CN104912520A - Horizontally butted well hydraulic scour migration pressure relief outburst elimination gas extraction method - Google Patents
Horizontally butted well hydraulic scour migration pressure relief outburst elimination gas extraction method Download PDFInfo
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Abstract
The invention discloses a horizontally butted well hydraulic scour migration pressure relief outburst elimination gas extraction method. Firstly, a plumb shaft (8) is drilled, the cased hole completion is performed above a coal seam roof, and the barefoot completion is performed below the coal seam roof; an inclined section (4) of a horizontally butted well (3) is drilled, and the casing cementing is performed; then, a horizontal section (5) channel is drilled by a conventional method, and is in butt joint with the plumb shaft (8), and the barefoot completion is performed; a screen pipe (15) and a continuous play pipe (13) are put down onto the horizontal section (5), the screen pipe (15) has a screen hole (14), and a piston seal (12) is additionally mounted at the top end of the continuous play pipe (13); high-flow high-head clear water is continuously injected into the plumb shaft (8) to scour coal powder through the screen hole (14) to form coal powder slurry, and a plug head is moved to repeatedly operate; the coal powder slurry is discharged to the ground through a horizontal well mouth annulus part (3); and a gas, coal and water separation device (7) is used for separating, coal and gas are collected and stored, and water is circulated for downhole jetting and scouring. The horizontally butted well hydraulic scour migration pressure relief outburst elimination gas extraction method provides a new solution for low-permeation soft coal seam ground pressure relief outburst elimination gas extraction.
Description
Technical field
The present invention relates to gas extinction and the coal bed gas extraction field of soft, hypotonic, high prominent coal seam reservoirs, be particularly suitable for that coal dust solubization is good, runny coal seam under pressure.
Background technology
Mining of coal bed gas drilling technology is peupendicular hole and horizontal well mainly.Due to the impact of many reasons, the coalbed methane reservoir common manifestation of China is " three is low " feature of low pressure, hypotonic and low gas content saturation ratio.The reservoir conditions of this " three is low " makes conventional ground straight well production technique show deficiency gradually in the cbm development of China, cannot obtain expection effect.And cbm development facts have proved that horizontal well can the fissure system of conducting coal seam reservoirs effectively, increase gas, water flow conductivity, increase substantially well yield and recovery ratio, it is the effective means of exploitation low pressure, hypotonic regional coal bed gas resource, and horizontally-butted wells is with its rational casing programme and unique completion mode, be more suitable for the cbm development of Chinese most of conditions of coal bed gas reservoir.
Summary of the invention
The present invention is directed to soft, hypotonic, the high prominent gas extinction of coal seam reservoirs and the difficult problem existing for coal bed gas extraction field, in conjunction with the feature of horizontally-butted wells, adopt sluicing, migration technology, a kind of horizontally-butted wells sluicing migration release extinction gas production method is provided.
Object of the present invention realizes by following technique measures (step):
(1) be drilled with straight well in precalculated position, this well by earth drilling, to target coal seam base plate, the above cased hole completion of roof, the following barefoot completion of roof.
(2) construction level well docks with straight well, determines well, transfer screen casing at horizontal segment at straight well and inclination section sleeve pipe, ensures that Butt Section is unimpeded, prevents blocking, and sieve aperture should be large, to reduce fluid resistance.
(3) transfer the hollow or continuous play pipe of solid slim footpath high resiliency at net horizontal section, top installs piston end socket additional, and material should have self lubricity, effect is by screen casing segmentation, segmentation can be realized by steel pipe movement end socket position and wash away operation, form discharge space, realize the object of extinction and gas production; Also can not fill steel pipe, in advance shutoff screen casing one end, entirety washes away operation.
(4) inject large discharge high water head clear water at straight well, wash away coal dust by sieve aperture, form fine coal slurry, and drain into ground by another wellhole, realize coal gas and adopt altogether.
(5) straight well installs water filling sealer additional, installs auto-excitation type mechanical type fluid pulse generator under water filling sealer additional, and to improve scouring effect, gas of also can annotating, forms gas explosion and gas lift.
(6) water-coal-slurry flows out ground under pressure certainly by horizontal well (3), also can coal water extraction be set in aforementioned levels well and rises equipment lifting to ground, well head installs gas, coal, water separation device, described coal water lifting means generally adopts electric submersible pump, gaslift diaphragm pump, rope lift bucket, screw pump, jet migration equipment etc., and the water circulation after separation injects straight well.
(7) water filling and wet well can exchange, and when water injection of horizontal well, straight well draining, straight well Jing Fu can establish coal store, install lifting appliance additional and promote.
(8) if to go out ground not smooth for water-coal-slurry, coal slurry can be promoted at straight well by external force means such as pump row, jet liftings.
(9) the present invention can realize multiple horizontal well and docks with a straight well, should determine level docking Distance geometry horizontal well space layout depending on geological conditions.
Beneficial effect of the present invention is as follows:
Horizontally-butted wells sluicing migration release extinction gas production method of the present invention, utilize piston end socket to move at horizontal segment and realize horizontal well in segments operation, the method of adopt High-Pressure Water to wash away, to spray, migrating obtains and expands horizontal segment discharge channel, achieve coal gas to adopt altogether, shorten construction period simultaneously, be conducive to reducing coal seam reservoirs injury, increase gas permeability of coal seam, create favorable conditions to the release of inside, coal seam, coal bed gas release and flowing, add the extraction efficiency of coal bed gas.
Accompanying drawing explanation
Fig. 1 is the butt shaft schematic diagram before sluicing of the present invention;
Fig. 2 is the butt shaft schematic diagram after sluicing of the present invention;
Fig. 3 is butt shaft water pumping gas production process schematic of the present invention;
Fig. 4 is straight well of the present invention and butt shaft overall structure top view.
Be labeled as in figure: 1: ground; 2: target coal seam; 3: horizontal well; 4: inclination section; 5: horizontal segment; 6: lifting means; 7: gas, coal, water separation equipment; 8: straight well; 9: high-pressure hydraulic pump; 10: coal bed gas extraction equipment; 11: ring seal; 12: plug envelope; 13: play pipe continuously; 14: sieve aperture; 15: screen casing.
In figure, solid arrow is water (flow) direction; Dotted arrow is coal bed gas airflow direction.
Detailed description of the invention
The present invention is further described below with reference to an embodiment (accompanying drawing):
As shown in Figure 1, Figure 2, Figure 3, Figure 4, the concrete implementation step of horizontally-butted wells sluicing migration release extinction gas production method of the present invention is as follows:
(1) be drilled with straight well 8 in precalculated position, this well is crept into by ground 1, to target coal seam 2 base plate, and the above cased hole completion of roof, the following barefoot completion of roof.
(2) construction level well 3 docks with straight well 8, determines well, transfer screen casing 15 at horizontal segment 5 at straight well 8 and inclination section 4 sleeve pipe, ensures that Butt Section is unimpeded, prevents blocking, and sieve aperture 14 should be large, to reduce fluid resistance.
(3) transfer continuous play pipe 13 at net horizontal section 5, top installs piston end socket 12 additional, and material should have self lubricity, and effect is by screen casing 15 segmentation.
(4) inject large discharge high water head clear water at straight well 8, wash away coal dust by sieve aperture 14, form coal dust slurry, and drain into ground by another wellhole 3.
(5) after first section of sieve aperture has washed away, realize washing away operation by steel pipe movement chock plug to second segment sieve aperture.
(6) repeat above-mentioned steps (5) to horizontal segment to realize washing away operation completely.
(6) straight well 8 installs water filling sealer additional, installs auto-excitation type mechanical type fluid pulse generator under water filling sealer additional, to improve scouring effect, also can add air injection, forms bubble, produces Lianxian and gas lift.
(7) water-coal-slurry flows out ground under pressure certainly by horizontal well 3, also can install coal slurry lifting means 6 additional and be promoted to ground, well head installs gas, coal, water separation device 7, coal after separation and coal bed gas are collected and are stored into coal bed gas extraction equipment 10, and water is reused for down-hole jet stream by high-pressure hydraulic pump 9, is washed away again.
Horizontally-butted wells sluicing migration release extinction gas production method of the present invention, utilize piston end socket to move at horizontal segment and realize horizontal well in segments operation, the method of adopt High-Pressure Water to wash away, to spray, migrating obtains and expands horizontal segment discharge channel,, achieve coal gas and adopt altogether, shorten construction period simultaneously, be conducive to reducing coal seam reservoirs injury, increase gas permeability of coal seam, create favorable conditions to the release of inside, coal seam, coal bed gas release and flowing, add the extraction efficiency of coal bed gas.Generally speaking, the technique of the method is comparatively simple, and cost is lower, for soft, hypotonic, that height dashes forward coal seam reservoirs gas extinction and coal bed gas extraction provide new solution.
Claims (5)
1. horizontally-butted wells sluicing migration release extinction gas production method, comprises following step, it is characterized in that:
Step 1, is drilled with straight well (8) in precalculated position, this well is crept into by ground (1), to target coal seam (2) base plate, and the above cased hole completion of roof, the following barefoot completion of roof;
Step 2, construction level well (3) docks with straight well (8), determines well, transfer screen casing (15) at horizontal segment (5) at straight well (8) and inclination section (4) sleeve pipe, ensures that Butt Section is unimpeded, prevents blocking, and sieve aperture (14) should be large, to reduce fluid resistance;
Step 3, transfers continuous play pipe (13) at net horizontal section (5), and top installs piston end socket (12) additional, and material should have self lubricity, and effect is by screen casing (15) segmentation;
Step 4, injects large discharge high water head clear water at straight well (8), washes away coal dust by sieve aperture (14), forms coal dust slurry, and drains into ground by another wellhole (3), realize coal gas and adopt altogether;
Step 5, after first section of sieve aperture has washed away, has realized washing away operation by steel pipe movement chock plug to second segment sieve aperture;
Step 6, repeats above-mentioned steps (5) to horizontal segment and realizes washing away operation completely;
Step 7, straight well (8) installs water filling sealer additional, installs auto-excitation type mechanical type fluid pulse generator under water filling sealer additional, to improve scouring effect, also can add air injection, forms bubble, produces Lianxian and gas lift;
Step 8, water-coal-slurry flows out ground under pressure certainly by horizontal well (3), also can install coal slurry lifting means (6) additional and be promoted to ground, well head installs gas, coal, water separation device (7), coal after separation and coal bed gas are collected and are stored into coal bed gas extraction equipment (10), and water is reused for down-hole jet stream by high-pressure hydraulic pump (9), is washed away again;
Step 9, water filling and wet well can exchange, and when water injection of horizontal well, straight well draining, straight well Jing Fu can establish coal store, install lifting appliance additional and promote;
Step 10, can realize multiple horizontal well and dock with a straight well, should determine level docking Distance geometry horizontal well space layout depending on geological conditions.
2. horizontally-butted wells sluicing migration release extinction gas production method as claimed in claim 1, is characterized in that: the selection of described mining straight well (8) and multiple horizontally-butted wells (3) pithead position is depending on coalfield landform, coal seam and gas bearing condition.
3. horizontally-butted wells sluicing migration release extinction gas production method as claimed in claim 1, it is characterized in that: transfer screen casing (15) and continuous play pipe (13) at horizontal segment (5), screen casing (15) is with sieve aperture (14), continuous play pipe (13) top installs piston end socket (12) additional, sieve aperture (14) is by screen casing (15) segmentation, segmentation can be realized by continuous play pipe (13) mobile end socket (12) position and wash away operation, form discharge space, realize the object of extinction and gas production.
4. horizontally-butted wells sluicing migration release extinction gas production method as claimed in claim 1, is characterized in that: water filling and wet well can exchange.
5. horizontally-butted wells sluicing migration release extinction gas production method as claimed in claim 1, is characterized in that: can realize coal gas and adopt altogether.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN108825195A (en) * | 2018-04-28 | 2018-11-16 | 中国矿业大学 | A kind of coal bed gas horizontal well collapse hole makes cave release development system and method |
| CN112227985A (en) * | 2020-10-12 | 2021-01-15 | 中国科学院武汉岩土力学研究所 | Ultra-deep salt mine butt-joint well bittern-mining full-horizontal-section groove expanding method |
| CN113605874A (en) * | 2021-08-10 | 2021-11-05 | 山西蓝焰煤层气集团有限责任公司 | Method for extracting coal bed gas of broken soft coal bed top and bottom double-layer horizontal well |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6244338B1 (en) * | 1998-06-23 | 2001-06-12 | The University Of Wyoming Research Corp., | System for improving coalbed gas production |
| US20050103490A1 (en) * | 2003-11-17 | 2005-05-19 | Pauley Steven R. | Multi-purpose well bores and method for accessing a subterranean zone from the surface |
| 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 |
| WO2011000089A1 (en) * | 2009-07-02 | 2011-01-06 | Gasfrac Energy Services Inc . | Methods of fracturing hydrocarbon reservoirs |
| CN102425397A (en) * | 2011-12-29 | 2012-04-25 | 郑州大学 | 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) * | 2011-12-29 | 2012-06-27 | 郑州大学 | Method for mining coal bed gas by hydraulic washout of butted well in manner of pressure relief |
| CN103603643A (en) * | 2013-11-26 | 2014-02-26 | 中国石油集团长城钻探工程有限公司 | Coal bed gas U-shaped well staged fracturing exploitation technology |
-
2014
- 2014-03-14 CN CN201410093641.6A patent/CN104912520B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6244338B1 (en) * | 1998-06-23 | 2001-06-12 | The University Of Wyoming Research Corp., | System for improving coalbed gas production |
| US20050103490A1 (en) * | 2003-11-17 | 2005-05-19 | Pauley Steven R. | Multi-purpose well bores and method for accessing a subterranean zone from the surface |
| WO2011000089A1 (en) * | 2009-07-02 | 2011-01-06 | Gasfrac Energy Services Inc . | Methods of fracturing hydrocarbon reservoirs |
| 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 |
| CN102425397A (en) * | 2011-12-29 | 2012-04-25 | 郑州大学 | 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) * | 2011-12-29 | 2012-06-27 | 郑州大学 | Method for mining coal bed gas by hydraulic washout of butted well in manner of pressure relief |
| CN103603643A (en) * | 2013-11-26 | 2014-02-26 | 中国石油集团长城钻探工程有限公司 | Coal bed gas U-shaped well staged fracturing exploitation technology |
Non-Patent Citations (2)
| Title |
|---|
| 冯立杰等: "对接井水力运移卸压开采煤层气方法的探讨", 《中国煤层气》 * |
| 刘营等: "水力喷砂分段压裂工艺在U 型煤层气井中的应用", 《钻采工艺》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN108825195A (en) * | 2018-04-28 | 2018-11-16 | 中国矿业大学 | A kind of coal bed gas horizontal well collapse hole makes cave release development system and method |
| CN112227985A (en) * | 2020-10-12 | 2021-01-15 | 中国科学院武汉岩土力学研究所 | Ultra-deep salt mine butt-joint well bittern-mining full-horizontal-section groove expanding method |
| CN113605874A (en) * | 2021-08-10 | 2021-11-05 | 山西蓝焰煤层气集团有限责任公司 | Method for extracting coal bed gas of broken soft coal bed top and bottom double-layer horizontal well |
| CN113605874B (en) * | 2021-08-10 | 2023-02-10 | 山西蓝焰煤层气集团有限责任公司 | Method for extracting coal bed gas of broken soft coal bed top and bottom double-layer horizontal well |
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