CN111852391A - Self-adaptive deformation gas extraction drilling and hole sealing device - Google Patents
Self-adaptive deformation gas extraction drilling and hole sealing device Download PDFInfo
- Publication number
- CN111852391A CN111852391A CN202010791439.6A CN202010791439A CN111852391A CN 111852391 A CN111852391 A CN 111852391A CN 202010791439 A CN202010791439 A CN 202010791439A CN 111852391 A CN111852391 A CN 111852391A
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- Prior art keywords
- hole sealing
- hole
- pipe
- extraction
- drill
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
Abstract
The invention relates to a self-adaptive deformation gas extraction drilling and hole sealing device, and belongs to the technical field of coal mine underground gas prevention and control engineering. The hole sealing device comprises a hole sealing unit and a hole sealing pipe, wherein one end of the hole sealing pipe arranged in a drill hole is an air inlet end, the hole sealing pipe is arranged in two times, and the air inlet ends of the hole sealing pipe in two times are all communicated with the hole sealing unit. The invention can realize the self-adaptive drilling deformation of the hole sealing pipe, does not need to adopt the traditional PVC straight pipe insertion or screw thread connection mode, and avoids the disconnection of the tube-to-tube insertion or screw thread connection caused by the deviation and deformation of the drilling hole; the grouting pressure-bearing capacity of the hole sealing pipe is further improved, the hole sealing pipe is prevented from being flattened under grouting pressure, slurry flows into the hole sealing pipe, the sealing performance of a grouting air chamber between hole sealing bags is guaranteed, and grouting pressure is improved to ensure that the slurry can effectively penetrate into coal cracks around the hole.
Description
Technical Field
The invention belongs to the technical field of coal mine underground gas prevention and control engineering, and relates to a self-adaptive deformation gas extraction drilling and sealing device.
Background
Effective sealing of the gas extraction drill hole and the coal body fracture around the hole is a basic premise for ensuring extraction negative pressure and improving gas extraction concentration. Research aiming at the concentration and the extraction amount of gas extraction is always a hotspot and a difficult point of the gas extraction; the research on the concentration and the extraction amount of the gas extraction drill hole can be of great significance for preventing and controlling coal and gas outburst, reaching the standard of coal bed gas extraction and reducing the gas emission amount in the production period of a mine.
At present, a mature and effective hole sealing mode for a gas extraction drill hole is a two-plugging one-injection hole sealing process, a hole sealing pipe and a hole sealing device are placed in the drill hole to a preset hole sealing position, and mechanical grouting is adopted to realize plugging of a hole sealing bag, a hole sealing section and coal body cracks around the drill hole, so that negative pressure extraction is guaranteed. However, the traditional two-plug one-injection hole sealing mode generally adopts flame-retardant antistatic PVC straight pipes with different lengths of 3-6m, and the pipes are connected in an inserting or screw thread mode; the straight pipe cannot well adapt to deviation and deformation in the hole, so that the insertion connection between pipes or the disconnection of screw connection is caused, the hole sealing pipe is pressed flat under the action of grouting pressure during grouting, and slurry flows into the hole sealing pipe along the disconnection position to cause the blockage of the hole sealing pipe; because the preset grouting pressure can not be reached, the slurry can not effectively penetrate into coal body cracks around the holes to be plugged. On the other hand, the traditional two-plugging one-injection hole sealing mode generally adopts 1 time of flame-retardant antistatic PVC straight pipes with the outer diameter of 50mm, and the flow control of the drilled holes in different extraction periods and different extraction attenuation aging characteristics cannot be realized.
Disclosure of Invention
In view of this, the invention aims to provide a gas extraction drilling and sealing device capable of adapting to deformation, which can adapt to deviation and deformation in a drill hole and prevent a hole sealing pipe from disjointing and blocking.
In order to achieve the purpose, the invention provides the following technical scheme: the hole sealing device comprises a hole sealing unit and a hole sealing pipe, wherein one end of the hole sealing pipe arranged in a drill hole is an air inlet end, the hole sealing pipe is a continuous pipe, the hole sealing pipe is formed in two times, and the air inlet end of the hole sealing pipe is communicated with the hole sealing unit.
Optionally, the hole sealing unit comprises a grouting pipe and a hole sealing bag arranged on the grouting pipe, a one-way valve is arranged between the grouting pipe and the hole sealing bag, and the grouting pipe injects slurry into the hole sealing bag through the one-way valve; the hole sealing bags are two, the two hole sealing bags are sequentially arranged along the grouting pipe, and the grouting pipe is further provided with an explosion valve which is arranged between the two hole sealing bags.
Optionally, the hole sealing pipe is a PE coil pipe.
Optionally, the two times of hole sealing pipes are respectively a first hole sealing pipe and a second hole sealing pipe, and the inner diameter of the first hole sealing pipe is larger than that of the second hole sealing pipe.
Optionally, the outer diameter and the inner diameter of the hole sealing pipe in one pass are 40mm and 32.6mm respectively, and the outer diameter and the inner diameter of the hole sealing pipe in the other pass are 32mm and 26mm respectively.
Optionally, the outer diameter and the inner diameter of the grouting pipe are 16mm and 12mm respectively.
Optionally, the grout pipe is a PE coil pipe.
Optionally, the length of the sealing pocket is 1000 mm.
The invention has the beneficial effects that: the flame-retardant antistatic continuous PE pipe formed by one-time thermoplastic coiling is used as a hole sealing pipe, so that the hole sealing pipe is self-adaptive to drilling deformation, the traditional PVC straight pipe splicing or screw thread connection mode is not needed, and the splicing or screw thread connection disjointing between pipes caused by the deviation and deformation of drilling is avoided; the grouting pressure-bearing capacity of the hole sealing pipe is further improved, the hole sealing pipe is prevented from being flattened under grouting pressure, slurry flows into the hole sealing pipe, the sealing performance of a grouting air chamber between hole sealing bags is guaranteed, and grouting pressure is improved to ensure that the slurry can effectively penetrate into coal cracks around the hole.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic structural diagram of a gas extraction drilling and hole sealing device with adaptive deformation;
FIG. 2 is a hole sealing schematic diagram of a gas extraction drilling and hole sealing device with adaptive deformation;
FIG. 3 is a schematic sectional view of a self-adaptive deformation gas extraction drilling and sealing device in the A-A direction.
Reference numerals: the hole sealing device comprises a first hole sealing pipe 1, a second hole sealing pipe 2, a hole sealing bag 3, a one-way valve 4, a grouting pipe 5, an explosion valve 6 and a drill hole 7.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
Referring to fig. 1 to 3, the self-adaptive deformation gas extraction drilling and sealing device includes a hole sealing unit and a hole sealing pipe, wherein one end of the hole sealing pipe disposed in a borehole 7 is an air inlet end, the hole sealing pipe is provided in two passes, and the air inlet ends of the two passes of the hole sealing pipe are both disposed through the hole sealing unit.
In the embodiment, the hole sealing unit comprises a grouting pipe 5 and a flame-retardant and antistatic hole sealing bag 3 arranged on the grouting pipe 5, a one-way valve 4 is arranged between the grouting pipe 5 and the hole sealing bag 3, and the grouting pipe 5 injects slurry into the hole sealing bag 3 through the one-way valve 4; the hole sealing bags 3 are two, the two hole sealing bags 3 are sequentially arranged along the grouting pipe 5, and the air inlet ends of the two hole sealing pipes penetrate through the two hole sealing bags 3 and are arranged in the drill hole 7. The grouting pipe 5 is also provided with an explosion valve 6, and the explosion valve 6 is arranged between the two hole sealing bags 3.
In this embodiment, the hole sealing pipe and the grouting pipe 5 are both flame-retardant antistatic continuous PE pipes formed by one-time thermoplastic coiling. The two hole sealing pipes are respectively a first hole sealing pipe 1 and a second hole sealing pipe 2. The inner diameter of the first hole sealing pipe 1 is larger than that of the second hole sealing pipe 2. The outer diameter and the inner diameter of the first hole sealing pipe 1 are 40mm and 32.60mm respectively, and the outer diameter and the inner diameter of the second hole sealing pipe 2 are 32mm and 26mm respectively. The outer diameter and the inner diameter of the grouting pipe 5 are 16mm and 12mm, respectively. The length of the hole sealing sac 3 is 1000 mm.
The flame-retardant antistatic continuous PE pipe formed by one-time thermoplastic coiling is used as a hole sealing pipe, the hole sealing pipe can self-adapt to the deformation of the drilled hole 7, the traditional PVC straight pipe splicing or screw thread connection mode is not needed, and the splicing or screw thread connection disjointing between pipes caused by the deviation and deformation of the drilled hole 7 is avoided; further improve the pressure-bearing capacity of hole sealing pipe slip casting, avoid causing the hole sealing pipe to flatten and the thick liquid flows in the hole sealing pipe under grouting pressure, guarantee the sealing performance of slip casting air chamber between the hole sealing bag 3, improve slip casting pressure in order to ensure that the thick liquid can effectively permeate the coal body crack around the hole.
By changing the traditional hole sealing pipe with the outer diameter of 50mm into the hole sealing pipes with the outer diameters of 40mm and 32mm, the gas flow cross-sectional area of the hole sealing pipe is increased, and a gas flow channel is increased. Combining the pressure relief deformation distribution characteristics of coal bodies around 7 holes of the gas extraction drill hole and the gas extraction attenuation aging characteristics: in the initial stage of pressure relief extraction, under the action of disturbance pressure relief and gas pressure of drilling of the drill hole 7, the gas of the drill hole 7 has natural emission characteristics, and the double-channel hole sealing pipe can overcome pipeline resistance under the action of lower negative pressure to realize concentration and extraction; in the middle stage of stable extraction, the double-channel hole sealing pipe is adjusted and increased to reasonable extraction negative pressure, coal bodies in the extraction influence range of hole periphery coal bodies and the drill hole 7 are fully extracted, the gas desorption seepage of the coal bodies is guaranteed, and concentration and extraction quantity extraction is realized; in the later stage of the attenuation extraction, the essential characteristics of the coal body, the extraction influence range of the drill hole 7 and the extraction flow and concentration attenuation characteristics are fully considered, the dual-channel hole sealing pipe is adjusted and converted into a single-channel hole sealing pipe, the extraction negative pressure is reasonably adjusted according to the extraction negative pressure and the gas flow channel requirement under the extraction attenuation characteristics, the external air is prevented from leaking into a pipe network through the crack channels around the hole under the negative pressure effect, and the concentration and extraction quantity extraction is realized.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (10)
1. The utility model provides a gas drainage drilling leak hunting and progressive type secondary hole sealing device which characterized in that: the hole sealing device comprises two hole sealing units and hole sealing pipes, wherein the two hole sealing units are sequentially arranged along the extending direction of a drill hole;
the hole sealing pipe is arranged at one end in the drill hole and is an air inlet end, the hole sealing pipe is arranged in two times, the air inlet end of the hole sealing pipe is arranged between the two hole sealing units in one time, and the air inlet end of the hole sealing pipe is communicated with the two hole sealing units in the other time.
2. The gas extraction borehole leak detection and progressive secondary hole sealing device according to claim 1, characterized in that: the hole sealing unit comprises a grouting pipe and a hole sealing bag arranged on the grouting pipe, a one-way valve is arranged between the grouting pipe and the hole sealing bag, and the grouting pipe injects slurry into the hole sealing bag through the one-way valve;
the hole sealing bags are two, the two hole sealing bags are sequentially arranged along the grouting pipe, and the grouting pipe is further provided with an explosion valve which is arranged between the two hole sealing bags.
3. The gas extraction borehole leak detection and progressive secondary hole sealing device according to claim 1, characterized in that: the hole sealing pipe is a continuous pipe.
4. The gas extraction borehole leak detection and progressive secondary hole sealing device according to claim 1, characterized in that: the hole sealing pipe comprises a first hole sealing pipe and a second hole sealing pipe, the air inlet end of the first hole sealing pipe is arranged between the two hole sealing units, the air inlet end of the second hole sealing pipe penetrates through the two hole sealing units, and the inner diameter of the first hole sealing pipe is larger than that of the second hole sealing pipe.
5. The gas extraction borehole leak detection and progressive secondary hole sealing device according to claim 1, characterized in that: the outer diameter and the inner diameter of the hole sealing pipe in one time are 40mm and 32.60mm respectively, and the outer diameter and the inner diameter of the hole sealing pipe in the other time are 32mm and 26mm respectively.
6. The gas extraction borehole leak detection and progressive secondary hole sealing device according to claim 2, characterized in that: the outer diameter and the inner diameter of the grouting pipe are respectively 16mm and 12 mm.
7. The gas extraction borehole leak detection and progressive secondary hole sealing device according to claim 1, characterized in that: the length of the hole sealing bag is 1000 mm.
8. The use method of the gas extraction borehole leak detection and progressive secondary hole sealing device is characterized in that the progressive secondary hole sealing device according to any one of claims 1 to 7 is used, and comprises the following steps:
leakage detection monitoring is carried out, after primary hole sealing is finished, the extraction concentration and the extraction purity of the gas in the drill hole are monitored, and the leakage condition of the drill hole is analyzed according to the extraction concentration, the extraction purity change characteristic and the attenuation characteristic, so that leakage detection is realized;
and in the step of secondary hole sealing and leakage detection monitoring, after the leakage detection of the drill hole is identified, hole sealing units which are closer to the hole opening of the drill hole are used for sealing the drill hole.
9. The use method of the gas extraction borehole leak detection and progressive secondary hole sealing device according to claim 8 is characterized in that: when the condition of the initial extraction gas leakage is analyzed, a plurality of drill holes are formed in the extraction area, and when the extraction negative pressure of any one drill hole in the extraction area is lower than 30% of the average extraction negative pressure of other drill holes, the drill hole is judged to be a leak detection identification.
10. The use method of the gas extraction borehole leak detection and progressive secondary hole sealing device according to claim 8 is characterized in that: during analysis of gas leakage conditions of extraction in the middle and later periods, drill holes with the same drill hole spacing and extraction time difference coefficient smaller than 30% in an extraction area belong to the same extraction unit, and when the extraction concentration of any one drill hole in the extraction unit is lower than the average extraction concentration of other drill holes by 30%, the drill hole is judged to be a leak detection identification;
the extraction time difference coefficient is eta,
wherein, TmaxThe number of extraction days, T, of the borehole with the longest extraction timeminThe number of extraction days of the drill hole with the shortest extraction time is obtained.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010791439.6A CN111852391A (en) | 2020-08-07 | 2020-08-07 | Self-adaptive deformation gas extraction drilling and hole sealing device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010791439.6A CN111852391A (en) | 2020-08-07 | 2020-08-07 | Self-adaptive deformation gas extraction drilling and hole sealing device |
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| CN111852391A true CN111852391A (en) | 2020-10-30 |
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| CN202010791439.6A Pending CN111852391A (en) | 2020-08-07 | 2020-08-07 | Self-adaptive deformation gas extraction drilling and hole sealing device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112465330A (en) * | 2020-11-23 | 2021-03-09 | 中煤科工集团重庆研究院有限公司 | Failure evaluation method for underground coal mine gas extraction drill hole |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112465330A (en) * | 2020-11-23 | 2021-03-09 | 中煤科工集团重庆研究院有限公司 | Failure evaluation method for underground coal mine gas extraction drill hole |
| CN112465330B (en) * | 2020-11-23 | 2022-04-22 | 中煤科工集团重庆研究院有限公司 | Failure evaluation method for underground coal mine gas extraction drill hole |
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Application publication date: 20201030 |
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