CN113389523A - Controllable shock wave anti-reflection and carbon dioxide displacement combined gas extraction method and equipment - Google Patents
Controllable shock wave anti-reflection and carbon dioxide displacement combined gas extraction method and equipment Download PDFInfo
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- CN113389523A CN113389523A CN202110656777.3A CN202110656777A CN113389523A CN 113389523 A CN113389523 A CN 113389523A CN 202110656777 A CN202110656777 A CN 202110656777A CN 113389523 A CN113389523 A CN 113389523A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/006—Production of coal-bed methane
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/164—Injecting CO2 or carbonated water
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
Abstract
The invention provides a controllable shock wave anti-reflection and carbon dioxide displacement combined gas extraction method and device, relates to the technical field of gas extraction, and aims to solve the problem that adsorption-state gas is difficult to extract. The method comprises the following steps: s200: sending the controllable shock wave generating device into an experimental drill hole of the coal body, connecting a carbon dioxide supply device to the experimental drill hole, and installing a hole sealing device at an orifice of the experimental drill hole; s400: starting a controllable shock wave generating device, and impacting the coal wall by using shock waves; s600: connecting the gas extraction device to a conventional borehole, and starting the gas extraction device; s800: and starting a carbon dioxide supply device to inject carbon dioxide into the experimental drill hole. The device is used for realizing the method. The invention can lead the gas in the adsorption state in the coal body to be extracted smoothly.
Description
Technical Field
The invention relates to the technical field of gas extraction, in particular to a controllable shock wave anti-reflection and carbon dioxide displacement combined gas extraction method and equipment.
Background
The gas in the coal seam mainly has two occurrence states of a free state and an adsorption state. For a coal seam with high softness and high deterioration degree, the permeability of the coal seam is poor, and gas in the coal body mainly exists in an adsorption state and is not easy to extract.
Disclosure of Invention
The invention aims to provide a controllable shock wave anti-reflection and carbon dioxide displacement combined gas extraction method, so as to solve the technical problem that adsorption-state gas is difficult to extract.
The invention provides a controllable shock wave anti-reflection and carbon dioxide displacement combined gas extraction method, which comprises the following steps: s200: sending a controllable shock wave generating device into an experimental drill hole of a coal body, connecting a carbon dioxide supply device to the experimental drill hole, and installing a hole sealing device at an orifice of the experimental drill hole; s400: starting the controllable shock wave generating device, and impacting the coal wall by using shock waves; s600: connecting a gas extraction device to a conventional borehole, and starting the gas extraction device; s800: and starting the carbon dioxide supply device to inject carbon dioxide into the experimental drill hole.
Further, in step S800, the carbon dioxide injected into the experimental borehole is supercritical carbon dioxide.
Further, before the step S400, the method further includes a step S300: the experimental drill was filled with water.
Further, after the step S400, the method further includes a step S500: heat was supplied to the experimental borehole.
Further, in the step S500, heat is provided for the experimental drilling hole by using a heating rod, the heating temperature of the heating rod is 40-60 ℃, and the heating time is 6-18 h; in the step S800, the injection pressure of the supercritical carbon dioxide is not less than 7.38MPa, and the injection time is 16-32 h.
Further, before the step S800, the method further includes a step S700: the water in the experimental bore was drained.
Further, after the step S800, the method further includes a step S900: and stopping injecting carbon dioxide into the experimental drill hole, measuring the gas pressure in the experimental drill hole, moving the controllable shock wave generating device to the orifice direction of the experimental drill hole for a set distance when the gas pressure in the experimental drill hole is lower than a set pressure value, and continuously repeating the steps S300-S800.
Further, the set distance is 5-15 m.
Further, before the step S200, the method further includes a step S100: the coal body is provided with a plurality of drill holes, the plurality of drill holes comprise the experimental drill holes and the conventional drill holes, and the conventional drill holes are formed in two sides of the experimental drill holes.
The method for gas extraction by combining controllable shock wave permeability increase and carbon dioxide displacement has the beneficial effects that:
when gas is required to be extracted, the controllable shock wave generating device can be arranged in the experimental drill hole, the carbon dioxide supply device is connected to the experimental drill hole, and the hole sealing device is arranged at the hole opening of the experimental drill hole to seal the hole opening of the experimental drill hole; then, starting the controllable shock wave generating device, and impacting the coal wall by using the shock wave generated by the controllable shock wave generating device so as to enable the coal body to generate cracks, wherein the amplitude, impulse, action area and action frequency of the shock wave generated by the controllable shock wave generating device can be set according to the characteristics of the coal body; then, connecting the gas extraction device to the conventional drill hole, and providing a negative pressure environment for the conventional drill hole by using the gas extraction device; and finally, starting a carbon dioxide supply device to inject carbon dioxide into the experimental drill hole, and driving and replacing the gas in the coal body in an adsorption state by using the carbon dioxide to realize the replacement of the gas in the coal body, so that the gas in the coal body is extracted through the conventional drill hole.
According to the controllable shock wave anti-reflection and carbon dioxide displacement combined gas extraction method, the controllable shock wave is used for anti-reflection of the coal body, the carbon dioxide is used for displacement of gas, the gas in the coal body can flow towards the direction of a conventional drill hole in a negative pressure state, and therefore the gas in an adsorption state in the coal body can be extracted smoothly. Moreover, the operation area of the controllable shock wave anti-reflection and carbon dioxide displacement combined gas extraction method is an experimental drill hole independent of a conventional drill hole, so that the influence of carbon dioxide gas on the gas extraction process is reduced, the gas concentration obtained by conventional drill hole extraction is higher, and the gas extraction efficiency is higher.
The second purpose of the invention is to provide the controllable shock wave anti-reflection and carbon dioxide displacement combined gas extraction equipment, so as to solve the technical problem that the adsorption gas is not easy to extract.
The controllable shock wave anti-reflection and carbon dioxide displacement combined gas extraction equipment provided by the invention is used for realizing the controllable shock wave anti-reflection and carbon dioxide displacement combined gas extraction method.
The controllable shock wave permeability increasing and carbon dioxide displacement combined gas extraction equipment has the beneficial effects that:
the controllable shock wave anti-reflection and carbon dioxide displacement combined gas extraction device is used for realizing the controllable shock wave anti-reflection and carbon dioxide displacement combined gas extraction method, and accordingly the controllable shock wave anti-reflection and carbon dioxide displacement combined gas extraction device has all the advantages of the controllable shock wave anti-reflection and carbon dioxide displacement combined gas extraction method, and is not repeated herein.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a structural plan view of controllable shock wave anti-reflection and carbon dioxide displacement combined gas extraction equipment provided by the embodiment of the invention in a working state.
Description of reference numerals:
010-drilling conventionally; 020-experimental drilling; 030-return air crossheading; 040-orbital gate; 050-goaf;
100-a controllable shock wave generating device; 200-a carbon dioxide supply; 300-hole sealing device; 400-a water supply device; 700-pressure gauge; 800-a drilling machine;
210-a supercritical carbon dioxide generator; 220-supercritical carbon dioxide injection switch; 230-an injection pipe;
410-a water injection pump; 420-a water injection pipe; 430-a water injection switch;
510-a drain pipe; 520-a drain switch;
610-temperature controller; 620-heating rod;
810-drill pipe.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Fig. 1 is a structural plan view of the controllable shock wave anti-reflection and carbon dioxide displacement combined gas extraction device provided by the embodiment in a working state. As shown in fig. 1, the embodiment provides a controllable shock wave anti-reflection and carbon dioxide displacement combined gas extraction device, which is used for implementing a controllable shock wave anti-reflection and carbon dioxide displacement combined gas extraction method.
The controllable shock wave anti-reflection and carbon dioxide displacement combined gas extraction method comprises the following steps: s200: the controllable shock wave generating device 100 is sent into an experimental drill hole 020 of a coal body, a carbon dioxide supply device 200 is connected to the experimental drill hole 020, and a hole sealing device 300 is installed at an orifice of the experimental drill hole 020; s400: starting the controllable shock wave generating device 100, and impacting the coal wall by using shock waves; s600: connecting the gas extraction device to the conventional borehole 010, and starting the gas extraction device; s800: the carbon dioxide supply 200 is activated to inject carbon dioxide into the experimental borehole 020.
When gas is required to be extracted, the controllable shock wave generating device 100 can be arranged in an experimental borehole 020, the carbon dioxide supply device 200 is connected to the experimental borehole 020, and the hole sealing device 300 is arranged at the hole opening of the experimental borehole 020 to seal the hole opening of the experimental borehole 020; then, starting the controllable shock wave generating device 100, and impacting the coal wall by using the shock wave generated by the controllable shock wave generating device 100 so as to enable the coal body to generate cracks; then, connecting the gas extraction device to the conventional borehole 010, and providing a negative pressure environment for the conventional borehole 010 by using the gas extraction device; and finally, starting the carbon dioxide supply device 200 to inject carbon dioxide into the experiment borehole 020, and driving and replacing the gas in the coal body in an adsorption state by using the carbon dioxide to realize the replacement of the gas in the coal body, so that the gas in the coal body is extracted through the conventional borehole 010.
According to the controllable shock wave anti-reflection and carbon dioxide displacement combined gas extraction method, the controllable shock wave is used for anti-reflection of the coal body, the carbon dioxide is used for displacement of gas, the gas in the coal body can flow towards the direction of the conventional drill hole 010 in a negative pressure state, and therefore the gas in an adsorption state in the coal body can be extracted smoothly. Moreover, the operation area of the controllable shock wave anti-reflection and carbon dioxide displacement combined gas extraction method is the experiment drill hole 020 which is independent of the conventional drill hole 010, so that the influence of carbon dioxide gas on the gas extraction process is reduced, the gas extracted by the conventional drill hole 010 is higher in concentration, and the gas extraction efficiency is higher.
The controllable shock wave anti-reflection and carbon dioxide displacement combined gas extraction method can be used for integrally, uniformly and controllably improving the anti-reflection of a reservoir stratum needing to be improved by using a controllable shock wave technology, wherein the amplitude, the impulse, the action area and the action frequency of shock waves generated by the controllable shock wave generation device 100 can be set according to the characteristics of a coal body. Compared with hydraulic cutting, hydraulic fracturing and liquid carbon dioxide fracturing, the controllable shock wave can only act on the drilling hole once, and can act on the same position in the experimental drilling hole 020 for multiple times until the seam-making effect of the coal seam is satisfied.
With reference to fig. 1, in the present embodiment, the return air gate 030, the track gate 040 and the gob 050 form a U-shaped space in a lateral direction.
In this embodiment, specifically, in step S800, the carbon dioxide injected into the experimental borehole 020 is supercritical carbon dioxide.
Through injecting supercritical carbon dioxide into experiment drilling 020, compare in gaseous carbon dioxide, supercritical carbon dioxide has stronger adsorptivity, and supercritical carbon dioxide can take place to compete with methane (gas main component) and adsorb after getting into the coal body, replaces absorption state methane, and the characteristic of supercritical carbon dioxide extraction organic matter can dissolve part organic matter in the coal body, helps improving coal body permeability.
Referring to fig. 1, in the present embodiment, the carbon dioxide supply device 200 includes a supercritical carbon dioxide generator 210, a supercritical carbon dioxide injection switch 220, and an injection pipe 230, specifically, the injection pipe 230 is inserted into the hole sealing device 300, an inlet of the injection pipe 230 is connected to the supercritical carbon dioxide generator 210, an outlet of the injection pipe 230 extends into the experimental borehole 020, and the supercritical carbon dioxide injection switch 220 is disposed on the injection pipe 230.
When carbon dioxide needs to be injected into the experimental borehole 020, the supercritical carbon dioxide injection switch 220 is turned on to ensure the smoothness of the injection pipeline 230, and then the supercritical carbon dioxide generator 210 is started to inject the supercritical carbon dioxide generated by the supercritical carbon dioxide generator 210 into the experimental borehole 020 through the injection pipeline 230; when the injection operation of the carbon dioxide is completed, the supercritical carbon dioxide injection switch 220 is turned off, and the flow of the supercritical carbon dioxide to the experimental borehole 020 is cut off.
Specifically, in the present embodiment, the injection pipe 230 is provided with a pressure gauge 700, and the pressure gauge 700 is configured to display the pressure of the fluid inside the injection pipe 230.
By arranging the pressure gauge 700 in the injection pipeline 230, the pressure of the fluid in the injection pipeline 230 can be displayed in real time, so that the extraction operation can be carried out smoothly.
In this embodiment, specifically, before the step S400, the method further includes the step S300: the experimental bore 020 was filled with water.
Before the controllable shock wave generating device 100 generates shock waves to the coal wall, water is filled in the experiment drill hole 020, so that after the shock waves are generated, compressed energy can be directly transmitted to the coal wall through the water, and then the coal body is enabled to generate cracks. The arrangement mode of transferring energy by using water as a medium reduces energy attenuation caused by the transfer of shock waves in air, thereby ensuring the reliability of the shock waves acting on the coal wall.
Referring to fig. 1, specifically, the controllable shock wave anti-reflection and carbon dioxide displacement combined gas extraction device includes a water supply device 400, where the water supply device 400 includes a water injection pump 410 and a water injection pipe 420, specifically, a water injection port of the water injection pump 410 is connected to the injection pipeline 230 through the water injection pipe 420, and the water injection pipe 420 is provided with a water injection switch 430.
When water needs to be injected into the experiment borehole 020, the water injection switch 430 may be turned on, and the water injection pump 410 is started, so that the water injection pump 410 injects water into the injection pipe 230 through the water injection pipe 420, and then flows to the experiment borehole 020 through the injection pipe 230.
This water supply installation 400 is through being connected to injection pipe 230 with water injection pipe 420 for the same pipeline is shared with the injection carbon dioxide process to the water injection process, has not only saved the space, simple structure, low cost moreover.
In this embodiment, specifically, after the step S400, the method further includes the step S500: heat is provided to the experimental borehole 020. By providing heat to the experimental borehole 020, the adsorptivity of the gas can be reduced so that the gas can be more easily desorbed from the medium.
Continuing to refer to fig. 1, specifically, the controllable shock wave anti-reflection and carbon dioxide displacement combined gas extraction equipment comprises a heat supply device, the heat supply device comprises a temperature controller 610 and a heating rod 620, wherein the heating rod 620 is inserted into the hole sealing device 300 and penetrates into the experimental borehole 020, and the temperature controller 610 is configured to control the heating temperature of the heating rod 620.
The arrangement form of the heating device 600 is not only simple in structure, but also reliable in temperature control.
In this embodiment, the heating temperature of the heating rod 620 may be between 40-60 ℃, preferably 50 ℃; the heating time is 6-18h, preferably 12 h. In step S800, the injection pressure of the supercritical carbon dioxide is not less than 7.38MPa, and the injection time is 16-32h, preferably 24 h. So set up, can provide pressure and temperature assurance for the existence condition of supercritical carbon dioxide in experiment drilling 020.
So set up, can provide sufficient heat for experiment drilling 020 to make the coal body around experiment drilling 020 also keep at corresponding temperature, thereby make in the injection supercritical carbon dioxide process, it can be kept in the supercritical state with longer time and accomplish the displacement of gas.
The conditions for generating supercritical carbon dioxide are that the pressure of carbon dioxide is greater than 7.38MPa and the temperature exceeds 31.1 ℃.
In this embodiment, specifically, before the step S800, the method further includes the step S700: the water in the test borehole 020 was drained. Through discharging the water in the experiment drilling hole 020, the supercritical carbon dioxide can be smoothly injected into the experiment drilling hole 020, and then the displacement of the gas is completed.
With continued reference to fig. 1, the controllable shock wave anti-reflection and carbon dioxide displacement combined gas extraction device comprises a drain pipe 510, specifically, the drain pipe 510 is inserted into the hole sealing device 300 and connected to an experimental borehole 020, the drain pipe 510 is configured to drain water in the experimental borehole 020, and the drain pipe 510 is provided with a drain switch 520.
When the water in the test borehole 020 needs to be drained, the drain switch 520 can be turned on, so that the water in the test borehole 020 enters the return air smooth groove 030 along the drain pipe 510. So set up, realized the drainage to the water in experiment drilling 020, guaranteed the drainage reliability.
In other embodiments, a water return port may be provided on the water injection pump 410, and the water discharge pipe 510 may be connected to the water return port. This kind of form of setting up for water through experiment drilling 020 discharged can flow back to water injection pump 410 through drain pipe 510, with water injection pump 410 water injection once more uses, has realized the cyclic utilization of water, has reduced the waste of water resource.
In this embodiment, specifically, after step S800, step S900 is further included: and stopping injecting the carbon dioxide into the experiment borehole 020, measuring the gas pressure in the experiment borehole 020, moving the controllable shock wave generation device 100 to the orifice direction of the experiment borehole 020 for a set distance when the gas pressure in the experiment borehole 020 is lower than a set pressure value, and continuously repeating the steps S300-S800.
The set pressure value may be 1MPa, and the set distance may be 5 to 15m, preferably 10 m.
That is, in this embodiment, the distance from the bottom to the hole opening of the experimental drilled hole 020 is divided into operation sections every 10m, the operation section closest to the bottom of the experimental drilled hole is first operated by the controllable shock wave generator 100, and after completing one anti-reflection and gas displacement operation, the controllable shock wave generator 100 is moved 10m toward the hole opening to perform the next anti-reflection and gas displacement operation.
By the arrangement, the controllable shock wave anti-reflection and carbon dioxide displacement combined gas extraction method can act on the whole experiment borehole 020, and the acting area is large, so that the comprehensive anti-reflection and gas displacement of coal are ensured.
In this embodiment, specifically, before the step S200, the method further includes the step S100: a plurality of drilling holes are formed in the coal body and comprise an experiment drilling hole 020 and a conventional drilling hole 010, wherein the conventional drilling hole 010 is formed in the two sides of the experiment drilling hole 020.
When the controllable shock wave anti-reflection and carbon dioxide displacement combined gas extraction method is used for working, under the action of shock waves emitted by the controllable shock wave generation device 100, coal bodies on two sides of an experimental drill hole 020 are cracked; with the further injection of the supercritical carbon dioxide, the pressure of the experimental drill holes 020 is greater than the pressure of the conventional drill holes 010 at the two sides of the experimental drill holes, so that the injected supercritical carbon dioxide flows towards the directions of the experimental drill holes 020 at the two sides in the coal body permeation process, and the gas in the adsorption state in the coal body is driven to the conventional drill holes 010, so that the gas extraction is realized under the action of a gas extraction device connected with the conventional drill holes 010.
Referring to fig. 1, in this embodiment, the controllable shock wave anti-reflection and carbon dioxide displacement combined gas extraction apparatus may further include a drilling machine 800, and specifically, the controllable shock wave generating device 100 is installed on a drill rod 810 of the drilling machine 800. The feeding of the controllable shock wave generating device 100 to the experimental borehole 020 can be realized by the drilling machine 800.
The operation process of the controllable shock wave anti-reflection and carbon dioxide displacement combined gas extraction method is as follows.
And (5) preparing. The controllable shock wave generating device 100 is sent into an experimental drilled hole 020 through a drill rod 810 by using a drilling machine 800; sending the heating rod 620 and the injection pipeline 230 into the experimental borehole 020, connecting the temperature controller 610 to the heating rod 620, connecting the water injection pump 410 to the injection pipeline 230 through the water injection pipe 420 after detecting that the connection is correct, arranging the water injection switch 430 on the water injection pipe 420, and continuing to connect the supercritical carbon dioxide generator 210 and the supercritical carbon dioxide injection switch 220 to the injection pipeline 230 after detecting that the connection is correct; and installing the hole sealing device 300 and sealing the hole opening of the experiment drilling hole 020. At this point, the site conditions preparation is completed.
And (5) injecting water. And (3) closing the supercritical carbon dioxide injection switch 220 and the water discharge switch 520, opening the water injection switch 430, starting the water injection pump 410, filling water into the experiment drill hole 020 through the injection pipeline 230, and closing the water injection switch 430 and the water injection pump 410 when the water injection pressure in the experiment drill hole 020 reaches 1 MPa.
And (4) increasing the permeability of the coal body. And starting the controllable shock wave generating device 100, and carrying out controllable shock wave operation for 5 times at the hole bottom position of the experimental drilled hole 020.
And (4) heating. The temperature controller 610 and the heating rod 620 are turned on, the heating temperature is set to 50 ℃, and the heating is continued for 12 h.
And (6) draining. The drain switch 520 is turned on to drain the test borehole 020.
And (5) gas drainage. And (4) connecting the conventional drill hole 010 into a gas extraction device, and starting gas negative pressure drainage.
Injecting carbon dioxide. And starting the supercritical carbon dioxide generator 210, opening the supercritical carbon dioxide injection switch 220, and continuously injecting supercritical carbon dioxide into the experimental borehole 020 for 24 hours through the injection pipeline 230 at the injection pressure of 8MPa to complete one controllable shock wave anti-reflection-supercritical carbon dioxide displacement combined enhanced coal bed gas extraction operation.
And (3) closing the supercritical carbon dioxide generator 210 and the supercritical carbon dioxide injection switch 220, after the gas pressure in the experimental drill hole 020 displayed by the pressure gauge 700 is reduced to below 1MPa, opening the water injection switch 430, starting the water injection pump 410, moving the controllable shock wave generation device 100 to the orifice direction of the experimental drill hole 020 for 10m by using the drilling machine 800, enabling the controllable shock wave generation device 100 to enter the next operation section, and repeating the process, so that the controllable shock wave anti-reflection-supercritical carbon dioxide displacement combined strengthening coal seam gas extraction operation of the next operation section is started.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
In the above embodiments, the descriptions of the orientations such as "upper", "lower", "side", and the like are based on the drawings.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A controllable shock wave anti-reflection and carbon dioxide displacement combined gas extraction method is characterized by comprising the following steps: s200: feeding a controllable shock wave generating device (100) into an experimental drill hole (020) of a coal body, connecting a carbon dioxide supply device (200) to the experimental drill hole (020), and installing a hole sealing device (300) at the hole opening of the experimental drill hole (020); s400: starting the controllable shock wave generating device (100) and impacting the coal wall by using shock waves; s600: connecting a gas extraction device to a conventional borehole (010), starting the gas extraction device; s800: activating the carbon dioxide supply device (200) to inject carbon dioxide into the experimental borehole (020).
2. The controllable shock wave anti-reflection and carbon dioxide displacement combined gas extraction method according to claim 1, wherein in the step S800, the carbon dioxide injected into the experiment borehole (020) is supercritical carbon dioxide.
3. The controllable shock wave anti-reflection and carbon dioxide displacement combined gas extraction method according to claim 2, wherein before the step S400, the method further comprises the step S300 of: the experimental bore (020) is filled with water.
4. The controllable shock wave anti-reflection and carbon dioxide displacement combined gas extraction method according to claim 3, wherein after the step S400, the method further comprises the step S500: providing heat to the experimental borehole (020).
5. The controllable shock wave anti-reflection and carbon dioxide displacement combined gas extraction method according to claim 4, characterized in that in the step S500, heat is provided for the experimental drilled hole (020) through a heating rod (620), the heating temperature of the heating rod (620) is 40-60 ℃, and the heating time is 6-18 h; in the step S800, the injection pressure of the supercritical carbon dioxide is not less than 7.38MPa, and the injection time is 16-32 h.
6. The controllable shock wave anti-reflection and carbon dioxide displacement combined gas extraction method according to claim 5, characterized by further comprising, before the step S800, the step S700: draining the water in the experimental borehole (020).
7. The controllable shock wave anti-reflection and carbon dioxide displacement combined gas extraction method according to claim 6, wherein after the step S800, the method further comprises the step S900: and stopping injecting carbon dioxide into the experimental drill hole (020), measuring the gas pressure in the experimental drill hole (020), moving the controllable shock wave generating device (100) to the direction of the hole opening of the experimental drill hole (020) for a set distance when the gas pressure in the experimental drill hole (020) is lower than a set pressure value, and continuously repeating the steps S300-S800.
8. The controllable shock wave anti-reflection and carbon dioxide displacement combined gas extraction method according to claim 7, wherein the set distance is 5-15 m.
9. The controllable shock wave anti-reflection and carbon dioxide displacement combined gas extraction method according to any one of claims 1-8, wherein before the step S200, the method further comprises the step S100: a plurality of drill holes are formed in the coal body, the plurality of drill holes comprise the experiment drill hole (020) and the conventional drill hole (010), and the conventional drill hole (010) is formed in the two sides of the experiment drill hole (020).
10. A controllable shock wave anti-reflection and carbon dioxide displacement combined gas extraction device is characterized by being used for realizing the controllable shock wave anti-reflection and carbon dioxide displacement combined gas extraction method as claimed in any one of claims 1 to 9.
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Application publication date: 20210914 |