CN201924897U - Well bore structure of pressure-relief coal bed methane ground extraction well - Google Patents
Well bore structure of pressure-relief coal bed methane ground extraction well Download PDFInfo
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- CN201924897U CN201924897U CN2011200381170U CN201120038117U CN201924897U CN 201924897 U CN201924897 U CN 201924897U CN 2011200381170 U CN2011200381170 U CN 2011200381170U CN 201120038117 U CN201120038117 U CN 201120038117U CN 201924897 U CN201924897 U CN 201924897U
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- 238000000605 extraction Methods 0.000 title claims abstract description 22
- 239000003245 coal Substances 0.000 title abstract description 11
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title abstract 6
- 238000005553 drilling Methods 0.000 claims abstract description 5
- 230000005540 biological transmission Effects 0.000 claims description 15
- 238000005065 mining Methods 0.000 abstract description 7
- 238000010276 construction Methods 0.000 abstract description 3
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 239000003208 petroleum Substances 0.000 description 9
- 239000011435 rock Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
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Abstract
A well bore structure of a pressure-relief coal bed methane ground extraction well comprises a first hole diameter section of a first vertical depth of a borehole angle-building drilled hole, a second hole diameter section of a second vertical depth, a second hole diameter section of a third vertical depth of a vertical drilled hole and a third hole diameter section deeply entering a protected layer. The well bore structure is characterized in that holes are drilled outside a working area, directional angle building is realized on each of upper portions of the first hole diameter section and the second hole diameter section, the lower portion of the second hole diameter section and the third hole diameter section are straight well bores, and hole drilling is finished within the working area and close to the border of the working area. Accordingly, most of the well bore structures are arranged outside a mining affecting range or in an area with lower mining influence, stability of the ground extraction well is greatly improved, construction risks are reduced, extraction yield of the coal bed methane well is increased, damage of movement of mining overlaying strata to the ground well is effectively decreased, and service time of the ground extraction well is prolonged.
Description
Technical field
The utility model relates to a kind of casing programme, especially a kind of casing programme that is applicable to the pressure released seam gas ground extraction well of colliery minery.
Background technology
Colliery minery pressure released seam gas ground extraction well adopts the technology mode of " the ground straight well is distributed in the upper and lower air way center line in exploiting field " or " the ground straight well is distributed in the exploiting field near last return airway " more.The pressure released seam gas surface well of early stage design; position of opening and whole hole site all are positioned at the exploiting field and move towards on the center line; layer position, whole hole topping base plate; protection casing is down to basement rock; the gas transmission sleeve pipe pushes up down to the protected seam coal seam; the gas transmission sleeve pipe is with down to topping top board underlying work screen casing, and topping coal top board to base plate cement paste seals.The key issue that exists is that the disrumpent feelings rate of surface well wellhole is higher, surface well weak point service time.The reason that the disrumpent feelings rate of wellhole is high be when the topping coal seam thicker; when the exploitation settling rate is big; topping is adopted the overlying rock that causes and is moved acutely; size that rock moves and rate variation have been controlled the wellhole degree of being damaged; near the degree of being damaged the center line of exploiting field in the plane is big, and is big near the position of the mined bed degree of being damaged on layer territory.
Summary of the invention
The technical problems to be solved in the utility model: the purpose of this utility model overcomes the deficiency in the prior art, provide a kind of simple in structure, well bore stable, can effectively reduce mining overburden and move the casing programme that destroys surface well and increase the pressure released seam gas ground extraction well of ground extraction well service time.
Technical scheme: the casing programme of pressure released seam gas ground extraction well of the present utility model, comprise first perforate footpath section, second vertical depth of first vertical depth of deflecting the boring boring second perforate footpath section, vertical drilling the 3rd vertical depth second perforate footpath section and go deep into the 3rd perforate footpath section in the protected seam, the aperture of second perforate footpath section is less than the aperture of first perforate footpath section, and the 3rd perforate footpath section is less than second perforate footpath section; Be provided with protection casing in first perforate footpath section, be provided with in the protection casing deeply to second vertical depth bottom the gas transmission sleeve pipe, the gas transmission sleeve bottom has the air inlet screen casing until the 3rd vertical depth bottom.
The maximum hole angle of described deflecting the boring boring is 15～25 °, and hole curvature should be 5～10 °/100m; The centre bore of centre bore to the three perforates footpath section of described first perforate footpath section apart from 30-40m; Described air inlet screen casing comprises first screen casing, second screen casing that connects successively and the 3rd screen casing that is connected with the gas transmission sleeve bottom.
Beneficial effect: adopt the well bore design of three opening structures, at perforate footpath section and section top, two perforates footpath directional inclination, two perforates footpath pars infrasegmentalis and three perforates footpath section adopt straight well, and three super hole cutters are to the topping base plate more than the 10m.Position of opening is positioned at outside the exploiting field in the 10m of section boundary, and whole hole well location places in the exploiting field apart from section boundary 30m place; Owing to place the well bore major part outside the mining influence district or the less place of mining influence, adopted the wellbore trajectory design of first deflecting boring, back vertical drilling, thereby reduced the destroyed probability of well bore; Because three perforates footpath section is drilled under the protected seam base plate more than the 10m; can prevent that the tiny coal petrography piece that enters screen casing from stopping up screen casing; reduce construction risk, strengthened extraction well casing programme stability; compared with prior art; well bore mechanism can make surface well extraction time lengthening; extraction coal bed gas aggregated capacity improves greatly, can effectively reduce mining overburden and move the service time of destroying surface well and increasing the ground extraction well.It is simple in structure, and the stability of ground extraction well is high, and construction risk is low, and coal bed gas well extraction production capacity height has practicality widely.
Description of drawings
Fig. 1 is a casing programme schematic diagram of the present utility model.
Among the figure: 1-first perforate footpath, 2-protection casing, 3-bedrock surface, 4-gas transmission sleeve pipe; 5-second perforate footpath, 6-first screen casing, 7-second screen casing, 8-expanded rubber; 9-the 3rd screen casing, 10-the 3rd perforate footpath, the 11-protected coal seam, 12-protects the coal seam.
The specific embodiment
Below in conjunction with accompanying drawing an embodiment of the present utility model is further described:
Shown in Figure 1; the casing programme of pressure released seam gas ground extraction well; second perforate footpath section 5 of second perforate footpath section 5 of first perforate footpath section 1, the second vertical depth H2 of the first vertical depth H1 of deflecting the boring boring, the 3rd vertical depth H3 of vertical drilling and go deep into the 3rd perforate footpath section 10 in the protected seam 12; the maximum oblique angle of the deflecting the boring boring of the first vertical depth H1 and the second vertical depth H2 is 15～25 °, and hole curvature should be 5～10 °/100m.The aperture of second perforate footpath section 5 is less than the aperture of first perforate footpath section 1, and the 3rd perforate footpath section 10 is less than second perforate footpath section 5; The distance of the centre bore of centre bore to the three perforates footpath section 10 of first perforate footpath section 1 is 30～40m.Be provided with protection casing 2 in first perforate footpath section 1, be provided with in the protection casing 2 deeply to second vertical depth H2 bottom gas transmission sleeve pipe 4, gas transmission sleeve pipe 4 has the air inlet screen casing until the 3rd vertical depth H3 bottom, the air inlet screen casing is made of first screen casing 9, second screen casing 7 that connect successively and the 3rd screen casing 6 that is connected with gas transmission sleeve pipe 4 bottoms, second screen casing, 7 external first screen casings, 9 tops, be connected to gas transmission sleeve pipe 4 bottoms in the 3rd screen casing 6, the 3rd screen casing 6 is sleeved in second screen casing 7.First perforate footpath 1 is about 350mm, and second perforate footpath 5 is about 216mm, and the 3rd perforate footpath 10 is about 152mm; The 1 section need in first perforate footpath are drilled into bedrock surface 3 following 30m, and the 5 sections need in second perforate footpath are drilled into the above 10m of topping 12 top boards, and the 3rd perforate directly 10 sections need is drilled under topping 12 base plates about 10m.First perforate footpath section protection casing 2 adopts Φ 244.5mm caliber * 11.05mm wall thickness petroleum casing pipe; 5 sections gas transmission sleeve pipes in second perforate footpath 4 adopt the petroleum casing pipe of Φ 177.8mm caliber * 9.19mm wall thickness; First screen casing 6 adopts the petroleum casing pipe of Φ 168mm caliber * 7.32mm wall thickness, is connected to gas transmission sleeve pipe 4 bottoms on first screen casing 6; Second screen casing 7 adopts the petroleum casing pipe of Φ 194mm caliber * 9.52mm wall thickness; The 3rd screen casing 9 adopts Φ 177.8mm caliber * 9.18mm petroleum casing pipe; 9 sections tops of second screen casing 7 and the 3rd screen casing are connected.First screen casing, 6, the second screen casings 7 and the 3rd screen casing 9 raw material selection petroleum casing pipes, drill diameter is that the circular port of 18mm is a mesh on petroleum casing pipe, bores 5 meshes around one week of petroleum casing pipe, bores about 100 circular meshes in the 1m petroleum casing pipe.
Claims (4)
1. the casing programme of a pressure released seam gas ground extraction well, it is characterized in that: it comprise first perforate footpath section (1), second vertical depth (H2) of first vertical depth (H1) of deflecting the boring boring second perforate footpath section (5), vertical drilling the 3rd vertical depth (H3) second perforate footpath section (5) and go deep into the 3rd perforate footpath section (10) in the protected seam (12), the aperture of second perforate footpath section (5) is less than the aperture of first perforate footpath section (1), and the 3rd perforate footpath section (10) is less than second perforate footpath section (5); Be provided with protection casing (2) in first perforate footpath section (1), be provided with in the protection casing (2) deeply to second vertical depth (H2) bottom gas transmission sleeve pipe (4), gas transmission sleeve pipe (4) has the air inlet screen casing until the 3rd vertical depth (H3) bottom.
2. the casing programme of pressure released seam gas ground extraction well according to claim 1 is characterized in that: the maximum hole angle of described deflecting the boring boring is 15～25 °, and hole curvature should be 5～10 °/100m.
3. the casing programme of pressure released seam gas ground extraction well according to claim 1 is characterized in that: the distance of the centre bore of centre bore to the three perforates footpath sections (10) of described first perforate footpath section (1) is 30～40m.
4. the casing programme of pressure released seam gas ground extraction well according to claim 1 is characterized in that: described air inlet screen casing comprises successively first screen casing (9) that connects, second screen casing (7), and the 3rd screen casing (6) that is connected bottom gas transmission sleeve pipe (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200381170U CN201924897U (en) | 2011-02-14 | 2011-02-14 | Well bore structure of pressure-relief coal bed methane ground extraction well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200381170U CN201924897U (en) | 2011-02-14 | 2011-02-14 | Well bore structure of pressure-relief coal bed methane ground extraction well |
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| Publication Number | Publication Date |
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| CN201924897U true CN201924897U (en) | 2011-08-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200381170U Expired - Fee Related CN201924897U (en) | 2011-02-14 | 2011-02-14 | Well bore structure of pressure-relief coal bed methane ground extraction well |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102121364A (en) * | 2011-02-14 | 2011-07-13 | 中国矿业大学 | Well structure of pressure-releasing coal bed gas ground extraction well and arrangement method thereof |
| CN102619476A (en) * | 2012-04-10 | 2012-08-01 | 中国矿业大学 | Pipe body structure of step type hole protecting pipe for gas extraction hole in soft coal bed |
| CN103061796A (en) * | 2011-10-19 | 2013-04-24 | 淮南矿业(集团)有限责任公司 | Extraction pipe, extraction system and downwards-drilling extraction method |
| CN103147716A (en) * | 2013-03-08 | 2013-06-12 | 中煤科工集团重庆研究院 | Partial cementing method for coal bed gas ground well in mining area |
| CN104481579A (en) * | 2014-12-16 | 2015-04-01 | 中煤科工集团重庆研究院有限公司 | Construction method for ground L-shaped roof horizontal well in mining area |
| CN106761406A (en) * | 2016-12-02 | 2017-05-31 | 淮北矿业（集团）有限责任公司 | A kind of ground L-type mash gas pumping drilling |
| CN107806328A (en) * | 2017-10-24 | 2018-03-16 | 中国矿业大学 | A kind of ground gas extraction drilled well bore structure provided with flexible production sleeve pipe |
-
2011
- 2011-02-14 CN CN2011200381170U patent/CN201924897U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102121364A (en) * | 2011-02-14 | 2011-07-13 | 中国矿业大学 | Well structure of pressure-releasing coal bed gas ground extraction well and arrangement method thereof |
| CN103061796A (en) * | 2011-10-19 | 2013-04-24 | 淮南矿业(集团)有限责任公司 | Extraction pipe, extraction system and downwards-drilling extraction method |
| CN103061796B (en) * | 2011-10-19 | 2016-02-03 | 淮南矿业(集团)有限责任公司 | Drainage tube, extraction system and lower to hole pumping and mining method |
| CN102619476A (en) * | 2012-04-10 | 2012-08-01 | 中国矿业大学 | Pipe body structure of step type hole protecting pipe for gas extraction hole in soft coal bed |
| CN102619476B (en) * | 2012-04-10 | 2014-03-26 | 中国矿业大学 | Pipe body structure of step type hole protecting pipe for gas extraction hole in soft coal bed |
| CN103147716A (en) * | 2013-03-08 | 2013-06-12 | 中煤科工集团重庆研究院 | Partial cementing method for coal bed gas ground well in mining area |
| CN103147716B (en) * | 2013-03-08 | 2016-06-22 | 中煤科工集团重庆研究院有限公司 | Minery coal bed gas surface well local cementing method |
| CN104481579A (en) * | 2014-12-16 | 2015-04-01 | 中煤科工集团重庆研究院有限公司 | Construction method for ground L-shaped roof horizontal well in mining area |
| CN106761406A (en) * | 2016-12-02 | 2017-05-31 | 淮北矿业（集团）有限责任公司 | A kind of ground L-type mash gas pumping drilling |
| CN107806328A (en) * | 2017-10-24 | 2018-03-16 | 中国矿业大学 | A kind of ground gas extraction drilled well bore structure provided with flexible production sleeve pipe |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110810 Termination date: 20150214 |
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| EXPY | Termination of patent right or utility model |