CN104912520B - Horizontally-butted wells sluicing migration release extinction gas production method - Google Patents
Horizontally-butted wells sluicing migration release extinction gas production method Download PDFInfo
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- CN104912520B CN104912520B CN201410093641.6A CN201410093641A CN104912520B CN 104912520 B CN104912520 B CN 104912520B CN 201410093641 A CN201410093641 A CN 201410093641A CN 104912520 B CN104912520 B CN 104912520B
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Abstract
Horizontally-butted wells sluicing migration release extinction gas production method disclosed by the invention, first, is drilled with straight well（8）, roof above cased hole completion, the following barefoot completion of roof；It is drilled with horizontally-butted wells（3）Inclination section（4）And setting of casing is cemented the well；Then, with the drilled horizontal segment of conventional meanses（5）Passage, with straight well（8）Docking, barefoot completion；In horizontal segment（5）Transfer screen casing（15）With continuous play pipe（13）, screen casing（15）With sieve aperture（14）, continuous play pipe（13）Top installs piston end socket additional（12）；To straight well（8）Big flow high water head clear water is continuously injected into, passes through sieve aperture（14）Coal dust is washed away, forms coal dust slurry, mobile chock plug carries out repeating operation；Coal dust slurry is passed through into horizontal wellbore annular section（3）Drain into ground；Through gas, coal, water separation device（7）Separation, coal is gentle to be collected storage, and water circulation is used for down-hole jet stream, washed away.The present invention provides new solution method for soft, hypotonic coal seam ground release extinction gas production.
Description
Technical field
The present invention relates to the gas extinction of soft, hypotonic, high prominent coal seam reservoirs and coal bed gas extraction field, it is particularly suitable for coal
Powder solubization is good, runny coal seam under pressure.
Background technology
Mining of coal bed gas drilling technology is mainly peupendicular hole and horizontal well.Due to the influence of many reasons, China
Coalbed methane reservoir common manifestation is low pressure, hypotonic and low gas content saturation degree " three-lows " feature.The reservoir conditions of this " three-lows "
So that conventional ground straight well production technique gradually shows deficiency in the cbm development in China, can not obtain it is expected into
Effect.And cbm development facts have proved that horizontal well can effectively turn on the fissure system of coal seam reservoirs, increase gas and water flow conductivity,
Well yield and recovery ratio are increased substantially, is exploitation low pressure, the effective means of hypotonic regional coal bed gas resource, and level is docked
Well with its rational casing programme and unique completion mode, open by the coal bed gas for being more suitable for the most of conditions of coal bed gas reservoir of China
Hair.
The content of the invention
Problem of the present invention present in for the gas extinction of soft, hypotonic, high prominent coal seam reservoirs and coal bed gas extraction field,
With reference to the characteristics of horizontally-butted wells, using sluicing, migration technology, there is provided a kind of horizontally-butted wells sluicing migration release
Extinction gas production method.
The purpose of the present invention can be realized by following technique measures (step)：
(1) straight well is drilled with precalculated position, the well is by earth drilling, to target coal seam bottom plate, roof above sleeve pipe
Completion, the following barefoot completion of roof.
(2) construction level well docks with straight well, determines well in straight well and inclination section sleeve pipe, transfers screen casing in horizontal segment, ensures
Butt Section is unimpeded, prevents from blocking, and sieve aperture is preferably big, to reduce fluid resistance.
(3) hollow or solid thin footpath high resiliency coiled tubing is transferred in horizontal segment, top installs plug envelope additional, and material should have from profit
Slip, effect are to be segmented screen casing, and moving plug envelope position by coiled tubing can realize that operation is washed away in segmentation, and it is empty to form release
Between, realize the purpose of extinction and gas production；Also coiled tubing can not be filled, screen casing one end is blocked in advance, integrally washes away operation.
(4) big flow high water head clear water is injected in straight well, coal dust is washed away by sieve aperture, form coal dust slurry, and pass through level
The wellhole of well drains into ground, realizes that coal gas is adopted altogether.
(5) straight well installs water filling sealer additional, the mechanical fluid pulse generator of auto-excitation type is installed additional under water filling sealer, to carry
High scouring effect, gas can be also filled, form gas explosion and gas lift.
(6) coal dust slurry also can set coal by horizontal well (3) under pressure from outflow ground in aforementioned levels well
Water extraction rises equipment lifting to ground, well head installation gas, coal, water separation device, the coal water lifting means typically using electric submersible pump,
Gaslift membrane pump, rope lift bucket, screw pump, jet migration equipment etc., the water circulation injection straight well after separation.
(7) when water injection of horizontal well, straight well draining, straight well Jing Fu can set coal store, install lifting device lifting additional.
(8) if to go out ground not smooth for coal dust slurry, can be arranged in straight well by pump, the external force means lifting coal such as jet lifting
Slurry.
(9) present invention can realize that multiple horizontal wells dock with a straight well, should regard geological conditions determine horizontal docking away from
From with horizontal well space layout.
Beneficial effects of the present invention are as follows：
Horizontally-butted wells sluicing migration release extinction gas production method of the present invention, piston is utilized in horizontal segment
Horizontal well in segments operation is realized in end socket movement, and the method washed away using High-Pressure Water, spray, migrated is obtained and expands horizontal segment
Discharge channel, realize coal gas and adopt altogether, while shorten construction period, advantageously reduce coal seam reservoirs injury, increase coal seam is breathed freely
Property, created favorable conditions to release, coal bed gas release and flowing inside coal seam, add the extraction efficiency of coal bed gas.
Brief description of the drawings
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.
In figure mark for：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：Continuously
Oil pipe；14：Sieve aperture；15：Screen casing.
Solid arrow is water (flow) direction in figure；Dotted arrow is coal bed gas airflow direction.
Embodiment
The present invention is further described below with reference to one embodiment (accompanying drawing)：
As shown in Figure 1, Figure 2, Figure 3, Figure 4, horizontally-butted wells sluicing of the invention migration release extinction gas production method
Specific implementation step is as follows：
(1) straight well 8 is drilled with precalculated position, the well is crept into by ground 1, to the bottom plate of target coal seam 2, more than roof is covered
Pipe completion, the following barefoot completion of roof.
(2) construction level well 3 is docked with straight well 8, determines well in straight well 8 and the sleeve pipe of inclination section 4, and screen casing is transferred in horizontal segment 5
15, ensure that Butt Section is unimpeded, prevent from blocking, sieve aperture 14 is preferably big, to reduce fluid resistance.
(3) coiled tubing 13 is transferred in horizontal segment 5, top installs plug envelope 12 additional, and material there should be self lubricity, and effect is to sieve
Pipe 15 is segmented.
(4) big flow high water head clear water is injected in straight well 8, coal dust is washed away by sieve aperture 14, form coal dust slurry, and pass through water
The wellhole of horizontal well 3 drains into ground.
(5) after the completion for the treatment of that first section sieve aperture washes away, move plug by coiled tubing and be sealed to second segment sieve aperture and realize and wash away operation.
(6) repeat the above steps 5 to horizontal segment realize wash away operation completely.
(7) straight well 8 installs water filling sealer additional, and the mechanical fluid pulse generator of auto-excitation type is installed additional under water filling sealer, with
Scouring effect is improved, can also fill air, forms bubble, produces Lianxian and gas lift.
(8) coal dust slurry can also install coal slurry lifting means 6 additional and be lifted by horizontal well 3 under pressure from outflow ground
To ground, well head installation gas, coal, water separation device 7, coal and coal bed gas after separation, which are collected, is stored into coal bed gas extraction equipment
10, water is reused for down-hole jet stream further through high-pressure hydraulic pump 9, washed away.
Horizontally-butted wells sluicing migration release extinction gas production method of the present invention, piston is utilized in horizontal segment
Horizontal well in segments operation is realized in end socket movement, and the method washed away using High-Pressure Water, spray, migrated is obtained and expands horizontal segment
Discharge channel, realize coal gas and adopt altogether, while shorten construction period, advantageously reduce coal seam reservoirs injury, increase coal seam is breathed freely
Property, created favorable conditions to release, coal bed gas release and flowing inside coal seam, add the extraction efficiency of coal bed gas.For total
It, the technique of this method is simpler, and cost is relatively low, is carried for the gas extinction and coal bed gas extraction of soft, hypotonic, high prominent coal seam reservoirs
New solution method is supplied.
Claims (3)
- The release extinction gas production method 1. horizontally-butted wells sluicing is migrated, including following steps, it is characterised in that：Step 1, straight well (8) is drilled with precalculated position, the well is crept into by ground (1), to target coal seam (2) bottom plate, roof Above cased hole completion, the following barefoot completion of roof；Step 2, construction level well (3) docks with straight well (8), well is determined in straight well (8) and inclination section (4) sleeve pipe, in horizontal segment (5) Screen casing (15) is transferred, ensures that Butt Section is unimpeded, prevents from blocking, sieve aperture (14) is preferably big, to reduce fluid resistance；Step 3, plug envelope (12) is installed additional on horizontal segment (5) decentralization coiled tubing (13), top, material there should be self lubricity, act on It is to be segmented screen casing (15)；Step 4, big flow high water head clear water is injected in straight well (8), coal dust is washed away by sieve aperture (14), form coal dust slurry, and lead to The wellhole for crossing horizontal well (3) drains into ground, realizes that coal gas is adopted altogether；Step 5, after the completion for the treatment of that first section sieve aperture washes away, move plug by coiled tubing and be sealed to second segment sieve aperture and realize and wash away operation；Step 6, repeat the above steps 5 to horizontal segment realize wash away operation completely；Step 7, straight well (8) installs water filling sealer additional, and the mechanical fluid pulse generator of auto-excitation type is installed additional under water filling sealer, with Scouring effect is improved, fills air, forms bubble, produces Lianxian and gas lift；Step 8, coal dust slurry installs coal slurry lifting means (6) additional and is promoted to by horizontal well (3) under pressure from outflow ground Ground, well head installation gas, coal, water separation device (7), coal and coal bed gas after separation, which are collected, is stored into coal bed gas extraction equipment (10), water is reused for down-hole jet stream further through high-pressure hydraulic pump (9), washed away；Step 9, when water injection of horizontal well, straight well draining, straight well Jing Fu sets coal store, installs lifting device lifting additional；Step 10, realize that multiple horizontal wells dock with a straight well, geological conditions should be regarded and determine horizontal docking distance and horizontal well Space layout.
- The release extinction gas production method 2. horizontally-butted wells sluicing as claimed in claim 1 is migrated, it is characterised in that：It is described The selection of straight well (8) and multiple horizontal wells (3) pithead position is depending on coalfield landform, coal seam and gas bearing condition.
- The release extinction gas production method 3. horizontally-butted wells sluicing as claimed in claim 1 is migrated, it is characterised in that：In water Flat section (5) decentralization screen casing (15) and coiled tubing (13), screen casing (15) carry sieve aperture (14), and coiled tubing (13) top installs plug additional Seal (12), screen casing (15) is segmented by sieve aperture (14), can realize that segmentation is washed away by mobile plug envelope (12) position of coiled tubing (13) Operation, form discharge space.
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108798516B (en) * | 2018-04-28 | 2020-08-04 | 中国矿业大学 | Cave pressure relief mining method for tectonic coal in-situ coal bed gas horizontal well |
| 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 |
| CN112227985B (en) * | 2020-10-12 | 2021-10-22 | 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 |
| 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 |
Citations (5)
| 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 |
| 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 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7100687B2 (en) * | 2003-11-17 | 2006-09-05 | Cdx Gas, Llc | 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 |
-
2014
- 2014-03-14 CN CN201410093641.6A patent/CN104912520B/en active Active
Patent Citations (5)
| 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 |
| 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 |
|---|
| 对接井水力运移卸压开采煤层气方法的探讨;冯立杰等;《中国煤层气》;20101031;第7卷(第5期);第10-13页 * |
| 水力喷砂分段压裂工艺在U 型煤层气井中的应用;刘营等;《钻采工艺》;20130228;第36卷(第2期);第62-64页 * |
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