CN115263232A - Automatic hole sealing device for underground coal mine gas extraction drill hole and extraction method - Google Patents
Automatic hole sealing device for underground coal mine gas extraction drill hole and extraction method Download PDFInfo
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- CN115263232A CN115263232A CN202210871660.1A CN202210871660A CN115263232A CN 115263232 A CN115263232 A CN 115263232A CN 202210871660 A CN202210871660 A CN 202210871660A CN 115263232 A CN115263232 A CN 115263232A
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- inner tube
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- outer tube
- pipe
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- 238000007789 sealing Methods 0.000 title claims abstract description 66
- 238000000605 extraction Methods 0.000 title claims abstract description 46
- 239000003245 coal Substances 0.000 title claims abstract description 33
- 239000002775 capsule Substances 0.000 claims abstract description 78
- 238000005553 drilling Methods 0.000 claims description 30
- 239000002002 slurry Substances 0.000 claims description 27
- 239000011440 grout Substances 0.000 claims description 8
- 230000000903 blocking effect Effects 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 239000012466 permeate Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims 2
- 238000005516 engineering process Methods 0.000 description 4
- 238000005065 mining Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920003225 polyurethane elastomer Polymers 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000004026 adhesive bonding Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000007569 slipcasting Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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 OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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 OR ROCK 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
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Earth Drilling (AREA)
Abstract
The invention relates to an automatic hole sealing device for a coal mine underground gas extraction drill hole and an extraction method, which comprise a rear-end sleeve, a middle sleeve and a front-end sleeve which are sequentially connected from back to front, wherein two isolated channels are formed in each sleeve, inner channels of each sleeve are mutually connected in series and communicated, outer channels of each sleeve are also mutually connected in series and communicated, the inner channels are gas extraction channels, the outer channels are grouting channels, the outer sides of the outer channels of the rear-end sleeve and the front-end sleeve are respectively provided with an expandable capsule, gaps between the rear-end sleeve and the drill hole and between the front-end sleeve and the drill hole are respectively sealed after the capsules expand, the outer channels of the rear-end sleeve and the front-end sleeve are communicated with the space of the capsules through one-way valves, the outer channels of the rear-end sleeve are provided with one-way valves communicated with the drill hole, the size of each sleeve is matched with the size of a drill rod, and the sleeves are sequentially sent into the drill hole.
Description
Technical Field
The invention belongs to the technical field of hole sealing of underground coal mine gas extraction drill holes, and relates to an automatic hole sealing device and an extraction method for an underground coal mine gas extraction drill hole.
Background
At present, a two-plugging one-injecting hole sealing technology is commonly adopted for sealing a gas extraction drill hole in a coal mine, the technology needs manual temporary assembly of a hole sealing device, two bags, a grouting pipe and the gas extraction pipe are manually put into the drill hole, and finally grouting and hole sealing are carried out. This technique has the following disadvantages: (1) The hole sealing device needs to be assembled manually and the hole sealing is carried out manually, so that the automation degree is low, the hole sealing procedure is complex, and the labor intensity is high; (2) The length of the hole packer is fixed, so that the hole packer is inconvenient to use under the condition that the requirement on the hole sealing length is changed; and (3) the structure of the hole packer is redundant and complicated.
In order to solve the problems, a multi-channel automatic hole packer is proposed, but the device has the following defects: (1) The working principle and structure of the hole packer are complex, and the integration level is high; (2) The main material of the hole packer is metal with high hardness, the hole packer is consolidated with the coal seam into a whole after grouting and cannot be taken out, and the coal cutter is used for avoiding cutting the metal material when cutting the coal wall, so that inconvenience is caused to subsequent coal mining. (3) The cutting of metal material by a coal cutter generates sparks, which may induce a gas explosion.
Disclosure of Invention
In view of the above, the invention aims to provide an automatic hole sealing device for a coal mine underground gas extraction drill hole, which is used for solving the problems that an existing hole sealing device is complex in structure, needs manual hole sealing, is fixed in length and low in hole sealing automation degree.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides an automatic hole sealing device of colliery gas drainage drilling in pit, include the rear end sleeve pipe, middle sleeve pipe and the front end sleeve pipe that connect gradually from back to front, middle sleeve pipe sets up a plurality ofly, wherein form the binary channels that keep apart each other in every sheathed tube, the interior passageway of every sheathed tube is the intercommunication of establishing ties each other, the outer passageway of every sheathed tube is also the intercommunication of establishing ties each other, the interior passageway is the gas drainage passageway, the outer passageway is the slip casting passageway, the outer passageway outside of rear end sleeve pipe and front end sleeve pipe still is provided with the capsule that can expand respectively, the clearance between rear end sleeve pipe and front end sleeve pipe and the drilling is blocked respectively after the capsule inflation, communicate through the check valve in the space of rear end sleeve pipe and front end sleeve pipe and the capsule, open the check valve that communicates with the drilling on the outer passageway of rear end sleeve pipe, every sleeve pipe outer tube size and drilling rod size match, utilize automatic drilling machine to connect gradually the front end sleeve pipe, middle sleeve pipe and rear end sleeve pipe, and send the sleeve pipe into the drilling in proper order.
Further, the rear end sleeve comprises a rear end inner tube, a rear end outer tube female joint, a rear end outer tube capsule, a rear end grout outlet tube section and a rear end outer tube male joint are sequentially sleeved outside the rear end inner tube from back to front, spaces formed between the rear end outer tube female joint, the rear end outer tube capsule, the rear end grout outlet tube section and the outer wall of the rear end outer tube and the rear end inner tube are respectively an outer channel I, an outer channel II, an outer channel III and an outer channel IV, the outer channel I, the outer channel II, the outer channel III and the outer channel IV are communicated, the rear end outer tube capsule comprises a rear end outer tube sleeved on the rear end inner tube, the space between the rear end outer tube and the rear end inner tube is the outer channel II, the rear end outer tube is sleeved with the rear end capsule, the space between the rear end capsule and the rear end outer tube is a capsule space I, the rear end capsule can expand, a one-way valve I is arranged on the rear end outer tube, and the outlet direction of the one-way valve I is a capsule space I.
Furthermore, a second one-way valve is arranged on the rear-end slurry outlet pipe section, and the outlet direction of the second one-way valve is a space formed by the hole sealing device and the drilled hole.
Furthermore, the rear part of the rear end inner tube is provided with a rear end inner tube female joint, the front part of the rear end inner tube is provided with a rear end inner tube male joint, a detachable tube plug is assembled in the rear end inner tube female joint, and the rear end inner tube male joint is used for being connected with the middle inner tube of the middle sleeve.
Furthermore, the rear end inner tube is connected with the rear end outer tube female connector through a rear end strip-shaped supporting structure, and a rear end strip-shaped positioning structure is arranged between the rear end inner tube and the rear end outer tube male connector for positioning.
Furthermore, middle sleeve pipe includes middle inner tube, and the outside of middle inner tube overlaps from the back to the front in proper order has middle outer tube female joint, middle outer tube and middle outer tube male joint end to end, and middle outer tube female joint is connected with the rear end sleeve pipe, and middle outer tube male joint is used for being connected with the front end sleeve pipe, and the rear end of middle inner tube is the middle inner tube female joint with the rear end inner tube connection of rear end sleeve pipe, and the front end of middle inner tube is the middle inner tube male joint with the front end inner tube connection of front end sleeve pipe.
Furthermore, the middle inner tube is connected with the middle outer tube female joint through a middle strip-shaped supporting structure, and a middle strip-shaped positioning structure is arranged between the middle inner tube and the middle outer tube male joint for positioning.
Further, the front end sleeve pipe includes the front end inner tube, it has front end outer tube female joint and front end outer tube capsule to overlap in proper order from the back to the front on the front end inner tube, front end outer tube female joint is used for being connected with middle bushing, the rear end of front end inner tube is front end inner tube female joint, front end inner tube female joint can be connected with middle inner tube male joint, front end outer tube capsule is including the front end outer tube of cover on the front end inner tube, the outside cover of front end outer tube has the front end capsule, be provided with check valve three on the front end outer tube, the export of check valve three is inside the front end capsule, be connected through front end strip bearing structure between front end inner tube and the front end outer tube female joint, seal through front end location seal structure between the rear portion of front end inner tube and front end outer tube.
Furthermore, the front end of the front end inner pipe extends to a position beyond the front end outer pipe capsule, and the front end inner pipe positioned outside the front end outer pipe capsule is a sieve pipe for blocking large particles in the drill hole.
An extraction method of an automatic hole sealing device for a coal mine underground gas extraction drill hole is characterized by comprising the following steps:
s1: the rear end casing, the middle casing and the front end casing are respectively placed in a drill rod box of the automatic drilling machine;
s2: the mechanical arm of the drilling machine takes out the casing pipe at the front end and sends the casing pipe into the holder by the driving drill rod;
s3: the middle sleeve is taken out by the mechanical arm of the drilling machine and is sent by the driving drill rod to be connected with the sleeve at the front end;
s4: adding a plurality of middle sleeves as required, wherein the front sleeve and part of the middle sleeves are conveyed into a drill hole by a drilling machine;
s5: after the middle casing is connected, the mechanical arm of the drilling machine takes out the casing at the rear end, and the casing is sent into a drill hole by the driving drill rod and connected with the middle casing;
s6: grouting, wherein a driving drill rod of the drilling machine is still connected with a rear-end sleeve at the moment, hole sealing slurry is injected from the center of an outer channel, the slurry enters a grouting channel formed by the inner and outer pipes of the hole sealing device, the pressure starts to rise after the slurry is filled in the grouting channel until the outlet pressure of a one-way valve I and the outlet pressure of a one-way valve III are reached, the slurry simultaneously enters a front-end capsule and a rear-end capsule, the two capsules start to expand and are gradually attached to the inner wall of the drill hole, when the capsules expand to a certain degree, the grouting pressure reaches the outlet pressure of the one-way valve II, the slurry starts to enter a space formed by the drill hole and the hole sealing device, grouting is continued, the slurry is filled in the drill hole, and pressure maintaining is continued, so that the slurry fully permeates cracks in the drill hole;
s7: withdrawing the driving drill rod, and cleaning the driving drill rod by introducing water;
s8: and (5) gas extraction, namely opening the pipe plug to finish the gas extraction.
The invention has the beneficial effects that:
(1) The invention discloses an automatic hole sealing device for a coal mine underground gas extraction drill hole, which is characterized in that a front end sleeve, a middle sleeve and a rear end sleeve are sequentially connected to form two channels of grouting and gas extraction, and the hole sealing stage is as follows: the inner pipe is sealed by using a pipe plug, a channel formed by the inner pipe and the outer pipe is a grouting channel, and capsules at two ends of the hole packer expand after grouting and are attached to the inner wall of the drilled hole, so that 'double plugging' is realized; and (3) continuing grouting, wherein a space formed by the drill hole and the hole sealing device completes 'first grouting', and a gas extraction stage: and pulling the pipe plug, and taking the inner pipe as a gas flow channel for gas extraction.
(2) The invention discloses an automatic hole sealing device for a coal mine underground gas extraction drill hole, which is characterized in that the hole sealing device with two plugs and one injection is designed into a mode of combining a plurality of drill rods, and a hole sealing device is sent into the drill hole through an automatic drilling machine, so that the hole sealing effect is ensured, meanwhile, the automation of hole sealing is realized to a certain extent, the manual labor intensity is reduced, the hole sealing program is simplified, and the hole sealing efficiency and the hole sealing precision are improved.
(3) The automatic hole sealing device for the coal mine underground gas extraction drill hole can flexibly select the number of the middle sleeves, and the actual requirement on hole sealing length is met by increasing or decreasing the number of the middle sleeves;
(4) The automatic hole sealing device for the drill pipe type underground gas extraction drill hole of the coal mine adopts polyurethane rubber and hard PVC plastic as main body materials, and after gas extraction is finished, the coal cutter can directly cut a coal and a hole sealing device in a coal wall, the hole sealing device does not need to be removed, coal mining is convenient, and the coal mining safety is improved.
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 an automatic hole sealing device;
FIG. 2 is a schematic structural view of a rear end sleeve;
FIG. 3 is a schematic structural view of the rear end inner tube;
FIG. 4 is a schematic view of the construction of the intermediate sleeve;
FIG. 5 is a schematic structural view of the intermediate inner tube;
FIG. 6 is a schematic structural view of the front end sleeve;
fig. 7 is a schematic structural view of the front end inner tube.
Reference numerals:
1. a rear end sleeve; 11. pipe blocking; 12. a rear end outer tube female joint; 13. a rear end outer tube capsule; 131. a rear end outer tube; 132. a one-way valve I; 133. a back-end capsule; 14. a rear end inner tube; 141. a rear end inner tube female joint; 142. a rear end strip support structure; 143. a rear end strip-shaped positioning structure; 144. a rear end inner tube male joint; 15. a rear end slurry outlet pipe section; 151. a second one-way valve; 16. a rear end outer tube male joint; 2. an intermediate sleeve; 21. a middle outer tube female joint; 22. an intermediate outer tube; 23. a middle inner tube; 231. a middle inner tube female joint; 232. a middle strip-shaped support structure; 233. a middle strip-shaped positioning structure; 234. a middle inner tube male joint; 24. a middle outer tube male joint; 3. a front end sleeve; 31. a front end outer tube female joint; 32. a front end outer tube capsule; 321. a front end outer tube; 322. a front end capsule; 323. a one-way valve III; 33. a front end inner tube; 331. a front end inner tube female joint; 332. a front end strip support structure; 333. the front end is positioned and sealed; 334. a screen pipe.
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 7, the automatic hole sealing device for the gas extraction borehole in the coal mine comprises a rear casing 1, an intermediate casing 2 and a front casing 3 which are sequentially connected from back to front, wherein the number of the intermediate casings 2 can be set according to requirements, two isolated channels are formed in each casing, the inner channels are communicated in series, and the outer channels are also communicated in series. The outer sides of the outer channels of the rear end sleeve 1 and the front end sleeve 3 are respectively provided with a capsule capable of expanding, and after the capsules expand, gaps between the rear end sleeve 1 and the drill hole and gaps between the front end sleeve 3 and the drill hole are respectively plugged. The outer channels of the rear end sleeve 1 and the front end sleeve 3 are communicated with the space of the capsule through a one-way valve. The outer channel of the rear end casing 1 is provided with a one-way valve communicated with the drill hole, so that hole sealing slurry can enter a space between the middle casing 2 and the drill hole from the one-way valve. The size of the outer pipe of each casing pipe is matched with the size of the drill pipe, the adjacent casing pipes are connected through threads, the front-end casing pipe 3, the middle casing pipe 2 and the rear-end casing pipe 1 are sequentially connected through an automatic drilling machine, and the casing pipes are sequentially sent into the drill hole.
As shown in fig. 2 and 3, the rear casing 1 includes a rear inner tube 14, a rear outer tube female joint 12, a rear outer tube bladder 13, a rear grout outlet tube section 15 and a rear outer tube male joint 16 are sequentially sleeved outside the rear inner tube 14 from back to front, the rear outer tube female joint 12, the rear outer tube bladder 13, the rear grout outlet tube section 15 and the rear outer tube male joint 16 are coaxial with the rear inner tube 14, the rear outer tube female joint 12 is connected with the rear end of the rear outer tube bladder 13 through a screw thread, the front end of the rear outer tube bladder 13 is connected with the rear end of the rear grout outlet tube section 15 through a screw thread, and the front end of the rear grout outlet tube section 15 is connected with the rear end of the rear outer tube male joint 16 through a screw thread. The space formed between the rear-end outer tube female connector 12 and the outer wall of the rear-end inner tube 14 is an outer channel I, the space formed between the rear-end outer tube capsule 13 and the outer wall of the rear-end inner tube 14 is an outer channel II, the space formed between the rear-end grout outlet tube section 15 and the outer wall of the rear-end inner tube 14 is an outer channel III, the space formed between the rear-end outer tube male connector 16 and the outer wall of the rear-end inner tube 14 is an outer channel IV, and the outer channel I, the outer channel II, the outer channel III and the outer channel IV are communicated to form a grouting channel.
Rear end outer tube capsule 13 is including the rear end outer tube 131 of cover on rear end inner tube 14, and the space between rear end outer tube 131 and the rear end inner tube 14 is outer passageway two, and the outside cover of rear end outer tube 131 has rear end capsule 133, and the space between rear end capsule 133 and the rear end outer tube 131 is capsule space one, and rear end capsule 133 can expand, and the inflation back, the lateral wall and the drilling inner wall of rear end capsule 133 paste tightly, are provided with check valve 132 on the rear end outer tube 131, and the exit direction of check valve 132 is capsule space one.
And a second check valve 151 is arranged on the rear-end slurry outlet pipe section 15, and the outlet direction of the second check valve 151 is a space formed by the hole sealing device and the drill hole.
The rear part of the rear end inner tube 14 is a rear end inner tube female joint 141, the front part of the rear end inner tube 14 is a rear end inner tube male joint 144, and a detachable plug 11 is assembled in the rear end inner tube female joint 141 to plug the rear end inner tube 14.
The rear end inner tube 14 is connected with the rear end outer tube female joint 12 through the rear end strip-shaped supporting structure 142, the rear end strip-shaped supporting structure 142 is attached to the rear end outer tube female joint 12 to support a pipeline, and the rear end strip-shaped supporting structure 142 is not of an annular structure and does not seal an outer channel I, so that the rear end strip-shaped supporting structure 142 plays a role in supporting the rear end inner tube 14.
A rear end strip-shaped positioning structure 143 is arranged between the rear end inner tube 14 and the rear end outer tube male joint 16, the rear end strip-shaped positioning structure 143 is clamped in a groove of the rear end outer tube male joint 16 and does not block the outer channel four, and the rear end strip-shaped positioning structure plays a role in supporting the rear end inner tube 14 and preventing the rear end inner tube 14 from axially moving.
The inner hole of the rear-end inner pipe 14 is a gas extraction channel, and a channel formed by connecting the first outer channel, the second outer channel, the third outer channel and the fourth outer channel in series is a grouting channel. After the pipe plug 11 is assembled, the pipe plug 11 prevents slurry from entering a gas extraction channel, and when gas extraction is performed, the pipe plug 11 is opened to perform gas extraction.
As shown in fig. 4 and 5, the middle casing 2 includes a middle inner tube 23, the middle inner tube 23 is sleeved with a middle outer tube female joint 21, a middle outer tube 22 and a middle outer tube male joint 24 from back to front in sequence, an inner hole of the middle outer tube female joint 21 is provided with a tapered thread connected with the rear end outer tube male joint 16, the middle outer tube female joint 21 is connected with the rear end outer tube male joint 16, and communication between the rear end casing 1 and the middle casing 2 is completed.
The space between the middle outer pipe female joint 21, the middle outer pipe 22, the middle outer pipe male joint 24 and the middle inner pipe 23 is respectively an outer channel five, an outer channel six and an outer channel seven, and the outer channel five, the outer channel six and the outer channel seven are connected in series to form a grouting channel. The rear end of the middle inner tube 23 is a middle inner tube female joint 231, and the smooth inner surface of the middle inner tube female joint 231 is attached to the smooth outer surface of the rear end inner tube male joint 144, so that the communication between the rear end inner tube 14 and the middle inner tube 23 is completed. The front end of the middle inner tube 23 is a middle inner tube male connector 231.
The middle inner tube 23 and the middle outer tube female joint 21 are connected through the middle strip-shaped supporting structure 232, the middle strip-shaped supporting structure 232 is attached to the middle outer tube female joint 21 to support a pipeline, and the middle strip-shaped supporting structure 232 is a strip-shaped structure and is not an annular structure, so that the middle strip-shaped supporting structure 232 cannot seal an outer channel I, and the middle inner tube 23 is supported.
A middle strip-shaped positioning structure 233 is arranged between the middle inner tube 23 and the middle outer tube male connector 24, and the middle strip-shaped positioning structure 233 is clamped in the groove of the middle outer tube male connector 24 and does not block the outer channel five, so as to play a role in supporting the middle inner tube 23 and preventing the middle inner tube 23 from axially moving.
The number of the middle sleeves 2 is flexibly selected according to the actual requirement of the hole sealing length, only one middle sleeve 2 can be directly connected with the front-end sleeve 3, and more than two middle sleeves 2 can also be connected in sequence to lengthen the whole hole sealing device and meet the requirement of the hole sealing length.
As shown in fig. 6 and 7, the front sleeve 3 includes a front inner tube 33, a front outer tube female connector 31 and a front outer tube bladder 32 are sequentially sleeved on the front inner tube 33 from back to front, the front outer tube female connector 31 and the front outer tube bladder 32 are connected by threads, spaces between the front outer tube female connector 31 and the front outer tube bladder 32 and the front inner tube 33 are an outer passage eight and an outer passage nine, respectively, and the outer passage eight is communicated with the outer passage nine. The inner hole of the front end outer tube female joint 31 is provided with a tapered thread connected with the middle outer tube male joint 24, and the front end outer tube female joint 31 is connected with the middle outer tube male joint 24 to complete communication between the front end sleeve 3 and the middle sleeve 2.
The rear end of the front end inner tube 33 is provided with a front end inner tube female joint 331, and the front end inner tube female joint 331 can be connected with the middle inner tube male joint 234 to realize the connection between the middle inner tube 23 and the front end inner tube 33. The front end outer tube capsule 32 comprises a front end outer tube 321 sleeved on the front end inner tube 33, a front end capsule 322 is sleeved outside the front end outer tube 321, a space between the front end capsule 322 and the front end outer tube 321 is a capsule space II, and the front end capsule 322 can expand to enable the outer side wall of the front end capsule to be tightly attached to the inner side wall of the drilled hole. The front end outer pipe 321 is provided with a one-way valve III 323, and the outlet of the one-way valve III 323 is arranged inside the front end capsule 322.
The front end inner tube 33 is connected with the front end outer tube female joint 31 through the front end strip-shaped supporting structure 332, the front end strip-shaped supporting structure 332 is attached to the front end outer tube female joint 31 to support a pipeline, and the front end strip-shaped supporting structure 332 is not of an annular structure and does not seal an outer channel eight, so that the front end strip-shaped supporting structure 332 plays a role in supporting the middle inner tube 23.
The front end of the front end inner pipe 33 extends to a position beyond the front end outer pipe capsule 32, the front end inner pipe 33 positioned outside the front end outer pipe capsule 32 is a sieve pipe 334, the sieve pipe 334 is formed by forming a plurality of holes in the side wall of the front end inner pipe 33, and the sieve pipe 334 plays a role in blocking large-particle coal rocks in a drill hole and preventing a gas extraction pipe from being blocked.
The front end inner tube 33 and the rear part of the front end outer tube 321 are sealed through a front end positioning sealing structure 333, and the surface of the front end positioning sealing structure 333 is provided with external threads which can be in threaded connection with the front end outer tube 321, so that the grouting channel is plugged, and the concentricity of the inner tube and the outer tube is kept.
The outer channel I, the outer channel II, the outer channel III, the outer channel IV, the outer channel V, the outer channel VI, the outer channel VII, the outer channel VIII and the outer channel IX are connected in series to form a grouting channel.
Preferably, the rear end capsule 133 and the front end capsule 322 are made of polyurethane rubber, and the polyurethane rubber has strong extensibility and tensile length, so that the expansion of the capsules is facilitated. Preferably, the contact part of the rear end capsule 133 and the rear end outer tube 131 is bonded by gluing, and the contact part of the front end capsule 322 and the front end outer tube 321 is bonded by gluing.
The materials of other parts except the rear end capsule 133 and the front end capsule 322 are hard PVC plastic for mining, and the PVC plastic has high hardness and can bear high grouting pressure.
The working principle of the invention is as follows:
(1) The rear end sleeve 1, the middle sleeve 2 and the front end sleeve 3 are respectively placed in a drill rod box of an automatic drilling machine;
(2) The front end casing 3 is taken out by the mechanical arm of the drilling machine and is sent into the holder by the driving drill rod;
(3) The middle casing 2 is taken out by the mechanical arm of the drilling machine and is connected with the front casing 3 by the driving drill rod;
(4) Adding a plurality of middle sleeves 2 as required, wherein the front-end sleeve 3 and part of the middle sleeves 2 are conveyed into a drill hole by a drilling machine;
(5) After the middle casing 2 is connected, the mechanical arm of the drilling machine takes out the rear casing 1, and the rear casing is sent into a drill hole by a driving drill rod and connected with the middle casing 2;
(6) Grouting: at the moment, the driving drill rod of the drilling machine is still connected with the rear-end sleeve 1, hole sealing slurry is injected from the center of the outer channel, and the slurry enters a grouting channel formed by the inner pipe and the outer pipe of the hole sealing device. After the grouting pipeline is filled with the slurry, the pressure begins to rise until the outlet pressure of the one-way valve I132 and the one-way valve III 323 is reached, the slurry simultaneously enters the front end capsule 322 and the rear end capsule 133, the two capsules begin to expand and gradually attach to the inner wall of the drill hole, and at the moment, the two-blocking and one-injecting hole sealing technology is completed; when the capsule expands to a certain degree, the grouting pressure reaches the outlet pressure of the second one-way valve 151, the slurry starts to enter a space formed by the drill hole and the hole sealing device, the grouting is continued, the slurry is filled in the drill hole, the pressure is maintained continuously, the slurry fully permeates cracks in the drill hole, and at the moment, the 'one-injection' in the 'two-plugging one-injection' hole sealing technology is completed.
(7) And withdrawing the driving drill rod, and cleaning the driving drill rod by water.
(8) Gas extraction: and opening the pipe plug 11 to finish gas extraction.
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 an automatic hole sealing device of colliery downhole gas drainage drilling which characterized in that: the automatic drilling machine comprises a rear-end sleeve (1), an intermediate sleeve (2) and a front-end sleeve (3) which are sequentially connected from back to front, wherein the intermediate sleeve (2) is provided with a plurality of double channels which are isolated from each other, the inner channel of each sleeve is communicated in series with each other, the outer channel of each sleeve is also communicated in series with each other, the inner channel is a gas extraction channel, the outer channel is a grouting channel, capsules capable of expanding are further arranged on the outer sides of the outer channels of the rear-end sleeve (1) and the front-end sleeve (3), gaps between the rear-end sleeve (1) and the front-end sleeve (3) and drill holes are respectively plugged after the capsules expand, the outer channels of the rear-end sleeve (1) and the front-end sleeve (3) are communicated with the spaces of the capsules through one-way valves, one-way valves communicated with the drill holes are arranged on the outer channels of the rear-end sleeve (1), the size of each sleeve is matched with the size of a drill rod, and an automatic drilling machine is sequentially connected with the front-end sleeve (3), the intermediate sleeve (2) and the rear-end sleeve (1), and the drill holes are sequentially sent into the drill holes.
2. The automatic hole sealing device for the coal mine underground gas extraction drill hole according to claim 1, characterized in that: rear end sleeve pipe (1) includes rear end inner tube (14), rear end inner tube (14) outside from the back to preceding cover in proper order has rear end outer tube female joint (12), rear end outer tube capsule (13), rear end play thick liquid pipe section (15) and rear end outer tube male joint (16) of end to end connection, rear end outer tube female joint (12), rear end outer tube capsule (13), rear end play thick liquid pipe section (15) and the space that forms between rear end outer tube (131) and rear end inner tube (14) outer wall are outer passageway one respectively, outer passageway two, outer passageway three and outer passageway four, outer passageway one, outer passageway two, outer passageway three and outer passageway four intercommunication, rear end outer tube (13) is including rear end outer tube (131) of cover on rear end inner tube (14), the outer tube between rear end outer tube (131) and rear end inner tube (14) is outer passageway two, rear end outer tube (131) outside cover has rear end capsule (133), the space between rear end capsule (133) and rear end inner tube (131) is one, the one-way valve (132) can be provided with one-way valve in rear end capsule (132).
3. The automatic hole sealing device for the coal mine underground gas extraction drill hole according to claim 2, characterized in that: a second check valve (151) is arranged on the rear end grout outlet pipe section (15), and the outlet direction of the second check valve (151) is a space formed by the hole sealing device and the drill hole.
4. The automatic hole sealing device for the coal mine underground gas extraction drill hole according to claim 2, characterized in that: the rear part of the rear end inner tube (14) is provided with a rear end inner tube female joint (141), the front part of the rear end inner tube (14) is provided with a rear end inner tube male joint (144), a detachable pipe plug (11) is assembled in the rear end inner tube female joint (141), and the rear end inner tube male joint (144) is used for being connected with the middle inner tube (23) of the middle sleeve (2).
5. The automatic hole sealing device for the coal mine underground gas extraction drill hole according to claim 2, characterized in that: the rear end inner tube (14) is connected with the rear end outer tube female joint (12) through a rear end strip-shaped supporting structure (142), and a rear end strip-shaped positioning structure (143) is arranged between the rear end inner tube (14) and the rear end outer tube male joint (16) for positioning.
6. The automatic hole sealing device for the coal mine underground gas extraction drill hole according to claim 1, characterized in that: middle sleeve pipe (2) are including middle inner tube (23), the outside of middle inner tube (23) has middle outer tube female joint (21) of end to end from the back to preceding cover in proper order, middle outer tube (21) and middle outer tube male joint (24), middle outer tube female joint (21) are connected with rear end sleeve pipe (1), middle outer tube male joint (24) are used for being connected with front end sleeve pipe (3), the rear end of middle inner tube (23) is middle inner tube female joint (231) of being connected with rear end inner tube (14) of rear end sleeve pipe (1), the front end of middle inner tube (23) is middle male joint (234) of being connected with front end inner tube (33) of front end sleeve pipe (3).
7. The automatic hole sealing device for the coal mine underground gas extraction drill hole according to claim 6, characterized in that: the middle inner pipe (23) is connected with the middle outer pipe female joint (24) through a middle strip-shaped supporting structure (232), and a middle strip-shaped positioning structure (233) is arranged between the middle inner pipe (23) and the middle outer pipe male joint (24) for positioning.
8. The automatic hole sealing device for the coal mine underground gas extraction drill hole according to claim 1, characterized in that: front end sleeve pipe (3) include front end inner tube (33), the cover has front end outer tube female joint (31) and front end outer tube capsule (32) in proper order from the back to the front on front inner tube (33), front end outer tube female joint (31) are used for being connected with middle sleeve pipe (2), the rear end of front end inner tube (33) is front end inner tube female joint (331), front end inner tube female joint (331) can be connected with middle inner tube male joint (234) of middle sleeve pipe (2), front end outer tube capsule (32) are including front end outer tube (321) of cover on front end inner tube (33), front end outer tube (321) outside cover has front end capsule (322), be provided with check valve three (323) on front end outer tube (321), the export of check valve three (323) is inside front end capsule (322), connect through front end strip bearing structure (332) between front end inner tube (33) and the front end outer tube female joint (31), front end inner tube (33) and the rear portion of front end outer tube (321) are fixed a position through front end bar seal structure (333).
9. The automatic hole sealing device for the coal mine underground gas extraction drill hole according to claim 8, characterized in that: the front end of the front end inner pipe (33) extends to exceed the front end outer pipe capsule (32), and the front end inner pipe (33) positioned outside the front end outer pipe capsule (32) is a sieve pipe (334) which plays a role of blocking large particles in a drill hole.
10. The extraction method of the automatic hole sealing device for the underground coal mine gas extraction drill hole according to any one of the utilization claims 1 to 9 is characterized by comprising the following steps of:
s1: the rear end casing (1), the middle casing (2) and the front end casing (3) are respectively placed in a drill rod box of the automatic drilling machine;
s2: the front end casing (3) is taken out by the mechanical arm of the drilling machine and is sent into the holder by the driving drill rod;
s3: the middle casing (2) is taken out by the mechanical arm of the drilling machine and is connected with the front casing (3) by the driving drill rod;
s4: adding a plurality of middle sleeves (2) according to the requirements, wherein the front sleeve (3) and part of the middle sleeves (2) are fed into a drill hole by a drilling machine;
s5: after the middle casing (2) is connected, the mechanical arm of the drilling machine takes out the casing (1) at the rear end, and the casing is sent into a drill hole by a driving drill rod and connected with the middle casing (2);
s6: grouting, wherein the active drill rod of the drilling machine is still connected with the rear-end casing (1), hole sealing slurry is injected from the center of an outer channel, the slurry enters a grouting channel formed by the inner pipe and the outer pipe of the hole sealing device, the pressure starts to rise after the slurry is filled in the grouting channel until the pressure reaches the outlet pressure of a one-way valve I (132) and a one-way valve III (323), the slurry simultaneously enters a front-end capsule (322) and a rear-end capsule (133), the two capsules start to expand and are gradually attached to the inner wall of the drill hole, when the capsules expand to a certain degree, the grouting pressure reaches the outlet pressure of the one-way valve II (151), the slurry starts to enter a space formed by the drill hole and the hole sealing device, the slurry is continuously grouted, the slurry is filled in the drill hole, and the pressure is continuously maintained, so that the slurry fully permeates cracks in the drill hole;
s7: withdrawing the driving drill rod, and cleaning the driving drill rod by water;
s8: and (5) gas extraction, namely opening the pipe plug (11) to finish the gas extraction.
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| CN202210871660.1A CN115263232A (en) | 2022-07-22 | 2022-07-22 | Automatic hole sealing device for underground coal mine gas extraction drill hole and extraction method |
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| CN202210871660.1A CN115263232A (en) | 2022-07-22 | 2022-07-22 | Automatic hole sealing device for underground coal mine gas extraction drill hole and extraction method |
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