CN101775975A - Method for exploiting coal bed gas by hydraulic drilling and pressure relieving - Google Patents
Method for exploiting coal bed gas by hydraulic drilling and pressure relieving Download PDFInfo
- Publication number
- CN101775975A CN101775975A CN201010102300A CN201010102300A CN101775975A CN 101775975 A CN101775975 A CN 101775975A CN 201010102300 A CN201010102300 A CN 201010102300A CN 201010102300 A CN201010102300 A CN 201010102300A CN 101775975 A CN101775975 A CN 101775975A
- Authority
- CN
- China
- Prior art keywords
- coal
- bed gas
- well
- coal bed
- water
- 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
Links
Landscapes
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention discloses a method for exploiting coal bed gas by hydraulic drilling and pressure relieving. The method comprises the following steps of: drilling a large-caliber well to the coal bed(9), building a coal bed gas exploitation well(1) capable of adding water, discharging water and discharging gas, making a sleeve pipe(2) arranged on the drilling well, and performing mechanical drilling at the bottom of the well; making a well-sealing device arranged on an opening of the coal bed gas exploitation well(1), and making a ground water pump(3), a coal-water separating device(4) and a gas storage device(5) arranged; distributing water-discharging devices(8) and flushing robots(6) on both sides in the coal bed gas exploitation well(1), wherein the flushing robots(6) are connected with the ground water pump(3) by soft water pipes and can continuously flush the coal down in caves at the bottom of the well to form a pressure relieving space(7); discharging the coal-water mixture to the coal-water separating device(4) by the water-discharging devices(8); and discharging the coal bed gas continuously generated by the coal bed(9) after pressure relieving to the gas storage device(5) by the coal bed gas exploitation well(1). The method has the advantages of easily solving the problem of early exploiting the coal bed gas in the coal mass with looseness, extremely low permeability and high bursting, eliminating bursting risk and lowering a gas content of the coal mass.
Description
Technical field
The present invention relates to the coal-bed gas exploitation technical field, a kind of method for exploiting coal bed gas by hydraulic drilling and pressure relieving of particularly soft, hypotonic, the high coal seam reservoirs of dashing forward.
Background technology
The Henan Province Ying consolidates, coal seam, area, Dengfeng, and complex structure, ature of coal are soft, based on the ductile deformation, mainly cause by interformational sliding, and be the product of intense plastic strain.Strong structure destruction makes coal body be flakey or earthy, and permeability extreme difference (all below 0.001mD) generally has the characteristic of soft, hypotonic, high gas and better storage condition again because of it, often coal and gas burst region.The coal bed gas of, hyposmosis soft for this type of, high gas, high prominent coal seam reservoirs, effective surface mining method in advance not also adopts known straight well pressure break and cluster well method poor effect at present, has seriously restricted the exploitation in this type of coalfield.
In the known cbm development technology, often relate in the coal seam of cbm development well by instrument reaming hole mode or negative pressure mode or blasting method reaming and draw the cave, form in the coal seam, shaft bottom and unload nip, increase the gas permeability in crack, coal seam, improve methane output.A kind of injecting type reaming hole digging device as Chinese patent ZL 200620032323.X introduces comprises joint and reaming hole digging knife, and hinge connects between the two, and the cave diameter depends on the length of reaming hole digging knife.The blasting type cave well completion technological method of coal layer gas well of Chinese patent ZL 200610047360.2 introductions comprises that cave explosion shaping, cave form detect, drag for bits three big technical essentials for another example, adopts the explosive initiation cavitation, and the clear method of considering to be worth doing in down-hole is finished then.
Above technology to draw the cave diameter limited, and have the factor of dangerous and environment pollution in various degree, be not suitable for the cbm development of soft, hypotonic, high gas, high prominent coal seam reservoirs.
Summary of the invention
Purpose of the present invention provides a kind of method for exploiting coal bed gas by hydraulic drilling and pressure relieving at the prior art deficiency just.This technology has solved the key technology difficult problem of soft, hypotonic, high gas, high outstanding coal seam reservoirs coal seam development technology.
Purpose of the present invention can realize by following technique measures (step):
(1) the coal-bed gas exploitation well is set.Adopt large-diameter drill, pass roof enter the coal seam a little, the coal-bed gas exploitation well of an energy water filling, draining are set, giving vent to anger; Add tubing to roof around wellhole, sleeve pipe adopts known method to fixedly connected with the coal seam with overlying strata.
(2) machinery is drawn the cave.After aforementioned coal-bed gas exploitation well is finished, utilize existing machinery to draw the cave instrument drilling well underlying seam is drawn the cave, the cave is big as far as possible.
(3) transfer the bath robot.Finish in aforementioned cave, transfers explosion-proof submersible bath robot to the cave from aforementioned coal-bed gas exploitation well one side, and robot is communicated with the ground water pump by soft water pipe.
(4) dewatering installation is installed.Finish in aforementioned cave, at aforementioned coal-bed gas exploitation well opposite side dewatering installation is installed, and dewatering installation is to arrange the deep well pump of coal water or submersible pump etc.
(5) closing device.The big diameter borehole of aforementioned coal-bed gas exploitation well installs the shut-in well device additional, and can pass through gutter, water filling flexible pipe, escape pipe, guarantees the smooth draining of dewatering installation, and the water outlet robot supplies water smoothly, the smooth extraction of coal bed gas.
(6) waterpower is drawn the cave.The ground water pump is that aforementioned bath robot supplies water by soft water pipe, and bath robot shooting current form discharge space towards the coal breakage body.The bath robot takes the discharge pipe line aforementioned discharge space edge that crawls toward and continues the bath operation, enlarges discharge space.
(7) Pai Meishui.Aforementioned bath robot dashes the coal-water mixture that falls and compiles aforementioned discharge space bottom, drains into ground by dewatering installation.
(8) moisture content of coal from.The coal-water mixture of discharging separates from device through moisture content of coal, and isolated water circulation use injects the ground water pump.
(9) gas production.Floor mounted stores the coal bed gas device, and the coal seam output coal bed gas after the release exports to the ground caisson by drilling well.
Beneficial effect of the present invention is as follows:
Method for exploiting coal bed gas by hydraulic drilling and pressure relieving of the present invention, down-hole are drawn discharge space that make in the cave and are strengthened, and draw the professed machine reaming equipment that the cave need not the manufacturing structure complexity, existing drainage plant and high-pressure water jet method just can realize, easy construction, the common laborer can finish, and saves cost; This method has overcome the adverse effect that characteristics such as the coal seam is soft, hypotonic, high gas bring for conventional coal-bed gas exploitation technology; Adopt this type of coal seam technical support is provided for national large-scale commercial applications melts.
Description of drawings
Fig. 1 is a technology schematic diagram of the present invention;
Be labeled as among the figure: 1: the coal-bed gas exploitation well; 2: sleeve pipe; 3: the ground water pump; 4: moisture content of coal is from device; 5: caisson; 6: the bath robot; 7: discharge space; 8: dewatering installation; 9: the coal seam.
Solid arrow is a water (flow) direction among the figure; Dotted arrow is an airflow direction.
The specific embodiment
The present invention is further described below with reference to an embodiment (accompanying drawing):
As shown in the figure, method for exploiting coal bed gas by hydraulic drilling and pressure relieving of the present invention comprises following several steps:
(1) coal-bed gas exploitation well 1 is set.Adopt large-diameter drill, pass roof enter coal seam 9 a little, the coal-bed gas exploitation well 1 of an energy water filling, draining are set, giving vent to anger; Add tubing 2 to roof around wellhole, sleeve pipe 2 adopts known method to fixedly connected with coal seam 9 with overlying strata.
(2) machinery is drawn the cave.After described coal-bed gas exploitation well is finished, utilize existing machinery to draw the cave instrument cave is drawn in coal seam 9, the cave is big as far as possible.
(3) transfer bath robot 6.Finish in described cave, transfers explosion-proof submersible bath robot 6 to the cave from described coal-bed gas exploitation well 1 one sides, and bath robot 6 is communicated with ground water pump 3 by soft water pipe.
(4) dewatering installation 8 is installed.Finish in described cave, at described coal-bed gas exploitation well 1 opposite side dewatering installation 8 is installed, and dewatering installation 8 is to arrange the deep well pump of coal water or submersible pump etc.
(5) sealing well head.The big diameter borehole of described coal-bed gas exploitation well 1 installs the shut-in well device additional, and can pass through gutter, water filling flexible pipe, escape pipe, guarantees dewatering installation 8 smooth drainings, and bath robot 6 supplies water the smooth extraction of coal bed gas smoothly.
(6) waterpower is drawn the cave.Ground water pump 3 is that described bath robot 6 supplies water by soft water pipe, and bath robot 6 shooting current form discharge space 7 towards the coal breakage body.Bath robot 6 takes discharge pipe line described discharge space 7 edges that crawl toward and continues the bath operation, enlarges discharge space 7.
(7) Pai Meishui.Described bath robot 6 dashes the coal water that falls and compiles described discharge space 7 bottoms, drains into ground by dewatering installation 8.
(8) moisture content of coal from.The coal-water mixture of discharging separates from device 4 through moisture content of coal, and isolated water circulation use injects ground water pump 3.
(9) gas production.Floor mounted stores the coal bed gas device, and the coal seam 9 output coal bed gas after the release export to ground caisson 5 by drilling well.
Claims (7)
1. method for exploiting coal bed gas by hydraulic drilling and pressure relieving, with large-diameter drill a coal-bed gas exploitation well (1) is set, drilling well adds tubing (2), carry out machinery in the shaft bottom and draw the cave, it is characterized in that: coal-bed gas exploitation well (1) can not only be gathered coal bed gas, and can water filling, draining, three kinds of situations can be carried out simultaneously.
2. method for exploiting coal bed gas by hydraulic drilling and pressure relieving as claimed in claim 1 is characterized in that: coal-bed gas exploitation well (1) well head is provided with water filling ground water pump (3), and moisture content of coal is from device (4), caisson (5).
3. method for exploiting coal bed gas by hydraulic drilling and pressure relieving as claimed in claim 1 or 2 is characterized in that: coal-bed gas exploitation well (1) well head installs the shut-in well device additional, and can guarantee carrying out smoothly of water filling, draining, gas production.
4. method for exploiting coal bed gas by hydraulic drilling and pressure relieving as claimed in claim 1 is characterized in that: machinery is drawn after the cave finishes, and transfers bath robot (6) to the cave, and bath robot (6) is communicated with ground water pump (3) by soft water pipe.
5. as claim 1 or 3 described method for exploiting coal bed gas by hydraulic drilling and pressure relieving, it is characterized in that: bath robot (6) continues in the cave towards the coal breakage body, forms discharge space (7).
6. method for exploiting coal bed gas by hydraulic drilling and pressure relieving as claimed in claim 1, it is characterized in that: dewatering installation (8) is installed in coal-bed gas exploitation well (1), the robot (6) that will wash by water dashes the coal-water mixture that falls and drains into ground, separates from device (4) through moisture content of coal.
7. method for exploiting coal bed gas by hydraulic drilling and pressure relieving as claimed in claim 1 is characterized in that: the coal seam after the release (9) are the output coal bed gas constantly, exports to ground caisson (5) through coal-bed gas exploitation well (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010102300A CN101775975A (en) | 2010-01-28 | 2010-01-28 | Method for exploiting coal bed gas by hydraulic drilling and pressure relieving |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010102300A CN101775975A (en) | 2010-01-28 | 2010-01-28 | Method for exploiting coal bed gas by hydraulic drilling and pressure relieving |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101775975A true CN101775975A (en) | 2010-07-14 |
Family
ID=42512543
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010102300A Pending CN101775975A (en) | 2010-01-28 | 2010-01-28 | Method for exploiting coal bed gas by hydraulic drilling and pressure relieving |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101775975A (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102116140A (en) * | 2011-01-25 | 2011-07-06 | 煤炭科学研究总院西安研究院 | Construction method for enhancing extraction effect of ground coal bed gas |
| CN102410002A (en) * | 2011-12-29 | 2012-04-11 | 郑州大学 | Vertical shaft chain bucket coal-water drainage and gas recovery method |
| CN102518412A (en) * | 2011-12-29 | 2012-06-27 | 郑州大学 | Method for mining coal and gas by hydraulic jet grouting washout |
| CN102777183A (en) * | 2012-07-24 | 2012-11-14 | 河南理工大学 | Hydraulic coal mining process for bottom plate roadway |
| CN103061734A (en) * | 2013-01-06 | 2013-04-24 | 河南理工大学 | Method for chemically making cave of open hole of gas well of coal seam |
| CN104213896A (en) * | 2014-09-01 | 2014-12-17 | 中国石油大学(北京) | Fracturing and cavern integrated completion method for coal-bed gas reservoir |
| WO2015000446A1 (en) * | 2013-07-03 | 2015-01-08 | 胜利油田隆迪石油技术(装备)有限责任公司 | Method and device for extracting coalbed methane by discharging water and coal fines |
| 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 |
| CN107476783A (en) * | 2016-06-08 | 2017-12-15 | 中国石油天然气股份有限公司 | Method for improving coal bed gas reservoir of bottom plate developed ragged coal |
| CN108798630A (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 simulation experiment system |
| 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 |
| 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 |
| CN115306369A (en) * | 2022-08-25 | 2022-11-08 | 山西省煤炭地质勘查研究院 | Structure and mining process of coal bed gas digging cave well |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1910339A (en) * | 2003-11-17 | 2007-02-07 | Cdx天然气有限公司 | Multi-purpose well bores and method for accessing a subterranean zone from the surface |
| CN101166888A (en) * | 2004-12-21 | 2008-04-23 | Cdx天然气有限公司 | Accessing subterranean resources by formation collapse |
| US20080202757A1 (en) * | 2007-02-27 | 2008-08-28 | Conocophillips Company | Method of stimulating a coalbed methane well |
| US7431084B1 (en) * | 2006-09-11 | 2008-10-07 | The Regents Of The University Of California | Production of hydrogen from underground coal gasification |
| US20090255732A1 (en) * | 2008-04-14 | 2009-10-15 | Peters Jasper N | Method and apparatus for lateral well drilling with enhanced capability for clearing cuttings and other particles |
-
2010
- 2010-01-28 CN CN201010102300A patent/CN101775975A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1910339A (en) * | 2003-11-17 | 2007-02-07 | Cdx天然气有限公司 | Multi-purpose well bores and method for accessing a subterranean zone from the surface |
| CN101166888A (en) * | 2004-12-21 | 2008-04-23 | Cdx天然气有限公司 | Accessing subterranean resources by formation collapse |
| US7431084B1 (en) * | 2006-09-11 | 2008-10-07 | The Regents Of The University Of California | Production of hydrogen from underground coal gasification |
| US20080202757A1 (en) * | 2007-02-27 | 2008-08-28 | Conocophillips Company | Method of stimulating a coalbed methane well |
| US20090255732A1 (en) * | 2008-04-14 | 2009-10-15 | Peters Jasper N | Method and apparatus for lateral well drilling with enhanced capability for clearing cuttings and other particles |
Non-Patent Citations (1)
| Title |
|---|
| 鲜保安,等: "裸眼洞穴完井技术及作用机理分析", 《中国煤层气》 * |
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102116140A (en) * | 2011-01-25 | 2011-07-06 | 煤炭科学研究总院西安研究院 | Construction method for enhancing extraction effect of ground coal bed gas |
| CN102410002A (en) * | 2011-12-29 | 2012-04-11 | 郑州大学 | Vertical shaft chain bucket coal-water drainage and gas recovery method |
| CN102518412A (en) * | 2011-12-29 | 2012-06-27 | 郑州大学 | Method for mining coal and gas by hydraulic jet grouting washout |
| CN102777183A (en) * | 2012-07-24 | 2012-11-14 | 河南理工大学 | Hydraulic coal mining process for bottom plate roadway |
| CN103061734B (en) * | 2013-01-06 | 2016-04-20 | 山西蓝焰煤层气集团有限责任公司 | A kind of coal bed gas well bore hole chemistry makes cave method |
| CN103061734A (en) * | 2013-01-06 | 2013-04-24 | 河南理工大学 | Method for chemically making cave of open hole of gas well of coal seam |
| WO2015000446A1 (en) * | 2013-07-03 | 2015-01-08 | 胜利油田隆迪石油技术(装备)有限责任公司 | Method and device for extracting coalbed methane by discharging water and coal fines |
| US9850744B2 (en) | 2013-07-03 | 2017-12-26 | Shengli Longdi Petroleum Technology & Equpiment Co., Ltd. | Method for extracting coalbed gas through water and coal dust drainage and a device thereof |
| 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 |
| CN104213896A (en) * | 2014-09-01 | 2014-12-17 | 中国石油大学(北京) | Fracturing and cavern integrated completion method for coal-bed gas reservoir |
| CN107476783B (en) * | 2016-06-08 | 2019-09-06 | 中国石油天然气股份有限公司 | Method for improving coal bed gas reservoir of bottom plate developed ragged coal |
| CN107476783A (en) * | 2016-06-08 | 2017-12-15 | 中国石油天然气股份有限公司 | Method for improving coal bed gas reservoir of bottom plate developed ragged coal |
| CN108798630A (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 simulation experiment system |
| 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 |
| 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 |
| 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 |
| CN108798630B (en) * | 2018-04-28 | 2021-09-28 | 中国矿业大学 | Cave pressure relief mining simulation test system for tectonic coal in-situ coal bed gas horizontal well |
| CN115306369A (en) * | 2022-08-25 | 2022-11-08 | 山西省煤炭地质勘查研究院 | Structure and mining process of coal bed gas digging cave well |
| CN115306369B (en) * | 2022-08-25 | 2024-04-26 | 山西省煤炭地质勘查研究院有限公司 | Structure of coal bed gas hole digging well and exploitation process |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101775975A (en) | Method for exploiting coal bed gas by hydraulic drilling and pressure relieving | |
| CN110397428B (en) | Displacement coalbed methane yield increasing method for coalbed methane jointly mined by vertical well and U-shaped butt well | |
| CN106988719B (en) | Anti-reflection system and anti-reflection method for circularly injecting hot water and liquid nitrogen into coal seam | |
| CN108798608B (en) | Natural gas hydrate exploitation system and method | |
| CN110644963B (en) | Method for exploiting hydrate based on multilateral well | |
| CN102518411A (en) | Method for mining coal bed gas by hydraulic washout of butted well in manner of pressure relief | |
| CN104948143B (en) | The recovery method and its quarrying apparatus of a kind of submarine surface gas hydrates | |
| CN103790589B (en) | Transition connection mining technique from outdoor mine to underground mine | |
| CN104405283A (en) | Technique for extracting gas from L-shaped ground drilling well in mining area | |
| CN101775974B (en) | Method for exploiting coal bed methane (CBM) by water transportation and pressure relief in butted well | |
| CN108678671A (en) | A kind of sea bed gas hydrate digging sleeve type injection retracting device | |
| 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 | |
| CN104763368A (en) | Orifice seal device for large-diameter downhole hammer and reverse circulation construction technology for orifice seal device | |
| CN112796714B (en) | Multistage controllable water jet flow crushing cavity-making tool for natural gas hydrate development | |
| CN102518412A (en) | Method for mining coal and gas by hydraulic jet grouting washout | |
| CN103742188B (en) | Colliery drawing-off gas well and boring method | |
| CN109763771B (en) | Dual-gradient drilling system based on continuous oil pipe electric drive | |
| CN105804786B (en) | A kind of weak seam bottom plate layer-through drilling pressure rushes anti-reflection method | |
| CN102787833A (en) | Hydraulic fracturing surging method for bedrock well and system device thereof | |
| CN102865104A (en) | Downward extraction drilling drainage device | |
| CN106930746A (en) | The alternative expression coal seam anti-reflection method that drilling acetone invasion and attack are combined with hydraulic fracturing | |
| CN109057757B (en) | Natural gas hydrate exploitation method and device | |
| CN104265357B (en) | Anti-burst method is taken out in a kind of strong prominent coal seam in advance | |
| CN210422616U (en) | Mining and goaf backfilling device for sea area massive natural gas hydrate | |
| CN103195470A (en) | Gas discharge collecting device for drilling construction |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20100714 |