CN110714739B - Double-layer superposed single-well drainage and production ground device of coal bed gas-containing system - Google Patents
Double-layer superposed single-well drainage and production ground device of coal bed gas-containing system Download PDFInfo
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- CN110714739B CN110714739B CN201911164774.7A CN201911164774A CN110714739B CN 110714739 B CN110714739 B CN 110714739B CN 201911164774 A CN201911164774 A CN 201911164774A CN 110714739 B CN110714739 B CN 110714739B
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 66
- 239000003245 coal Substances 0.000 title claims abstract description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 230000005540 biological transmission Effects 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 7
- 238000007906 compression Methods 0.000 claims description 6
- 239000003381 stabilizer Substances 0.000 claims description 6
- 230000006835 compression Effects 0.000 claims description 5
- 238000009826 distribution Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 abstract description 4
- 238000007599 discharging Methods 0.000 abstract description 3
- 238000005086 pumping Methods 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 15
- 238000005065 mining Methods 0.000 description 11
- 238000000034 method Methods 0.000 description 8
- 238000011161 development Methods 0.000 description 5
- 238000011160 research Methods 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
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- 238000003860 storage Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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 OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/04—Casing heads; Suspending casings or tubings in well heads
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B43/14—Obtaining from a multiple-zone well
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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Abstract
The invention discloses a single-well drainage and production ground device of a double-layer superposed coal-bed-gas-containing system, which comprises a power device, a production device and a control device, wherein the control device transmits electric energy for the power device and monitors the work of the whole ground device, the power device converts the electric energy into kinetic energy and transmits the kinetic energy to the production device, and each component of the production device is connected with an underground drainage and production device at a drainage and production well opening. The device has the characteristic of high automation degree, the operations of starting, parameter adjustment, closing and the like of the power device can be finely regulated and controlled by the control device through the handheld remote controller, the drainage and production information in the whole stage from the completion of the coal bed gas well to the closing of the drainage and production completion well can be stored and checked in real time, the remote control can be realized, and the power device can be used for respectively pumping and discharging water in the coal bed containing the coal bed gas system at the speed which is most suitable for the characteristics of the reservoir containing the coal bed gas system so as to release the productivity of the reservoir containing the coal bed gas system.
Description
Technical Field
The invention relates to the technical field of coal bed gas development, in particular to a single-well drainage and mining ground device of a double-layer superposed coal bed gas-containing system.
Background
At the present stage, the coal bed gas scale development of China is still mainly concentrated on the east edge of the Ordos basin and the Qinqiang basin, the number of coal bed gas wells of corresponding blocks is close to saturation, and in order to search for new commercial development blocks, the coal bed gas pilot test area of China is expanded towards the Yunnan east Qianxi multi-coal-bed area and the Xinjiang Quadriang basin low-coal-level area. The coal bed gas resource in the Yunnan east Guixi area is huge, has resource conditions for scale development, is a hotspot area for research in the field of coal bed gas for a period of time, and is an important capacity-taking-over area for improving the production capacity of enterprises.
Due to the stress sensitivity of the coal reservoir and the particularity of the coal bed gas reservoir enrichment rule, the multi-coal-bed commingled mining is still in a research test stage, and the gas production rate of most combined drainage and production wells cannot meet the requirement of commercial development. In addition, the difference of reservoir properties among the multi-coal-zone double-layer superposed or even multi-layer superposed coal-bed-gas-containing systems is large, the adaptability mechanism of each coal-bed-gas-containing system to the combined mining process in the combined drainage and mining process is not yet clarified, and the large geological and technical problems still face in the combined drainage and mining of the multi-coal-zone are fully reflected.
Based on this, patent document CN109973058A, entitled "single well drainage and mining device and drainage and mining method for double-layer stacked coal-bed-containing gas system" proposes a layered drainage and mining method that uses single-shaft double-drainage channels in a double-layer stacked coal-bed-containing gas system area, which can help research of inter-layer or inter-system interference and achieve the purpose of releasing the coal reservoir production energy of the double-layer stacked coal-bed-containing gas system area under a relatively economic condition.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a single-well drainage and production ground device of a double-layer superposed coal-bed-gas-containing system.
The technical scheme adopted by the invention is as follows: a double-layer superposed single-well drainage and production ground device of a system containing coal bed gas comprises a power device, a production device and a control device, wherein the control device transmits electric energy for the power device and monitors the work of the whole ground device;
the production device comprises an outer sleeve head four-way joint for connecting a lower outer sleeve, a discharge and production well head and an upper blowout preventer, an inner sleeve head four-way joint for connecting a lower inner sleeve and an upper blowout preventer and two oil pipe head four-way joints symmetrically distributed along the axis of the two sucker rods;
the power device comprises an active steering end and a passive steering end which are symmetrically arranged, the tail end of the active steering end is wound with a belt, the belt is connected with a motor, and the motor transmits kinetic energy to the active steering end through the belt; the active steering end and the passive steering end are connected with the top end of the sucker rod through a transmission rod, the passive steering end rotates along with the operation of the active steering end, and the sucker rod rotates along with the operation of the active steering end and the passive steering end;
the control device comprises a control cabinet and a handheld remote controller, wherein the control cabinet is connected with a water pressure gauge, a sleeve pressure gauge, a liquid flowmeter and a gas flowmeter through cables and signal lines.
Furthermore, a blowout preventer is arranged between the outer casing head four-way joint and the two symmetrically distributed tubing head four-way joints, and the inner casing head four-way joint is embedded in the outer casing head four-way joint.
Furthermore, the active steering end consists of two identical horizontal gears and a vertical gear, the plane where the horizontal gear is located is perpendicular to the sucker rod, the vertical gear is meshed with the upper horizontal gear and the lower horizontal gear, the passive steering end consists of a vertical gear, a direction stabilizer and a compression spring, and the compression spring is connected with the gear rod of the vertical gear and is limited by the vertical gear and the direction stabilizer.
Furthermore, the control cabinet comprises a power distribution assembly and an information control assembly, and the control cabinet further comprises a signal receiver which is fixedly installed at the top of the control cabinet, receives a signal sent by the handheld remote controller and transmits the signal to the information control assembly.
Furthermore, the power device is fixedly arranged on the supporting structure, the oil pipe head four-way joint and the supporting structure are fixed through an oil pipe head upper flange, the oil pipe head four-way joint and the blowout preventer are fixed through an oil pipe head bottom flange, a sleeve pipe head top flange is arranged between the outer sleeve pipe head four-way joint and the blowout preventer, and a sealing box is further arranged at the top end of the power device.
Furthermore, the four-way pipe head comprises two horizontal pipelines and two vertical pipelines, a water discharge valve with a water delivery flange is mounted outside each horizontal pipeline, the water delivery flanges are welded at two ends of the water discharge valve in parallel, and a water pressure meter and a liquid flow meter are mounted at the tail end of each horizontal pipeline of the four-way pipe head respectively.
Furthermore, gas production valves with gas transmission flanges are mounted outside the two horizontal pipelines of the outer casing head four-way joint, the gas transmission flanges are welded at two ends of the gas production valves in parallel, and the tail ends of the horizontal pipelines of the outer casing head four-way joint are respectively provided with a sleeve pressure gauge and a gas flowmeter.
Furthermore, gas production valves with gas transmission flanges are mounted outside the two horizontal pipelines of the inner casing head four-way joint, the gas transmission flanges are welded at two ends of the gas production valves in parallel, and the tail ends of the horizontal pipelines of the inner casing head four-way joint are respectively provided with a sleeve pressure gauge and a gas flowmeter.
Compared with the prior art, the invention has the beneficial effects that:
1. the device can be matched with patent document CN109973058A with the patent name of 'a double-layer superposed coal-bed-gas-containing system single-well drainage and production device and method', and on the basis of combining with a large-diameter drilling technology, the device can realize the purpose of respectively draining and producing gas water produced by two coal-bed-gas-containing systems in a double-layer superposed coal-bed-gas-containing system area with a large thickness of a coal reservoir single system and releasing the capacity of each system of the double-layer superposed coal-bed-gas-containing system.
2. The device has the characteristic of high automation degree, the operations of starting, parameter adjustment, closing and the like of the power device can be finely regulated and controlled by the control device through the handheld remote controller, and the discharging and mining information in the whole stage from the completion of the coal bed gas well to the closing of the well after the discharging and mining can be stored and checked in real time, so that the remote control can be realized, and the automation, the digitization and the intelligent level of the coal bed gas industry are improved.
Drawings
FIG. 1 is a schematic structural diagram of a single-well drainage and production ground device of a double-layer superposed coal-bed-gas-containing system according to the invention;
FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;
fig. 3 is a cross-sectional view of B-B in fig. 1.
Wherein: 1-an active steering end, 1 a-a horizontal gear, 1 b-a vertical gear, 2-a motor, 3 a-a cable, 3 b-a power distribution component, 4-an information control component, 4 a-a signal receiver, 4 b-a hand-held remote controller, 4 c-a signal line, 5-a control cabinet, 6-a control device, 7-an oil pipe head four-way, 7 a-an oil pipe head bottom flange, 7 b-an oil pipe head upper flange, 7 c-a liquid flowmeter, 7 d-a water delivery flange, 7 e-a water pressure gauge, 7 f-a water discharge valve, 8 a-a sleeve pressure gauge, 8 b-a gas delivery flange, 8 c-a gas production valve, 8 d-a gas flowmeter, 8 e-an inner sleeve head four-way, 8 f-an outer sleeve head four-way, 8 g-a sleeve head top flange, 9-inner sleeve, 10-sucker rod, 11-drainage and production wellhead, 12-outer sleeve, 13-passive steering end, 13 a-direction stabilizer, 13 b-compression spring, 14-sealing box, 15-power device, 16-production device, 17-supporting structure, 18-belt, 19-blowout preventer and 20-transmission rod.
Detailed Description
For the purpose of enhancing the understanding of the present invention, the present invention will be further explained with reference to the accompanying drawings and examples, which are only for the purpose of explaining the present invention and do not limit the scope of the present invention.
As shown in fig. 1, 2 and 3, the single-well drainage and production ground device of the double-layer stacked coal-bed-gas-containing system comprises a power device 15, a production device 16 and a control device 6, wherein the control device 6 transmits electric energy to the power device 15 and monitors the operation of the whole ground device, the power device 15 converts the electric energy into kinetic energy and transmits the kinetic energy to the production device 16, and all components of the production device 16 are connected with an underground drainage and production device at a drainage and production well mouth 11.
In the above embodiment, the production device 16 comprises an outer casing head cross-joint 8f for connecting the lower outer casing 12, the production well 11 and the upper blowout preventer 19, an inner casing head cross-joint 8e for connecting the lower inner casing 9 and the upper blowout preventer 19, and two tubing head cross-joints 7 symmetrically distributed along the axis of the two sucker rods 10.
In the above embodiment, the power device 15 includes an active steering end 1 and a passive steering end 13 which are symmetrically arranged, a belt 18 is wound on the end of the active steering end 1, the belt 18 is connected with the motor 2, and the motor 2 transmits kinetic energy to the active steering end 1 through the belt 18; the active steering end 1 and the passive steering end 13 are connected with the top end of the sucker rod 10 through a transmission rod 20, the passive steering end 13 operates along with the operation of the active steering end 1, and the sucker rod 10 rotates along with the operation of the active steering end 1 and the passive steering end 13.
In the above embodiment, the control device 6 includes a control cabinet 5 and a hand-held remote controller 4b, and the control cabinet 5 is connected with a water pressure gauge 7e, a cuff pressure gauge 8a, a liquid flow meter 7c and a gas flow meter 8d through a cable 3a and a signal line 4 c.
In the above embodiment, the passive steering end 13 can make the vertical gear 1b in the passive steering end 13 move left and right within a certain range by using the direction stabilizer 13a and the compression spring 13b, so that the device can work normally under the condition that the distances between the two sucker rods 10 are different, and the adaptability of the device is enhanced.
In the above embodiment, the control device 6 can realize real-time dynamic display and storage of parameters such as the casing pressure gauge 8a, the water pressure gauge 7e, the gas flowmeter 8d, the liquid flowmeter 7c, the rotating speed of the motor 2 and the like, and can also use the handheld remote controller 4b to look up and adjust the drainage and production parameters, thereby realizing fine control of the drainage and production operation of the coal bed gas well.
In the embodiment, a use method of the single-well drainage and production ground device of the double-layer superposed coal-bed-gas-containing system comprises the following steps:
the method comprises the following steps: after the coal-bed gas well finishes the well washing operation, the pump hanging equipment is put into the shaft, and the production device is installed at the position of the drainage and production well opening.
Step two: and selecting a passive steering end matched with the well according to the relative position relation of the two sucker rods in the outer sleeve, assembling a power device, installing the power device on a production device, and connecting a control device through a cable and a signal wire.
Step three: and starting the motor to drive the active steering end to operate through the belt, starting the passive steering end to operate at the moment, starting drainage and gas production operation, respectively regulating and controlling the working frequency of the motor to the optimal drainage and production state of the system containing the coal bed gas according to the reservoir characteristics of the system containing the coal bed gas, and then monitoring and regulating and controlling drainage and production parameters in real time through the control device.
Step four: and when the bottom hole flowing pressure of each coal bed gas-containing system reaches the exhaustion pressure of the reservoir, closing the ground device corresponding to the coal bed gas-containing system, continuing the operation of the ground device corresponding to the other coal bed gas-containing system, closing the ground device corresponding to the coal bed gas-containing system when the bottom hole flowing pressure of each coal bed gas-containing system reaches the exhaustion pressure of the reservoir of the coal bed gas-containing system, and ending the whole drainage and mining operation process.
Step five: and disassembling the surface device according to the reverse order of the installation order, and lifting the pump and recovering the components in the shaft.
The embodiments of the present invention are disclosed as the preferred embodiments, but not limited thereto, and those skilled in the art can easily understand the spirit of the present invention and make various extensions and changes without departing from the spirit of the present invention.
Claims (8)
1. The utility model provides a ground device is adopted to double-deck superpose contains single well row of coal bed gas system which characterized in that: the underground drainage and production well head device comprises a power device (15), a production device (16) and a control device (6), wherein the control device (6) transmits electric energy for the power device (15) and monitors the work of the whole ground device, the power device (15) converts the electric energy into kinetic energy and transmits the kinetic energy to the production device (16), and all components of the production device (16) are connected with an underground drainage and production device at a drainage and production well head (11);
the production device (16) comprises an outer sleeve head four-way joint (8 f) used for connecting a lower outer sleeve (12), a drainage and production wellhead (11) and an upper blowout preventer (19), an inner sleeve head four-way joint (8 e) used for connecting a lower inner sleeve (9) and the upper blowout preventer (19), and two oil pipe head four-way joints (7) symmetrically distributed along the axes of the two sucker rods (10);
the power device (15) comprises an active steering end (1) and a passive steering end (13) which are symmetrically arranged, a belt (18) is wound at the tail end of the active steering end (1), the belt (18) is connected with the motor (2), and the motor (2) transmits kinetic energy to the active steering end (1) through the belt (18); the active steering end (1) and the passive steering end (13) are connected with the top end of the sucker rod (10) through a transmission rod (20), the passive steering end (13) runs along with the operation of the active steering end (1), and the sucker rod (10) rotates along with the operation of the active steering end (1) and the passive steering end (13);
the control device (6) comprises a control cabinet (5) and a handheld remote controller (4 b), wherein the control cabinet (5) is connected with a water pressure meter (7 e), a sleeve pressure meter (8 a), a liquid flow meter (7 c) and a gas flow meter (8 d) through a cable (3 a) and a signal line (4 c).
2. The single-well drainage and production surface device of the double-layer stacked coal-bed-gas-containing system according to claim 1, wherein: a blowout preventer (19) is arranged between the outer casing head four-way joint (8 f) and the two symmetrically distributed oil pipe head four-way joints (7), and the inner casing head four-way joint (8 e) is embedded in the outer casing head four-way joint (8 f).
3. The single-well drainage and production surface device of the double-layer stacked coal-bed-gas-containing system according to claim 1, wherein: the active steering end (1) is composed of two identical horizontal gears (1 a) and a vertical gear (1 b), the plane where the horizontal gear (1 a) is located is perpendicular to the sucker rod (10), the vertical gear (1 b) is meshed with the upper horizontal gear (1 a) and the lower horizontal gear (1 a), the passive steering end (13) is composed of the vertical gear (1 b), a direction stabilizer (13 a) and a compression spring (13 b), and the compression spring (13 b) is connected with the gear rod of the vertical gear (1 b) and is surrounded and limited by the vertical gear (1 b) and the direction stabilizer (13 a).
4. The single-well drainage and production surface device of the double-layer stacked coal-bed-gas-containing system according to claim 1, wherein: the control cabinet (5) comprises a power distribution assembly (3 b) and an information control assembly (4), the control cabinet (5) further comprises a signal receiver (4 a), the signal receiver (4 a) is fixedly installed at the top of the control cabinet (5) and used for receiving a signal sent by a handheld remote controller (4 b) and transmitting the signal to the information control assembly (4).
5. The single-well drainage and production surface device of the double-layer stacked coal-bed-gas-containing system according to claim 1, wherein: power device (15) are fixed to be settled on bearing structure (17), it is fixed with oil pipe head upper flange (7 b) between oil pipe head cross (7) and bearing structure (17), it is fixed with oil pipe head bottom flange (7 a) between oil pipe head cross (7) and blowout preventer (19), install sleeve pipe head top flange (8 g) between outer sleeve pipe head cross (8 f) and blowout preventer (19), seal box (14) are still installed on power device (15) top.
6. The single-well drainage and production surface device of the double-layer stacked coal-bed-gas-containing system according to claim 1, wherein: the oil pipe head four-way joint (7) comprises two horizontal pipelines and two vertical pipelines, the middle parts of the two horizontal pipelines are respectively provided with a water drainage valve (7 f) with a water delivery flange (7 d), the water delivery flanges (7 d) are welded at two ends of the water drainage valve (7 f) in parallel, and the tail ends of the horizontal pipelines of the oil pipe head four-way joint (7) are respectively provided with a water pressure gauge (7 e) and a liquid flow meter (7 c).
7. The single-well drainage and production surface device of the double-layer stacked coal-bed-gas-containing system according to claim 1, wherein: the gas production device is characterized in that gas production valves (8 c) with gas transmission flanges (8 b) are mounted in the middle of two horizontal pipelines of the outer casing head four-way joint (8 f), the gas transmission flanges (8 b) are welded at two ends of the gas production valves (8 c) in parallel, and a sleeve pressure gauge (8 a) and a gas flowmeter (8 d) are mounted at the tail ends of the horizontal pipelines of the outer casing head four-way joint (8 f) respectively.
8. The single-well drainage and production surface device of the double-layer stacked coal-bed-gas-containing system according to claim 1, wherein: the gas production device is characterized in that gas production valves (8 c) with gas transmission flanges (8 b) are mounted in the middle of two horizontal pipelines of the inner casing head four-way joint (8 e), the gas transmission flanges (8 b) are welded at two ends of the gas production valves (8 c) in parallel, and a sleeve pressure gauge (8 a) and a gas flowmeter (8 d) are mounted at the tail ends of the horizontal pipelines of the inner casing head four-way joint (8 e) respectively.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911164774.7A CN110714739B (en) | 2019-11-25 | 2019-11-25 | Double-layer superposed single-well drainage and production ground device of coal bed gas-containing system |
| PCT/CN2020/093931 WO2021103472A1 (en) | 2019-11-25 | 2020-06-02 | Single-well drainage-production ground device for two-layer stacked coalbed methane system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911164774.7A CN110714739B (en) | 2019-11-25 | 2019-11-25 | Double-layer superposed single-well drainage and production ground device of coal bed gas-containing system |
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| CN110714739A CN110714739A (en) | 2020-01-21 |
| CN110714739B true CN110714739B (en) | 2021-09-24 |
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| CN110714739B (en) * | 2019-11-25 | 2021-09-24 | 中国矿业大学 | Double-layer superposed single-well drainage and production ground device of coal bed gas-containing system |
| CN113187448B (en) * | 2021-06-17 | 2022-08-23 | 中国石油化工股份有限公司 | Multi-coal-bed gas combined mining equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US3601190A (en) * | 1969-05-15 | 1971-08-24 | Brown Oil Tools | Well production apparatus with fluid operated valve |
| US20090079255A1 (en) * | 2007-09-21 | 2009-03-26 | Airwars Defense Ip | Harvesting hydrocarbons from coal, shale, peat and landfill seams |
| CN206448798U (en) * | 2017-01-06 | 2017-08-29 | 盐城华亚石油机械制造有限公司 | Coal bed gas special-purpose multifunctional integrated operation device |
| CN107067867B (en) * | 2017-06-01 | 2023-03-14 | 晋城职业技术学院 | Coal bed gas drainage and mining occupational assessment simulation system and method |
| CN109209303A (en) * | 2017-06-29 | 2019-01-15 | 中国石油天然气股份有限公司 | A kind of mining control method of coal bed gas well |
| CN109488581A (en) * | 2018-09-12 | 2019-03-19 | 中国石油天然气股份有限公司 | The mutual balanced linear drive pumping unit control system of one machine twin-well and oil rig |
| CN109441390B (en) * | 2018-09-30 | 2024-05-07 | 昆山艾蓓蓓阀门有限公司 | 36 Inch single-cylinder double-wellhead oil extraction device |
| CN109458161A (en) * | 2018-10-24 | 2019-03-12 | 中国矿业大学 | A kind of multiple seam independence gas system pressure control list pump mining device and discharge and mining method |
| CN109751016B (en) * | 2018-12-03 | 2021-06-01 | 中国石油天然气股份有限公司 | Drainage and mining control method and device and drainage and mining system |
| CN109973058B (en) * | 2019-04-17 | 2021-04-30 | 中国矿业大学 | Single-well drainage and production device and drainage and production method of double-layer superposed coal-bed-gas-containing system |
| CN110714739B (en) * | 2019-11-25 | 2021-09-24 | 中国矿业大学 | Double-layer superposed single-well drainage and production ground device of coal bed gas-containing system |
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