CN102425397A - Method for exploiting coal-bed methane by utilizing water force of horizontal pinnate well of double well-shaft to scour, drill and relieve pressure - Google Patents

Method for exploiting coal-bed methane by utilizing water force of horizontal pinnate well of double well-shaft to scour, drill and relieve pressure Download PDF

Info

Publication number
CN102425397A
CN102425397A CN2011104502342A CN201110450234A CN102425397A CN 102425397 A CN102425397 A CN 102425397A CN 2011104502342 A CN2011104502342 A CN 2011104502342A CN 201110450234 A CN201110450234 A CN 201110450234A CN 102425397 A CN102425397 A CN 102425397A
Authority
CN
China
Prior art keywords
well
coal
water
horizontal
pinniform
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN2011104502342A
Other languages
Chinese (zh)
Inventor
冯立杰
钟华珂
王金凤
余华杰
李朝辉
邓珺
李耀辉
何传星
马鸿廉
冯奕程
盛旭阳
王俊淇
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhengzhou University
Original Assignee
Zhengzhou University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zhengzhou University filed Critical Zhengzhou University
Priority to CN2011104502342A priority Critical patent/CN102425397A/en
Publication of CN102425397A publication Critical patent/CN102425397A/en
Pending legal-status Critical Current

Links

Abstract

The invention discloses a method for exploiting coal-bed methane by utilizing a water force of a horizontal pinnate well of a double well-shaft to scour, drill and relieve pressure. The method comprises the following steps: drilling a straight drainage well (3), digging a hole in a section of a target coal-bed (2) and forming a pocket (4) after passing through the coal-bed; drilling a straight well section (9) and a building section (10) of a horizontal pinnate well (8) and placing a casing pipe for fixing the well; placing a water-spraying hose (12) connected with a high-pressure water pump (11) into the horizontal pinnate well (8); passing through a cave (5), scouring the coal-bed with a high-pressure jetted water and drilling along a horizontal direction, thereby forming a horizontal sectional main well hole (14); changing a jetting direction, and jetting a plurality of branched well holes (16) around the horizontal sectional main well hole (14); causing coal water to flow back to the pocket (4) during a jetting process, and discharging the coal water through a lifting device (6); separating through a methane, coal and water separating device (7); collecting and storing the coal and methane; and reusing the water to jet flow and scour under the well. The invention provides a new solution for ground gas production on a mellow and low-seepage coal bed.

Description

The horizontal pinniform well water of twin-well tube power is washed away and is crept into the release method for exploiting coal bed methane
Technical field
The present invention relates to the coal-bed gas exploitation technical field, also can relate to ground coal, gas and adopt technical field altogether, particularly a kind ofly be applicable to that the horizontal pinniform well water of a kind of twin-well tube power soft, hypotonic, high gas layer is washed away and creep into the release method for exploiting coal bed methane.
Background technology
Coal bed gas surface mining drilling technology mainly is peupendicular hole and horizontal well.Peupendicular hole construction is simple, and cost is lower, but be adapted to mainly that landform is smooth, permeability hard high seam preferably, be not suitable for soft, the low coal seam of passing through; Horizontal well technology is complicated than straight well, but can greatly increase the coal seam bare area, improves methane output.At present, horizontal well mainly contains three kinds: first kind is the horizontal orientation well that only comprises straight well section, inclination section and horizontal segment; Second kind is horizontal butt shaft, the row of horizontal orientation well horizontal segment through special drilling method and far-end preboring is adopted straight well in target coal seam, be docked and connected; The third is horizontal pinniform well, comprises two types in individual well tube and twin-well tube.The horizontal pinniform well of individual well tube be horizontal orientation well horizontal segment again sidetracking go out a plurality of branch well holes, the horizontal pinniform well of twin-well tube has been Duoed the row who is communicated with the horizontal segment main borehole flatly than individual well tube horizontal pinniform well and has been adopted straight well.
The horizontal orientation well construction is simple, but the coal seam bare area is limited, and the interior ponding of well can't solve in the gas production process; Horizontal butt shaft can solve well inner product water problems, but owing to want the far-end butt joint, horizontal segment generally will descend screen casing to support, and is higher to seam hardness and construction technical requirement; Horizontal pinniform well is owing to increased branch well hole; The coal seam bare area significantly increases, but the horizontal pinniform well of individual well tube faces well inner product water problems equally, and the horizontal pinniform well of twin-well tube is adopted straight well owing to increased the mine row of water and coal bed gas of special row; Can effectively solve well inner product water problems; But net horizontal section is positioned at target coal seam, blocks well for preventing and treating Coal Seam Collapse, generally will select harder coal seam construction of ature of coal and screen casing well cementation down.
Yet there is a great deal of soft, hypotonic, high gas layer in China, and conventional levels well drilling technology is difficult to gather effect, and the horizontal segment well is difficult to accomplish, and also caves in easily, blocks even accomplish, and is difficult to keep stable discharge space.To this problem, the present invention proposes a kind ofly to use sluicing to creep into horizontal segment main borehole and the branch well hole that obtains and keep the horizontal pinniform well of twin-well tube at weak seam, thus the method for release exploiting coal bed methane.
Summary of the invention
The present invention is directed to soft, hypotonic, the existing difficult problem of high gas layer coal-bed gas exploitation; Characteristics in conjunction with horizontal orientation well, horizontal butt shaft and horizontal pinniform well; Adopt waterpower to creep into, wash away technology, provide the horizontal pinniform well water of a kind of twin-well tube power to wash away and creep into the release method for exploiting coal bed methane.
The object of the invention can be realized through following technique measures (step):
(1) at first, be drilled with row in the precalculated position and adopt straight well, this well is by earth drilling, pass target coal seam after, continue to creep into the pocket of a segment distance, promptly form the well nest of aggregate coal water.
(2) then, be lowered to unusual casing in corresponding target coal seam section, be generally glass reinforced plastic sleeve, the well cementation back slices off glass reinforced plastic sleeve exposes the coal seam, carries out reaming hole, forms the cave.
(3) adopt aforementioned row coal water lifting means is set in the straight well, well head is installed gas, coal, water separation device.Said coal water lifting means generally adopts electric submersible pump, gaslift diaphragm pump, rope to carry bucket, screw pump, jet migration equipment etc.
(4) distance row adopt the suitable distance of straight well the horizontal pinniform well of precalculated position subdrilling straight well section and inclination section and down protective casing cement the well; The straight well section is positioned at the geological stratification of target coal seam top; Inclination section is positioned at target coal seam, transfers drilling direction to level, adopts straight well through the cave with row and is communicated with.
(5) be lowered to water hose, link to each other with the ground high-pressure hydraulic pump, flexible pipe passes the cave, washes away weak seam through high-pressure water jet, creeps into to preset distance at the bearing of trend of inclination section, forms the horizontal segment main borehole.Wherein, the pocket top is provided with bracing or strutting arrangement in the cave, and in order to support water hose, this device can not influence the operate as normal of coal water lifting means through particular design.
(6) after horizontal segment main borehole jet washes away completion, change the high-pressure water shot flow path direction, around horizontal main borehole, eject many branch well holes.
(7) coal-water mixture that in spraying horizontal main borehole of formation and branch well hole process, produces backflows and adopts the sump hole of straight well to row, drains into ground through coal water lifting means.
(8) coal-water mixture is realized separating through gas, coal, water separation device with coal bed gas is adopted straight well row well head, and coal and coal bed gas after the separation are collected storage, and water is reused for the down-hole jet, washes away through high-pressure hydraulic pump again.
Beneficial effect of the present invention is following:
The present invention adopts the method for sluicing, injection to accomplish creeping into of twin-well tube horizontal pinniform well horizontal segment main borehole and branch well hole at soft, hypotonic, high gas layer; Having overcome conventional method, to creep into difficulty at weak seam big; Net horizontal section is difficult to the problem that obtains and keep, has effectively increased the discharge space of coal bed gas; Simultaneously, the technology of this method is simple, and cost is lower, for soft, hypotonic, high gas layer gas production provide new solution.
Description of drawings
Fig. 1 obtains the horizontal pinniform well of twin-well tube horizontal segment main borehole process sketch map for sluicing of the present invention;
Fig. 2 obtains the horizontal pinniform well of twin-well tube horizontal segment branch well hole sketch map for sluicing of the present invention;
Fig. 3 is the left view of twin-well tube of the present invention horizontal pinniform well horizontal segment main borehole and branch well hole;
Fig. 4 is the vertical view of twin-well tube of the present invention horizontal pinniform well horizontal segment main borehole and branch well hole.
Be labeled as among the figure: 1: ground; 2: target coal seam; 3: row adopts straight well; 4: pocket; 5: the cave; 6: lifting means; 7: gas, coal, water separation equipment; 8: horizontal pinniform well; 9: the straight well section; 10: inclination section; 11: high-pressure hydraulic pump; 12: water hose; 13: the flexible pipe bracing or strutting arrangement; 14: the horizontal segment main borehole; 15: coal bed gas extraction equipment; 16: the horizontal segment branch well hole.
Solid arrow is a water (flow) direction among the figure; Dotted arrow is the coal bed gas airflow direction.
The specific embodiment
To combine an embodiment (accompanying drawing) to further describe below the present invention:
(1) at first, be drilled with row in the precalculated position and adopt straight well 3, this well is crept into by ground 1, pass target coal seam 2 after, continue to creep into the pocket 4 of a segment distance, promptly form the well nest of aggregate coal water.
(2) then, be lowered to unusual casing for 2 sections in corresponding target coal seam, be generally glass reinforced plastic sleeve, the well cementation back slices off glass reinforced plastic sleeve exposes the coal seam, carries out reaming hole, forms cave 5.
(3) adopt aforementioned row coal water lifting means 6 is set in the straight well 3, well head is installed gas, coal, water separation device 7.Said coal water lifting means 6 general electric submersible pump, gaslift diaphragm pump, the ropes of adopting are carried bucket, screw pump, jet migration equipment etc.
(4) distance row adopt straight well 3 suitable distances the horizontal pinniform well 8 of precalculated position subdrilling straight well section 9 and inclination section 10 and down protective casing cement the well; Straight well section 9 is positioned at the geological stratification of target coal seam 2 tops; Inclination section 10 tops are right after straight well section 9; Transfer drilling direction to level gradually behind the target approach coal seam 2, hypomere is adopted straight well 3 through cave 5 with row and is communicated with.
(5) in horizontal pinniform well 8, be lowered to water hose 12, link to each other, pass cave 5, wash away weak seam, creep into to preset distance, form horizontal segment main borehole 14 at the bearing of trend of inclination section 10 through high-pressure water jet with ground high-pressure hydraulic pump 11.Wherein, pocket 4 tops are provided with bracing or strutting arrangement 13 in the cave 5, and in order to support water hose 12, this device can not influence the operate as normal of coal water lifting means 6 through particular design.
(6) after horizontal segment main borehole 14 jets wash away completion, change the high-pressure water shot flow path direction, around horizontal main borehole, eject many branch well holes 16.
(7) coal-water mixture that in spraying formation horizontal segment main borehole 14 and branch well hole 14 processes, produces backflows and adopts the sump hole 4 of straight well 3 to row, drains into ground 1 through coal water lifting means 6.
(8) coal-water mixture is realized separating through gas, coal, water separation device 7 with coal bed gas is adopted straight well 3 row well head, and coal and coal bed gas after the separation are collected storage, and water is reused for the down-hole jet, washes away through high-pressure hydraulic pump 11 again.
The method that the present invention adopts sluicing, injection is crept into soft, hypotonic, the horizontal pinniform well of high gas layer completion horizontal segment main borehole and branch well hole; Having overcome conventional method, to creep into difficulty at weak seam big; Net horizontal section is difficult to the problem that obtains and keep, has effectively increased the discharge space of coal bed gas; Simultaneously, the technology of this method is simple, and cost is lower, for soft, hypotonic, high gas layer gas production provide new solution.

Claims (4)

1. the horizontal pinniform well water of twin-well tube power is washed away and is crept into the release method for exploiting coal bed methane, comprises following step, it is characterized in that:
Step 1 is drilled with row and adopts straight well (3) in the precalculated position, this well is crept into by ground (1), pass target coal seam (2) after, continue to creep into the pocket (4) of a segment distance, promptly form the well nest of aggregate coal water;
Step 2 is lowered to unusual casing in corresponding target coal seam (2) section, and well cementation back sleeve slices off exposes the coal seam, carries out reaming hole, forms cave (5);
Step 3 is adopted aforementioned row coal water lifting means (6) is set in the straight well (3), and well head is installed gas, coal, water separation device (7);
Step 4 is adopted straight well (3) suitably straight well section (9) and the inclination section (10) and the protective casing well cementation down of the horizontal pinniform well of precalculated position subdrilling (8) of distance distance row;
Step 5 is lowered to water hose (12) in horizontal pinniform well (8), link to each other with ground high-pressure hydraulic pump (11), passes cave (5), washes away weak seam through high-pressure water jet, creeps into to preset distance at the bearing of trend of inclination section (10), forms horizontal segment main borehole 14;
Step 6 after horizontal segment main borehole (14) jet washes away completion, changes the high-pressure water shot flow path direction, around horizontal main borehole, ejects many branch well holes (16);
Step 7, the coal-water mixture that in spraying formation horizontal segment main borehole (14) and branch well hole (14) process, produces backflows and adopts the sump hole (4) of straight well (3) to row, drains into ground (1) through coal water lifting means (6);
Step 8, coal-water mixture separates through gas, coal, water separation device (7) with coal bed gas is adopted straight well (3) row well head, and coal and coal bed gas after the separation are collected storage, and water is reused for the down-hole jet, washes away through high-pressure hydraulic pump (11) again.
2. the horizontal pinniform well water of twin-well tube as claimed in claim 1 power is washed away and crept into the release method for exploiting coal bed methane, it is characterized in that: the selection that said row adopts straight well (3) and horizontal pinniform well (8) pithead position is looked coalfield landform, coal seam and gas bearing condition and is decided.
3. the horizontal pinniform well water of twin-well tube as claimed in claim 1 power is washed away and is crept into the release method for exploiting coal bed methane; It is characterized in that: straight well section (9) is positioned at the geological stratification of target coal seam (2) top; Inclination section (10) top is right after straight well section (9); The target approach coal seam transfers drilling direction to level after (2) gradually, and hypomere is adopted straight well (3) through cave (5) with row and is communicated with.
4. the horizontal pinniform well water of twin-well tube as claimed in claim 1 power is washed away and is crept into the release method for exploiting coal bed methane; It is characterized in that: pocket (4) top is provided with bracing or strutting arrangement (13) in cave (5); In order to support water hose (12), this Design of device is good with the operate as normal that does not influence coal water lifting means (6).
CN2011104502342A 2011-12-29 2011-12-29 Method for exploiting coal-bed methane by utilizing water force of horizontal pinnate well of double well-shaft to scour, drill and relieve pressure Pending CN102425397A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2011104502342A CN102425397A (en) 2011-12-29 2011-12-29 Method for exploiting coal-bed methane by utilizing water force of horizontal pinnate well of double well-shaft to scour, drill and relieve pressure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2011104502342A CN102425397A (en) 2011-12-29 2011-12-29 Method for exploiting coal-bed methane by utilizing water force of horizontal pinnate well of double well-shaft to scour, drill and relieve pressure

Publications (1)

Publication Number Publication Date
CN102425397A true CN102425397A (en) 2012-04-25

Family

ID=45959422

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2011104502342A Pending CN102425397A (en) 2011-12-29 2011-12-29 Method for exploiting coal-bed methane by utilizing water force of horizontal pinnate well of double well-shaft to scour, drill and relieve pressure

Country Status (1)

Country Link
CN (1) CN102425397A (en)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102767349A (en) * 2012-07-12 2012-11-07 中国石油天然气股份有限公司 Coalbed methane horizontal well screen pipe suspension well completion method
CN102828768A (en) * 2012-08-28 2012-12-19 山西潞安集团余吾煤业有限责任公司 Method and system for gas pumping of high-gas coal mines
CN103161440A (en) * 2013-02-27 2013-06-19 中联煤层气国家工程研究中心有限责任公司 Single-well coalbed methane horizontal well system and finishing method thereof
CN103711473A (en) * 2013-12-30 2014-04-09 中国石油集团渤海钻探工程有限公司 Double-circulation relay type method for drilling and completing coal seam composite well
CN104213882A (en) * 2013-06-05 2014-12-17 中国石油天然气集团公司 Coalbed methane horizontal well PE screen pipe well completion method and device
CN104912480A (en) * 2015-04-30 2015-09-16 中煤科工集团西安研究院有限公司 Drilling and completion method for coal bed gas near-end butt-joint horizontal well
CN104912520A (en) * 2014-03-14 2015-09-16 郑州大学 Horizontally butted well hydraulic scour migration pressure relief outburst elimination gas extraction method
CN105019935A (en) * 2014-04-16 2015-11-04 郑州大学 Overground/underground combined pressure relief outburst elimination coal seam rapid channel digging method
CN105986795A (en) * 2015-02-10 2016-10-05 中国石油天然气股份有限公司 Coal bed gas horizontal well coal bed transformation method
CN104343424B (en) * 2013-08-02 2017-02-15 中国石油天然气集团公司 Coalbed-methane horizontal-well PE (poly ethylene) screen pipe well completion application process method
CN106948860A (en) * 2017-05-27 2017-07-14 中煤科工集团重庆研究院有限公司 The method for cooperateing with progressive draining coal seam gas with directional drilling based on U-shaped well
CN108625824A (en) * 2018-05-02 2018-10-09 辽宁工程技术大学 A kind of buried aqueous coal bed gas extraction drilling method for arranging
CN108643867A (en) * 2018-05-21 2018-10-12 河南工程学院 Coal extraction coal bed gas technique is drawn in a kind of release, water-jet
CN108798516A (en) * 2018-04-28 2018-11-13 中国矿业大学 A kind of deformation coal original position coal bed gas horizontal well cave Depressurized mining method
CN108843241A (en) * 2018-04-28 2018-11-20 中国矿业大学 A kind of deformation coal original position coal bed gas horizontal well cave Depressurized mining system
WO2019205517A1 (en) * 2018-04-28 2019-10-31 中国矿业大学 Coalbed methane horizontal well hole collapse cave-building pressure relief developing system and method

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2350504C (en) * 1998-11-20 2004-02-10 Cdx Gas, Llc Method and system for accessing subterranean deposits from the surface
CN101586441A (en) * 2009-07-01 2009-11-25 煤炭科学研究总院重庆研究院 High-pressure water jet system and method for drilling and enlarging holes on coal bed
CN101775974A (en) * 2010-01-28 2010-07-14 郑州大学 Method for exploiting coal bed methane (CBM) by water transportation and pressure relief in butted well
CN102080530A (en) * 2010-12-22 2011-06-01 北京奥瑞安能源技术开发有限公司 Method for constructing horizontal coal bed gas well and vertical drainage and mining well
CN102094668A (en) * 2010-12-20 2011-06-15 郑州大学 High-pressure hydraulic drilling, pressure releasing and protrusion removing method for upper drainage roadway
CN102213077A (en) * 2011-05-25 2011-10-12 煤炭科学研究总院沈阳研究院 Coal seam reaming system using three-dimensional (3D) swirling water jet and reaming and fracturing method for permeability enhancement
CN202064928U (en) * 2011-05-30 2011-12-07 北京奥瑞安能源技术开发有限公司 Coal-bed gas multi-branch horizontal well system

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2350504C (en) * 1998-11-20 2004-02-10 Cdx Gas, Llc Method and system for accessing subterranean deposits from the surface
CN101586441A (en) * 2009-07-01 2009-11-25 煤炭科学研究总院重庆研究院 High-pressure water jet system and method for drilling and enlarging holes on coal bed
CN101775974A (en) * 2010-01-28 2010-07-14 郑州大学 Method for exploiting coal bed methane (CBM) by water transportation and pressure relief in butted well
CN102094668A (en) * 2010-12-20 2011-06-15 郑州大学 High-pressure hydraulic drilling, pressure releasing and protrusion removing method for upper drainage roadway
CN102080530A (en) * 2010-12-22 2011-06-01 北京奥瑞安能源技术开发有限公司 Method for constructing horizontal coal bed gas well and vertical drainage and mining well
CN102213077A (en) * 2011-05-25 2011-10-12 煤炭科学研究总院沈阳研究院 Coal seam reaming system using three-dimensional (3D) swirling water jet and reaming and fracturing method for permeability enhancement
CN202064928U (en) * 2011-05-30 2011-12-07 北京奥瑞安能源技术开发有限公司 Coal-bed gas multi-branch horizontal well system

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102767349B (en) * 2012-07-12 2015-05-27 中国石油天然气股份有限公司 Coalbed methane horizontal well screen pipe suspension well completion method
CN102767349A (en) * 2012-07-12 2012-11-07 中国石油天然气股份有限公司 Coalbed methane horizontal well screen pipe suspension well completion method
CN102828768A (en) * 2012-08-28 2012-12-19 山西潞安集团余吾煤业有限责任公司 Method and system for gas pumping of high-gas coal mines
CN103161440A (en) * 2013-02-27 2013-06-19 中联煤层气国家工程研究中心有限责任公司 Single-well coalbed methane horizontal well system and finishing method thereof
CN104213882A (en) * 2013-06-05 2014-12-17 中国石油天然气集团公司 Coalbed methane horizontal well PE screen pipe well completion method and device
CN104343424B (en) * 2013-08-02 2017-02-15 中国石油天然气集团公司 Coalbed-methane horizontal-well PE (poly ethylene) screen pipe well completion application process method
CN103711473B (en) * 2013-12-30 2016-01-20 中国石油集团渤海钻探工程有限公司 Two-way Cycle relay-type coal seam compound well bores completion method
CN103711473A (en) * 2013-12-30 2014-04-09 中国石油集团渤海钻探工程有限公司 Double-circulation relay type method for drilling and completing coal seam composite well
CN104912520B (en) * 2014-03-14 2017-12-29 郑州大学 Horizontally-butted wells sluicing migration release extinction gas production method
CN104912520A (en) * 2014-03-14 2015-09-16 郑州大学 Horizontally butted well hydraulic scour migration pressure relief outburst elimination gas extraction method
CN105019935A (en) * 2014-04-16 2015-11-04 郑州大学 Overground/underground combined pressure relief outburst elimination coal seam rapid channel digging method
CN105986795A (en) * 2015-02-10 2016-10-05 中国石油天然气股份有限公司 Coal bed gas horizontal well coal bed transformation method
CN105986795B (en) * 2015-02-10 2018-09-04 中国石油天然气股份有限公司 Coal bed gas horizontal well coal seam remodeling method
CN104912480A (en) * 2015-04-30 2015-09-16 中煤科工集团西安研究院有限公司 Drilling and completion method for coal bed gas near-end butt-joint horizontal well
CN106948860A (en) * 2017-05-27 2017-07-14 中煤科工集团重庆研究院有限公司 The method for cooperateing with progressive draining coal seam gas with directional drilling based on U-shaped well
US10830018B1 (en) 2018-04-28 2020-11-10 China University Of Mining And Technology Method of extracting gas from tectonically-deformed coal seam in-situ by depressurizing horizontal well cavity
CN108798516A (en) * 2018-04-28 2018-11-13 中国矿业大学 A kind of deformation coal original position coal bed gas horizontal well cave Depressurized mining method
CN108843241A (en) * 2018-04-28 2018-11-20 中国矿业大学 A kind of deformation coal original position coal bed gas horizontal well cave Depressurized mining system
WO2019205517A1 (en) * 2018-04-28 2019-10-31 中国矿业大学 Coalbed methane horizontal well hole collapse cave-building pressure relief developing system and method
WO2019205515A1 (en) * 2018-04-28 2019-10-31 中国矿业大学 Method of extracting gas from tectonically-deformed coal seam in-situ by depressurizing horizontal well cavity
CN108625824A (en) * 2018-05-02 2018-10-09 辽宁工程技术大学 A kind of buried aqueous coal bed gas extraction drilling method for arranging
CN108643867A (en) * 2018-05-21 2018-10-12 河南工程学院 Coal extraction coal bed gas technique is drawn in a kind of release, water-jet

Similar Documents

Publication Publication Date Title
CN102425397A (en) Method for exploiting coal-bed methane by utilizing water force of horizontal pinnate well of double well-shaft to scour, drill and relieve pressure
CN102518411A (en) Method for mining coal bed gas by hydraulic washout of butted well in manner of pressure relief
CN102926730B (en) Mining method for support pipe following air liquid spraying and drilling into coal bed gas of radial well
CN102116140B (en) Construction method for enhancing extraction effect of ground coal bed gas
CN102168575B (en) Loose blasting gas extraction technology for horizontal branch well of coal seam floor
CN103527092B (en) Suction bits expanding method is penetrated in horizontal orientation boring
CN102518412A (en) Method for mining coal and gas by hydraulic jet grouting washout
CN104806217A (en) Combined separated layer fracturing, grouping and layer-combining mining method for coal bed well group
CN101775974B (en) Method for exploiting coal bed methane (CBM) by water transportation and pressure relief in butted well
CN102661167B (en) Protected seam bottom plate upward comb-shaped drilled hole gas extraction method
CN101775975A (en) Method for exploiting coal bed gas by hydraulic drilling and pressure relieving
CN102852490A (en) High gas suction and discharge process method for complex well
CN108661618B (en) Reservoir transformation method for L type horizontal well of coal bed gas
CN102747999A (en) Method for developing coal bed gas by deeply penetrating radial horizontal well by hydraulic power
CN102094668A (en) High-pressure hydraulic drilling, pressure releasing and protrusion removing method for upper drainage roadway
CN102536302A (en) Method for relieving pressure and eliminating outburst of ground butting well
CN202000941U (en) Underground sleeving wall punching device for oil well
CN105986795A (en) Coal bed gas horizontal well coal bed transformation method
CN108661697A (en) Long drilled holes gas enhanced gas extraction method under the service well of ground
CN110566118B (en) Advanced grouting transformation method for combined directional hole of underground deep-buried aquifer bottom plate of coal mine
CN104912520B (en) Horizontally-butted wells sluicing migration release extinction gas production method
CN102418508A (en) Water jet packing tool
CN110107263B (en) Method for exploiting coal bed gas from tectonic coal reservoir
CN103321613A (en) Method and device for exploiting coal bed methane by discharging water and pulverized coal
CN109057757B (en) Natural gas hydrate exploitation method and device

Legal Events

Date Code Title Description
PB01 Publication
C06 Publication
SE01 Entry into force of request for substantive examination
C10 Entry into substantive examination
WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20120425

C02 Deemed withdrawal of patent application after publication (patent law 2001)