to claim 1, additionally containing a device for equalizing pressure made with the possibility to maintain the gas pressure in the sensor chamber is essentially equal to the fluid pressure in the mud flow.

10. The system according to claim 9, in which the device for equalizing pressure includes a housing, which contains the liquid and the gas, and the body is made with the possibility of application of the force action of one substance on another, and the fluid in the housing, communicates via a fluid flow of the drilling fluid and the gas in the housing, communicates via a fluid touch camera.

11. The system of claim 10, in which the housing contains a chamber for liquid and a chamber for gas, separated from the chamber for fluid movable wall, and a chamber for fluid communicates via a fluid flow of the drilling fluid, and the chamber gas is reported by those who UCA environment with the touch of a camera.

12. The system according to claim 11, in which the mentioned movable wall is a flexible wall.

13. The system according to claim 1, further containing a means for gas supply, intended for submission referred to the chosen gas in the sensor chamber.

14. The system of item 13, in which the system contains the first mentioned sensor camera and the second mentioned touch the camera, and in which the means for supplying gas contains a device for feeding the first mentioned of the chosen gas in the first touch camera and a device for feeding the second mentioned of the chosen gas to the second touch camera.

15. The system of item 13 or 14, in which the means for supplying gas made with the possibility of blowing each touch camera corresponding the chosen gas.

16. The drillstring equipped with a system according to any one of claims 1 to 15.



 

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3 dwg

FIELD: oil industry.

SUBSTANCE: device has hollow cylindrical body, branch pipes for extraction and output of sample and locking element. Body is made thick-walled. End portions of body are made in form of truncated cone and interconnected, on the side of lesser bases by means of channel. Branch pipe for extraction of sample is made elongated, with length equal to body diameter, and is let through in transverse direction of body through the center of said channel. Within limits of branch pipe cross-section its hollow is separated by slanted solid wall on two portions, each of which is connected thereto. One portion of branch pipe hollow is meant for taking sample, other one - for feeding reagent into well product. To receive trustworthy information about sample, by setting flow to homogenous state, inner surface of cone, on the side of larger base, is provided with rigidly fixed blades for turbulization of flow flowing into body, while diameter of channel connecting cones is selected equal to diameters of their lesser bases.

EFFECT: simplified construction, broader functional capabilities, higher quality of sample.

2 cl, 3 dwg

FIELD: oil industry.

SUBSTANCE: hollow body of device is actually a fragment of force pipeline at mostly vertical portion of mouth armature. Organ for controlling flow of multi-component gas-liquid substance is made in form of valve mounted on shaft having lesser size, than inner diameter of hollow body. Sample chamber is in form of ring-shaped hollow on hollow body, positioned at same level with valve. Ring-shaped hollow is connected at input to flow of multi-component gas-liquid substance through intake channels, positioned symmetrically to valve rotation axis, and at output - with locking organ. Driving screw mounted on body of locking organ is connected to sample-taking valve with possible mutual rotation and combined axial displacement. Sample-taking valve and shaft with valve are mated with possible synchronous rotation around common axis and relative axial displacement. Working organs of device are positioned immediately near main flow of substance taken as sample to provide for lesser dimensions of device and prevented freezing in winter season.

EFFECT: simplified construction, simplified maintenance.

7 dwg

FIELD: oil production industry, particularly methods or devices for cementing, for plugging holes, crevices, or the like.

SUBSTANCE: device comprises inflatable packers to be lowered into well along with flow string. One flow string end is closed to provide simultaneous well bore packing, another end is connected to production equipment. Flow string is provided with centralizers located near inflatable packers. Formed in flow string are additional holes located opposite to packers. Well pump is installed inside flow string. High-pressure water conduit having low diameter is connected to above holes. Flow string has perforated orifices created between inflatable packers.

EFFECT: extended operational capabilities.

1 dwg

Sampler // 2257471

FIELD: oil-field equipment, particularly for obtaining fluid samples or testing fluids in boreholes or wells and may be used for integrated obtaining sample of multicomponent liquid-gas systems transported through pipelines.

SUBSTANCE: sampler comprises hollow body installed in high-pressure pipeline of wellhead fittings and extraction chamber with discharge channels. Rotary tool adapted for multicomponent liquid-gas medium flow regulation is installed inside the body. Sampler also has shutoff member with actuated sample extracting valve, handle and guiding tube. Sampler comprises hollow body made as a part of high-pressure pipeline and tool adapted for multicomponent liquid-gas medium flow regulation arranged in hollow body. The tool consists of flap installed on a shaft and having diameter corresponding to inner hollow body diameter, extraction chamber used to extract and mix multicomponent liquid-gas medium flow formed as annular cavity around hollow body. The cavity is divided into inlet and outlet parts by partition arranged at flap level. Inlet and outlet parts communicate with common multicomponent liquid-gas medium flow correspondingly through inlet and outlet channels on hollow body and through opening formed in the partition at sample extracting valve inlet. Drive screw installed in shutoff member body is connected with sample extracting valve so that drive screw and sample extracting valve may perform mutual rotation and move in axial direction. Sample extracting valve and shaft with flap mate each other so that they may perform synchronous limited rotation about common axis and mutual axial movement.

EFFECT: increased simplicity, provision of high-quality mixing of sample product and increased sample reliability.

3 dwg

Sampling device // 2258807

FIELD: oil field equipment, particularly for take samples from wellhead, namely for integrated sampling multi-component gas-liquid medium transported through pipelines.

SUBSTANCE: device has hollow body built in pressure pipeline and formed as a part of the pipeline located on vertical part of wellhead fittings. Multi-component gas-liquid medium flow control unit is made as a gate connected to rotary support shaft. Sampling chamber is created as annular cavity arranged on hollow body at gate level. Sampling chamber inlet is communicated with multi-component gas-liquid medium flow through intake manifolds formed on hollow body. Intake manifolds are side slots arranged symmetrically about gate axis of rotation. Sampling chamber outlet is communicated with shutoff member installed on rotary gate support shaft extension. Shutoff member includes seat, hold-down screw and ball contacting with the seat and embedded in pressure screw end.

EFFECT: simplified structure and increased sampling quality.

2 dwg

FIELD: mining industry, particularly to take subsurface oil samples in running and exploratory wells working in flow mode.

SUBSTANCE: sampling device has tubular body with lock mechanism arranged inside the body and connected to controlling valve assembly from the first side and controllable valve assembly from the second side thereof. Joint relay is screwed on the controlling valve assembly. The controlling assembly is retained in its opened position by joint relay including body with orifices for pin receiving, pusher acting upon the controlling valve assembly and bush with fluid circulation orifices. Valve assemblies include all-rubber valves having 30° cone angles. The relay has barbs to engage with production string connector. When sampling device moves downwards the barbs are brought into folded state.

EFFECT: increased operational reliability and prevention of oil sample degassing due to improved air-tightness of sampling device interior.

2 cl, 1 dwg

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