CN220581004U - High-low pressure coupling under-pressure hole sealing device - Google Patents
High-low pressure coupling under-pressure hole sealing device Download PDFInfo
- Publication number
- CN220581004U CN220581004U CN202322003612.3U CN202322003612U CN220581004U CN 220581004 U CN220581004 U CN 220581004U CN 202322003612 U CN202322003612 U CN 202322003612U CN 220581004 U CN220581004 U CN 220581004U
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- hole
- pipe
- bag
- hole protection
- drilling
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- 238000007789 sealing Methods 0.000 title claims abstract description 54
- 230000008878 coupling Effects 0.000 title claims abstract description 16
- 238000010168 coupling process Methods 0.000 title claims abstract description 16
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 16
- 238000005553 drilling Methods 0.000 claims abstract description 31
- 239000007787 solid Substances 0.000 claims abstract description 20
- 239000003245 coal Substances 0.000 claims abstract description 17
- 239000003292 glue Substances 0.000 claims abstract description 3
- 239000011440 grout Substances 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 238000000605 extraction Methods 0.000 abstract description 8
- 230000008961 swelling Effects 0.000 abstract description 3
- 238000010276 construction Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 238000002347 injection Methods 0.000 description 6
- 239000007924 injection Substances 0.000 description 6
- 239000004568 cement Substances 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 238000005086 pumping Methods 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
Abstract
The utility model discloses a high-low pressure coupling pressurized hole sealing device, which comprises a hole protecting pipe, wherein the hole protecting pipe consists of a hole protecting solid pipe, a hole protecting sieve pipe, a hole protecting solid pipe and a hole protecting pipe flange which are sequentially connected from back to front, the hole protecting pipe is arranged in a drilling hole of a coal body, the hole protecting solid pipe at the rear end of the hole protecting pipe stretches into the bottom of the drilling hole, a swelling hole sealing bag is arranged on the outer walls of the front end and the rear end of the hole protecting solid pipe, a gap between the hole protecting solid pipe and the drilling hole can be sealed by swelling hole sealing bag glue, a closed space is formed between the hole protecting solid pipe and the drilling hole, one end of the outer side of the hole protecting pipe stretches into the closed space, the other end of the hole protecting solid pipe stretches out of the drilling hole is provided with a special bag for hole sealing, and the bag is provided with a bag with one end stretching into the rear part of the bag, and the other end of the bag stretches out of the front end of the hole protecting pipe is provided with a bag. The hole sealing depth is not less than 16m, the hole sealing grouting pressure is not less than 2Mpa, and the effective extraction time of drilling is more than 3 months.
Description
Technical Field
The utility model belongs to the technical field of gas extraction, and particularly relates to a high-low pressure coupling pressurized hole sealing device.
Background
The hole sealing process of the gas extraction drill hole plays a vital role in the extraction concentration of the drill hole. When the soft low-permeability coal seam is used for construction and drilling, the coal body is affected by mining, the cracks of the orifice coal section develop, meanwhile, the bottom-pumping roadway layer-penetrating drilling covers the range of 20m of roadway outline, the cracks of the 20m section from the orifice of the coal seam are secondarily developed during the construction of the coal seam, the hole collapse is serious, and higher requirements are put forward on the hole sealing length and the hole sealing tightness of the drilling hole.
The hole sealing technology of two plugs and one injection is commonly adopted in the prior art, and the following problems exist in the construction of a soft low-permeability coal seam: 1. and (3) hole sealing is short: the bag can not be lowered to the preset position of 16m due to irregular hole collapse caused by drilling, and the bag is easy to damage, so that the hole sealing depth can not be ensured. 2. The belt pressure is small: the hole wall can not be tightly supported by the bag, the hole loosens and breaks the height of the belt, the grouting pressure exceeds 0.8Mpa, and the hole or the coal wall has leakage. 3. The attenuation is fast: on the premise that the hole sealing pressure and the hole sealing depth cannot be guaranteed, the cement is affected by the dynamic pressure of the coal body to shrink with cracks, so that the tightness of a hole sealing section is reduced, the effective extraction time of a drill hole is less than 3 months, and the extraction effect of the drill hole is directly affected.
Disclosure of Invention
In order to solve the problems of short hole sealing, small belt pressure and quick attenuation existing in the construction of the coal seam drilling in a soft low-permeability coal seam by adopting a two-plug one-injection hole sealing process, the utility model provides a high-low pressure coupling belt pressure hole sealing device.
The technical scheme adopted by the utility model is as follows: the utility model provides a hole sealing device is pressed in high low pressure coupling area, including the hole protection pipe, the hole protection pipe is by the real pipe of hole protection, the hole protection screen pipe, the real pipe of hole protection and hole protection pipe flange pup joint constitution that connects gradually from the back to the front, the hole protection pipe flange pup joint is located the place ahead of drilling, the real pipe of hole protection that is located the hole protection pipe rear end stretches into the drilling bottom, the real pipe of hole protection that is located the hole protection pipe front end sets up the hole expansion hole sealing bag at the outer wall of its front end and rear end, hole expansion hole sealing bag is fried glue and can be blocked the space between the real pipe of hole protection and the drilling forms the enclosure space, the outside of hole protection pipe sets up one end and stretches into enclosure space, the other end stretches out outer thick liquid pipe and the outer thick liquid pipe that returns of drilling, the real pipe of hole protection that is located the hole protection pipe front end sets up dedicated bag hole sealing at its inside rear end, the bag is equipped with bag one end stretch into bag rear, the other end stretches out the thick liquid pipe and the thick liquid pipe that returns.
Further, the guard hole solid pipe and/or the guard hole sieve tube are formed by connecting multiple sections.
Further, a plurality of support columns are adhered to the peripheral side face of the multi-section pipe joint of the hole protection pipe.
Further, the length of the guard hole solid pipe at the front end of the guard hole pipe is 8m.
Further, the outer grout return pipe and the outer grout injection pipe are arranged at adjacent positions.
According to the high-low pressure coupling pressurized hole sealing device, the combined mode of the protective pipe sieve holes and the protective hole solid pipe is adopted by the protective hole pipe, the 'low pressure external plugging' and the 'high pressure internal injection' two coupling grouting hole sealing are implemented, the depth of the hole sealing hole is not less than 16m, the hole sealing grouting pressure is not less than 2Mpa hole sealing technical parameters, the hole drilling extraction concentration is more than 30%, and the effective hole drilling extraction time can be prolonged to more than 3 months.
Drawings
Fig. 1 is a schematic structural view of the present utility model.
1-hole protection solid pipe, 2-hole protection sieve pipe, 3-expansion hole sealing bag, 4-bag, 5-support column, 6-drilling hole, 7-bag grouting pipe, 8-bag grouting pipe, 9-outer grouting pipe, 10-outer grouting pipe, 11-hole protection pipe flange short circuit and 12-coal body.
Detailed Description
In order to better understand the purpose, structure and function of the present utility model, a high-low voltage coupling pressurized hole sealing device of the present utility model is described in further detail below with reference to the accompanying drawings.
As shown in fig. 1, a high-low pressure coupling hole sealing device with pressure comprises a hole protection pipe, wherein the hole protection pipe comprises a hole protection solid pipe 1, a hole protection screen pipe 2, a hole protection solid pipe 1 and a hole protection pipe flange short joint 11 which are sequentially connected from back to front, the hole protection pipe is arranged in a drill hole 6 of a coal body 12, the hole protection pipe flange short joint 11 is positioned in front of the drill hole 6, the hole protection solid pipe 1 positioned at the rear end of the hole protection pipe stretches into the bottom of the drill hole 6, a expansion hole sealing bag 3 is arranged on the outer walls of the front end and the rear end of the hole protection solid pipe 1, a gap between the expansion hole sealing bag 3 and the drill hole 6 can be sealed, one end of the outer side of the hole protection pipe stretches into the sealed space, the other end of the hole protection solid pipe 1 stretches out of the drill hole 6 is provided with a special hole sealing 4, and a bag 4 is provided with a grouting pipe 7 and a bag 8, one end of which stretches into the rear of the bag 4, and the other end of the bag stretches out of the front end of the hole protection pipe.
The process flow for construction by adopting the high-low pressure coupling pressurized hole sealing device of the utility model is as follows:
drilling holes 6 are formed in the coal body 12, the drilling holes 6 are drilled with drilling bits with diameter of 113mm, diameter of 153mm, diameter of 195mm and diameter of 245mm, the hole diameter of the drilling holes 6 is 245mm finally, a protection hole pipe with diameter of 160mm is arranged at the bottom of the drilling holes 6 after the hole expansion is finished, and the protection hole pipe is formed by connecting a protection hole solid pipe 1 with length of 2m and diameter of 160mm, three protection hole sieve pipes 2 with length of 2m and diameter of 160mm, four protection hole solid pipes 1 with length of 2m and diameter of 160mm, and a protection hole pipe flange short circuit 11 with length of 1m and diameter of 160mm by 17 m. And 5-6 support columns 5 are adhered to the peripheral side surface of the pipe joint of the protection hole and used for supporting the drill holes 6 to leave gaps, and the support columns 5 are in the form of blocks with the length of 100mm and the width of 20mm and the thickness of 15 mm.
The outer wall of the hole protecting pipe is respectively blocked by using a swelling hole sealing bag 3 at the inner 500mm and 8m of the hole opening, meanwhile, the outer grouting pipe 10 and the outer returning grouting pipe 11 are used for performing 'two-blocking one-grouting' grouting blocking of the 8m section outside the hole protecting pipe, the grouting pressure is 0.6-0.8Mpa, solidification is carried out for 24 hours after grouting is finished, the purpose of ensuring the outer blocking to be tight and bearing the high-pressure grouting of inner grouting is achieved, and the process step is called 'low-pressure outer blocking' for short.
After the cement blocked outside the low pressure is solidified for 24 hours, the special bag 4 to 7m is sealed from the lower hole in the inner part of the protecting hole pipe, grouting is started from the bag grouting pipe 7, when the expansion of the bag 4 and the sealing of the protecting hole pipe wall are realized, the pressure reaches 1.5Mpa, the bag explosion valve is opened to continue grouting, the whole 7m to the hole bottom in the protecting hole pipe is grouted, the grouting is permeated to the outer wall and the cracks of the coal body 12 through the protecting hole sieve pipe 2, the grouting pipe is pricked when the grouting pipe 8 returns to the slurry, grouting is stopped when the grouting pressure reaches more than 2Mpa, the cement is solidified for 24 hours, and the process step is called high-pressure inner grouting for short.
After the hole sealing is finished and cement is solidified for 24 hours, normally drilling construction drilling holes from the inside of the hole protection pipe, breaking all the 7m bags and the 7m cement, and normally connecting and extracting the hole protection pipe by using a flange and a flange short joint 11 after hole sealing construction and hole forming.
The utility model has tested 5 holes in the soft low permeability coal seam, the hole sealing depth is 17m, and the original hole sealing process of 'two plugs and one injection' is 8-10m. The hole sealing effect is obvious, the hole sealing pressure is only 0.6-0.8Mpa compared with the hole sealing process of 'two plugs and one injection', and the hole sealing pressure is more than 2 Mpa. The initial pumping concentration measured 24 hours after the test of 5 drilling holes is combined and pumped is above 50%, and the initial pumping concentration can still be above 30% after 3 months of pumping.
It will be understood that the utility model has been described in terms of several embodiments, and that various changes and equivalents may be made to these features and embodiments by those skilled in the art without departing from the spirit and scope of the utility model. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the utility model without departing from the essential scope thereof. Therefore, it is intended that the utility model not be limited to the particular embodiment disclosed, but that the utility model will include all embodiments falling within the scope of the appended claims.
Claims (5)
1. The utility model provides a hole sealing device is pressed in area of high low pressure coupling, including the hole protection pipe, a serial communication port, hole protection pipe is by the hole protection real pipe (1) that connects gradually before to from the back, hole protection screen pipe (2), hole protection real pipe (1) and hole protection pipe flange pup joint (11) are constituteed, the hole protection pipe is arranged in drilling (6) of coal body (12), hole protection pipe flange pup joint (11) are located the place ahead of drilling (6), hole protection real pipe (1) that is located hole protection pipe rear end stretches into drilling (6) bottom, hole protection real pipe (1) that is located hole protection pipe front end sets up the expansion hole sealing bag (3) at the outer wall of its front end and rear end, the expansion hole sealing bag (3) is fried glue and can be shutoff hole protection real pipe (1) and the space formation enclosure between drilling (6), the outside of hole protection pipe sets up one end and stretches into enclosure space, the other end stretches out outer grout pipe (9) and outer grout pipe (10) outside drilling (6), hole protection real pipe (1) that is located hole protection pipe front end stretches into hole protection pipe front end and hole protection pipe (4) and special hole protection pipe (4) and bag are equipped with the bag (4) and bag one end and stretch out the bag (7) and stretch out the bag and stretch into the bag.
2. The high-low pressure coupling pressurized hole sealing device according to claim 1, wherein the hole protecting solid pipe (1) and/or the hole protecting screen pipe (2) are formed by connecting multiple sections.
3. The high-low pressure coupling pressurized hole sealing device according to claim 2, wherein a plurality of support columns (5) are adhered to the peripheral side surface of the multi-section pipe joint of the hole protection pipe.
4. The high-low pressure coupling pressurized hole sealing device according to claim 1, wherein the length of the hole protecting solid pipe (1) positioned at the front end of the hole protecting pipe is 8m.
5. The high-low pressure coupling pressurized hole sealing device according to claim 1, wherein the outer grouting pipe (9) and the outer grouting pipe (10) are disposed at adjacent positions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322003612.3U CN220581004U (en) | 2023-07-28 | 2023-07-28 | High-low pressure coupling under-pressure hole sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322003612.3U CN220581004U (en) | 2023-07-28 | 2023-07-28 | High-low pressure coupling under-pressure hole sealing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220581004U true CN220581004U (en) | 2024-03-12 |
Family
ID=90110511
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322003612.3U Active CN220581004U (en) | 2023-07-28 | 2023-07-28 | High-low pressure coupling under-pressure hole sealing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220581004U (en) |
-
2023
- 2023-07-28 CN CN202322003612.3U patent/CN220581004U/en active Active
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