CN204627657U - Coal mine gas ground extraction casing programme - Google Patents
Coal mine gas ground extraction casing programme Download PDFInfo
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- CN204627657U CN204627657U CN201420752401.8U CN201420752401U CN204627657U CN 204627657 U CN204627657 U CN 204627657U CN 201420752401 U CN201420752401 U CN 201420752401U CN 204627657 U CN204627657 U CN 204627657U
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- production casing
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- pit shaft
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Abstract
The utility model provides a kind of coal mine gas ground extraction casing programme, comprises pit shaft, and the bottom of described pit shaft is coal seam, and described coal seam is far from shaft bottom 50m; Calculate have caving zone and fissure zone height successively on the top in coal seam from top to bottom according to colliery mining height; The inwall of described pit shaft is provided with production casing, and the upper end of this production casing is concordant with well head, and lower end is positioned at the intersection of caving zone and fissure zone, and production casing is provided with some perforations, and described perforation is distributed in the altitude range at fissure zone place.The impact of fragment blocking well of the application by avoiding goaf immediate roof on fissure zone well-case perforating and collapsing produced; Coal seam section adopts bore hole to avoid because top board collapses the impact of non-homogeneous stress on pit shaft validity, and can not exist because of sleeve pipe and cause harmful effect to down-hole coal excavation.
Description
Technical field
The utility model relates to coal-mining technique field, particularly relates to a kind of coal mine gas ground extraction casing programme.
Background technology
The pre-extraction in current China's gas ground (coal-bed gas exploitation) adopts the casing programme of accompanying drawing 1 more.There are following two shortcomings in this casing programme: (1) enters to have wall casing under in well, and in process of coal mining, wall casing to cause in the use in exploiting field coal-winning machine and has a strong impact on; (2) after coal mining, during roof slump, can well be blocked, cause extraction pit shaft to scrap, this pit shaft cannot be re-used and carry out minery and goaf gas extraction.In the multiplex extraction pilot project of Huainan, the extraction of Huaibei Coal Mine ground gas and Jincheng, Shanxi one well, adopt the casing programme of accompanying drawing 2, there are following two shortcomings in this casing programme: (1) this casing programme can be mined to coal-winning machine equally and be affected.(2) when coal seam immediate roof slump, pit shaft can be scrapped because of the squeeze and destroy of the blocking of slump thing or slump thing, also may because of the uneven impact force and extruding force and scrapping that produce of collapsing of always pushing up.
According to relevant calculation, when mining height is 2.5m, adopt above casing programme, ensure that overlying strata moving process middle sleeve is not destroyed, the diameter of institute's construction well is greater than 595mm, and drilling cost not only can be caused sharply to increase like this, and adopt this casing programme also cannot implement fracturing reform to coal seam.
Utility model content
The purpose of this utility model is the defect solving the existence of above-mentioned prior art, one is provided can effectively to solve in coal mine gas ground extraction process, adopt extraction and goaf extraction after mining in pre-extraction before utilizing same well to realize seam mining, recovery process, realize control of coalmine gas region protrusion-dispelling and the multiplex coal mine gas ground extraction casing programme of local protrusion-dispelling one well.
A kind of coal mine gas ground extraction casing programme, comprise pit shaft, the bottom of described pit shaft is coal seam, and described bottom is apart from shaft bottom 50m; Estimate have caving zone and fissure zone successively according to colliery mining height from top to bottom on the top in coal seam; The inwall of described pit shaft is provided with production casing, and the upper end of this production casing is concordant with well head, and lower end is at the intersection of caving zone and fissure zone, and production casing is provided with some perforations, and described perforation is distributed in the altitude range at fissure zone place.
Further, coal mine gas ground extraction casing programme as above, is provided with surface pipe on the top of production casing, and the diameter of surface pipe is greater than the diameter of production casing, and the upper end of surface pipe is concordant with well head, and lower end is arranged in stable basement rock.
Further, coal mine gas ground extraction casing programme as above, entering the basement rock degree of depth under the lower end of described production casing is 15-25 rice.
Further, coal mine gas ground extraction casing programme as above, the hole diameter at described surface pipe place is 311.5mm, and the diameter of surface pipe is 244.5mm.
Further, coal mine gas ground extraction casing programme as above, the hole diameter at described production casing place is 215.9mm, and the diameter of production casing is 139.7mm or 177.8mm.
The utility model efficiently solves in process of coal mining by caving zone end face to shaft bottom well section bore hole and after coal mining, when coal bed gas well can effectively avoid top board to collapse, uneven impact force is to the destruction of wall casing; By avoiding the impact of the fragment blocking well that collapses to fissure zone well-case perforating; Coal seam section bore hole can not have any impact to down-hole coal excavation; And well expense can not be increased considerably into, and the application life of well can be extended.Meanwhile, because production casing in well is only lower to roof caving zone end face, expense is also saved.
Accompanying drawing explanation
Fig. 1 is prior art gas ground pre-extraction well body structure schematic diagram;
Fig. 2 is prior art one well multiplex extraction well body structure schematic diagram;
Fig. 3 is the utility model coal mine gas ground extraction casing programme schematic diagram.
Reference numeral:
1-coal seam, 2-perforation, 3-production casing, 4-surface pipe, 5-fissure zone, 6-caving zone.
Detailed description of the invention
For making the purpose of this utility model, technical scheme and advantage clearly, below technical scheme in the utility model be clearly and completely described, obviously, described embodiment is the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Fig. 3 is the utility model coal mine gas ground extraction casing programme schematic diagram, and as shown in Figure 3, the coal mine gas ground extraction casing programme that the utility model provides, comprises pit shaft, and the bottom of described pit shaft is coal seam 1, and described coal seam 1 is apart from shaft bottom 50m; Estimate have caving zone 6 and fissure zone 5 successively according to colliery mining height from top to bottom on the top in coal seam 1; The inwall of described pit shaft is provided with production casing 3, the upper end of this production casing 3 is concordant with well head, lower end is at the intersection of caving zone 6 with fissure zone 5, and production casing 3 is provided with some perforations 2, and described perforation 2 is distributed in the altitude range at fissure zone 5 place.
Coal seam 1 is can the thing that drops in storage shaft running apart from the object that shaft bottom is set to 50m by the utility model, and reduce well workover number of times, that improves well utilizes the time.
The coal mine gas ground extraction casing programme that the utility model provides, before seam mining, utilizes bottom open hole well body structure (i.e. the part of caving zone less than 6), can implement the storey increase design in coal seam or not transform and direct mash gas extraction; In seam mining process, the gas of the direct extraction coal-face of this pit shaft can be utilized; Top board slump after mining, forms goaf, caving zone, fissure zone from bottom to top, by well-case perforating, pit shaft is communicated with fissure zone, caving zone and goaf, thus realizes goaf gas ground extraction.The depth of setting of the utility model production casing 3, can ensure coal seam adopt empty after pit shaft is unlikely scraps; Bottom caving zone to shaft bottom barefoot completion, upper sleeve completion, and at fissure zone 5 perforation, pit shaft still can be made after roof slump to be communicated with goaf; Before one well can realize adopting, adopt in adopt rear mash gas extraction.
The construction method of the utility model coal mine gas ground extraction casing programme is: described caving zone 6 calculates by the following method with the height of fissure zone 5: calculate caving zone height H m (Hm=3D ~ 5D) according to working seam lift height D; Fissure zone height H l (Hl=6D ~ 8D), then determines the depth of setting H (H=finishing drilling well depth-Hm-D-50) of production casing 3 according to caving zone 6 and the height of fissure zone 5.Back-up sand is to the caving zone end face calculated, setting of casing, well cementation.Back-up sand well cementation is to keep caving zone to be bore hole, can realize like this implementing aerodynamic force transformation to coal seam, and then improve the efficiency of pre-extraction, can not affect the work of coal-cutting machinery when seam mining, the rock crack formed after seam mining roof collapse in addition ensure that the connectedness of caving zone and pit shaft simultaneously.Aerodynamic force transformation is carried out to coal seam, after transformation reaches expection requirement, in well, injects water, suppress gas in well naturally to spray, then adopt perforating gun to carry out perforation to crack band, make fissure zone sleeve pipe form mesh.This step is under safety condition, make fissure zone sleeve pipe form mesh, is communicated with, realizes colliery minery and goaf gas extraction in seam mining process with the crack formed after seam mining with perforating wellbores mesh.
Further, coal mine gas ground extraction casing programme as above, the top of production casing 3 is provided with surface pipe 4, the diameter of surface pipe 4 is greater than the diameter of production casing 3, the upper end of surface pipe 4 is concordant with well head, lower end is arranged in stable basement rock, and entering the basement rock degree of depth under general lower end is 15-25 rice.
Described surface pipe 4 effect avoids caving ground to cause harmful effect to drilling well.
Further, coal mine gas ground extraction casing programme as above, the hole diameter at described surface pipe 4 place is 311.5mm, and the diameter of surface pipe 4 is 244.5mm., the hole diameter at described production casing 3 place is 215.9mm, and the diameter of production casing 3 is 139.7mm or 177.8mm.Its objective is that specification adopts consistent with petroleum system, be convenient to purchase and the quality control of sleeve pipe.
Last it is noted that above embodiment is only in order to illustrate the technical solution of the utility model, be not intended to limit; Although be described in detail the utility model with reference to previous embodiment, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of each embodiment technical scheme of the utility model.
Claims (5)
1. a coal mine gas ground extraction casing programme, is characterized in that, comprises pit shaft, and the bottom of described pit shaft is coal seam (1), and described coal seam (1) bottom is apart from shaft bottom 50m; Estimate have caving zone (6) and fissure zone (5) successively according to colliery mining height from top to bottom on the top of coal seam (1); The inwall of described pit shaft is provided with production casing (3), the upper end of this production casing (3) is concordant with well head, lower end is at the intersection of caving zone (6) with fissure zone (5), production casing (3) is provided with some perforations (2), and described perforation (2) is distributed in the altitude range at fissure zone (5) place.
2. coal mine gas ground extraction casing programme according to claim 1, it is characterized in that, the top of production casing (3) is provided with surface pipe (4), the diameter of surface pipe (4) is greater than the diameter of production casing (3), the upper end of surface pipe (4) is concordant with well head, and lower end is arranged in stable basement rock.
3. coal mine gas ground extraction casing programme according to claim 2, is characterized in that, entering the basement rock degree of depth under the lower end of described production casing (3) is 15-25 rice.
4. coal mine gas ground extraction casing programme according to claim 2, is characterized in that, the hole diameter at described surface pipe (4) place is 311.5mm, and the diameter of surface pipe (4) is 244.5mm.
5. coal mine gas ground extraction casing programme according to claim 2, is characterized in that, the hole diameter at described production casing (3) place is 215.9mm, and the diameter of production casing (3) is 139.7mm or 177.8mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420752401.8U CN204627657U (en) | 2014-12-01 | 2014-12-01 | Coal mine gas ground extraction casing programme |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420752401.8U CN204627657U (en) | 2014-12-01 | 2014-12-01 | Coal mine gas ground extraction casing programme |
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| Publication Number | Publication Date |
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| CN204627657U true CN204627657U (en) | 2015-09-09 |
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| CN201420752401.8U Expired - Fee Related CN204627657U (en) | 2014-12-01 | 2014-12-01 | Coal mine gas ground extraction casing programme |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107620581A (en) * | 2017-07-31 | 2018-01-23 | 山西晋城无烟煤矿业集团有限责任公司 | The construction method of the dual-purpose mine shaft inspection hole of one well |
| CN108331560A (en) * | 2018-01-29 | 2018-07-27 | 中煤科工集团重庆研究院有限公司 | A kind of coal bed gas surface well pumping method of minery containing water flooding |
| CN109519149A (en) * | 2018-09-28 | 2019-03-26 | 山西晋城无烟煤矿业集团有限责任公司 | A kind of coal bed gas passes through the full well cementing method of goaf well |
| 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 |
| CN112879078A (en) * | 2021-01-28 | 2021-06-01 | 中煤科工集团重庆研究院有限公司 | Method for pre-pumping original coal seam and extracting gas from ground well of goaf |
-
2014
- 2014-12-01 CN CN201420752401.8U patent/CN204627657U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107620581A (en) * | 2017-07-31 | 2018-01-23 | 山西晋城无烟煤矿业集团有限责任公司 | The construction method of the dual-purpose mine shaft inspection hole of one well |
| CN108331560A (en) * | 2018-01-29 | 2018-07-27 | 中煤科工集团重庆研究院有限公司 | A kind of coal bed gas surface well pumping method of minery containing water flooding |
| 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 |
| CN109519149A (en) * | 2018-09-28 | 2019-03-26 | 山西晋城无烟煤矿业集团有限责任公司 | A kind of coal bed gas passes through the full well cementing method of goaf well |
| CN112879078A (en) * | 2021-01-28 | 2021-06-01 | 中煤科工集团重庆研究院有限公司 | Method for pre-pumping original coal seam and extracting gas from ground well of goaf |
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| Date | Code | Title | Description |
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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: 20150909 Termination date: 20151201 |
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| EXPY | Termination of patent right or utility model |