CN103835748A - Method and device for surface well-drilling gas extraction - Google Patents
Method and device for surface well-drilling gas extraction Download PDFInfo
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- CN103835748A CN103835748A CN201410058059.6A CN201410058059A CN103835748A CN 103835748 A CN103835748 A CN 103835748A CN 201410058059 A CN201410058059 A CN 201410058059A CN 103835748 A CN103835748 A CN 103835748A
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Abstract
The invention belongs to the technical field of gas extraction and particularly relates to a method and a device for surface well-drilling gas extraction. The method comprises the steps of three time-zone extraction including before extraction, extraction duration and post-extraction. The device comprise a discharge and extraction pipe column assembly and an extraction tool assembly, a casing pipe adopts a casting pipe adjusting connection capable of performing radial and axial adjustment so that the casing pipe can have deflection and telescoping functions to adapt to 'three-zone' rock stratum movement and prevent breakage. The ground coal-bed gas well development and underground gas extraction are combined, so that coal-bed gas well have multiple purposes in one, namely the before extraction, extraction duration and post-extraction, and efficient coal-bed extraction is achieved.
Description
Technical field
The invention belongs to gas pumping technical field, be specifically related to a kind of method and device of CMM Surface Well Drilling.
Background technology
The colliery of current China 95% is underground mining, coal geological exploration complicated condition, and great gas hazard happens occasionally, and coal in China industry death toll accounts for the total death toll of global mine safety accidents 80% left and right according to statistics.According to statistics, from calendar year 2001 to 2010 year China's coal-mine security incident accumulative total occur in the of 27606, occur every year on average 2760.6, add up dead 47905 people, every year on average dead 4790.5 people simultaneously; The security incident accumulative total causing because of gas reason reaches 1495.To sum up, China because of mine safety accidents death toll a lot, and wherein gas is main " guilty person " of Safety of Coal Mine Production accident.Realize coal and coal bed gas resource harmony is adopted altogether, improve construction speed under coal mine, the fundamental way that reduces gas emission on getting working face is mash gas extraction.
Gas pumping is mainly divided into ground extraction and down-hole extraction at present, general ground extraction is mainly that to obtain cbm development commercial interest be target, its investor is mainly conventional oil company and venture capital investor, has proposed the slogan of " resource-safety-environment "; Down-hole extraction is mainly to administer gas on the other hand, and guarantee Safety of Coal Mine Production is target, and its investor is mainly taking colliery as main, advocates the Business concepts of " extraction-utilization-environmental protection ".Therefore, coal mine gas drainage is just paid close attention to the effect of gas control under normal circumstances, and cbm development company only focuses on commercial interest, does not consider the safety problem of colliery downhole production.For example, when colliery face is advanced to the postpone of ground coal bed gas well location, in order to catch up with construction speed, general colliery side can cut ground coal bed gas well and continue coal mining activity at the sleeve pipe of down-hole, bring economic loss so not only to the developer who is carrying out ground coal bed gas extraction, also make work plane push through after the down well placement of coal bed gas well place, very easily induce upper " three bands " strata movement and cause wellbore casing fracture, make ground coal bed gas well cannot extraction on pressure release gas in " three bands ", also cause carrying out goaf extraction.
To sum up, how by ground coal bed gas exploitation with underground gas extraction before adopting, adopt and adopt after three time zones effectively replace, become the key of coal mining gas production integrated technique.
Summary of the invention
The object of the invention is to overcome above-mentioned deficiency, a kind of method and device of taking out, adopt the CMM Surface Well Drilling of taking out after taking out, adopting before carrying out after planning area, colliery ground drilling that a well is multiplex and adopting is provided.
The technical solution adopted for the present invention to solve the technical problems is: a kind of method of CMM Surface Well Drilling, comprise three time zone extractions, it is characterized in that, one, take out before adopting: after planning area, colliery is drilled with well by ground in advance, be lowered to rigid casing 10 to 40-50 rice below the section of coal seam and cement the well, carry out mining operation after then descending rifle to penetrate out coal seam section pressure break; Two, adopt and take out: the first step, in the time that colliery face is advanced to ground coal bed gas well location and puts, the mining tubing string assembly 1 of ground coal bed gas well is extracted out; Second step, enters perforating gun from underground and penetrates out " three bands " district that coal bed gas is covered, and its distance is 35-50 pressure release coal seam, bottom doubly, then is lowered to an extraction instrument assembly 2 with packer 24; The 3rd step, utilizes well head extraction pump to implement " three bands " district's pressure release gas ground extraction; Three, adopting sky takes out: above carry after the interior extraction instrument assembly 2 of well, directly utilize well head gas pumping pump to implement negative pressure extraction.
In " three band " district and geostatic stress changes region employing adjusting sleeve union 9 greatly, described adjusting sleeve union 9 can be in axial and radiai adjustment, make sleeve pipe 10 there is drift angle, flexible function, to adapt to the movement of " three bands " rock stratum, prevent that sleeve pipe 10 from rupturing.
A device for CMM Surface Well Drilling, comprises mining tubing string assembly 1 and extraction instrument assembly 2, it is characterized in that, adopts the adjusting sleeve union 9 that can carry out radial and axial adjusting on sleeve pipe 10.
The described tubing string assembly 1 of adopting comprises oil pipe component 11, pump 12, screen casing 13 and plug 14, and pump 12 is connected to oil pipe component 11 lower ends, and screen casing 13 is connected to pump 12 belows, and oil pipe component 11 is positioned at 10 inside pipe casings, and screen casing 13 bottoms are used plug 14 to stop up.
Described extraction instrument assembly 2 comprises wellhead assembly 21, oil pipe 22, screen casing 23, packer 24 and plug 25, wellhead assembly 21 is positioned at ground, oil pipe 22 is positioned at below wellhead assembly 21, screen casing 23 is positioned at below oil pipe 22, plug 25 is positioned at below screen casing 23, and packer 24 is between screen casing 23 and plug 25.
Mining tubing string assembly 1 can carry out efficient gas-water separation, significantly extends pump detection period, meets the needs of adopting front ground coal bed gas steady production; Extraction instrument assembly 2 can seal pressure release coal seam section, ensures the high concentration extraction of pressure release gas; Adjusting sleeve union 9 can carry out radial and axial adjusting, prevents that geostatic stress effect setting of casing 10 from rupturing.
Beneficial effect of the present invention: combine with underground gas extraction by ground coal bed gas well development, take out before making that coal bed gas well one well is multiplex and adopting, adopt and take out, take out after adopting, realize the efficient extraction of coal bed gas, set up advanced person's Green Mine safely and efficiently; Can the make overall plans demand of interests separately of cbm development company and coal production side, the gas production of accomplishing to mine is integrated; Improve ground coal bed gas well capacity, reduced the risk of coal bed gas business development.
Below in conjunction with drawings and Examples, the invention will be further described.
Brief description of the drawings
Fig. 1 is the underground structure schematic diagram that the present invention adopts front extraction;
Fig. 2 is the mining tubing string assembly structure schematic diagram in apparatus of the present invention;
Fig. 3 is the underground structure schematic diagram that the present invention adopts extraction;
Fig. 4 is the structural representation of the extraction instrument assembly in apparatus of the present invention;
Fig. 5 is the underground structure schematic diagram that the present invention adopts sky extraction.
In figure 1, mining tubing string assembly, 2, extraction instrument assembly, 3, face, 4, working seam, 5, caving zone, 6, fissure zone, 7, bending subsidence band, 8, pressure release coal seam, 9, adjusting sleeve union, 10, sleeve pipe, 11, oil pipe component, 12, pump, 13, screen casing, 14, plug, 21, wellhead assembly, 22, oil pipe, 23, screen casing, 24, packer, 25, plug.
Detailed description of the invention
Referring to Fig. 1～Fig. 5, the method of a kind of CMM Surface Well Drilling that the present invention proposes, comprise three time zone extractions, it is characterized in that, one, take out before adopting: after planning area, colliery is drilled with well by ground in advance, be lowered to rigid casing to 40-50 rice below the section of coal seam and cement the well, carry out mining operation after then descending rifle to penetrate out coal seam section pressure break; Two, adopt and take out: the first step, in the time that colliery face is advanced to ground coal bed gas well location and puts, the mining tubing string assembly 1 of ground coal bed gas well is extracted out; Second step, enters perforating gun from underground and penetrates out " three bands " district that coal bed gas is covered, and its distance is the pressure release coal seam, bottom of 35-50 times, then is lowered to an extraction instrument assembly 2 with packer 24; The 3rd step, utilizes well head extraction pump to implement " three bands " district's pressure release gas ground extraction; Three, adopting sky takes out: above carry after the interior extraction instrument assembly 2 of well, directly utilize well head gas pumping pump to implement negative pressure extraction.
In " three band " district and geostatic stress changes region employing adjusting sleeve union 9 greatly, described adjusting sleeve union 9 can be in axial and radiai adjustment, make sleeve pipe 10 there is drift angle, flexible function, to adapt to the movement of " three bands " rock stratum, prevent that sleeve pipe 10 from rupturing.
A device for CMM Surface Well Drilling, comprises mining tubing string assembly 1 and extraction instrument assembly 2, it is characterized in that, adopts the adjusting sleeve union 9 that can carry out radial and axial adjusting on sleeve pipe 10.
The described tubing string assembly 1 of adopting comprises oil pipe component 11, pump 12, screen casing 13 and plug 14, and pump 12 is connected to oil pipe component 11 lower ends, and screen casing 13 is connected to pump 12 belows, and oil pipe component 11 is positioned at 10 inside pipe casings, and screen casing 13 bottoms are used plug 14 to stop up.
Described extraction instrument assembly 2 comprises wellhead assembly 21, oil pipe 22, screen casing 23, packer 24 and plug 25, wellhead assembly 21 is positioned at ground, oil pipe 22 is positioned at below wellhead assembly 21, screen casing 23 is positioned at below oil pipe 22, plug 25 is positioned at below screen casing 23, and packer 24 is between screen casing 23 and plug 25.
Fig. 1 is the underground structure schematic diagram that the present invention adopts front extraction, faced down by ground in planning area, colliery and punch finishing drilling after 40-50 rice below working seam 4, be lowered to the sleeve pipe 10 of adjusting sleeve union 9 and implement well cementation, implement again working seam 4 fracturing works, be finally lowered to mining tubing string assembly 1 and carry out the mining operation of working seam 4.
Mine from the bottom up in colliery, drive up to pressure release coal seam 8 from working seam 4, in the middle of it area distribution caving zone 5, fissure zone 6 and bending subsidence band 7.
Described pressure release coal seam 8 is not because the reason such as thickness, Coal Pore Structure is as coalbed methane reservoir development object.
Fig. 3 is the underground structure schematic diagram that the present invention adopts extraction, in the time that colliery face 3 is advanced to ground coal bed gas well location and puts, first the mining tubing string assembly 1 of ground coal bed gas well is extracted out, then from underground enter perforating gun penetrate out pressure release coal seam 8 and " three band " district, its distance is pressure release coal seam 8 thickness of 35-50 times, finally be lowered to extraction instrument assembly 2, utilize well head extraction pump to implement " three bands " district's pressure release gas ground extraction.Its extraction principle: due to extraction on mining face under mine a large amount of coal, thereby after face, form a huge goaf adopting, and in goaf, form a continuous pressure release region, the Direction distortion in pressure release region and displacement, on making at a distance, cover 8 pressure releases of pressure release coal seam, final under the effect of negative pressure on ground extraction, collect to pit shaft along the crack of covering each coal seam in pressure release, and can also carry out gas pumping to covering each pressure release coal seam at a distance.
Described extraction instrument assembly 2 concrete construction methods, first utilize and be lowered to hollow bridging plug to caving zone 5 bottoms on ground, and pitching suppresses and set, be then lowered to the screen casing 23 of bottom with plug 25, wellhead assembly 21 is finally installed on ground, is utilized extraction pump to carry out gas pumping.
Described perforated zone be pressure release coal seam 8 and under " three band " district, while noting perforation, need to avoid the position of adjusting sleeve union 9.
As shown in Figure 5, after the pressure release gas pumping in " three bands " district, above carry extraction instrument assembly 2 in pit shaft, ground is loaded onto extraction pump and is implemented goaf gas extraction.
In addition, it should be noted that, if colliery exploit from top to bottom, can be directly from ground toward down-hole coal column or the drilling well of work plane edge zone, before can implementing that a well is multiplex and adopting, take out, adopt and take out and adopt sky and take out, wherein adopting the pressure release gas of taking out is mainly not by the interval of pressure break.
Above-mentioned gas pumping technique is to illustrate simultaneously, and the not restriction to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here without also giving exhaustive to all embodiments.And the apparent variation of being amplified out thus or variation are still among the protection domain in patent of the present invention.
Claims (5)
1. a method for CMM Surface Well Drilling, comprises three time zone extractions, it is characterized in that,
One, take out before adopting: after planning area, colliery is drilled with well by ground in advance, be lowered to rigid casing (10) to the following 40-50 rice well cementation of coal seam section, carry out mining operation after then descending rifle to penetrate out coal seam section pressure break;
Two, adopt and take out: the first step, in the time that colliery face is advanced to ground coal bed gas well location and puts, the mining tubing string assembly (1) of ground coal bed gas well is extracted out; Second step, enters perforating gun from underground and penetrates out " three bands " district that coal bed gas is covered, and its distance is 35-50 pressure release coal seam, bottom doubly, then is lowered to the extraction instrument assembly (2) of a band packer (24); The 3rd step, utilizes well head extraction pump to implement " three bands " district's pressure release gas ground extraction;
Three, adopting sky takes out: above carry after the interior extraction instrument assembly (2) of well, directly utilize well head gas pumping pump to implement negative pressure extraction.
2. the method for a kind of CMM Surface Well Drilling according to claim 1, it is characterized in that, change region employing adjusting sleeve union (9) greatly in " three bands " district and geostatic stress, described adjusting sleeve union (9) can be in axial and radiai adjustment, makes sleeve pipe (10) have drift angle, flexible function.
3. a device for CMM Surface Well Drilling, comprises mining tubing string assembly (1) and extraction instrument assembly (2), it is characterized in that the adjusting sleeve union (9) that the upper employing of sleeve pipe (10) can be carried out radial and axial adjusting.
4. the device of a kind of CMM Surface Well Drilling according to claim 3, it is characterized in that, the described tubing string assembly (1) of adopting comprises oil pipe component (11), pump (12), screen casing (13) and plug (14), pump (12) is connected to oil pipe component (11) lower end, screen casing (13) is connected to pump (12) below, and oil pipe component (11) is positioned at (10) inside pipe casing, and screen casing (13) bottom is used plug (14) to stop up.
5. the device of a kind of CMM Surface Well Drilling according to claim 3, it is characterized in that, described extraction instrument assembly (2) comprises wellhead assembly (21), oil pipe (22), screen casing (23), packer (24) and plug (25), wellhead assembly (21) is positioned at ground, oil pipe (22) is positioned at wellhead assembly (21) below, screen casing (23) is positioned at oil pipe (22) below, plug (25) is positioned at screen casing (23) below, and packer (24) is positioned between screen casing (23) and plug (25).
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| CN201410058059.6A CN103835748A (en) | 2014-02-20 | 2014-02-20 | Method and device for surface well-drilling gas extraction |
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Cited By (3)
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| CN106884673A (en) * | 2017-02-25 | 2017-06-23 | 太原理工大学 | A kind of method that goaf coal bed gas pinpoints efficient extraction |
| CN110939407A (en) * | 2018-09-25 | 2020-03-31 | 山西省煤炭地质勘查研究院 | Double-deck overlapping goaf ground drainage well structure and recovery unit |
| CN114293926A (en) * | 2022-01-12 | 2022-04-08 | 淮北工业建筑设计院有限责任公司 | Anti-breaking well protection pipe |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106884673A (en) * | 2017-02-25 | 2017-06-23 | 太原理工大学 | A kind of method that goaf coal bed gas pinpoints efficient extraction |
| CN106884673B (en) * | 2017-02-25 | 2019-11-12 | 太原理工大学 | A kind of method that goaf coal bed gas pinpoints efficient extraction |
| CN110939407A (en) * | 2018-09-25 | 2020-03-31 | 山西省煤炭地质勘查研究院 | Double-deck overlapping goaf ground drainage well structure and recovery unit |
| CN114293926A (en) * | 2022-01-12 | 2022-04-08 | 淮北工业建筑设计院有限责任公司 | Anti-breaking well protection pipe |
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Address after: Lin Cheng Xi Lu Lake District 550081 Guizhou city of Guiyang province No. 95 seven floor Applicant after: Guizhou Pan Jiang cbm development utilizes Co., Ltd Address before: 550081 Guizhou Province, Guiyang City Lake District century Jin Yuan shopping center business building D block 15 layer Applicant before: Guizhou Pan Jiang cbm development utilizes Co., Ltd |
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Application publication date: 20140604 |