CN111720058A - Hydrodynamic reaming device and method - Google Patents
Hydrodynamic reaming device and method Download PDFInfo
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- CN111720058A CN111720058A CN202010744642.8A CN202010744642A CN111720058A CN 111720058 A CN111720058 A CN 111720058A CN 202010744642 A CN202010744642 A CN 202010744642A CN 111720058 A CN111720058 A CN 111720058A
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- reaming
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- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000005553 drilling Methods 0.000 claims abstract description 37
- 239000003245 coal Substances 0.000 claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000007769 metal material Substances 0.000 claims abstract description 7
- 239000011435 rock Substances 0.000 claims description 8
- 238000000605 extraction Methods 0.000 claims description 5
- 229910003460 diamond Inorganic materials 0.000 claims description 4
- 239000010432 diamond Substances 0.000 claims description 4
- 238000005065 mining Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 2
- 230000001970 hydrokinetic effect Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 description 4
- 230000002349 favourable effect Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910004534 SiMn Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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Classifications
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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
- E21B10/00—Drill bits
- E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
- E21B10/32—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools
- E21B10/322—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools cutter shifted by fluid pressure
-
- 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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/18—Drilling by liquid or gas jets, with or without entrained pellets
-
- 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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/28—Enlarging drilled holes, e.g. by counterboring
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
Abstract
The invention belongs to the technical field of coal mine drilling, and particularly relates to a hydrodynamic reaming device and a method, wherein the hydrodynamic reaming device comprises a hydraulic motor, a reaming base and a drill bit, an output shaft of the hydraulic motor is provided with a water outlet, one end of the reaming base is connected to the output shaft, the other end of the reaming base is connected with the drill bit, one end of the hydraulic motor, which is far away from the reaming base, is communicated with an external high-pressure water source, a flexible reaming chain or a cable is arranged on the reaming base, the flexible reaming chain or the cable is made of high-strength wear-resistant metal materials, a high-pressure hose penetrates through the flexible reaming chain or the cable, a high-pressure water pipeline communicated with the water outlet on the output shaft is arranged in the reaming base, the high-pressure hose is communicated with the high-pressure water pipeline, and. The hydrodynamic reaming device is used for reaming common drilled holes in coal mines, the reliability of the reaming device can be improved, the reaming cost is reduced, and the reaming efficiency of the drilled holes in the coal mines is guaranteed.
Description
Technical Field
The invention belongs to the technical field of coal mine drilling, and particularly relates to a hydrodynamic reaming device and a hydrodynamic reaming method.
Background
Before coal mine collection, a hole needs to be drilled for gas extraction, a hole needs to be drilled from a rock layer to a coal seam during drilling, and in order to save drilling cost and increase gas extraction efficiency, the hole needs to be reamed under the condition that the hole diameter of a rock layer drilling section is not changed, so that the surface area of an inner hole of the coal seam is enlarged, and the gas overflow efficiency is improved.
Chinese patent document CN201810392039.0 discloses a soil layer variable diameter mechanical reaming bit and a drilling method using the same, wherein torque is transmitted through the bit and a transmission rod, and a reaming telescopic arm is folded when the bit is not stressed, so that small diameter drilling can be conveniently performed; when the reamer enters the bottom of the hole, pressure is applied through the transmission rod, the reaming telescopic arm is outwards opened, and the second connecting rod inlaid with the alloy particles 5 is used as the reaming arm to cut the wall of the hole after rotating along with the transmission rod to form reaming. The diameter of the reaming hole can be adjusted by controlling the telescopic length of the reducing control rod. After the reaming section is constructed, the whole body retreats backwards, the two opened connecting rods automatically fold and straighten under the friction action of the hole wall, and the whole diameter is reduced, so that the hole can be smoothly retreated out of the hole from the non-reaming section. There is the reaming bit that drives the reaming arm through hydraulic support and stretches out and draws back on the market, but among the prior art, the reaming effect is not ideal in setting up of reaming arm, the drilling rod leans on motor drive, the rotational speed reaches 500r/min, the stress impact that the connecting portion of reaming arm and drilling rod received at the reaming in-process is great, easy fatigue damage, and when reaming arm shrink easily and between the drilling rod centre gripping bold coal grain, lead to the shrink not in place, the influence moves back to bore, increase the reaming cost, and can't guarantee the reaming efficiency of construction of drilling.
Therefore, a new hydrodynamic reaming device and method are needed to improve the reliability of the reaming device, reduce the reaming cost and ensure the reaming efficiency of coal mine drilling.
Disclosure of Invention
In order to solve the technical problem, the invention provides a hydrodynamic reaming device, which comprises a hydraulic motor, a reaming base and a drill bit, wherein an output shaft of the hydraulic motor is provided with a water outlet, one end of the reaming base is connected to the output shaft, the other end of the reaming base is connected with the drill bit, one end of the hydraulic motor, which is far away from the reaming base, is communicated with an external high-pressure water source, a flexible reaming chain or a cable is arranged on the reaming base, the flexible reaming chain or the cable is made of high-strength wear-resistant metal materials, high-pressure hoses are arranged in the flexible reaming chain or the cable in a penetrating manner, the cable is made of a plurality of strands of steel wires made of wear-resistant alloy steel materials, which are stranded outside the high-pressure hoses, a high-pressure water pipeline communicated with the water outlet on the output shaft is arranged in the reaming base, the outer surface of the reaming seat is provided with a spiral guide chute, so that broken coal particles can be conveniently conveyed out of a drilled hole in time during reaming, and the reaming efficiency is ensured.
Preferably, the flexible reaming chain adopts a mining high-strength round-link chain, the freedom degree of each chain link of the mining high-strength round-link chain is high, the problem of coal accumulation between the mining high-strength round-link chain and the reaming base can be avoided, and a high-pressure hose is conveniently penetrated.
Preferably, the high-pressure hose is an armored metal hose, so that the service life of the high-pressure hose is guaranteed.
Preferably, the reaming seat is provided with assorted concave-convex connecting part corresponding to the connecting end of the drill bit, and the reaming seat is fixedly connected with the concave-convex connecting part of the drill bit through a bolt, so that the reliability of connection of the drill bit is ensured.
Preferably, the high-strength wear-resistant metal material is 27SiMn material, so that the strength is high, the wear resistance is good, and the service life of the device is prolonged.
Preferably, still be equipped with the diamond compact piece on flexible reaming chain or the cable, be favorable to prolonging the life of flexible reaming chain or cable to improve reaming efficiency. Set up the one end that flexible reaming chain or cable kept away from the reaming seat with the diamond compact piece, be favorable to reducing device manufacturing cost to guarantee reaming efficiency.
Preferably, flexible reaming chain or cable is provided with three circles along reaming seat axial interval, and every circle is equipped with two flexible reaming chains or cables, is favorable to guaranteeing reaming efficiency to increase the stability and the reliability of device.
Preferably, the reaming radii of the three turns of flexible reaming chain or cable are 100mm, 200mm and 250mm respectively, the smaller the reaming radius the closer the flexible reaming chain or cable is to the drill bit. The purpose of drilling forward and gradually expanding the drilled hole can be achieved, and the reaming efficiency is improved.
As another aspect of the present invention, the present invention further provides a reaming method based on the above hydrodynamic reaming device, including the following steps:
1) drilling and positioning: measuring and setting out according to the coal seam condition to position the drilling hole;
2) drilling: firstly, drilling a common drill hole in a coal seam through a rock layer by using a common gas extraction drilling machine, stopping drilling after the depth of the common drill hole reaches a designed position, and withdrawing a common drill bit;
3) reaming: the method comprises the steps of enabling a reaming seat of the hydrodynamic reaming device to penetrate through a rock layer along a common drill hole to be placed into a coal seam, starting a hydraulic motor, driving the reaming seat and a drill bit to rotate at a rotating speed of 120r/min, enabling a flexible reaming chain or a cable to swing under the action of inertia, enabling the flexible reaming chain or the cable to be enhanced in rigidity under the expansion and stretching action of a high-pressure water pipe, synchronously carrying out hydraulic cutting on the coal seam through high-pressure water, achieving efficient reaming of the coal seam, stopping reaming after a reaming aperture reaches a designed value, stopping the hydraulic motor to work, and withdrawing the hydrodynamic reaming device after a high-pressure hose is decompressed.
The present invention also includes other components or steps that enable the proper use of the hydrodynamic reaming apparatus and method, all as is conventional in the art, and further, the apparatus, components or steps not specifically defined herein are all as is conventional in the art. The hydraulic motor according to the present invention may adopt a specific structure of a micro-hydraulic motor disclosed in chinese patent document CN 201246259.
According to the hydrodynamic reaming device, the hydraulic motor drives the reaming base and the drill bit to rotate, the drill bit achieves the purpose of deepening a drilled hole, the flexible reaming chain or the cable connected to the periphery of the reaming base is swung when the reaming base rotates, flexible striking is achieved on a coal bed in the drilled hole, the purpose of flexible reaming is achieved, in order to guarantee rigidity of the flexible reaming chain or the cable, high-pressure hoses penetrate through the flexible reaming chain or the cable, high-pressure water is introduced into the high-pressure hoses through high-pressure water channels in the reaming base, the high-pressure hoses are expanded and hardened, the flexible reaming chain or the cable can be rapidly stretched and the rigidity is enhanced, accordingly, reaming efficiency is improved, one end, far away from the reaming base, of the high-pressure hoses is arranged in an opening, the high-pressure water is sprayed out from the opening end of the high-pressure hoses, and a hydraulic cutting effect. In order to further ensure the hydraulic cutting effect, the open end of the high-pressure hose can be connected with a high-pressure spray head.
The invention has the advantages that the reaming base and the drill bit are driven by the hydraulic motor, and the flexible reaming chain or the cable is arranged on the reaming base to realize flexible reaming of the coal seam drilling, thereby solving the technical problems that the device is easy to damage and difficult to withdraw during reaming by the reaming arm in the prior art, ensuring the reliability of the device, improving the rigidity of the flexible reaming chain or the cable by arranging the high-pressure hose, assisting hydraulic cutting, greatly improving the reaming efficiency of coal mine drilling and reducing the reaming cost.
Drawings
The invention is further illustrated with reference to the following figures and examples.
Fig. 1 is a schematic view of the overall configuration of the hydrodynamic reaming device of the present invention.
Fig. 2 is a schematic perspective view of the end of the flexible reamer chain of the present invention.
Detailed Description
The present invention will be described more clearly with reference to the accompanying drawings, which are included to illustrate and not to limit the present invention. All other embodiments, which can be obtained by those skilled in the art without any inventive step based on the embodiments of the present invention, should be included in the scope of the present invention.
Example 1
As shown in fig. 1-2, the invention provides a hydrodynamic reaming device, which comprises a hydraulic motor 1, a reaming base 2 and a drill bit 3, wherein an output shaft of the hydraulic motor 1 is provided with a water outlet, one end of the reaming base 2 is connected to the output shaft, the other end of the reaming base 2 is connected with the drill bit 3, one end of the hydraulic motor 1, which is far away from the reaming base 2, is communicated with an external high-pressure water source, the reaming base 2 is provided with a flexible reaming chain 4, the flexible reaming chain 4 is made of a high-strength wear-resistant metal material, and the high-strength wear-resistant metal material is 27 SiMn; and all wear to be equipped with high-pressure hose 5 in the flexible reaming chain 4, be equipped with the high pressure water channel 6 that is linked together with the delivery port on the output shaft in the reaming seat 2, high-pressure hose 5 is linked together with high pressure water channel 6, the uncovered setting of one end that reaming seat 2 was kept away from to high-pressure hose 5, reaming seat 2 surface is equipped with spiral baffle box 7, conveniently in time carries out the drilling with broken coal grain when reaming, guarantees reaming efficiency. The connecting end of the reaming base 2 and the drill bit 3 is correspondingly provided with a matched concave-convex connecting part, and the reaming base 2 is fixedly connected with the concave-convex connecting part of the drill bit 3 through a bolt, so that the connection reliability of the drill bit 3 is ensured. One end of the flexible reaming chain 4 far away from the reaming base 2 is provided with a diamond composite sheet 8, so that the service life of the flexible reaming chain 4 is prolonged, the manufacturing cost of the device is reduced, and the reaming efficiency is improved. Flexible reaming chain 4 is provided with three circles along the axial interval of reaming seat 2, and every circle is equipped with two flexible reaming chains 4, is favorable to guaranteeing reaming efficiency to increase the stability and the reliability of device. The reaming radii of the three rings of flexible reaming chains 4 are respectively 100mm, 200mm and 250mm, and the closer the flexible reaming chains 4 are to the drill bit, the smaller the reaming radii are. The purpose of drilling forward and gradually expanding the drilled hole can be achieved, and the reaming efficiency is improved.
According to the invention, the hydrodynamic reaming device drives the reaming base 2 and the drill bit 3 to rotate through the hydraulic motor 1, the drill bit 3 plays a role of deepening a drilling hole, the flexible reaming chain 4 connected to the periphery of the reaming base 2 is swung when the reaming base 2 rotates, flexible striking is realized on a coal bed in the drilling hole, and therefore the purpose of flexible reaming is achieved, in order to ensure the rigidity of the flexible reaming chain 4, the high-pressure hose 5 penetrates through the flexible reaming chain 4, high-pressure water is introduced into the high-pressure hose 5 through the high-pressure water pipeline 6 in the reaming base 2, the high-pressure hose 5 is expanded and hardened, so that the flexible reaming chain 4 is rapidly extended and the rigidity is enhanced, and therefore the reaming efficiency is improved, the high-pressure hose 5 is arranged away from one end opening of the reaming base 2, the high-pressure water is sprayed out from the opening end of the high-pressure hose 5, and a. To further ensure the hydraulic cutting effect. Thereby further improving the reaming efficiency.
Example 2
As shown in fig. 1 to 2, the present invention further provides a reaming method based on the hydrodynamic reaming device of embodiment 1, including the following steps:
1) drilling and positioning: measuring and setting out according to the coal seam condition to position the drilling hole;
2) drilling: firstly, drilling a common drill hole in a coal seam through a rock layer by using a common gas extraction drilling machine, stopping drilling after the depth of the common drill hole reaches a designed position, and withdrawing a common drill bit;
3) reaming: the reaming seat 2 of the hydrodynamic reaming device penetrates a rock layer along a common drill hole to be placed into a coal bed, the hydraulic motor 1 is started, the driving reaming seat 2 and the drill bit 3 rotate at the rotating speed of 120r/min, the flexible reaming chain 4 is made to swing under the action of inertia, the rigidity of the flexible reaming chain 4 is enhanced under the expansion and stretching action of a high-pressure water pipe, hydraulic cutting is synchronously performed on the coal bed through high-pressure water, efficient reaming of the coal bed is realized, reaming is stopped when the reaming aperture reaches a design value, the hydraulic motor 1 stops working, and after the pressure of the high-pressure hose 5 is relieved, the hydrodynamic reaming device is withdrawn.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the illustrated embodiments.
Claims (9)
1. A hydrodynamic reaming device characterized by: including hydraulic motor, reaming seat and drill bit, be equipped with the delivery port on hydraulic motor's the output shaft, the one end of reaming seat is connected on the output shaft, and the other end is connected with the drill bit, hydraulic motor keeps away from the one end of reaming seat and outside high-pressure water source intercommunication, be equipped with flexible reaming chain or cable on the reaming seat, flexible reaming chain or cable all adopt the wear-resisting metal material of excelling in, and all wear to be equipped with high-pressure hose in flexible reaming chain or the cable, be equipped with the high pressure water channel that is linked together with the delivery port on the output shaft in the reaming seat, high pressure hose is linked together with high pressure water channel, the open setting in one end of reaming seat is kept away from to.
2. The hydrodynamic reaming device of claim 1, wherein: the flexible reaming chain is a mining high-strength round-link chain.
3. The hydrodynamic reaming device of claim 1, wherein: the high-pressure hose is an armored metal hose.
4. The hydrodynamic reaming device of claim 1, wherein: the reaming seat is provided with assorted concave-convex connecting part corresponding to the connecting end of the drill bit, and the reaming seat is fixedly connected with the concave-convex connecting part of the drill bit through a bolt.
5. The hydrodynamic reaming device of claim 1, wherein: the high-strength wear-resistant metal material is a 27SiMn material.
6. The hydrodynamic reaming device of claim 1, wherein: and a diamond compact is also arranged on the flexible reaming chain or the cable.
7. The hydrodynamic reaming device of claim 1, wherein: the flexible reaming chains or cables are axially arranged in three circles at intervals along the reaming base, and each circle is provided with two flexible reaming chains or cables.
8. The hydrodynamic reaming device of claim 7, wherein: the reaming radii of the three turns of flexible reaming chains or cables are 100mm, 200mm and 250mm, respectively, the closer the flexible reaming chains or cables are to the drill bit, the smaller the reaming radii are.
9. A method of reaming a hydrokinetic reaming device according to any one of claims 1 to 8, comprising the steps of:
1) drilling and positioning: measuring and setting out according to the coal seam condition to position the drilling hole;
2) drilling: firstly, drilling a common drill hole in a coal seam through a rock layer by using a common gas extraction drilling machine, stopping drilling after the depth of the common drill hole reaches a designed position, and withdrawing a common drill bit;
3) reaming: the method comprises the steps of enabling a reaming seat of the hydrodynamic reaming device to penetrate through a rock layer along a common drill hole to be placed into a coal seam, starting a hydraulic motor, driving the reaming seat and a drill bit to rotate at a rotating speed of 120r/min, enabling a flexible reaming chain or a cable to swing under the action of inertia, enabling the flexible reaming chain or the cable to be enhanced in rigidity under the expansion and stretching action of a high-pressure water pipe, synchronously carrying out hydraulic cutting on the coal seam through high-pressure water, achieving efficient reaming of the coal seam, stopping reaming after a reaming aperture reaches a designed value, stopping the hydraulic motor to work, and withdrawing the hydrodynamic reaming device after a high-pressure hose is decompressed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010744642.8A CN111720058A (en) | 2020-07-29 | 2020-07-29 | Hydrodynamic reaming device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010744642.8A CN111720058A (en) | 2020-07-29 | 2020-07-29 | Hydrodynamic reaming device and method |
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| CN111720058A true CN111720058A (en) | 2020-09-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010744642.8A Pending CN111720058A (en) | 2020-07-29 | 2020-07-29 | Hydrodynamic reaming device and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112593912A (en) * | 2020-12-14 | 2021-04-02 | 山西晋城无烟煤矿业集团有限责任公司 | Coal bed gas horizontal well power expanding, pressure relief and permeability increase extraction method |
| CN114233290A (en) * | 2021-12-17 | 2022-03-25 | 河南理工大学 | Coal breaking, pressure relief and permeability increasing device and method for hydrodynamic flexible cutter |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1427528A (en) * | 1972-11-20 | 1976-03-10 | Reader Sons Ltd E | Device for making under-reams for ground anchors |
| CN2202796Y (en) * | 1993-08-01 | 1995-07-05 | 李长仁 | Flexible reaming drill bit |
| WO2001077445A1 (en) * | 2000-04-11 | 2001-10-18 | Stump Spezialtiefbau Gmbh | Method and device for the production of back-cut cavities |
| CN102561311A (en) * | 2012-02-17 | 2012-07-11 | 苏州市能工基础工程有限责任公司 | Multifunctional high-pressure rotary ejecting step-reaming bit |
| CN212642601U (en) * | 2020-07-29 | 2021-03-02 | 河南理工大学 | Hydrodynamic reaming device |
-
2020
- 2020-07-29 CN CN202010744642.8A patent/CN111720058A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1427528A (en) * | 1972-11-20 | 1976-03-10 | Reader Sons Ltd E | Device for making under-reams for ground anchors |
| CN2202796Y (en) * | 1993-08-01 | 1995-07-05 | 李长仁 | Flexible reaming drill bit |
| WO2001077445A1 (en) * | 2000-04-11 | 2001-10-18 | Stump Spezialtiefbau Gmbh | Method and device for the production of back-cut cavities |
| CN102561311A (en) * | 2012-02-17 | 2012-07-11 | 苏州市能工基础工程有限责任公司 | Multifunctional high-pressure rotary ejecting step-reaming bit |
| CN212642601U (en) * | 2020-07-29 | 2021-03-02 | 河南理工大学 | Hydrodynamic reaming device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112593912A (en) * | 2020-12-14 | 2021-04-02 | 山西晋城无烟煤矿业集团有限责任公司 | Coal bed gas horizontal well power expanding, pressure relief and permeability increase extraction method |
| CN112593912B (en) * | 2020-12-14 | 2022-05-17 | 山西晋城无烟煤矿业集团有限责任公司 | Coal bed gas horizontal well power expanding, pressure relief and permeability increase extraction method |
| CN114233290A (en) * | 2021-12-17 | 2022-03-25 | 河南理工大学 | Coal breaking, pressure relief and permeability increasing device and method for hydrodynamic flexible cutter |
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