CN207048742U - A kind of drilled well bore structure for weakening coal seam tight roof - Google Patents
A kind of drilled well bore structure for weakening coal seam tight roof Download PDFInfo
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- CN207048742U CN207048742U CN201720950161.6U CN201720950161U CN207048742U CN 207048742 U CN207048742 U CN 207048742U CN 201720950161 U CN201720950161 U CN 201720950161U CN 207048742 U CN207048742 U CN 207048742U
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Abstract
The utility model belongs to control of coalmine gas technical field, specifically a kind of drilled well bore structure for weakening coal seam tight roof.Solve horizontal segment well cementation easily pollution coal seam reservoirs, the problem of being unfavorable for gas well aerogenesis, including the perforate and two perforates set gradually from top to bottom, two perforate tail ends connect three horizontally arranged perforates, the drilling depth of one perforate is 10m below basement rock, surface pipe I and cementing concrete I is provided with the inside of one perforate, the drilling depth of two perforates is to purpose coal seam top 5m opening positions, surface pipe II and cementing concrete II is provided with the inside of two perforates, at the drilling depth of three perforates to purpose coal seam target position, surface pipe III is provided with the inside of three perforates, managed to be real on surface pipe III tops, surface pipe III bottoms are every 5 screen casings and the alternately connection setting of 1 real pipe.The utility model structure, in the case where ensureing not pollute coal seam, release effect, quick pumping and mining pressure relief area gas can be adopted using superjacent.
Description
Technical field
The utility model belongs to control of coalmine gas technical field, specifically a kind of drilling well well for weakening coal seam tight roof
Body structure.
Background technology
Early stage, the horizontal well of construction was taken out on ground in advance, the main tripping in production casing of horizontal segment, the later stage using sliding sleeve fracturing or
It is that hydraulic jet perforation connection makees pressure break etc., or horizontal segment using modes such as barefoot completions.The problem of existing be：Barefoot completion well
Wall easily caves in, and the gross area that cased hole completion later stage sliding sleeve fracturing or abrasive perforating pressure break eyelet contact with coal seam is smaller, the later stage
Part well blocks the situation for tolerance decline occur and needs to repeat well workover, while the easy pollution coal of horizontal segment well cementation during mining
Reservoir, it is unfavorable for gas well aerogenesis.Coal develops correlation technique with coal bed gas Gong Cai National Key Laboratories.
The content of the invention
The utility model is in order to solve horizontal segment well cementation easily pollution coal seam reservoirs, the problem of being unfavorable for gas well aerogenesis, there is provided
A kind of drilled well bore structure for weakening coal seam tight roof.
The utility model takes following technical scheme：A kind of drilled well bore structure for weakening coal seam tight roof, including by
The perforate and two perforates that top to bottm is set gradually, two perforate tail ends connect three horizontally arranged perforates, the brill of a perforate
Well depth is 10m below basement rock, is provided with surface pipe I and cementing concrete I on the inside of a perforate, the drilling depth of two perforates to purpose
Coal seam top 5m opening positions, are provided with surface pipe II and cementing concrete II on the inside of two perforates, the drilling depth of three perforates to purpose
At the target position of coal seam, surface pipe III is provided with the inside of three perforates, surface pipe III tops are managed to be real, under surface pipe III
Portion is every 5 screen casings and the alternately connection setting of 1 real pipe.
Cementing concrete thickness is 20-40cm in one perforate and two perforates.Surface pipe is higher by earth's surface 30cm.
Surface pipe I selection of casing grade of steel is J55 types, and surface pipe II selection of casing grade of steel is N80 types, surface pipe
III selection of casing grade of steel is N80 types.
Compared with prior art, the utility model has the advantages that：
1) horizontal segment（Three perforates）The surface pipe III of tripping in is that screen casing combines with real pipe, ensures horizontal segment wellbore stability.
2) combination of horizontal segment screen casing and real pipe is every 5 screen casings and 1 real pipe, has fully ensured that pit shaft and coal seam
Contact area.
3）The surface pipe III of horizontal segment uses the combination of screen casing and real pipe, while contact area is ensured, tripping in
Real pipe can ensure surface pipe III smoothness, smoothly by surface pipe III G.I.Hs.
4）The tripping in of surface pipe III landing point all of the above is managed in fact, can be ensured in the case where pit shaft has water, tripping in is taken out
Adopt equipment and carry out land drainage.
5）The utility model structure, in the case where ensureing not pollute coal seam, release work can be adopted using superjacent
With quick pumping and mining pressure relief area gas.
Brief description of the drawings
Fig. 1 is the utility model structure diagram.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out
Clearly and completely describing, it is clear that described embodiment is only the utility model part of the embodiment, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment obtained, belong to the scope of the utility model protection.
As shown in figure 1, a kind of drilled well bore structure for weakening coal seam tight roof, including one set gradually from top to bottom
The perforate 2 of perforate 1 and two, the tail end of two perforate 2 connect horizontally arranged three perforates 3, the drilling depth of a perforate 1 for basement rock with
Lower 10m, the inner side of a perforate 1 are provided with surface pipe I and cementing concrete I, the drilling depth of two perforates 2 to purpose coal seam top 5m positions
Put place, the inner side of two perforate 2 is provided with surface pipe II and cementing concrete II, the drilling depth of three perforates 3 to purpose coal seam target spot position
Place is put, the inner side of three perforate 3 is provided with surface pipe III, and surface pipe III tops are real pipe 4, and surface pipe III bottoms are every 5
Alternately connection is set for screen casing 5 and 1 real pipe 4.
Cementing concrete thickness is 20-40cm in one perforate 1 and two perforates 2.Surface pipe is higher by earth's surface 30cm.
Surface pipe I selection of casing grade of steel is J55 types, and surface pipe II selection of casing grade of steel is N80 types, surface pipe
III selection of casing grade of steel is N80 types.
1）The aperture of a described perforate is 0.311m, and drilling depth is 10m below basement rock, and tripping in surface pipe external diameter is
0.273m, selection of casing grade of steel are J55 types, and using cementing well, cement returns up to ground；
2）The aperture of two described perforates is 0.241m, drilling depth to purpose coal seam top 5m, outside tripping in protective casing
Footpath is 0.1937m, and selection of casing grade of steel is N80 types, and using cementing well, cement returns up to ground；
3）The aperture of three described perforates is 0.1715m, drilling depth to purpose coal seam target spot, tripping in surface pipe III
（Surface pipe III is screen casing and real pipe according to 5:The combination of the combination of 1 length, screen casing and real pipe is every 5 screen casings and 1
Root is managed in fact, and the combination repeats in horizontal segment, and the tripping in of landing point all of the above is managed in fact）External diameter is 0.1937m, from set
Pipe grade of steel is N80 types, is not cemented the well.
Although the utility model is described in detail with reference to the foregoing embodiments, come for those skilled in the art
Say, it can still be modified to the technical scheme described in foregoing embodiments, or which part technical characteristic is entered
Row equivalent substitution, all within the spirit and principles of the utility model, any modification, equivalent substitution and improvements made etc., all should
Within the scope of protection of the utility model.
Claims (4)
- A kind of 1. drilled well bore structure for weakening coal seam tight roof, it is characterised in that：Including set gradually from top to bottom one Perforate（1）With two perforates（2）, two perforates（2）Tail end connects three horizontally arranged perforates（3）, a perforate（1）Drilling well it is deep Spend for 10m below basement rock, a perforate（1）Inner side is provided with surface pipe I and cementing concrete I, two perforates（2）Drilling depth to mesh Coal seam top 5m opening positions, two perforates（2）Inner side is provided with surface pipe II and cementing concrete II, three perforates（3）Drilling well it is deep At degree to purpose coal seam target position, three perforates（3）Inner side is provided with surface pipe III, and surface pipe III tops are managed to be real（4）, Surface pipe III bottoms are every 5 screen casings（5）With 1 real pipe（4）Alternately connection is set.
- 2. the drilled well bore structure of reduction coal seam tight roof according to claim 1, it is characterised in that：One perforate（1） And two perforate（2）Interior cementing concrete thickness is 20-40cm.
- 3. the drilled well bore structure of reduction coal seam tight roof according to claim 2, it is characterised in that：Surface pipe is high Go out earth's surface 30cm.
- 4. the drilled well bore structure of reduction coal seam tight roof according to claim 3, it is characterised in that：Surface pipe I Selection of casing grade of steel is J55 types, and surface pipe II selection of casing grade of steel is N80 types, and surface pipe III selection of casing grade of steels are N80 types.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720950161.6U CN207048742U (en) | 2017-08-01 | 2017-08-01 | A kind of drilled well bore structure for weakening coal seam tight roof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720950161.6U CN207048742U (en) | 2017-08-01 | 2017-08-01 | A kind of drilled well bore structure for weakening coal seam tight roof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207048742U true CN207048742U (en) | 2018-02-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720950161.6U Active CN207048742U (en) | 2017-08-01 | 2017-08-01 | A kind of drilled well bore structure for weakening coal seam tight roof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112780248A (en) * | 2019-11-04 | 2021-05-11 | 中国石油天然气股份有限公司 | Coal bed gas horizontal well and construction method thereof |
| CN112963120A (en) * | 2021-01-27 | 2021-06-15 | 中国节能减排有限公司北京建筑光伏科技分公司 | Device and method for coal bed gas horizontal well completion |
-
2017
- 2017-08-01 CN CN201720950161.6U patent/CN207048742U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112780248A (en) * | 2019-11-04 | 2021-05-11 | 中国石油天然气股份有限公司 | Coal bed gas horizontal well and construction method thereof |
| CN112963120A (en) * | 2021-01-27 | 2021-06-15 | 中国节能减排有限公司北京建筑光伏科技分公司 | Device and method for coal bed gas horizontal well completion |
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