CN111255381A - Comprehensive permeability increasing device for coal bed mechanical reaming and hydraulic slotting - Google Patents
Comprehensive permeability increasing device for coal bed mechanical reaming and hydraulic slotting Download PDFInfo
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- CN111255381A CN111255381A CN202010147790.1A CN202010147790A CN111255381A CN 111255381 A CN111255381 A CN 111255381A CN 202010147790 A CN202010147790 A CN 202010147790A CN 111255381 A CN111255381 A CN 111255381A
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- 239000003245 coal Substances 0.000 title claims abstract description 24
- 230000035699 permeability Effects 0.000 title claims abstract description 19
- 230000007246 mechanism Effects 0.000 claims abstract description 50
- 238000005553 drilling Methods 0.000 claims abstract description 21
- 238000006243 chemical reaction Methods 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 35
- 230000008901 benefit Effects 0.000 abstract description 11
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000005065 mining Methods 0.000 abstract description 3
- 230000010354 integration Effects 0.000 abstract description 2
- 238000001816 cooling Methods 0.000 description 4
- 238000000605 extraction Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 210000004907 gland Anatomy 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- 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
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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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- 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 relates to a coal seam mechanical reaming and hydraulic slotting combined comprehensive permeability increasing device, which belongs to the technical field of coal mining and coal mine safety and comprises a drilling mechanism, a mechanical reaming mechanism and a high-low pressure switching mechanism; the drilling mechanism comprises a drill bit and an outer pipe; the mechanical reaming mechanism comprises a plunger, a mechanical reaming blade and a high-pressure jet flow channel arranged in the mechanical reaming blade and the plunger, the plunger is connected with the outer tube in a sliding manner, and the plunger is provided with an eccentric hole; the high-low pressure conversion mechanism comprises an inner cylinder body, a low-pressure water channel is arranged on the inner cylinder body, a mandrel and a piston are connected in the inner cylinder body in a sliding mode, the mandrel is connected with a plunger, and a high-pressure jet flow channel is arranged in the mandrel and communicated with the high-pressure jet flow channel of the plunger. The invention realizes the organic integration of the mechanical reaming and hydraulic slotting permeability-increasing technologies, exerts the technical advantages of the mechanical reaming and hydraulic slotting and realizes the advantage complementation.
Description
Technical Field
The invention belongs to the technical field of coal mining and coal mine safety, and relates to a coal bed mechanical reaming and hydraulic slotting combined comprehensive permeability increasing device.
Background
Coal is the cornerstone of energy in China. However, the permeability of most coal seams mined in China is low, and the difficulty of gas extraction is further increased along with the increase of mining depth. The gas extraction is the key for restricting the safe and efficient production of coal mines, and the difficult problem of gas extraction of low-permeability and difficult-to-extract coal seams needs to be overcome urgently.
The structural modification of the coal-rock mass is the key for solving the problem of gas extraction of the low-permeability coal seam. Mechanical reaming and hydraulic seam making measures are the most practical coal and rock mass structure modification way at present. The hole diameter of the drill hole can be expanded in a preset coal seam section through mechanical reaming, the reaming section can be axially unlimited, the whole drill hole can be reamed, and sufficient pressure relief and permeability increase can be performed in the axial direction; the hydraulic cutting seam can cut a larger ring surface in the radial range, and the pressure is fully released and the permeability is increased in the radial direction.
However, the axial influence range of the mechanical reaming is wide, and the radial anti-reflection effect is not obvious; the hydraulic slotting has sufficient local pressure relief and small axial influence range. At the present stage, equipment for organically integrating mechanical reaming and hydraulic slotting, exerting respective advantages and overcoming the defects is lacked.
Disclosure of Invention
In view of the above, the invention aims to provide a comprehensive permeability increasing device combining coal seam mechanical reaming and hydraulic cutting, which integrates mechanical reaming and high-pressure hydraulic cutting on a set of device, and exerts the technical advantages of mechanical reaming and high-pressure hydraulic cutting permeability increasing so as to solve the problem that the existing mechanical reaming permeability increasing and hydraulic cutting permeability increasing belong to two technologies and cannot realize advantage complementation.
In order to achieve the purpose, the invention provides the following technical scheme:
a coal seam mechanical reaming and hydraulic slotting combined comprehensive permeability increasing device comprises a drilling mechanism, a mechanical reaming mechanism and a high-low pressure conversion mechanism, wherein the mechanical reaming mechanism and the high-low pressure conversion mechanism are arranged in a drill rod;
the drilling mechanism comprises a drill bit and an outer pipe;
the mechanical reaming mechanism comprises a plunger, mechanical reaming blades hinged to two sides of the plunger and a high-pressure jet flow channel arranged in the mechanical reaming blades and the plunger, the plunger is connected with the outer pipe in a sliding manner, and the plunger is further provided with an eccentric hole for low-pressure water to pass through;
the high-low pressure conversion mechanism comprises an inner cylinder body, a low-pressure water channel is arranged on the inner cylinder body, a mandrel and a piston are connected in the inner cylinder body in a sliding mode, the mandrel is connected with a plunger, and a high-pressure jet flow channel is arranged in the mandrel and is communicated with the high-pressure jet flow channel of the plunger; when the water pressure rises, the piston and the mandrel slide in the inner cylinder body, so that a low-pressure water channel is closed, water flows out of the high-pressure jet channel, and high-pressure hydraulic slotting is performed;
further, in the mechanical reaming device, the mechanical reaming blade is connected with the outer pipe of the drilling mechanism through a first pin and is connected with the plunger through a second pin; the first pin is fixed in the drill rod, and a first pin slideway is formed on the mechanical reaming blade and used for limiting the opening and closing path of the mechanical reaming blade; and a high-pressure jet flow channel is arranged on the second pin, and the second pin is fixedly connected with the plunger.
Further, a spring for recovering the mechanical reaming blade is arranged inside the high-low pressure conversion mechanism and is connected with the plunger.
Further, the high-low pressure conversion mechanism is connected with an outer pipe of the drilling mechanism through a fixing pin.
The invention has the beneficial effects that: the invention discloses a comprehensive permeability increasing device for combining mechanical reaming and hydraulic slotting of a coal seam, wherein the opening and closing of a mechanical reaming blade is controlled by a high-low pressure conversion device; the high-pressure jet flow channel arranged on the mechanical reaming blade realizes the organic integration of the mechanical reaming and hydraulic slotting permeability-increasing technologies, exerts the technical advantages of the mechanical reaming and hydraulic slotting and realizes the advantage complementation; through setting up high low pressure conversion equipment, when normally creeping into, sediment and cooling drill bit are arranged through mechanical reaming mechanism's plunger to low pressure water, water pressure increases the back, low pressure water passageway is plugged up to the piston that the water under high pressure promoted high low pressure conversion equipment, and compression spring, open mechanical reaming blade, at this moment, in machinery reaming, the water under high pressure carries out the water conservancy slot through setting up the high pressure jet channel on mechanical reaming blade, water pressure reduces the back, mechanical reaming blade withdraws under the effect of spring, low pressure water passageway is opened, begin normal drilling or move back and bore.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a sectional view taken along line A-A of FIG. 1;
fig. 3 is a schematic structural diagram of the present invention in operation.
1. A drill bit; 2. an outer tube; 30. a mechanical reaming blade; 31. a pin A; 32. a high pressure jet channel; 33. a pin B; 34. a plunger; 35. an eccentric hole; 40. a connector; 41. a gland; 42. a spring sheath; 43. an outer cylinder body; 44. a mandrel; 45. a spring; 46. positioning the shaft sleeve; 47. an inner cylinder body; 48. a piston; 49. a fixing pin; 50. a low pressure water passage; 60. a high pressure jet channel.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
Fig. 1 is a schematic structural diagram of the present invention, fig. 2 is a sectional view taken along line a-a in fig. 1, and fig. 3 is a schematic structural diagram of a combined mechanical reaming and hydraulic cutting apparatus according to the present invention, and as shown in the drawings, the combined permeability increasing apparatus for coal seam mechanical reaming and hydraulic cutting apparatus in this embodiment includes a drilling mechanism that drills to a specified position, a mechanical reaming mechanism disposed inside a drill rod, and a high-low pressure switching mechanism for opening and closing the mechanical reaming apparatus;
the drilling mechanism comprises a drill bit 1 and an outer pipe 2;
the mechanical reaming mechanism can be used for mechanically reaming the drill hole at a preset position, the mechanical reaming mechanism is provided with a high-pressure jet flow channel 32, and high-pressure hydraulic cutting can be performed while the mechanical reaming is performed on the drill hole, so that the reaming permeability increasing and pressure relief influence range is further enlarged;
the high-low pressure conversion device can adjust the opening and closing of the mechanical reaming device through the water pressure, when drilling normally, low-pressure water is used for cooling the drill bit 1 and discharging slag, and high-pressure water opens the mechanical reaming mechanism and performs hydraulic seam cutting.
In this embodiment, the high pressure water jet channel 32 is opened on the mechanical reaming blade 30, and the high pressure water pushes the mechanical reaming blade 30 to open and perform mechanical reaming, and simultaneously, the high pressure water further cuts the coal seam through the high pressure water jet channel 32.
In this embodiment, the plunger 34 of the mechanical reaming mechanism is provided with an eccentric hole 35 and a high-pressure jet channel, when drilling normally, low-pressure water flows through the eccentric hole 34 to remove slag and cool the drill bit, and the high-pressure jet channel 32 is used for cooling the high-pressure slot and the mechanical reaming blade 30.
In this embodiment, the high-low pressure switching mechanism realizes normal drilling when the water pressure is low, and closes the low-pressure water passage after the water pressure rises, and opens the mechanical reaming blade 30.
In this embodiment, a spring 45 for recovering the mechanical reaming blade is arranged inside the high-low pressure conversion mechanism.
In this embodiment, the core shaft 44 of the high-low pressure conversion mechanism is connected to the plunger 34 of the mechanical reaming mechanism, and the core shaft 44 is provided with a high-pressure jet flow channel, which is communicated with the high-pressure jet flow channel of the plunger.
In this embodiment, the inner cylinder 47 of the high-low pressure conversion mechanism is provided with a low-pressure water passage 50, the piston 48 of the high-low pressure conversion mechanism can move up and down in the inner cylinder 47, and when the water pressure rises, the piston 48 blocks the low-pressure water passage 50.
In this embodiment, the mechanical reaming blade 30 is attached to the outer tube of the drilling mechanism by a pin a 31; connected to the plunger 34 by a pin B33.
In this embodiment, the pin a31 is fixed, and the mechanical reamer 30 is provided with a pin a31 slide for limiting the opening and closing path of the mechanical reamer 30.
In this embodiment, the pin B33 is provided with a high-pressure jet passage, and the pin B33 slides up and down together with the plunger 34.
In this embodiment, the high and low pressure switching mechanism is connected to the outer tube 2 of the drilling mechanism by a fixing pin 49.
In this embodiment, the opening and closing of the mechanical reaming blade 30 is controlled by the high-low pressure switching device; and the comprehensive permeability increase of the mechanical reaming and hydraulic slotting is realized through the high-pressure jet flow channel 32 arranged on the mechanical reaming blade 30. When normally drilling, low-pressure water is used for discharging slag and cooling the drill bit through the plunger 34 of the mechanical reaming mechanism, after the water pressure is increased, the high-pressure water pushes the piston 48 of the high-pressure and low-pressure switching mechanism to block a low-pressure water channel, the spring 45 is compressed, the mechanical reaming blade 30 is opened, at the moment, when the mechanical reaming is carried out, the high-pressure water performs hydraulic slotting through the high-pressure jet flow channel 32 arranged on the mechanical reaming blade 30, after the water pressure is reduced, the mechanical reaming blade 30 is withdrawn under the action of the spring 45, the low-pressure water channel 50 is opened, and normal drilling or withdrawal is started.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (4)
1. The utility model provides a coal seam machinery reaming is combined water conservancy slot and is synthesized anti-reflection device which characterized in that: the drilling machine comprises a drilling mechanism, a mechanical hole expanding mechanism and a high-low pressure conversion mechanism, wherein the mechanical hole expanding mechanism and the high-low pressure conversion mechanism are arranged in a drill rod;
the drilling mechanism comprises a drill bit and an outer pipe;
the mechanical reaming mechanism comprises a plunger, mechanical reaming blades hinged to two sides of the plunger and a high-pressure jet flow channel arranged in the mechanical reaming blades and the plunger, the plunger is connected with the outer pipe in a sliding manner, and the plunger is further provided with an eccentric hole for low-pressure water to pass through;
the high-low pressure conversion mechanism comprises an inner cylinder body, a low-pressure water channel is arranged on the inner cylinder body, a mandrel and a piston are connected in the inner cylinder body in a sliding mode, the mandrel is connected with a plunger, and a high-pressure jet flow channel is arranged in the mandrel and is communicated with the high-pressure jet flow channel of the plunger; when the water pressure rises, the piston and the mandrel slide in the inner cylinder body, so that the low-pressure water channel is closed, water flows out of the high-pressure jet flow channel, and high-pressure hydraulic slotting is performed.
2. The coal seam mechanical reaming and hydraulic slotting combined comprehensive permeability increasing device according to claim 1, characterized in that: in the mechanical reaming device, a mechanical reaming blade is connected with the outer pipe of the drilling mechanism through a first pin and is connected with the plunger through a second pin; the first pin is fixed in the drill rod, and a first pin slideway is formed on the mechanical reaming blade and used for limiting the opening and closing path of the mechanical reaming blade; and a high-pressure jet flow channel is arranged on the second pin, and the second pin is fixedly connected with the plunger.
3. The coal seam mechanical reaming and hydraulic slotting combined comprehensive permeability increasing device according to claim 1, characterized in that: and a spring for recovering the mechanical reaming blade is arranged in the high-low pressure conversion mechanism and is connected with the plunger.
4. The coal seam mechanical reaming and hydraulic slotting combined comprehensive permeability increasing device according to claim 1, characterized in that: the high-low pressure conversion mechanism is connected with the outer pipe of the drilling mechanism through a fixing pin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010147790.1A CN111255381A (en) | 2020-03-05 | 2020-03-05 | Comprehensive permeability increasing device for coal bed mechanical reaming and hydraulic slotting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010147790.1A CN111255381A (en) | 2020-03-05 | 2020-03-05 | Comprehensive permeability increasing device for coal bed mechanical reaming and hydraulic slotting |
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| Publication Number | Publication Date |
|---|---|
| CN111255381A true CN111255381A (en) | 2020-06-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010147790.1A Pending CN111255381A (en) | 2020-03-05 | 2020-03-05 | Comprehensive permeability increasing device for coal bed mechanical reaming and hydraulic slotting |
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| CN (1) | CN111255381A (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111691825A (en) * | 2020-07-29 | 2020-09-22 | 河南理工大学 | Flexible reaming bit |
| CN111779455A (en) * | 2020-07-29 | 2020-10-16 | 河南理工大学 | Swinging chain for reamer bit |
| CN112179702A (en) * | 2020-08-25 | 2021-01-05 | 徐州市苏文机械设备制造有限公司 | Fixed point coal sample taking device |
| CN112196467A (en) * | 2020-08-25 | 2021-01-08 | 徐州市苏文机械设备制造有限公司 | Mechanical reaming device |
| CN112343513A (en) * | 2020-11-05 | 2021-02-09 | 辽宁煤科矿业产品制造有限公司 | Mechanical and hydraulic integrated reaming bit for coal bed and reaming process |
| CN112610198A (en) * | 2020-12-17 | 2021-04-06 | 中国矿业大学 | Coal seam mechanical fracturing and hydraulic drive cooperative targeting fracturing device and method |
| CN112832729A (en) * | 2020-12-31 | 2021-05-25 | 煤科集团沈阳研究院有限公司 | Hydraulic mechanical hole making device, using method and hole making process |
| CN113107582A (en) * | 2021-05-18 | 2021-07-13 | 铁福来装备制造集团股份有限公司 | Pressure-relief permeability-increasing construction system for coal seam |
| CN113846971A (en) * | 2021-09-29 | 2021-12-28 | 河南能源化工集团研究总院有限公司 | Mechanical hydraulic drilling and cave-making integrated device and operation method |
| CN114033312A (en) * | 2021-11-23 | 2022-02-11 | 河南理工大学 | Hydraulic combined mechanical reaming and permeability increasing device and method |
| WO2022118038A1 (en) * | 2020-12-04 | 2022-06-09 | HRG Well Solutions Limited | Annulus remediation system and method |
| CN114961589A (en) * | 2022-05-26 | 2022-08-30 | 中国矿业大学 | Spring pin graded control type mechanical hole making drill bit and hole making method thereof |
| CN116906020A (en) * | 2023-08-31 | 2023-10-20 | 徐州工程学院 | Shale gas yield increasing equipment and yield increasing method |
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Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111691825A (en) * | 2020-07-29 | 2020-09-22 | 河南理工大学 | Flexible reaming bit |
| CN111779455A (en) * | 2020-07-29 | 2020-10-16 | 河南理工大学 | Swinging chain for reamer bit |
| CN112179702A (en) * | 2020-08-25 | 2021-01-05 | 徐州市苏文机械设备制造有限公司 | Fixed point coal sample taking device |
| CN112196467A (en) * | 2020-08-25 | 2021-01-08 | 徐州市苏文机械设备制造有限公司 | Mechanical reaming device |
| CN112343513A (en) * | 2020-11-05 | 2021-02-09 | 辽宁煤科矿业产品制造有限公司 | Mechanical and hydraulic integrated reaming bit for coal bed and reaming process |
| GB2603616B (en) * | 2020-12-04 | 2023-03-08 | Hrg Well Solutions Ltd | Annulus remediation system and method |
| WO2022118038A1 (en) * | 2020-12-04 | 2022-06-09 | HRG Well Solutions Limited | Annulus remediation system and method |
| GB2603616A (en) * | 2020-12-04 | 2022-08-10 | Hrg Well Solutions Ltd | Annulus remediation system and method |
| CN112610198A (en) * | 2020-12-17 | 2021-04-06 | 中国矿业大学 | Coal seam mechanical fracturing and hydraulic drive cooperative targeting fracturing device and method |
| WO2022142275A1 (en) * | 2020-12-31 | 2022-07-07 | 中煤科工集团沈阳研究院有限公司 | Hydraulic mechanical hole-making device, method for using same, and hole-making process |
| JP2023501858A (en) * | 2020-12-31 | 2023-01-20 | 中煤科工集団沈陽研究院有限公司 | Hydro-mechanical drilling equipment, method of use and drilling process |
| CN112832729A (en) * | 2020-12-31 | 2021-05-25 | 煤科集团沈阳研究院有限公司 | Hydraulic mechanical hole making device, using method and hole making process |
| JP7261354B2 (en) | 2020-12-31 | 2023-04-19 | 中煤科工集団沈陽研究院有限公司 | Hydro-mechanical drilling equipment, method of use and drilling process |
| CN113107582A (en) * | 2021-05-18 | 2021-07-13 | 铁福来装备制造集团股份有限公司 | Pressure-relief permeability-increasing construction system for coal seam |
| CN113846971A (en) * | 2021-09-29 | 2021-12-28 | 河南能源化工集团研究总院有限公司 | Mechanical hydraulic drilling and cave-making integrated device and operation method |
| CN113846971B (en) * | 2021-09-29 | 2024-03-29 | 河南能源化工集团研究总院有限公司 | Mechanical hydraulic drilling and hole-making integrated device and operation method |
| CN114033312A (en) * | 2021-11-23 | 2022-02-11 | 河南理工大学 | Hydraulic combined mechanical reaming and permeability increasing device and method |
| CN114961589A (en) * | 2022-05-26 | 2022-08-30 | 中国矿业大学 | Spring pin graded control type mechanical hole making drill bit and hole making method thereof |
| CN114961589B (en) * | 2022-05-26 | 2023-03-14 | 中国矿业大学 | Spring pin graded control type mechanical hole making drill bit and hole making method thereof |
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| CN116906020B (en) * | 2023-08-31 | 2024-01-26 | 徐州工程学院 | Shale gas yield increasing method |
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Application publication date: 20200609 |