CN214616474U - Well body structure with multiple goafs penetrated by one well - Google Patents
Well body structure with multiple goafs penetrated by one well Download PDFInfo
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- CN214616474U CN214616474U CN202120619288.6U CN202120619288U CN214616474U CN 214616474 U CN214616474 U CN 214616474U CN 202120619288 U CN202120619288 U CN 202120619288U CN 214616474 U CN214616474 U CN 214616474U
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Abstract
The utility model relates to a coal seam gas takes out and adopts technical field, specifically is a well body structure of many collecting space areas is worn to a well. The problem of in the goaf coal bed gas ground extraction, a goaf well is played in every goaf, lead to goaf ground well head to arrange more, take up an area of more to cause the extraction cost to increase is solved. The well body structure with the multiple goafs penetrated by the well comprises a first drilled hole, a second drilled hole and a third drilled hole, wherein the calibers of the first drilled hole, the second drilled hole and the third drilled hole are sequentially reduced; firstly, drilling a drill hole to 20m below bedrock, putting a surface sleeve to the bottom of the hole, and cementing the well by adopting cement; drilling a second drilled hole from the bottom of the first drilled hole to a position above a goaf fracture zone, putting a production sleeve to the bottom of the second drilled hole, and cementing by using cement; and the three-cut drilling hole enters the upper fracture zone of the gob from a horizontal well arranged at the bottom of the two-cut drilling hole, the horizontal well penetrates through at least two fractures of the gob, and the sieve tube is arranged to the bottom of the horizontal well.
Description
Technical Field
The utility model relates to a coal seam gas takes out and adopts technical field, specifically is a well body structure of many collecting space areas is worn to a well.
Background
With the continuous development of the extraction of the coal bed gas ground of the goaf, in the extraction of the coal bed gas ground of the goaf, each goaf is provided with a goaf well, the goafs of a plurality of mines are adjacent and very close, if each goaf well is provided with a well, the waste of the ground space of the goaf is caused, and the goaf wells under the ground are possibly staggered with each other to cause mutual interference. In addition, in the prior art, ground waste is caused under the condition that the underground goaf is flooded by water and does not produce gas.
Disclosure of Invention
The utility model discloses a solve the collecting space area coal bed gas ground and take out and adopt, every collecting space area is played a collecting space area well, leads to collecting space area ground well head to arrange more, and it is more to take up an area of land to cause the problem of taking out and adopt the cost increase, provide a well bore structure that many collecting space areas were worn to a well.
The utility model discloses an adopt following technical scheme to realize: the well body structure with the multiple goafs penetrated by the well comprises a first drilled hole, a second drilled hole and a third drilled hole, wherein the calibers of the first drilled hole, the second drilled hole and the third drilled hole are sequentially reduced; firstly, drilling a drill hole to 20m below bedrock, putting a surface sleeve to the bottom of the hole, and cementing the well by adopting cement; drilling a second drilled hole from the bottom of the first drilled hole to a position above a goaf fracture zone, putting a production sleeve to the bottom of the second drilled hole, and cementing by using cement; and the three-cut drilling hole enters the upper fissure zone of the goaf from a horizontal well arranged at the bottom of the two-cut drilling hole, the horizontal well penetrates through the upper fissure zones of at least two goafs, and the screen pipe is arranged to the bottom of the horizontal well.
The wellhead is connected with corresponding extraction equipment, so that coal bed gas of at least two goafs can be extracted from one well, the application of ground equipment can be saved, the production efficiency is improved, and the production cost is reduced.
The surface stratum is stabilized by drilling to 20m below the bedrock and setting the surface casing. And secondly, drilling to a position above a fracture zone of the goaf, and putting into a production casing for well cementation so as to plug a water-bearing layer above the fracture zone.
Furthermore, the horizontal well is drilled in a sandstone stratum fracture zone above the top plate mudstone of the goaf, and the distance between the horizontal well and the top plate is 1-2 times of the thickness of the coal bed of the goaf. Three openings are drilled to the top plate sandstone close to the gob along the horizontal section, and the screen pipes are arranged to communicate the gob fracture zone with the sandstone reservoir, so that the gas production efficiency is maximized.
Furthermore, the horizontal well penetrates through the two goaf cracks, and the horizontal well is drilled to the middle part close to the second goaf, so that the maximum crack at the collapse top of the goaf can be effectively connected.
The utility model has the advantages that:
the utility model discloses a shaft structure can effectively improve the coal bed gas extraction rate of collecting space area coal bed gas well, and the coal bed gas in two collecting space areas can be extracted to a well.
The well body structure of the utility model can obviously reduce the production cost (including the cost of underground and ground equipment).
Drawings
Figure 1 a schematic view of a shaft structure of a well penetrating multiple goafs.
1-first drilled hole, 2-surface sleeve, 3-second drilled hole, 4-production sleeve, 5-third drilled hole, 6-sieve tube, 7-sandstone layer, 8-shale layer, 9-coal layer, 10-goaf and 11-fissure zone.
Detailed Description
For making the utility model discloses the technological means, creation characteristic, achievement purpose and efficiency that realize are easily understood and are known, combine specific implementation below, further explain the utility model discloses:
the well body structure with one well penetrating multiple goafs comprises a first drilled hole 1, a surface sleeve 2, a second drilled hole 3, a production sleeve 4, a third drilled hole 5, a horizontal well, well cement and a sieve tube 6.
In conjunction with FIG. 1: a well bores well bore structure in many collecting space areas, creeps into the step and does:
1. drilling at once
Firstly, a 444mm drill bit is used for drilling to 20m below bedrock, a 377mm surface sleeve is put to the bottom of a hole, cement is adopted for well cementation, and the cement is well cemented to the ground.
2. Two-hole drilling
And in the second-opening process, a 311mm drill bit is used for drilling to a position above an upper fracture zone of the goaf, a 244.5mm production sleeve is put into the bottom of the second-opening well, and the well cementation cement is raised to the ground.
3. Three-opening structure
And three openings are formed by drilling a horizontal well by adopting a 215.9mm drill bit, entering the upper fracture zone of the goaf, penetrating through two goaf fractures (the fracture zones above the two goafs marked with 10 in the figure), and then, descending a 139.7mm sieve tube to the bottom of the well to complete the well.
Furthermore, the horizontal section is drilled in a sandstone stratum fracture zone above the top plate mudstone of the goaf, and the distance between the horizontal section and the top plate is 1-2 times of the thickness of the coal bed of the goaf.
Further, the horizontal section is drilled to the middle part near the second goaf (the middle position above the right goaf in the figure).
Furthermore, the first open-top sleeve adopts a J55 type steel sleeve, and the second open-top sleeve and the three-open screen pipe adopt an N80 type steel sleeve.
The working principle is as follows: the surface stratum is stabilized by drilling to 20m below the bedrock and setting the surface casing. And secondly, drilling to a position above a fracture zone of the goaf, and putting into a production casing for well cementation so as to plug a water-bearing layer above the fracture zone. Three openings are drilled to the top plate sandstone close to the gob along the horizontal section, and the screen pipes are arranged to communicate the gob fracture zone with the sandstone reservoir, so that the gas production efficiency is maximized.
The present embodiment is not intended to limit the shape, material, structure, etc. of the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention are all within the protection scope of the technical solution of the present invention.
Claims (7)
1. The well body structure with the multiple goafs penetrated by the well is characterized by comprising a first drilled hole (1), a second drilled hole (3) and a third drilled hole (5), wherein the calibers of the first drilled hole, the second drilled hole and the third drilled hole are sequentially reduced; drilling a drilling hole (1) to 20m below bedrock, putting a surface sleeve (2) to the bottom of the hole, and cementing the hole by using cement; drilling a second drilled hole (3) from the bottom of the first drilled hole (1) to a position above an upper fracture zone of the goaf, and putting a production sleeve (4) to the bottom of the second drilled hole (3) for cementing by using cement; and the three-cut drill hole (5) enters the upper fissure zone of the goaf from a horizontal well formed at the bottom of the two-cut drill hole (3), the horizontal well penetrates through the upper fissure zones of at least two goafs, and the sieve tube (6) is arranged to the bottom of the horizontal well.
2. The well bore structure of one well penetrating multiple goaf according to claim 1, characterized in that a drill hole (1) is drilled using a 444mm drill bit, a 377mm watch sleeve (2) is run to the bottom of the hole, and cement is cemented to the surface.
3. The well bore structure of multiple goafs is penetrated through one well according to claim 1, characterized in that the second drilled hole (3) is drilled by a 311mm drill bit, a 244.5mm production sleeve (4) is put into the bottom of the second drilled hole, and the well cementation cement is raised to the ground.
4. The shaft structure of a well penetrating multiple goafs of claim 1, characterized in that the three drilled holes (5) are horizontal holes drilled with 215.9mm drill bits and a 139.7mm screen (6) is run into the bottom of the well.
5. The well bore structure of one well penetrating multiple goafs as claimed in any one of claims 1-4, wherein the horizontal well is drilled into a sandstone stratum fissure zone above a top plate mudstone of the goaf, and the distance from the top plate after drilling is 1-2 times of the thickness of a coal bed of the goaf.
6. The well bore structure of one well through multiple goafs of any one of claims 1-4, wherein a horizontal well penetrates two goaf fracture zones; the front end of the horizontal well is drilled to the middle part close to the second goaf.
7. A well-through multi-gob wellbore construction as set forth in any of claims 1-4 wherein the casing (2) is made of J55 type steel casing and the casing (4) and screen (6) are made of N80 type steel casing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120619288.6U CN214616474U (en) | 2021-03-26 | 2021-03-26 | Well body structure with multiple goafs penetrated by one well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120619288.6U CN214616474U (en) | 2021-03-26 | 2021-03-26 | Well body structure with multiple goafs penetrated by one well |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214616474U true CN214616474U (en) | 2021-11-05 |
Family
ID=78397152
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120619288.6U Expired - Fee Related CN214616474U (en) | 2021-03-26 | 2021-03-26 | Well body structure with multiple goafs penetrated by one well |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214616474U (en) |
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2021
- 2021-03-26 CN CN202120619288.6U patent/CN214616474U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20211105 |