CN109611069B - Large-temperature-difference freeze-thaw circulating system for improving ground drilling gas extraction effect - Google Patents
Large-temperature-difference freeze-thaw circulating system for improving ground drilling gas extraction effect Download PDFInfo
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- CN109611069B CN109611069B CN201811590171.9A CN201811590171A CN109611069B CN 109611069 B CN109611069 B CN 109611069B CN 201811590171 A CN201811590171 A CN 201811590171A CN 109611069 B CN109611069 B CN 109611069B
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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
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
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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 discloses a large-temperature-difference freeze-thaw cycle system for improving the gas extraction effect of ground drilling, which comprises a first pipeline, a first low-temperature-resistant pipeline, a laser range finder, a drilling seal cover, a first three-way joint, a second pipeline, a pulse pump, a third pipeline, a magnetized water generator, a fourth pipeline, a nitrogen pressurizing device, a second three-way joint, a fifth pipeline, a third three-way joint, a sixth pipeline, a nitrogen generator, a seventh pipeline, a nitrogen heating device, an eighth pipeline, a ninth pipeline, a fourth three-way joint, a tenth pipeline, an eleventh pipeline, a liquid nitrogen three-way joint, a second low-temperature-resistant pipeline, a liquid nitrogen pulse pump, a third low-temperature-resistant pipeline and a liquid nitrogen tank, wherein the ultra-large-temperature-difference effect is formed through the interaction of high-temperature high-pressure nitrogen, liquid nitrogen and magnetized water, the cracking effect and the expansion range of a coal body are effectively improved finally, the permeability of the coal body is increased, so that the ground drilling can extract the gas in a large flow, high concentration and long time.
Description
Technical Field
The invention relates to a large-temperature-difference freeze-thaw circulating system for improving the gas extraction effect of ground drilling, and belongs to the technical field of gas extraction.
Background
The low permeability of coal seams in China is a main reason for limiting the gas extraction effect of ground drilling. In order to improve the permeability of the coal seam, the coal seam permeability increasing treatment is generally carried out by adopting a hydraulic fracturing technology, but related research results show that: the hydraulic fracture generated cracks mainly extend along the direction vertical to the minimum principal stress, the generated cracks are few, long cracks are difficult to form, the fracture effect on a coal seam storage body cannot be generated, and the defect of high pressure of a fracturing fluid exists. At present, the application effect of the technology in most mining areas in China is not ideal, and related technical processes need to be further researched. In addition, the Chinese patent with the application number of 201410507011.9 and the name of 'a cold and hot alternating system for improving the gas extraction amount of a coal seam' provides a system for improving the gas extraction well drilling yield by alternately injecting cold and hot, but the lowest temperature of the system which can be realized by the system is only-50 ℃, the highest temperature is 200 ℃, but in the temperature span range, the crack expansion range is limited, and the gas extraction effect is restricted. Therefore, a new ground drilling gas yield increasing system needs to be developed to enrich the technical system for extracting coal bed gas efficiently in ground drilling in China.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the large-temperature-difference freeze-thaw cycle system for improving the gas extraction effect of the ground drilling, which can effectively improve the cracking effect and the expansion range of the coal body and increase the permeability of the coal body, thereby realizing the large-flow, high-concentration and long-time gas extraction of the ground drilling.
In order to achieve the purpose, the invention adopts the technical scheme that: a large-temperature-difference freeze-thaw cycle system for improving the gas extraction effect of ground drilling comprises a first pipeline, a first low-temperature-resistant pipeline, a laser range finder, a drilling seal cover, a first tee joint, a second pipeline, a pulse pump, a third pipeline, a magnetized water generator, a fourth pipeline, a nitrogen pressurizing device, a second tee joint, a fifth pipeline, a third tee joint, a sixth pipeline, a nitrogen making machine, a seventh pipeline, a nitrogen warming device, an eighth pipeline, a ninth pipeline, a fourth tee joint, a tenth pipeline, an eleventh pipeline, a liquid nitrogen tee joint, a second low-temperature-resistant pipeline, a liquid nitrogen pulse pump, a third low-temperature-resistant pipeline and a liquid nitrogen tank, wherein the magnetized water generator is connected with an inlet of the pulse pump through the third pipeline, an outlet of the pulse pump is communicated with one port of the first tee joint through the second pipeline, the other two ports of the first tee joint are respectively communicated with one end of the fourth pipeline and one end of the first pipeline, the other end of the fourth pipeline is communicated with an outlet of a nitrogen supercharging device, an inlet of the nitrogen supercharging device is communicated with one port of a second three-way joint through a twelfth pipeline, the other two ports of the second three-way joint are respectively communicated with one end of a fifth pipeline and one end of an eighth pipeline, the other end of the eighth pipeline is communicated with an outlet of a nitrogen heating device, the other end of the fifth pipeline is communicated with one port of a third three-way joint, the other two ports of the third three-way joint are respectively communicated with one end of a sixth pipeline and one end of a seventh pipeline, the other end of the sixth pipeline is communicated with an outlet of a nitrogen making machine, the other end of the seventh pipeline is communicated with one port of the fourth three-way joint, the other two ports of the fourth three-way joint are respectively communicated with one end of a ninth pipeline and one end of a tenth pipeline, and the other end of the ninth pipeline is communicated with an inlet of the nitrogen heating device, the other end of the tenth pipeline is communicated with one port of a liquid nitrogen three-way joint, the other two ports of the liquid nitrogen three-way joint are respectively communicated with one end of the first low-temperature-resistant pipeline and one end of the second low-temperature-resistant pipeline, the other end of the second low-temperature-resistant pipeline is communicated with an outlet of a pulse liquid nitrogen pump, and an inlet of the pulse liquid nitrogen pump is communicated with a liquid nitrogen tank through a third low-temperature-resistant pipeline; the drilling sealing cover is fixed at the port of the gas extraction pipe in a sealing mode, the other end of the first pipeline and the other end of the first low-temperature-resistant pipeline penetrate through the drilling sealing cover to extend into the gas extraction pipe, and the laser range finder is fixed on the drilling sealing cover;
the liquid nitrogen heating device is characterized in that a first valve is arranged on the second pipeline, a second valve is arranged on the third pipeline, a third valve is arranged on the fourth pipeline, a fourth valve is arranged on the fifth pipeline, a fifth valve is arranged on the sixth pipeline, a sixth valve and a first check valve are arranged on the seventh pipeline, the inlet of the first check valve is communicated with a third three-way joint, a seventh valve and a second check valve are arranged on the eighth pipeline, the inlet of the second check valve is communicated with a nitrogen heating device, an eighth valve and a third check valve are arranged on the tenth pipeline, the inlet of the third check valve is communicated with a liquid nitrogen three-way joint, a first liquid nitrogen valve is arranged on the second low-temperature-resistant pipeline, a second liquid nitrogen valve and a liquid nitrogen check valve are arranged on the third low-temperature-resistant pipeline, and the inlet of the check valve is communicated with a liquid nitrogen tank.
Furthermore, a temperature measuring device is arranged on a first low-temperature-resistant pipeline between the liquid nitrogen three-way joint and the drilling sealing cover.
Further, a gas pressure measuring device is installed on the drilling sealing cover.
Compared with the prior art, the method comprises the steps of firstly pulsating and injecting the magnetized water into the gas extraction pipe of the ground drilling well, then driving the magnetized water into the coal body by the high-pressure nitrogen, then freezing the magnetized water by the liquid nitrogen for multiple times and melting the high-temperature nitrogen, and jointly fracturing the coal body by utilizing the freezing expansion force of the magnetized water and the direct large temperature difference effect of the liquid nitrogen and the high-temperature nitrogen. The magnetized water is injected in a pulsating mode, so that the smoothness of a gas extraction pipe can be ensured, the magnetized water has a larger diffusion range in a coal bed than conventional water, and the pulsating magnetized water can crack coal bodies under the action of the coal bodies, so that the water absorption rate of the coal bodies is increased, the freezing range of subsequent liquid nitrogen is greatly improved, the expansion rate of the coal bodies after being frozen into ice is better, and the cracking effect of freezing-melting of the coal bodies is improved. After the pulse magnetized water is injected, high-pressure nitrogen is injected, which is beneficial to further driving the magnetized water to diffuse and move in the coal body and infiltrating the coal body to the maximum extent. The pulse injection of liquid nitrogen can crack coal bodies and increase the migration distance of the liquid nitrogen, so that more wet coal bodies are frozen by the liquid nitrogen. Along with the gasification of the liquid nitrogen, the pressure accumulation of the nitrogen in the ground well drilling is also helpful for driving the liquid nitrogen to flow in the coal body, further freezing the magnetized water and increasing the coal body cracking effect. Collecting nitrogen gasified by liquid nitrogen, supplementing a nitrogen source by a nitrogen making machine, and forming an ultra-large temperature difference effect between high-temperature high-pressure nitrogen and coal frozen by the liquid nitrogen through the heating and pressurizing effects, so that the coal cracking effect is good, and the coal can be cracked by the high-temperature high-pressure gas. Through the opening degree of control eighth valve, both guaranteed the high pressure environment in the ground well drilling, can also in time get rid of the nitrogen gas that has cooled down, ensure the effect of big difference in temperature. The large-temperature-difference freeze-thaw cycle of the liquid nitrogen and the high-temperature nitrogen to the coal body is implemented for multiple times, the pertinence of coal body cracking is strong, the coal body cracking effect is good, and the permeability of the coal body is greatly improved. In addition, the high-temperature nitrogen can also provide a heat source for gas analysis, so that the analysis rate of coal gas is increased, and the large-flow, high-concentration and long-time extraction of the gas in ground drilling is facilitated. The method has the advantages of greatly reducing the gas extraction flow rate of the ground drilling and having wide practicability.
Drawings
Fig. 1 is a schematic structural view of the present invention.
In the figure: 1. a coal seam; 2. drilling a well on the ground; 3. a gas extraction pipe; 4. a first pipeline; 5. a first low temperature resistant pipeline; 6. a laser range finder; 7. a drilling sealing cover; 8. a first three-way joint; 9. a first valve; 10. a second pipeline; 11. a pulsating pump; 12. a third pipeline; 13. a second valve; 14. a magnetized water generator; 15. a fourth pipeline; 16. a third valve; 17. a nitrogen pressurization device; 18. a second three-way joint; 19. a fifth pipeline; 20. a fourth valve; 21. a third three-way joint; 22. a sixth pipeline; 23. a fifth valve; 24. a nitrogen making machine; 25. a seventh pipeline; 26. a sixth valve; 27. a first check valve; 28. a nitrogen heating device; 29. an eighth pipeline; 30. a seventh valve; 31. a second check valve; 32. a ninth conduit; 33. a fourth three-way joint; 34. a third check valve; 35. a tenth pipeline; 36. an eighth valve; 37. an eleventh line; 38. a liquid nitrogen three-way joint; 39. a temperature measuring device; 40. a second low temperature resistant pipeline; 41. a first liquid nitrogen valve; 42. a gas pressure measuring device; 43. a liquid nitrogen pulse pump; 44. a second liquid nitrogen valve; 45. a first liquid nitrogen check valve; 46. a third low temperature resistant pipeline; 47. a liquid nitrogen tank; 48. a twelfth pipeline.
Detailed Description
The present invention will be further explained below.
As shown in FIG. 1, the present invention comprises a first pipeline 4, a first low temperature resistant pipeline 5, a laser range finder 6, a well sealing cover 7, a first three-way joint 8, a second pipeline 10, a pulsating pump 11, a third pipeline 12, a magnetized water generator 14, a fourth pipeline 15, a nitrogen gas pressurizing device 17, a second three-way joint 18, a fifth pipeline 19, a third three-way joint 21, a sixth pipeline 22, a nitrogen generator 24, a seventh pipeline 25, a nitrogen gas temperature raising device 28, an eighth pipeline 29, a ninth pipeline 32, a fourth three-way joint 33, a tenth pipeline 35, an eleventh pipeline 37, a liquid nitrogen three-way joint 38, a second low temperature resistant pipeline 40, a liquid nitrogen pulsating pump 43, a third low temperature resistant pipeline 46 and a liquid nitrogen tank 47, wherein the magnetized water generator 14 is connected with an inlet of the pulsating pump 11 through the third pipeline 12, an outlet of the pulsating pump 11 is communicated with one port of the first three-way joint 8 through the second pipeline 10, the other two ports of the first three-way joint 8 are respectively communicated with one end of a fourth pipeline 15 and one end of a first pipeline 4, the other end of the fourth pipeline 15 is communicated with an outlet of a nitrogen pressurizing device 17, an inlet of the nitrogen pressurizing device 17 is communicated with one port of a second three-way joint 18 through a twelfth pipeline 48, the other two ports of the second three-way joint 18 are respectively communicated with one end of a fifth pipeline 19 and one end of an eighth pipeline 29, the other end of the eighth pipeline 29 is communicated with an outlet of a nitrogen heating device 28, the other end of the fifth pipeline 19 is communicated with one port of a third three-way joint 21, the other two ports of the third three-way joint 21 are respectively communicated with one end of a sixth pipeline 22 and one end of a seventh pipeline 25, the other end of the sixth pipeline 22 is communicated with an outlet of a nitrogen making machine 24, the other end of the seventh pipeline 25 is communicated with one port of a fourth three-way joint 33, the other two ports of the fourth three-way joint 33 are respectively communicated with one end of a ninth pipeline 32 and one end of a tenth pipeline 35, the other end of the ninth pipeline 32 is communicated with an inlet of the nitrogen gas heating device 28, the other end of the tenth pipeline 35 is communicated with one port of a liquid nitrogen three-way joint 38, the other two ports of the liquid nitrogen three-way joint 38 are respectively communicated with one end of a first low temperature resistant pipeline 5 and one end of a second low temperature resistant pipeline 40, the other end of the second low temperature resistant pipeline 40 is communicated with an outlet of a pulsating liquid nitrogen pump 43, and an inlet of the pulsating liquid nitrogen pump 43 is communicated with a liquid nitrogen tank 47 through a third low temperature resistant pipeline 46; the drilling sealing cover 7 is fixed at the port of the gas extraction pipe 3 in a sealing mode, the other end of the first pipeline 4 and the other end of the first low-temperature-resistant pipeline 5 penetrate through the drilling sealing cover 7 to extend into the gas extraction pipe 3, and the laser range finder 6 is fixed on the drilling sealing cover 7;
a first valve 9 is arranged on the second pipeline 10, a second valve 13 is arranged on the third pipeline 12, a third valve 16 is arranged on the fourth pipeline 15, a fourth valve 20 is arranged on the fifth pipeline 19, a fifth valve 23 is arranged on the sixth pipeline 22, a sixth valve 26 and a first check valve 27 are arranged on the seventh pipeline 25, the inlet of the first check valve 27 is communicated with the third three-way joint 21, a seventh valve 30 and a second check valve 31 are arranged on the eighth pipeline 29, the inlet of the second check valve 31 is communicated with the nitrogen heating device 28, an eighth valve 36 and a third check valve 34 are arranged on the tenth pipeline 35, and the inlet of the third check valve 34 is communicated with the liquid nitrogen three-way joint 38, the second low temperature resistant pipeline 40 is provided with a first liquid nitrogen valve 41, the third low temperature resistant pipeline 46 is provided with a second liquid nitrogen valve 44 and a liquid nitrogen check valve 45, and the inlet of the liquid nitrogen check valve 45 is communicated with a liquid nitrogen tank 47.
Further, a temperature measuring device 39 is arranged on the first low temperature resistant pipeline 5 between the liquid nitrogen three-way joint 38 and the drilling sealing cover 7.
Further, a gas pressure measuring device 42 is mounted on the drilling sealing cover 7.
The laser range finder 6, the pulse pump 11, the magnetized water generator 14, the nitrogen pressurizing device 17, the nitrogen making machine 24, the nitrogen heating device 28, the temperature measuring device 39, the liquid nitrogen pulse pump 43, the liquid nitrogen tank 47 and the gas pressure measuring device 42 are all conventional devices.
The working method of the invention is as follows:
A. when the gas flow in the gas extraction pipe is greatly reduced to 8m3When the coal seam is developed and expanded, the first valve 9 and the second valve 13 are opened, the magnetized water generator 14 and the pulse pump 11 are started, the magnetized water is subjected to pulse action by the pulse pump 11 to obtain pulse magnetized water, the pulse magnetized water enters the gas extraction pipe 3 through the third pipeline 12, the second pipeline 10 and the first pipeline 4, the gas extraction pipe 3 is cleaned and impacts the coal seam 1, the coal body crack is developed and expanded, and the pulse frequency of the pulse magnetized water is controlled to be 0.05 Hz-0.3Hz, the pulsating pressure is 12MPa to 18MPa, and the pulsating time is 30min to 45 min;
B. after the injection of the pulse magnetized water is finished, closing the magnetized water generator 14, the pulse pump 11, the first valve 9 and the second valve 13 in sequence;
C. opening a fifth valve 23, a fourth valve 20 and a third valve 16, starting a nitrogen pressurization device 17 and a nitrogen making machine 24 in sequence to obtain high-pressure nitrogen, wherein the pressure of the high-pressure nitrogen is 2.5-5 MPa, the high-pressure nitrogen enters a gas extraction pipe 3 through a sixth pipeline 22, a fifth pipeline 19, a fourth pipeline 15 and a first pipeline 4, and when the gas pressure measuring device 42 shows that the air pressure in the gas extraction pipe 3 is 4MPa, closing the nitrogen making machine 24, the nitrogen increasing device 17, the fifth valve 23, the fourth valve 20 and the third valve 16;
D. waiting for a period of time, when the gas pressure measuring device 42 displays that the gas pressure in the gas extraction pipe 3 is less than 3MPa, repeating the step C, ensuring that the pressure in the gas extraction pipe 3 is maintained at 3-4 MPa, and being beneficial to driving the magnetized water into the coal seam by the high-pressure nitrogen, when the value measured by the laser range finder 6 and away from the liquid level of the magnetized water is equal to the length of the gas extraction pipe (namely, indicating that the magnetized water in the ground well 2 has permeated into the coal seam 1), closing the nitrogen generator 24, the nitrogen increasing device 17, the fifth valve 23, the fourth valve 20 and the third valve 16, stopping injecting the high-pressure nitrogen into the ground well 2, and then sealing the ground well for 12-48 hours to enable the magnetized water to be the wet coal to the maximum extent;
E. opening a second liquid nitrogen valve 44 and a first liquid nitrogen valve 41, starting a liquid nitrogen pulse pump 43, enabling liquid nitrogen to enter the gas extraction pipe 3 through a third low-temperature-resistant pipeline 46, a second low-temperature-resistant pipeline 40 and a first low-temperature-resistant pipeline 5 and to be in contact with the coal seam 1, and enabling magnetized water injected into the coal seam 1 to be frozen and expanded in volume when meeting the liquid nitrogen, so that the fracture of the coal body is further expanded and developed;
F. when the value measured by the laser distance meter 6 from the liquid level of the liquid nitrogen is that the length of the gas extraction pipe 3 is subtracted by 2 times of the thickness of the coal seam 1 (namely, the thickness of the coal seam with the amount of the liquid nitrogen injected into the ground well being two times is determined), the liquid nitrogen pulse pump 43, the second liquid nitrogen valve 44 and the first liquid nitrogen valve 41 are closed, and the pulse injection of the liquid nitrogen into the ground well 3 is stopped;
G. the ground well drilling is sealed for 8-16 h, the liquid nitrogen is gasified to generate nitrogen in the time period, the pressure in the ground well drilling 3 is increased, the liquid nitrogen is further facilitated to flow in a coal seam, the magnetized water is further frozen, and the cracking effect of the coal body is improved;
H. after the ground drilling well 2 is sealed, opening an eighth valve 36, a seventh valve 30 and a third valve 16, starting a nitrogen heating device 28 and a nitrogen supercharging device 17, heating nitrogen in a gas extraction pipe after entering the nitrogen heating device 28 from an eleventh pipeline 37 into high-temperature nitrogen, enabling the high-temperature nitrogen to enter the nitrogen supercharging device 17 through the eighth pipeline and a twelfth pipeline for supercharging, injecting the supercharged high-temperature high-pressure nitrogen into the ground drilling well 2 through a fourth pipeline 15 and a first pipeline 4, forming an ultra-large temperature difference effect after the high-temperature high-pressure nitrogen is contacted with frozen coal, further fracturing the coal, and enabling the high-temperature high-pressure gas to fracture the coal;
I. opening a fifth valve 23 and a sixth valve 26, starting a nitrogen making machine 24, allowing nitrogen to enter a nitrogen heating device 28 through a sixth pipeline 22, a seventh pipeline 25 and a ninth pipeline 32, and supplementing a high-temperature and high-pressure nitrogen source;
J. the opening degree of the eighth valve 36 is adjusted to be 30% -60%, a good pressure accumulation environment in the ground well drilling is guaranteed, and a part of cooled nitrogen can be discharged in time;
K. when the temperature measured by the temperature measuring device 39 is 160 ℃, closing the eighth valve 36, the seventh valve 30, the third valve 16, the fifth valve 23, the sixth valve 26, the nitrogen heating device 28, the nitrogen supercharging device 17 and the nitrogen making machine 24, and extracting gas after the ground well 2 is sealed for 24 hours;
l, when the flow of the gas extraction pipe 3 is less than 8m3And (4) repeating the steps E to K, performing multiple times of liquid nitrogen freezing and high-temperature and high-pressure nitrogen melting on the coal seam 1 to form an ultra-large temperature difference effect, and finally ensuring large-flow, high-concentration and long-time extraction of the gas of the ground well drilling by increasing the permeability of the coal body.
Further, the temperature of the high-temperature high-pressure nitrogen is 160-240 ℃, and the pressure of the nitrogen is 10-16 MPa; and the cycle times of repeating the steps E to K are 8 to 12.
Claims (3)
1. The large-temperature-difference freeze-thaw cycle system is characterized by comprising a first pipeline (4), a first low-temperature-resistant pipeline (5), a laser range finder (6), a drilling sealing cover (7), a first three-way joint (8), a second pipeline (10), a pulse pump (11), a third pipeline (12), a magnetized water generator (14), a fourth pipeline (15), a nitrogen supercharging device (17), a second three-way joint (18), a fifth pipeline (19), a third three-way joint (21), a sixth pipeline (22), a nitrogen generator (24), a seventh pipeline (25), a nitrogen warming device (28), an eighth pipeline (29), a ninth pipeline (32), a fourth three-way joint (33), a tenth pipeline (35), an eleventh pipeline (37), a liquid nitrogen three-way joint (38), a second low-temperature-resistant pipeline (40), A liquid nitrogen pulse pump (43), a third low temperature resistant pipeline (46) and a liquid nitrogen tank (47), wherein a magnetized water generator (14) is connected with an inlet of a pulse pump (11) through a third pipeline (12), an outlet of the pulse pump (11) is communicated with one port of a first three-way joint (8) through a second pipeline (10), the other two ports of the first three-way joint (8) are respectively communicated with one end of a fourth pipeline (15) and one end of a first pipeline (4), the other end of the fourth pipeline (15) is communicated with an outlet of a nitrogen pressurizing device (17), an inlet of the nitrogen pressurizing device (17) is communicated with one port of a second three-way joint (18) through a twelfth pipeline (48), the other two ports of the second three-way joint (18) are respectively communicated with one end of a fifth pipeline (19) and one end of an eighth pipeline (29), and the other end of the eighth pipeline (29) is communicated with an outlet of the nitrogen pressurizing device (28), the other end of the fifth pipeline (19) is communicated with one port of a third three-way joint (21), the other two ports of the third three-way joint (21) are respectively communicated with one end of a sixth pipeline (22) and one end of a seventh pipeline (25), the other end of the sixth pipeline (22) is communicated with an outlet of a nitrogen generator (24), the other end of the seventh pipeline (25) is communicated with one port of a fourth three-way joint (33), the other two ports of the fourth three-way joint (33) are respectively communicated with one end of a ninth pipeline (32) and one end of a tenth pipeline (35), the other end of the ninth pipeline (32) is communicated with an inlet of a nitrogen temperature raising device (28), the other end of the tenth pipeline (35) is communicated with one port of a liquid nitrogen three-way joint (38), the other two ports of the liquid nitrogen three-way joint (38) are respectively communicated with one end of a first low temperature resistant pipeline (5) and one end of a second low temperature resistant pipeline (40), the other end of the second low-temperature resistant pipeline (40) is communicated with an outlet of a pulse liquid nitrogen pump (43), and an inlet of the pulse liquid nitrogen pump (43) is communicated with a liquid nitrogen tank (47) through a third low-temperature resistant pipeline (46); the drilling sealing cover (7) is fixed at the end of the gas extraction pipe (3) in a sealing mode, the other end of the first pipeline (4) and the other end of the first low-temperature-resistant pipeline (5) penetrate through the drilling sealing cover (7) to extend into the gas extraction pipe (3), and the laser range finder (6) is fixed on the drilling sealing cover (7);
a first valve (9) is arranged on the second pipeline (10), a second valve (13) is arranged on the third pipeline (12), a third valve (16) is arranged on the fourth pipeline (15), a fourth valve (20) is arranged on the fifth pipeline (19), a fifth valve (23) is arranged on the sixth pipeline (22), a sixth valve (26) and a first check valve (27) are arranged on the seventh pipeline (25), the inlet of the first check valve (27) is communicated with the third three-way joint (21), a seventh valve (30) and a second check valve (31) are arranged on the eighth pipeline (29), the inlet of the second check valve (31) is communicated with the nitrogen gas heating device (28), an eighth check valve (36) and a third check valve (34) are arranged on the tenth pipeline (35), the inlet of the third check valve (34) is communicated with the liquid nitrogen three-way joint (38), a first liquid nitrogen valve (41) is arranged on the second low-temperature resistant pipeline (40), a second liquid nitrogen valve (44) and a liquid nitrogen check valve (45) are arranged on the third low temperature resistant pipeline (46), and an inlet of the liquid nitrogen check valve (45) is communicated with a liquid nitrogen tank (47).
2. The large-temperature-difference freeze-thaw cycle system for improving the gas extraction effect of the ground drilling according to claim 1, wherein a temperature measuring device (39) is arranged on the first low-temperature-resistant pipeline (5) between the liquid nitrogen tee joint (38) and the drilling sealing cover (7).
3. The large-temperature-difference freeze-thaw cycle system for improving the gas extraction effect of the ground drilling according to claim 1, wherein a gas pressure measuring device (42) is installed on the drilling sealing cover (7).
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| CN112878972B (en) * | 2021-01-19 | 2022-09-20 | 中国石油大学(北京) | Liquid nitrogen pulse fracturing system and fracturing method |
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| US9605513B1 (en) * | 2015-09-04 | 2017-03-28 | John Edward Vandigriff | Method of gas, oil and mineral production using a clean processing system and method |
| CN207073410U (en) * | 2017-05-09 | 2018-03-06 | 河南理工大学 | The anti-reflection system of injection hot water and liquid nitrogen is circulated to coal seam |
| CN107762473B (en) * | 2017-09-28 | 2019-07-02 | 徐州工程学院 | A kind of method of liquid nitrogen and high temperature nitrogen Frozen-thawed cycled increase coal body gas permeability |
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Application publication date: 20190412 Assignee: XUZHOU XINNANHU TECHNOLOGY Co.,Ltd. Assignor: XUZHOU University OF TECHNOLOGY Contract record no.: X2023320000185 Denomination of invention: A large temperature difference freeze-thaw circulation system for improving the gas extraction efficiency of surface drilling Granted publication date: 20201030 License type: Common License Record date: 20230731 |