CN113202452B - Drilling, punching and protecting integrated coal seam drilling hydraulic cave making device and cave making method - Google Patents
Drilling, punching and protecting integrated coal seam drilling hydraulic cave making device and cave making method Download PDFInfo
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- CN113202452B CN113202452B CN202110490818.6A CN202110490818A CN113202452B CN 113202452 B CN113202452 B CN 113202452B CN 202110490818 A CN202110490818 A CN 202110490818A CN 113202452 B CN113202452 B CN 113202452B
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- 238000005553 drilling Methods 0.000 title claims abstract description 98
- 239000003245 coal Substances 0.000 title claims abstract description 48
- 238000004080 punching Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 129
- 238000006243 chemical reaction Methods 0.000 claims abstract description 25
- 238000007789 sealing Methods 0.000 claims description 37
- 238000011010 flushing procedure Methods 0.000 claims description 7
- 238000009434 installation Methods 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 239000005341 toughened glass Substances 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 210000001503 joint Anatomy 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 5
- 238000000605 extraction Methods 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 5
- 239000002817 coal dust Substances 0.000 description 4
- 238000005065 mining Methods 0.000 description 4
- 239000000725 suspension Substances 0.000 description 4
- 206010017076 Fracture Diseases 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 101000793686 Homo sapiens Azurocidin Proteins 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 210000003128 head Anatomy 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011241 protective layer Substances 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
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
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Abstract
The invention discloses a drilling, punching and protecting integrated coal seam drilling hydraulic cave making device and a cave making method, wherein a pipe body is arranged, and a water channel is embedded in the side wall of the pipe body; the pipe body is in shaft joint with a cave-making short joint; a pressure conversion piston assembly is arranged in the pipe body, and the cave-making short section is axially butted and communicated with the pressure conversion piston assembly; water flow pushes the pressure conversion piston assembly to move axially to block the water channel, and formed high-pressure water flow carries out high-pressure water flow hole making at the hole making short joint. The integrated construction of drilling, hydraulic hole making and sieve tube hole protecting is realized, and the hole protecting problem caused by hole collapse after drilling is avoided; the problem of screen pipe is down gone up in the hydraulic power cave drilling tool is solved, the application scope in cave making technique coal seam has been widened, the gas drainage effect of cave making drilling has been improved.
Description
Technical Field
The invention relates to the field of coal mine underground gas extraction drilling hole protection technology and coal and gas treatment engineering, in particular to a drilling and flushing protection integrated coal seam drilling hydraulic cave making device and a cave making method.
Background
Along with the coal mine deep mining in China, the proportion of the broken soft outburst coal seam in the coal mine production is larger and larger, the gas control problem is highlighted day by day, and particularly in a high-gas low-permeability coal seam of a mining area (well) without a protective layer mining condition, the gas extraction assisted by an anti-reflection measure is the most widely and effectively gas control means at present. The hydraulic punching technology is characterized in that high-pressure water jet is utilized to impact and break coal bodies in a drill hole, a large amount of coal and gas are discharged, holes with large diameters are formed in a coal layer, and primary fractures of the coal bodies around a cavity are expanded and new fractures are generated under the stress action, so that the purposes of pressure relief, permeability increase and extraction enhancement are achieved. The method has the remarkable advantages of simple construction operation, high cost performance, obvious anti-reflection effect and the like, and is strong in popularization. In recent years, a large number of tests and applications of the hydraulic punching technology are carried out in various coal mining areas in China, such as rock cross-cut coal uncovering in Shuihuai, henan, shanxi and the like, the coal seam and cross-layer drilling pressure relief and permeability increase. At present, the open hole extraction is generally adopted after the hydraulic punching is finished, a coal seam is generally broken and easy to collapse, the extraction effect is greatly influenced, the existing hydraulic punching technology cannot realize direct hole protection after punching, and the screen pipe hole protection extraction is difficult to insert into the open hole after the drilling is lifted, so that the hydraulic punching and hole protection integrated hydraulic punching finishing technology needs to be further researched, and the gas extraction after punching is ensured.
The prior art has the following defects:
the existing hydraulic hole making drilling tool and the existing mechanical hole making drilling tool are limited in structure and have no hollow inner channel, so that the situation that after hole making is finished, a sieve tube is sent into a hole from a drill rod without lifting drilling, and after hole lifting drilling, the sieve tube is difficult to put into the hole with naked eyes due to the fact that hole collapse is easy to occur at a hole making section, and therefore, the existing hole making drilling is generally extracted with the naked eyes.
Disclosure of Invention
The invention aims to provide a drilling, punching and protecting integrated coal seam drilling hydraulic cave making device and a cave making method, and overcomes the technical defect that a hole protecting sieve pipe cannot be put into a hole without lifting after hydraulic punching cave making in the prior art.
In order to solve the problems, the technical scheme adopted by the invention comprises the following steps:
a drilling, punching and protecting integrated coal seam drilling hydraulic cave making device is provided with a pipe body, wherein a water channel is embedded in the side wall of the pipe body; the pipe body is in shaft joint with a cave-making short joint; a pressure conversion piston assembly is arranged in the pipe body, and the cave-making short section is axially butted and communicated with the pressure conversion piston assembly; water flow pushes the pressure conversion piston assembly to move axially to block the water channel, and formed high-pressure water flow carries out high-pressure water flow hole making at the hole making short joint.
Optionally, the pressure conversion piston assembly comprises a sealing pressure-bearing body, a piston body and a reset elastic piece which are sequentially arranged along the flow direction of water flow; water flow sequentially pushes the sealing pressure-bearing body and the piston body to compress the elastic resetting piece, the piston body is axially moved to block a water channel, and formed high-pressure water flow is used for high-pressure water flow hole making at the hole making short joint.
Optionally, the sealing pressure-bearing body is a wafer made of tempered glass; the reset elastic piece is a rectangular spring.
Optionally, the pressure conversion piston assembly further comprises a piston end cover arranged upstream of the piston body; the piston end cover is of a tubular joint structure, and the sealing pressure-bearing body is arranged between the piston end cover and the piston body in a sealing and pressing mode.
Optionally, the piston body is of a tubular structure; the piston body sets up uide bushing and first sealing washer outward.
Optionally, the water channel is communicated with, a water inlet is arranged on the pipe body close to the installation end of the cave-making short section, a water outlet is arranged at the other end of the pipe body, and the water outlet is arranged in the axial movement range of the piston body.
Optionally, a drain hole is further provided on the pipe body downstream of the water outlet hole.
Optionally, the cave-making short section is of a tubular structure; one end of the cave-making short section extends into the pipe body to be axially butted and communicated with the pressure conversion piston assembly, and a water through groove is formed at the end; the upper stream of the cave-making short joint is provided with a high-pressure nozzle hole.
The invention discloses a drilling, punching and protecting integrated coal seam drilling hydraulic cave making method, which is operated by adopting the drilling, punching and protecting integrated coal seam drilling hydraulic cave making device and specifically comprises the following steps:
the first step is as follows: the drill bit capable of being opened and closed, the drilling and punching integrated coal seam drilling hydraulic hole making device, the large-drift-diameter high-pressure sealing drill rod and the water pump are sequentially connected to perform non-hole making drilling hole making, the pressure of the water pump is adjusted to be not higher than 3MPa at the moment, the drill bit can be opened and closed to form a hole in a rotating mode, and water flow from the water pump flows to the drill bit through the water channel to cool and punch the hole;
the second step: drilling to a preset hole-making section, opening hydraulic hole making to enable the pressure of a water pump to be higher than 3MPa, pushing a piston body to axially move by the pressure of water flow to plug a water outlet hole, enabling the water flow to flow out through a high-pressure nozzle hole in a concentrated manner, and quickly increasing the water pressure to perform high-pressure water jet hole making;
the third step: after the hole making is finished, the pump pressure is lowered, the piston body is pushed back to reset by the reset elastic piece, water flows to the drill bit through the water channel, and the second step is repeated when hydraulic hole making is needed;
the fourth step: after drilling and hole making, the drill bit can be opened and closed and the water pump can be closed.
The invention discloses a method for protecting a hole without lifting a sieve tube after punching and cave-making based on a drilling, punching and protecting integrated coal seam drilling hydraulic cave-making device, which is operated by adopting the drilling, punching and protecting integrated coal seam drilling hydraulic cave-making device and specifically comprises the following steps:
one end of the drilling, flushing and protecting integrated coal seam drilling hydraulic cave making device is connected with a drill bit which can be opened and closed, and the other end of the drilling, flushing and protecting integrated coal seam drilling hydraulic cave making device is connected with a large-drift-diameter high-pressure sealing drill rod;
the first step is as follows: the sieve tube impactor, the sieve tube suspension device and the sieve tube are sequentially connected, the sieve tube is pushed into the large-drift-diameter high-pressure sealing drill rod, and after the sieve tube impactor impacts a sealing pressure-bearing body of the crushing, drilling, punching and protecting integrated coal seam drilling hydraulic hole making device, the sieve tube is continuously pushed to the bottom of a hole through the openable drill bit;
the second step is that: after the sieve tube is pushed to the bottom of the hole, the sieve tube suspension device is opened to hang the hole wall, and the drilling tool is lifted out to carry out hole sealing and gas extraction in the sieve tube retention hole.
The invention has the beneficial effects that:
the integrated construction of drilling, hydraulic hole making and sieve tube hole protecting is realized, and the hole protecting problem caused by hole collapse after drilling is avoided; the problem of screen pipe is down gone up in the hydraulic power cave drilling tool is solved, the application scope in cave making technique coal seam has been widened, the gas drainage effect of cave making drilling has been improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
FIG. 1 is a schematic structural diagram of a drilling and punching integrated coal seam drilling hydraulic cave making device of the invention;
1-a cave making short section, 11-a drill rod female joint, 12-a high-pressure nozzle hole, 13-a pipe body male joint and 14-a water through groove;
2-pipe body, 21-drill male joint, 22-water drainage hole, 23-water outlet hole, 24-water channel, 25-water inlet hole, 26-pipe body female joint and 27-plug;
3-pressure conversion piston assembly, 31-reset elastic piece, 32-piston body, 33-guide sleeve, 34-first sealing ring, 35-second sealing ring, 36-sealing pressure-bearing body and 37-piston end cover.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It should be understood that the following embodiments are only a part of the embodiments of the present invention, not all of the embodiments, and are not intended to limit the present invention in any way, and all technical solutions using the embodiments, including simple changes made to the embodiments, belong to the protection scope of the present invention.
In order to achieve the purpose and achieve the technical effect, the invention is realized by the following technical scheme:
with reference to fig. 1, the drilling, punching and protecting integrated coal seam drilling hydraulic cave making device is provided with a pipe body 2, and a water channel 24 is embedded in the side wall of the pipe body 2; the pipe body 2 is provided with a cave-making short joint 1 in a shaft connection way; a pressure conversion piston assembly 3 is arranged in the pipe body 2, and the cave-making short section 1 is axially butted and communicated with the pressure conversion piston assembly 3; water flow pushes the pressure conversion piston assembly 3 to move axially to plug the water channel 24, and formed high-pressure water flow carries out high-pressure water flow hole forming at the hole forming short joint 1. The device of the invention mainly realizes the switching of non-cave-making drilling and hydraulic cave-making reaming by adjusting the water pressure, and realizes the drilling, punching and protecting integrated construction by inserting the hole protecting sieve tube into the inner through hole after the hole is formed.
In the embodiment of the present disclosure, the pressure conversion piston assembly 3 includes a sealing pressure-bearing body 36, a piston body 32 and a return elastic member 31 which are sequentially arranged along the flow direction of water; the water flow pushes the sealing bearing body 36 and the piston body 32 to compress the reset elastic piece 31 in sequence, the water channel 24 is sealed after the piston body 32 moves axially, and the formed high-pressure water flow carries out high-pressure water flow hole forming at the hole forming short joint 1.
Preferably, the sealing pressure-bearing body 36 is a wafer made of toughened glass, so that the sealing pressure-bearing body has better pressure-bearing capacity, and meanwhile, the sieve tube can be lowered after being crushed by the sieve tube impactor, and the component can be replaced and belongs to low-cost consumables; the reset elastic part 31 is a rectangular spring and has better resilience force and certain bearing force.
In the disclosed embodiment, the pressure conversion piston assembly 3 further includes a piston end cap 37 disposed upstream of the piston body 32; the piston end cover 37 is a tubular joint structure, and the sealing pressure-bearing body 36 is arranged between the piston end cover 37 and the piston body 32 in a sealing and pressing mode, so that the cave-making short section 1 is in direct contact with the piston end cover 37, the sealing pressure-bearing body 36 cannot be damaged, and a certain distance is provided for diversion of water flow.
In the disclosed embodiment, piston body 32 is tubular in construction, which not only facilitates water communication and closure of water channels 24, but also permits the passage of a screen, which is also tubular; the piston body 32 is externally provided with a guide sleeve 33 and a first sealing ring 34, and a second sealing ring 35 is also arranged between a sealing pressure-bearing body 36 and the piston body 32, so that the sealing performance inside and outside the pressure conversion piston assembly 3 is improved, and a condition is provided for maintaining water pressure.
In the embodiment of the present disclosure, the water channel 24 is communicated with, the water inlet 25 is disposed on the pipe body 2 near the installation end of the cave-making short section, the water outlet 23 is disposed at the other end of the pipe body 2, and the water outlet 23 is disposed within the axial movement range of the piston body 32. A drain opening 22 is also provided in the pipe body 2 downstream of the water outlet opening 23. The water inlet cross-sectional area of the water inlet hole 25 is larger than the water outlet cross-sectional area of the high-pressure nozzle hole 12, and the water drainage hole 22 is arranged to prevent the drill bit from being washed under the condition that the water outlet hole 23 is blocked, so that the drill bit is prevented from being blocked by coal dust.
In the embodiment of the disclosure, the cave-making short joint 1 is of a tubular structure; one end of the cave-making short joint 1 extends into the pipe body 2 and is axially communicated with the pressure conversion piston assembly 3 in a butt joint mode, and a water passing groove 14 is formed in the end; the upper stream of the cave-making short joint 1 is provided with a high-pressure nozzle hole 12. The high-pressure nozzle hole is used for installing a high-pressure nozzle for cave making, and the water flowing groove is used for distributing and guiding water flow to a water inlet flow channel of the pipe body during cave making and normal drilling.
The pipe body female connector 26 is connected with the pipe body male connector 13; the diameter of the water inlet hole 25 is determined according to the required water flow and throttling pressure; a plurality of water channels 24 are arranged around the circumference, and the drift diameter of each water channel is larger than the diameter of the water inlet 25 water plug; the diameter of the water outlet of the water passing plug of the water outlet hole 23 is not smaller than that of the water inlet of the water passing plug of the water inlet hole 25; the drain hole 22 plug is used for releasing a certain amount of water through the drain plug during cave building so as to prevent the coal dust of the drill bit from being blocked, and the aperture is determined according to the required drain amount during cave building and hole expanding; the male drill joint 21 is connected to a drill, and plugs 27 are provided at both ends of the tube 2.
The drilling, punching and protecting integrated coal seam drilling hydraulic cave building method comprises the following steps:
the drilling, punching and protecting integrated coal seam drilling hydraulic cave building device is adopted for operation, and specifically comprises the following steps:
the first step is as follows: the drill bit capable of being opened and closed, the drilling and punching integrated coal seam drilling hydraulic hole making device, the large-drift-diameter high-pressure sealing drill rod and the water pump are sequentially connected to perform non-hole making drilling hole making, the pressure of the water pump is adjusted to be not higher than 3MPa at the moment, the drill bit can be opened and closed to form a hole in a rotating mode, and water flow from the water pump flows to the drill bit through the water channel 24 to be cooled and punched;
the second step is that: drilling to a preset hole-making section, starting hydraulic hole making to enable the pressure of a water pump to be higher than 3MPa, pushing a piston body 32 to axially move by the pressure of water flow to plug a water outlet hole 23, enabling the water flow to intensively flow out through a high-pressure nozzle hole 12, and quickly increasing the water pressure to perform high-pressure water jet hole making;
the third step: after the cave-making is finished, the pump pressure is lowered, the piston body 32 is pushed back to reset by the reset elastic piece 31, water flows to the drill bit through the water channel 24, and the second step is repeated when hydraulic cave-making is needed;
the fourth step: after drilling and hole making, the drill bit can be opened and closed and the water pump can be closed.
The initial state of the drilling tool is as shown in fig. 1, when water flows through the cave-making short section 1 from the drilling rod, one part of the water is sprayed out through the high-pressure nozzle installed on the high-pressure nozzle hole 12, and when the other part of the water flows through the pressure conversion piston assembly 3, the water can only flow to the drilling head through the water inlet 25, the water channel 24, the water outlet 23 and the water drainage hole 22 because the water is blocked by the sealing pressure-bearing body 36. When the non-cave-making drill is drilled, low-pressure water (less than 3 MPa) is in the drilling tool at the moment, the pressure of the water pressure acting on the pressure conversion piston assembly 3 is small and is not enough to push the piston body 32 and the reset elastic piece 31 to plug the water outlet hole 23, and the total water inlet sectional area of the water inlet hole is far larger than the total water outlet sectional area of the high-pressure nozzle, so most of water flows to the drill bit and is used for cooling the drill bit and flushing discharged rock debris, only a small part of water flows are sprayed out through the nozzle, and the nozzle is prevented from being blocked by coal dust. When hydraulic pressure cave building is needed, water pressure is improved (more than 3 MPa), the thrust of the water pressure acting on the piston body 32 is increased, when the compression reset elastic piece 31 deforms and the piston body 32 moves leftwards to plug the water outlet hole 23, the total water passing section is suddenly reduced, the water quantity is unchanged, the water pressure is rapidly increased, most of water flows are sprayed out through the high-pressure nozzles installed on the high-pressure nozzle holes 12 to perform jet flow cave building, and in addition, a small part of water flows to the drill bit from the water drainage hole 22, so that the drill bit is prevented from being blocked by coal dust.
The invention discloses a method for protecting a hole without lifting a sieve tube after punching and cave-making based on a drilling, punching and cave-making integrated coal seam drilling hydraulic cave-making device, which comprises the following steps:
the drilling, punching and protecting integrated coal seam drilling hydraulic cave building device is adopted for operation, and specifically comprises the following steps:
one end of the drilling, flushing and protecting integrated coal seam drilling hydraulic cave making device is connected with a drill bit which can be opened and closed, and the other end of the drilling, flushing and protecting integrated coal seam drilling hydraulic cave making device is connected with a large-drift-diameter high-pressure sealing drill rod;
the first step is as follows: the sieve tube impactor, the sieve tube suspension device and the sieve tube are sequentially connected, the sieve tube is pushed into the large-drift-diameter high-pressure sealed drill rod, and after the sieve tube impactor impacts the sealing pressure-bearing body 36 of the crushing, drilling, punching and protecting integrated coal seam drilling hydraulic hole making device, the sieve tube is continuously pushed to the bottom of the hole through the openable drill bit;
the second step: after the sieve tube is pushed to the bottom of the hole, the sieve tube suspension device is opened to hang the hole wall, and the drilling tool is lifted out to carry out hole sealing and gas extraction in the sieve tube retention hole.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (5)
1. The drilling, punching and protecting integrated coal seam drilling hydraulic cave building method is characterized in that a drilling, punching and protecting integrated coal seam drilling hydraulic cave building device is adopted for operation, and the method specifically comprises the following steps:
the first step is as follows: the drill bit capable of being opened and closed, the drilling and punching integrated coal seam drilling hydraulic hole making device, the large-drift-diameter high-pressure sealing drill rod and the water pump are sequentially connected to perform non-hole making drilling hole making, the pressure of the water pump is adjusted to be not higher than 3MPa at the moment, the drill bit can be opened and closed to form a hole in a rotating mode, and water flow from the water pump flows to the drill bit through the water channel (24) to be cooled and punched;
the second step is that: drilling to a preset hole-making section, opening hydraulic hole making to enable the pressure of a water pump to be higher than 3MPa, pushing a piston body (32) to axially move by the pressure of water flow to plug a water outlet hole (23), enabling the water flow to intensively flow out through a high-pressure nozzle hole (12), and rapidly increasing the water pressure to perform high-pressure water jet hole making;
the third step: after cave building is finished, the pump pressure is lowered, the piston body (32) is pushed back to reset by the reset elastic piece (31), water flows to the drill bit through the water channel (24), and the second step is repeated when hydraulic cave building is needed;
the fourth step: after drilling and hole making are completed, the drill bit can be opened and closed by repeated flushing and the water pump is turned off;
the drilling, punching and protecting integrated coal seam drilling hydraulic cave building device is provided with a pipe body (2), and a water channel (24) is embedded in the side wall of the pipe body (2); the pipe body (2) is coupled with the cave-making short section (1); a pressure conversion piston assembly (3) is arranged in the pipe body (2), and the cave-making short section (1) is axially butted and communicated with the pressure conversion piston assembly (3); water flow pushes the pressure conversion piston assembly (3) to move axially to block the water channel (24), and formed high-pressure water flow carries out high-pressure water flow hole making at the hole making short joint (1);
the pressure conversion piston assembly (3) comprises a sealing pressure-bearing body (36), a piston body (32) and a reset elastic piece (31) which are sequentially arranged along the flow direction of water flow; the water flow sequentially pushes the sealing pressure-bearing body (36) and the piston body (32) to compress the reset elastic piece (31), the piston body (32) is axially moved to block the water channel (24), and the formed high-pressure water flow carries out high-pressure water flow cave building at the cave building short joint (1);
the pressure conversion piston assembly (3) further comprises a piston end cover (37) arranged at the upstream of the piston body (32); the piston end cover (37) is of a tubular joint structure, and the sealing pressure-bearing body (36) is arranged between the piston end cover (37) and the piston body (32) in a sealing and pressing mode;
and the water channel (24) is communicated, a water inlet hole (25) is formed in the pipe body (2) close to the installation end of the cave-making short section, a water outlet hole (23) is formed in the other end of the pipe body (2), and the water outlet hole (23) is formed in the axial movement range of the piston body (32).
2. The drilling and punching protection integrated coal seam drilling hydraulic cave making method according to claim 1, characterized in that the sealing pressure-bearing body (36) is a round piece made of tempered glass;
the reset elastic piece (31) is a rectangular spring.
3. The drilling and punching protection integrated coal seam drilling hydraulic caving method according to claim 1 or 2, characterized in that the piston body (32) is of a tubular structure;
a guide sleeve (33) and a first sealing ring (34) are arranged outside the piston body (32).
4. The drilling and percussion-protecting integrated coal seam drilling hydraulic caving method according to claim 1 or 2, characterized in that a drain hole (22) is further arranged on the pipe body (2) downstream of the water outlet hole (23).
5. The drilling and punching protection integrated coal seam drilling hydraulic cave making method according to claim 1 or 2, characterized in that the cave making short section (1) is of a tubular structure;
one end of the cave-making short joint (1) extends into the pipe body (2) and is axially communicated with the pressure conversion piston assembly (3) in a butt joint way, and a water passing groove (14) is formed in the end; the upper stream of the cave-making short joint (1) is provided with a high-pressure nozzle hole (12).
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| CN103790524B (en) * | 2014-01-21 | 2015-09-23 | 中国海洋石油总公司 | Surge pressure controls pipe nipple |
| CN105672946B (en) * | 2016-01-20 | 2020-03-24 | 中国石油化工股份有限公司 | Elastic limit type full-bore switch sliding sleeve |
| US10648284B2 (en) * | 2018-03-26 | 2020-05-12 | Comitt Well Solutions LLC | Methods and systems for a seal to maintain constant pressure within a tool with a sliding internal seal |
| CN209261487U (en) * | 2018-10-24 | 2019-08-16 | 山西潞安工程有限公司 | Cave device is made in a kind of conversion of coal mine high-low pressure |
| CN111734378A (en) * | 2020-07-15 | 2020-10-02 | 中国石油集团渤海钻探工程有限公司 | Layered fracturing, testing and mining integrated construction tool and construction method |
| CN111980745B (en) * | 2020-08-07 | 2022-07-22 | 中煤科工集团西安研究院有限公司 | Broken soft low-permeability coal bed gas treatment equipment and method in drilling oriented cave-making permeability-increasing area |
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