CN109958421A - Top relief construction method and drilling machine are cut in a kind of precracking hydraulic fracturing - Google Patents
Top relief construction method and drilling machine are cut in a kind of precracking hydraulic fracturing Download PDFInfo
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- CN109958421A CN109958421A CN201910206420.8A CN201910206420A CN109958421A CN 109958421 A CN109958421 A CN 109958421A CN 201910206420 A CN201910206420 A CN 201910206420A CN 109958421 A CN109958421 A CN 109958421A
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- precracking
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- drill
- drilling
- hydraulic fracturing
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Links
- 238000005553 drilling Methods 0.000 title claims abstract description 43
- 238000010276 construction Methods 0.000 title claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000012528 membrane Substances 0.000 claims abstract description 17
- 239000003245 coal Substances 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 11
- 238000012856 packing Methods 0.000 claims abstract description 9
- 238000005520 cutting process Methods 0.000 claims description 31
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 230000007423 decrease Effects 0.000 claims description 5
- 208000037656 Respiratory Sounds Diseases 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 2
- 238000005336 cracking Methods 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- 239000011435 rock Substances 0.000 abstract description 7
- 238000005516 engineering process Methods 0.000 abstract description 4
- 238000005065 mining Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000004880 explosion Methods 0.000 description 4
- 239000002360 explosive Substances 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000005422 blasting Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 241000135309 Processus Species 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000000505 pernicious effect Effects 0.000 description 1
- 230000037452 priming Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B3/00—Rotary drilling
- E21B3/02—Surface drives for rotary drilling
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
Abstract
The invention discloses a kind of precracking hydraulic fracturings to cut top relief construction method and drilling machine.This method top plate above coal column is constructed groove using special drill along axial direction at regular intervals along certain intervals construction drill；It is inserted into packer and in advance opening rubber membrane, makes groove in packing section and be open to be aligned with groove, then fill the water into packing section, manual pump pressurization packer, whether pressure declines or there are flowing out in observation packing section；High-pressure pump pressure break is connected, prefabricated Fracture orientation hydraulic fracturing is completed and cuts top release operation.By above embodiment, the present invention can effectively reduce roadway surrounding rock stress, controls roadway deformation, improves the safety and efficiency of resource exploitation, and underground secondary pollution, the safety for solving the problems, such as that conventional blast technology causes are poor, high-cost.
Description
Technical field
The invention belongs to coal mining technology fields, and in particular to cut top release construction party to a kind of precracking hydraulic fracturing
Method and drilling machine.
Background technique
China's coal-mine exploitation at present is mainly underground mining, and before mining activity does not start to, coal rock layer is answered in protolith
Power state.After underground carries out large area back production, above goaf rock stratum weight will be shifted to supporting area around, in goaf four
Week forms abutment area, and mobility support pressure is formed in front of working face, after working face tilts upper and lower and working face
It is rectangular at remaining support pressure.The activity of overlying rock caused by working face mining causes the advanced section tunnel of stope to be shunk
Amount is big, which to need constantly to reprocess, to face lost motion pressure Tunnel Pressure presentation time long seriously affects that tunnel safety uses, face end hangs
Top area leads to greatly a series of mine pressure disasters such as gas exceeding limit, has seriously affected the safety in production of mine, has been badly in need of dry using worker
Pre- means change stope top board structure, eliminate or weaken the power source of mine pressure disaster.
The method that manual intervention at present changes stope top board structure mainly has two methods of explosion and hydrofracturing.
With the progress of coal mining technology, the requirement for changing stope top board structure technical advance to manual intervention is also more next
Higher, conventional blast technology highlights many drawbacks: the priming systems such as underground coal mine detonator complex management, potential danger are big；Explosion
Overhead caving single hole control range is small, explosion hole depth is limited, project amount and explosive consumption are big；Explosion causes air, vibration etc.
Secondary pollution, the toxic and harmful gas such as carbon monoxide of generation pollute working environment at coal mines；Energetic disturbance is big, blasting impact rapid wear
Evil bracket；Safety is poor, the spark of explosive blasting and instantaneously generates the pernicious gases such as a large amount of CO and causes security risk, for high watt
This mine should not use；Explosive cost and management cost are high.
The present invention devises a kind of precracking hydraulic fracturing and cuts top relief construction method and drilling machine, which can
The integrality for making roof strata directional fracturing, destroying roof strata, directional cutting roof strata weaken coal by artificial method
The high stress of rock mass carrying, makes tunnel or working face be in low stress zones.
Summary of the invention
The present invention is intended to provide a kind of construction method makes roof strata directional fracturing, directional cutting roof strata passes through people
For method weaken coal and rock carrying high stress, so that tunnel or working face is in low stress zones, it is economical, safe and effective
Controlroof.
The present invention provides a kind of precracking hydraulic fracturing and cuts top relief construction method, and specific technical solution is as follows:
A kind of precracking hydraulic fracturing of the present invention cut top relief construction method above the coal column top plate between certain
Every construction drill, using special drill along the axial groove of constructing at regular intervals of drilling；It is inserted into packer and pre- opening rubber membrane,
Make groove in packing section and opening is aligned with groove, then is filled the water into packing section, manual pump pressurization packer, observation packing
Whether pressure declines or there are flowing out in section；High-pressure pump pressure break is connected, prefabricated Fracture orientation hydraulic fracturing is completed and cuts top release work
Industry.
Further, the method includes the following steps:
S1. top plate should be controlled along certain intervals construction drill, the spacing of wells at 15 meters to 30 meters above coal column
Between, in 45 degree to 60 degree of angle, bore diameter is 120 millimeters for boring direction and horizontal direction；It is all pre- in same drilling
Crack processed is not preferably less than 1 meter in same plane, prefabricated fracture interval.
S2. installation, the connection, debugging efforts for carrying out hydraulic pressure equipment are pushed packer by connection water-injection steel pipe
To predetermined position (at precracking), rubber membrane is connected between upper lower packet, forms form of sleeve, rubber membrane two sides are cracked in advance,
It is aligned with precracking, manual pump pressurization packer stops pressurization after pressure reaches 10-16MPa, and observation drills and simultaneously monitors pressure
Table, examine packer can pressure maintaining illustrate that sealing of hole fails if there are flowing out in drilling or pressure decline is obvious, check packer
Each junction and packer itself, find out and solve the problems, such as, it is ensured that packer works normally sealing of hole；Hydraulic fracturing is using retroversion
Formula Splitting Method successively carries out pressure break outward from foot of hole fluting.
S3. open hydraulic pressure instrument, be powered to the water flowing of high-pressure hydraulic pump elder generation, then slowly pressurize again, at the same record water-aspirator pressure table,
Flowmeter and manual pump pressure table data continue pressurization until precracking cracks, and at this moment pressure can decline suddenly, pressure maintaining water filling
Crackle is set to continue to extend, the pressure maintaining hydraulic fracturing time determines according to live pressure break situation, if back, has in coal side or drilling
When water is oozed out or emerged, stop pressure break immediately.
S4. after pressure break, high-pressure hydraulic pump first powers off cuts off the water again, hole packer release, is then log out drilling, prepares pressure next time
It splits.
Further, the precracking includes two angle-shaped grooves and rectangular channel, is respectively at Circularhole diameter both ends, the angle
Shape slot tip angle is between 50 degree to 75 degree, and along the construction of drilling axis direction is parallel to, every precracking length is 50mm, wide
Degree is 5mm, is slotted at regular intervals upwards since foot of hole, and precracking spacing is not preferably less than 1 meter.
Further, the pre- rubber membrane to crack is connected between upper lower packet, pre- crack is aligned with precracking,
While by manual pump pressurization packer, rubber membrane is fitted closely under hydraulic pressure with hole wall, prevents initial fissure pressure release, cracks
Place is opened under water pressure and its edge is fitted closely with precracking edge.
Invention also provides a kind of drilling machines, for constructing to above-mentioned precracking.
The drilling machine includes drill bit, cutting equipment, cutting equipment casing and drilling rod, drilling rod, cutting equipment diameter phase
Together, cutting equipment casing, bit diameter are identical, and diameter is less than the latter；Drilling rod connects cutting equipment, cutting equipment outside
Casing is set, which can be along drilling steel slip；Total length is greater than cutting equipment diameter after drill is stretched out, and protrudes from both ends drill
Cutting equipment two sides.
Further, row's idler wheel is respectively set on cutting equipment casing and drill bit, and face is sliding perpendicular to icking tool where idler wheel
Dynamic face.
Further, the drill two sides are symmetrical, and every side is by spiral pointed drill knife, rod piece connector (built-in miniature motor)
It is formed with rack, two sides are connected by gear-linked telescoping rod, to the precracking being previously mentioned of constructing.Setting in the drill bit
Driving device is connected with drill bottom miniature motor by Thin cable, makes drill itself high speed rotation in this way,
Two sides drill can be moved axially by translation stage along translation track simultaneously.
Top relief construction method is cut to precracking hydraulic fracturing of the invention with reference to the accompanying drawing and drilling machine is made into one
Walk explanation.
Detailed description of the invention
Fig. 1 is that vertical operation face roadway direction top plate of the present invention cuts top schematic diagram；
Fig. 2 is the drilling machine structural schematic diagram that the present invention uses；
Fig. 3 is precracking floor map of the present invention；
The drill structural schematic diagram that Fig. 4 present invention uses；
Fig. 5 is the top plate hydraulic fracturing schematic device that the present invention uses；
Fig. 6 is the pressurizer schematic diagram that the present invention uses.
Description of symbols
1, drilling machine, 2, drilling rod, 3, precracking, 4, drill bit, 5, water-injection steel pipe, 6, the high pressure water injection sebific duct quickly connected,
7, pressure gauge, 8, connector, 9, static pressure water inlet pipeline, 10, high-pressure hydraulic pump, 11, water-aspirator pressure table, 12, flowmeter, 13, manually
Pump, 14, manual pump pressure table, 15, high pressure water injection sebific duct, 16, store pressure break medium water and oil accumulator, 17, rubber membrane,
18, packer, 19, precracking, 20, pressure break steel pipe (tube wall punching)；
31, angle-shaped groove, 32, circular hole；
41, drill rod connector, 42, idler wheel, 43, drill equipment casing, 44, casing track, 45, drill bit (built-in driving dress
Set), 46, drill, 47, translation stage；
461, spiral pointed drill knife, 462, rack, 463, rod piece connector (built-in miniature motor), 464, rotary teeth
Wheel, 465, translation track.
Specific embodiment
Below in conjunction with attached drawing, detailed description of the preferred embodiments.Specific embodiment described herein
It is merely to illustrate and explain the present invention, is not intended to restrict the invention.
With reference to Fig. 1-Fig. 6, top relief construction method is cut in precracking hydraulic fracturing, is included the following steps:
S1. top plate should be controlled along certain intervals construction drill, the spacing of wells at 15 meters to 30 meters above coal column
Between；Using the construction of special drill 4 precracking 3 in Fig. 2, augers 46 is in the case where miniature motor built in connecting rod 463 drives
High-speed rotation, in connecting rod 463 and rotate under the drive of gear 464 can vertical translation track stretch, while drill 46 can
It is moved in cutting equipment along translation track 465 by translation stage translation track, precracking length is 50mm, drill bit and gaining machine
Tool casing upper roller 42 slides on the wall of a borehole, this device can keep in same drilling that all precrackings are in same plane, rear
Effectively achieve the purpose that directional fracturing when phase pressure break, reduce hydraulic fracturing blind area, precracking spacing is not preferably less than 1 meter.
S2. it installed, connected, debugging efforts, packer 18 is pushed to by predetermined position by connection water-injection steel pipe 6
(comprising at precracking) connects rubber membrane 17 between upper lower packet, forms form of sleeve, and rubber membrane two sides are cracked in advance, and pre-
Crack alignment stops pressurization first by the pressurization packer of manual pump 13 after pressure reaches 10-16MPa, and observation drills and supervises
Measuring pressure table 14, examine packer 18 and rubber membrane 17 can pressure maintaining, if there are flowing out in drilling or pressure decline is obvious, explanation
Sealing of hole failure checks each junction of packer and packer itself, finds out and solve the problems, such as, it is ensured that packer works normally envelope
Hole, rubber membrane fit closely under hydraulic pressure with hole wall, crack place opening and its edge and precracking side edge under water pressure
Initial fissure pressure release is prevented, and makes effect of water pressure in precracking as far as possible；Hydraulic fracturing use retroversion formula Splitting Method, i.e., from
Pressure break is successively carried out at foot of hole fluting outward.
S3. prepare pressurization, be powered, then slowly pressurize, while recording water-aspirator pressure table again to the first water flowing of high-pressure hydraulic pump 10
11,14 data of flowmeter 12 and manual pump pressure table continue pressurization until precracking cracks, and at this moment the reading of pressure gauge 7 can dash forward
So decline, pressure maintaining water filling make crackle continue to extend, and the pressure maintaining hydraulic fracturing time determines according to live pressure break situation, if tunnel is pushed up
Plate stops pressure break when coal is helped or has water to ooze out or emerge in drilling immediately.
S4. after pressure break, high-pressure hydraulic pump 10 first powers off cuts off the water again, hole packer release, is then log out drilling, prepares next time
Pressure break, according to field condition, same place can carry out pressure break repeatedly.
, should be on same cutting planes for all angle-shaped grooves in same drilling when constructing precracking, the side of avoiding
To inconsistent situation, it otherwise will will affect and cut top effect.Top plate is concentrated by the stress of angle-shaped groove and is made under human intervention
With, cutting belt is formed under hydraulic fracturing, effectively reduces surrouding rock stress, is reduced and is deformed, controlroof.
Rubber membrane 17 in pressure maintaining measure preferably uses material identical as packer to be made, and pre- Opening length can on rubber membrane
Slightly larger than precracking length, the ductility of rubber material under stress, and easy to use, operation letter is utilized in this pressure maintaining measure
Single, Technological Economy.
The special drill equipment that the present invention uses includes drill bit 45, casing track 44,43 drill 46 of cutting equipment casing, puts down
Moving stage 47 and drill rod connector 41, wherein drilling rod, cutting equipment diameter are identical, and cutting equipment casing, bit diameter are identical, and bore
Bar, cutting equipment diameter are less than cutting equipment casing, drill bit；41 side jointed rod of drill rod connector, the other side connect cutting
Casing 43 is arranged in equipment, cutting equipment outside, which can slide along casing track 44, and a part of impurity can be stopped to enter quarter
Scouring machine tool influences icking tool use, and idler wheel 42 rolls on the wall of a borehole above casing, in turn ensures that precracking is constructed in same drilling
Direction it is consistent always；Total length is greater than 43 diameter of casing after icking tool 46 stretches out, and both ends drill bit is made to stretch out processus aboralis for gaining machine
Have two sides.
In conjunction with attached drawing, only preferred embodiments of the present invention will be described above, not limits the scope of the present invention
Fixed, without departing from the spirit of the design of the present invention, those skilled in the art carry out the technical solution of invention a variety of simple
Deformation, should all fall into claims of the present invention determine protection scope.
Claims (7)
1. top relief construction method and drilling machine are cut in a kind of precracking hydraulic fracturing, it is characterised in that: the top plate above coal column
Along certain intervals construction drill, constructed at regular intervals precracking using special drill along axial direction；It is inserted into packer and pre- opening
Rubber membrane makes precracking be located in packing section and be open and is aligned with precracking, then fills the water into packing section, manual pump pressurization packing
Device, observation insulate whether pressure in section declines or there are flowing out；High-pressure pump pressure break is connected, prefabricated Fracture orientation hydraulic fracturing is completed
Cut top release operation.
2. top relief construction method is cut in precracking hydraulic fracturing according to claim 1, which is characterized in that specifically include as
Lower step:
S1. along certain intervals construction drill, the spacing of wells should control between 15 meters to 30 meters top plate above coal column；
All precrackings are not preferably less than 1 meter in same plane, precracking spacing in same drilling.
S2. the installation of hydraulic pressure equipment, connection, debugging efforts are carried out, is pushed to packer by connection water-injection steel pipe predetermined
Position (at precracking), rubber membrane two sides are cracked in advance, are aligned with precracking, and can manual pump pressurization packer examine packer
Pressure maintaining；Hydraulic fracturing uses retroversion formula Splitting Method, i.e., successively carries out pressure break outward from foot of hole fluting.
S3. it is powered to the water flowing of high-pressure hydraulic pump elder generation, then slowly pressurizes again, until precracking cracks, at this moment pressure can decline suddenly,
Pressure maintaining water filling makes crackle continue to extend, if back, when having water to ooze out or emerge in coal side or drilling, stops pressure break immediately.
S4. after pressure break, high-pressure hydraulic pump first powers off cuts off the water again, hole packer release, is then log out drilling, prepares next pressure break.
3. top relief construction method and drilling machine, feature are cut in a kind of precracking hydraulic fracturing according to claim 2
Be: the precracking includes two angle-shaped grooves and rectangular channel, is respectively at Circularhole diameter both ends, angle-shaped groove tip angle
Between 50 degree to 75 degree, along the construction of drilling axis direction is parallel to, every precracking length is 50mm, width 5mm, from hole
Baseplane is slotted at regular intervals upwards, and precracking spacing is not preferably less than 1 meter.
4. top relief construction method and drilling machine, feature are cut in a kind of precracking hydraulic fracturing according to claim 2
It is: is connected with the pre- rubber membrane to crack between upper lower packet, cracks be aligned with precracking in advance, is pressurizeed and sealed by manual pump
While device, rubber membrane is fitted closely under hydraulic pressure with hole wall, prevents initial fissure pressure release, and place of cracking is opened under water pressure
And its edge and precracking side edge.
5. top relief construction method and drilling machine are cut in a kind of precracking hydraulic fracturing, it is characterised in that: for constructing, right is wanted
Seek precracking described in 1；The drilling machine equipment includes drill bit, cutting equipment, cutting equipment casing and drilling rod, drilling rod, gaining machine
Tool diameter is identical, and cutting equipment casing, bit diameter are identical, and cutting equipment casing diameter is greater than cutting equipment diameter；Drilling rod
Cutting equipment is connected, casing is set on the outside of cutting equipment, which can be along drilling steel slip；Total length is greater than cutting after drill is stretched out
Equipment diameter makes both ends drill protrude from cutting equipment two sides.
6. drilling machine according to claim 5, it is characterised in that: a row is respectively arranged on cutting equipment casing and drill bit
Idler wheel, face is perpendicular to icking tool sliding surface where idler wheel.
7. drilling machine according to claim 5, it is characterised in that: the drill two sides are symmetrical, and every side is by spiral point
Drill, rod piece connector (built-in miniature motor) and rack composition, two sides are connected by gear-linked telescoping rod, to apply
The precracking that work is previously mentioned.Driving device is set in the drill bit, by Thin cable with drill bottom connector rails built in it is small-sized
Motor is connected, and makes drill itself high speed rotation in this way, while two sides drill can be by translation stage along translation rail
Road axial movement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910206420.8A CN109958421B (en) | 2019-03-19 | 2019-03-19 | Pre-crack hydraulic fracturing roof cutting pressure relief construction method and drilling machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910206420.8A CN109958421B (en) | 2019-03-19 | 2019-03-19 | Pre-crack hydraulic fracturing roof cutting pressure relief construction method and drilling machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109958421A true CN109958421A (en) | 2019-07-02 |
| CN109958421B CN109958421B (en) | 2020-07-03 |
Family
ID=67024543
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910206420.8A Expired - Fee Related CN109958421B (en) | 2019-03-19 | 2019-03-19 | Pre-crack hydraulic fracturing roof cutting pressure relief construction method and drilling machine |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110985109A (en) * | 2019-12-17 | 2020-04-10 | 陕西煤业化工技术研究院有限责任公司 | High-pressure water injection fracturing system and operation method |
| CN111022049A (en) * | 2019-11-25 | 2020-04-17 | 中国矿业大学 | Operation-controllable roof-cutting pressure-relief gob-side entry retaining method |
| CN111255463A (en) * | 2020-02-21 | 2020-06-09 | 中煤科工集团西安研究院有限公司 | Hard top plate comb-shaped long drilling segmented fracturing roadway deformation source treatment method |
| CN111636869A (en) * | 2020-04-26 | 2020-09-08 | 华北科技学院 | Roadway protection structure and method for gob-side roadway |
| CN111810164A (en) * | 2020-07-13 | 2020-10-23 | 大同煤矿集团有限责任公司 | Hard roof cutting method based on perforation and hydraulic fracturing |
| CN112879031A (en) * | 2021-04-02 | 2021-06-01 | 中国铁建重工集团股份有限公司 | Chain arm saw type top cutting pressure relief equipment |
| CN112943172A (en) * | 2021-03-31 | 2021-06-11 | 内蒙古科技大学 | Method for fracturing coal and rock mass by high-voltage electric pulse hydraulic pressure and guide crack opening device |
| CN113006796A (en) * | 2021-04-14 | 2021-06-22 | 中国矿业大学 | Coal and contact symbiotic oil shale fracturing co-production method |
| US11299954B2 (en) * | 2018-05-31 | 2022-04-12 | China University Of Mining And Technology | Fracturing relief method for stress concentration of remaining ore pillars in overlying goaf |
| CN115559772A (en) * | 2022-10-24 | 2023-01-03 | 中煤科工集团重庆研究院有限公司 | Bedding drilling directional hydraulic joint cutting pressure relief and permeability increasing method |
| CN115680595A (en) * | 2022-09-09 | 2023-02-03 | 中国矿业大学 | Hydraulic fracturing high-pressure steel pipe rapid installation and withdrawal device and method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11299954B2 (en) * | 2018-05-31 | 2022-04-12 | China University Of Mining And Technology | Fracturing relief method for stress concentration of remaining ore pillars in overlying goaf |
| CN111022049A (en) * | 2019-11-25 | 2020-04-17 | 中国矿业大学 | Operation-controllable roof-cutting pressure-relief gob-side entry retaining method |
| CN111022049B (en) * | 2019-11-25 | 2020-12-04 | 中国矿业大学 | Operation-controllable roof-cutting pressure-relief gob-side entry retaining method |
| WO2021103533A1 (en) * | 2019-11-25 | 2021-06-03 | 中国矿业大学 | Operation-controllable, roof-cutting, pressure-relief, gob-side entry retaining method |
| CN110985109A (en) * | 2019-12-17 | 2020-04-10 | 陕西煤业化工技术研究院有限责任公司 | High-pressure water injection fracturing system and operation method |
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| CN111810164B (en) * | 2020-07-13 | 2022-05-31 | 晋能控股煤业集团有限公司 | Hard roof cutting method based on perforation and hydraulic fracturing |
| CN112943172A (en) * | 2021-03-31 | 2021-06-11 | 内蒙古科技大学 | Method for fracturing coal and rock mass by high-voltage electric pulse hydraulic pressure and guide crack opening device |
| CN112943172B (en) * | 2021-03-31 | 2022-07-08 | 内蒙古科技大学 | High-voltage electric pulse hydraulic fracturing method for coal rock mass and guide crack opening device |
| CN112879031A (en) * | 2021-04-02 | 2021-06-01 | 中国铁建重工集团股份有限公司 | Chain arm saw type top cutting pressure relief equipment |
| CN113006796A (en) * | 2021-04-14 | 2021-06-22 | 中国矿业大学 | Coal and contact symbiotic oil shale fracturing co-production method |
| CN113006796B (en) * | 2021-04-14 | 2021-11-23 | 中国矿业大学 | Coal and contact symbiotic oil shale fracturing co-production method |
| CN115680595A (en) * | 2022-09-09 | 2023-02-03 | 中国矿业大学 | Hydraulic fracturing high-pressure steel pipe rapid installation and withdrawal device and method thereof |
| CN115680595B (en) * | 2022-09-09 | 2023-08-22 | 中国矿业大学 | Rapid installation and withdrawal device and method for hydraulic fracture high-pressure steel pipe |
| CN115559772A (en) * | 2022-10-24 | 2023-01-03 | 中煤科工集团重庆研究院有限公司 | Bedding drilling directional hydraulic joint cutting pressure relief and permeability increasing method |
| CN115559772B (en) * | 2022-10-24 | 2024-04-09 | 中煤科工集团重庆研究院有限公司 | Bedding drilling directional hydraulic kerf pressure relief and reflection increase method |
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