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 PDFInfo
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- 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
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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
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).
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| 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 |
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| 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 |
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| 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 |
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Application publication date: 20120425 |