CN116696277A - Gas extraction drilling secondary hole sealing device and method - Google Patents
Gas extraction drilling secondary hole sealing device and method Download PDFInfo
- Publication number
- CN116696277A CN116696277A CN202310492945.9A CN202310492945A CN116696277A CN 116696277 A CN116696277 A CN 116696277A CN 202310492945 A CN202310492945 A CN 202310492945A CN 116696277 A CN116696277 A CN 116696277A
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- cylinder
- connecting rod
- main body
- fixed
- gas
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- 238000007789 sealing Methods 0.000 title claims abstract description 55
- 238000000605 extraction Methods 0.000 title claims abstract description 34
- 238000005553 drilling Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims description 14
- 239000002002 slurry Substances 0.000 claims abstract description 31
- 238000002156 mixing Methods 0.000 claims abstract description 12
- 239000004568 cement Substances 0.000 claims description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 27
- 229920001971 elastomer Polymers 0.000 claims description 20
- 238000005192 partition Methods 0.000 claims description 17
- 238000003860 storage Methods 0.000 claims description 11
- 230000000694 effects Effects 0.000 claims description 9
- 238000000926 separation method Methods 0.000 claims description 8
- 239000003245 coal Substances 0.000 claims description 4
- 238000001125 extrusion Methods 0.000 claims description 3
- 238000007711 solidification Methods 0.000 claims description 3
- 230000008023 solidification Effects 0.000 claims description 3
- 239000011083 cement mortar Substances 0.000 description 4
- 239000002775 capsule Substances 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000011268 mixed slurry Substances 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- 238000009987 spinning Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001595 contractor effect Effects 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
-
- 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
Landscapes
- 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)
- Pipe Accessories (AREA)
Abstract
The invention discloses a gas extraction drilling secondary hole sealing device, which comprises: the main body cylinder is provided with fastening threads on the outer wall of the circumference, and can be screwed into the gas drilling hole; the connecting rod is coaxially arranged in the main body cylinder in a sliding manner, and one end of the connecting rod is fixedly provided with a connecting plate; the slurry mixing filling assembly is sleeved on one side, far away from the main body cylinder, of the connecting rod; and the air bag hole sealing mechanism is arranged on the connecting rod and is positioned between the slurry mixing and filling assembly and the main body cylinder.
Description
Technical Field
The invention belongs to the technical field of coal mine drilling hole sealing equipment, and particularly relates to a secondary hole sealing device and method for a gas extraction drilling hole.
Background
At present, main modes of mine gas control include protection layer exploitation, air exhaust, gas extraction and the like, wherein the gas extraction is the most effective way for controlling the gas, and the hole sealing quality of extraction drilling holes directly influences the mine gas extraction effect and whether the control meets production requirements. The hole sealing is not tight, the extraction effect is poor, the concentration is low, gas is released into a roadway, the underground operation environment is damaged, and the life safety of operators is threatened. In the prior art, the common plugging mode of the extraction hole adopts polyurethane, cement mortar hole sealing or expansion capsule mechanical hole sealing, wherein the polyurethane is easy to foam, the hole sealing efficiency is high, but the problems of inaccurate plugging, easy blocking of a grouting pipe and the like are easy to occur when the cement mortar is plugged, gas is continuously leaked in the process of grouting into the hole, before the cement mortar is dried and solidified, a certain gap is flushed in the filled cement mortar by gas in the hole, so that the gas is leaked, the plugging effect is poor and the like, and the expansion capsule mechanical plugging device can slowly loosen and leak along with the shrinkage of a capsule under the pushing of pressure; therefore, a person skilled in the art provides a device and a method for secondary hole sealing of a gas extraction borehole, so as to solve the problems in the background art.
Disclosure of Invention
In order to achieve the above purpose, the present invention provides the following technical solutions: the gas drainage drilling secondary hole sealing device comprises:
the main body cylinder is provided with fastening threads on the outer wall of the circumference, and can be screwed into the gas drilling hole;
the connecting rod is coaxially arranged in the main body cylinder in a sliding manner, and one end of the connecting rod is fixedly provided with a connecting plate;
the slurry mixing filling assembly is sleeved on one side, far away from the main body cylinder, of the connecting rod; and
the air bag hole sealing mechanism is arranged on the connecting rod and is positioned between the slurry mixing and filling assembly and the main body cylinder.
Further, as the preference, a plurality of air guide grooves are symmetrically formed in the circumferential side wall of the main body cylinder, a cover plate is fixedly embedded in the air guide grooves, a plurality of air inlets are formed in the cover plate, a guide sleeve is arranged in one side of the main body cylinder in an embedded mode, a sliding cylinder is axially arranged in the guide sleeve in a sliding mode, the cross section of the sliding cylinder and the cross section of the guide sleeve are of polygonal structures, air holes are formed in the sliding cylinder, one end of the connecting rod is fixed with the sliding cylinder, one side of the sliding cylinder is connected with a fixing spring, and one end of the fixing spring is connected with the main body cylinder.
Further, preferably, the slurry filling assembly includes:
the connecting plate is fixed at one end of the connecting rod;
one end of the elastic sleeve is sleeved and fixed on the connecting plate;
the baffle is fixedly arranged in the middle of the elastic sleeve and is in sliding connection with the connecting rod, the baffle divides the elastic sleeve into two cavities left and right, the cavity positioned at the opposite left side is a water storage cavity, and the other cavity is a cement cavity; the other end of the elastic sleeve is fixed with an intermediate plate;
the fixed pipes are symmetrically distributed on the partition board, each fixed pipe transversely penetrates through the partition board, and a plurality of through holes are formed in one side, located in the cement cavity, of each fixed pipe;
an inner cylinder embedded and fixed on the middle plate;
the first rubber sleeve is sleeved outside the connecting rod and is positioned between the connecting plate and the partition plate;
the second rubber sleeve is sleeved outside the connecting rod and is positioned between the partition plate and the middle plate.
Further, preferably, water is stored in the water storage cavity, cement is stored in the cement cavity, a plurality of micropores are formed in one side, close to the middle plate, of the elastic sleeve at the cement cavity, and a separation sheet is further arranged in each fixing pipe.
Further, as preferable, the inner shaft cylinder is sleeved with a shaft tube, a rotary pressing plate is mounted on the shaft tube, a spiral guide groove is formed in the circumferential side wall of the shaft tube, a shaft pin is fixed on the inner shaft cylinder and is arranged in the spiral guide groove in a sliding mode, a top plate is further fixed on the connecting rod, and the top plate drives the shaft tube to synchronously deflect under the axial pushing of the shaft tube through the shaft pin.
Further, preferably, the airbag sealing mechanism includes:
the outer shaft seat is fixed on one side of an inner shaft cylinder in the slurry mixing and filling assembly, the connecting rod is connected with the outer shaft seat in a sliding manner, and a sealing sleeve is arranged between the connecting rod and the outer shaft seat;
the shaft plug is sleeved and fixed on the connecting rod and is in sliding connection with the inner shaft cylinder;
the oblique flow holes are all arranged on the outer shaft seat;
the air flow guide pieces are circumferentially distributed on the outer shaft seat and are correspondingly communicated with the inclined flow holes; and
the annular air pressure bag is sleeved outside the outer shaft seat and is communicated with the air flow guide piece.
Further, preferably, the cross section of the annular air pressure bag is in an L-shaped structure.
Further, as a preferable hole sealing method of the gas extraction borehole secondary hole sealing device, it is characterized in that: the method comprises the following steps:
step 1: the main body is installed, the elastic sleeve is pushed into the gas extraction drilling hole in the hole sealing of the constructed gas extraction drilling hole, and the sliding cylinder is rotated through the polygonal wrench, so that the main body cylinder can be screwed into the gas extraction drilling hole in a threaded manner, and at the moment, the main body cylinder achieves the hole sealing effect on the gas extraction drilling hole of a coal mine;
step 2: the hole sealing of the air bag is carried out, the concentration of gas in the drill hole is continuously increased along with the time, the gas flows into the main body cylinder through the gas guide groove, then the gas flows into the sliding cylinder through a plurality of air holes on the sliding cylinder, the pressure in the sliding cylinder is increased, the gas axially slides relative to the main body cylinder, the fixed spring stretches, the connecting rod synchronously displaces along with the gas, and the shaft plug pushes the gas flow in the inner shaft cylinder into the annular gas pressure bag, so that the annular gas pressure bag is fully contacted with the inner wall of the drill hole;
step 3: the cement is plugged, the pressure intensity in the sliding cylinder is still continuously increased, the elastic sleeve is extruded and expanded when the connecting rod axially slides, the first rubber sleeve and the second rubber sleeve are respectively extruded and compressed, meanwhile, water in the water storage cavity is extruded and impacted to the separation sheet in the fixed pipe and is broken, the water flows into the cement cavity through the through hole, the water and the cement are mixed to form slurry, and the elastic sleeve is tightly attached to the inner wall of the drill hole under expansion;
step 4: and (3) flow solidification, wherein a small part of the slurry can overflow to the outside of the elastic sleeve through the micropores under the extrusion of the spinning disk, and the slurry fully seals the contact edge of the annular air pressure bag and the inner wall of the drill hole.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, after the mechanical hole sealing can be carried out on the drill hole through the main body cylinder, the drill hole can be automatically plugged for the second time along with the increase of gas, so that the plugging effect is better; the main slurry mixing and filling assembly and the air bag hole sealing mechanism can be used for carrying out solidification hole sealing by the mixed slurry of water and cement on one hand, and can be used for carrying out hole sealing again by matching the annular air pressure bag with the mixed slurry on the other hand, so that the plugging effect is obvious.
Drawings
FIG. 1 is a schematic diagram of a first embodiment of the present invention;
FIG. 2 is a schematic diagram of a second embodiment of the present invention;
FIG. 3 is a schematic view of a sliding cylinder according to the present invention;
FIG. 4 is a schematic view of a slurry filling assembly according to the present invention;
FIG. 5 is a schematic view of the structure of a rotary platen according to the present invention;
FIG. 6 is a schematic view showing the structure of the middle shaft tube according to the present invention;
FIG. 7 is a schematic view of the air bag sealing mechanism according to the present invention;
in the figure: 1. a main body cylinder; 11. a connecting plate; 12. a connecting rod; 13. an air guide groove; 14. a sliding cylinder; 15. a guide sleeve; 16. a cover plate; 17. a fixed spring; 2. an air bag hole sealing mechanism; 21. an outer shaft seat; 22. a shaft plug; 23. an airflow guide; 24. an annular air pressure bag; 3. a slurry filling assembly; 31. an elastic sleeve; 32. a partition plate; 33. a first rubber sleeve; 34. a second rubber sleeve; 35. an intermediate plate; 36. an inner cylinder; 37. a fixed tube; 38. a separator sheet; 4. a shaft tube; 41. a spinning disk; 42. a shaft pin; 43. and a top plate.
Detailed Description
Referring to fig. 1, in an embodiment of the present invention, a secondary hole sealing device for a gas extraction drill hole includes:
the main body cylinder 1 is provided with fastening threads on the outer wall of the circumference, and the main body cylinder 1 can be screwed into a gas drilling hole;
the connecting rod 12 is coaxially arranged in the main body cylinder 1 in a sliding manner, and a connecting plate is fixed at one end of the connecting rod 12;
the slurry mixing filling assembly 3 is sleeved on one side, far away from the main body barrel 1, of the connecting rod 12; and
the air bag hole sealing mechanism 2 is arranged on the connecting rod 12 and is positioned between the slurry mixing and filling assembly 3 and the main body cylinder 1.
In this embodiment, a plurality of air guide grooves 13 are symmetrically formed in the circumferential side wall of the main body cylinder 1, a cover plate 16 is fixedly embedded in the air guide grooves 13, a plurality of air inlet holes are formed in the cover plate 16, a guide sleeve 15 is arranged in one side of the main body cylinder 1 in an embedded manner, a sliding cylinder 14 is axially arranged in the guide sleeve 15 in a sliding manner, the cross sections of the sliding cylinder 14 and the guide sleeve 15 are of polygonal structures, air holes are formed in the sliding cylinder, the sliding cylinder cannot rotate relative to the main body cylinder, one end of the connecting rod 12 is fixed with the sliding cylinder 14, one side of the sliding cylinder 14 is connected with a fixing spring 17, one end of the fixing spring 17 is connected with the main body cylinder 2, that is, when the main body cylinder is screwed into a gas extraction drill hole in a threaded manner, so that a mechanical hole sealing effect is achieved, and as time passes, the concentration of gas increases, and enters the main body cylinder through the cover plate on the air guide grooves, and then enters the sliding cylinder through the air holes on the sliding cylinder, so that the sliding cylinder axially slides.
As a preferred embodiment, the slurry filling assembly 3 comprises:
a connecting plate 11 fixed at one end of the connecting rod 12;
an elastic sleeve 31, one end of which is sleeved and fixed on the connecting plate 11; the elastic expansion and contraction effect is high;
the partition plate 32 is fixedly arranged in the middle of the elastic sleeve 31 and is in sliding connection with the connecting rod 12, the partition plate 32 divides the elastic sleeve 31 into two cavities left and right, the cavity positioned on the opposite left side is a water storage cavity, and the other cavity is a cement cavity; the other end of the elastic sleeve is fixed with an intermediate plate 35;
the fixed pipes 37 are symmetrically distributed on the partition plate 32, each fixed pipe 37 transversely penetrates through the partition plate 32, and a plurality of through holes are formed in one side, located in the cement cavity, of the fixed pipe 37;
an inner cylinder 36 embedded and fixed on the intermediate plate 35;
the first rubber sleeve 33 is sleeved outside the connecting rod 12 and is positioned between the connecting plate 12 and the partition plate 32;
the second rubber sleeve 34 is sleeved outside the connecting rod 12 and is positioned between the partition plate 32 and the middle plate 35, the elastic sleeve is gradually compressed in the axial sliding process of the connecting rod, and simultaneously the first rubber sleeve and the second rubber sleeve are synchronously compressed, wherein the supporting strength of the second rubber sleeve is greater than that of the first rubber sleeve, so that the first rubber sleeve is elastically deformed better than that of the second rubber sleeve, and the pressure in the water storage cavity is preferentially increased continuously.
In this embodiment, the water is stored in the water storage cavity, cement is stored in the cement cavity, a plurality of micropores are formed on one side, close to the middle plate 35, of the elastic sleeve 31 at the cement cavity, and a separation sheet 38 is further disposed in each fixing tube 37, wherein when the pressure in the water storage cavity increases, the water impacts and extrudes the separation sheet, and the separation sheet can be broken through, so that the water can flow into the cement cavity to form slurry.
In this embodiment, the shaft tube 4 is sleeved outside the inner shaft cylinder 36, the rotary disc 41 is installed on the shaft tube 4, the circumferential side wall of the shaft tube 4 is provided with a spiral guide groove, the inner shaft cylinder 36 is fixed with the shaft pin 42, the shaft pin 42 is slidably disposed in the spiral guide groove, the connecting rod 12 is further fixed with the top disc 43, the top disc 43 drives the shaft tube 4 to synchronously deflect through the shaft pin 42 under the axial pushing of the shaft tube 4, in particular, after water and cement are mixed to form slurry, the connecting rod can push the shaft tube to slide through the top disc under the axial sliding, and the shaft tube deflects in the sliding process, so that the rotary disc can circumferentially compress the slurry, and at least part of the slurry can overflow out of the elastic sleeve through micropores and is in contact with the air bag sealing mechanism, thereby realizing the gap blocking effect on the air bag sealing mechanism.
In this embodiment, the air bag sealing mechanism 2 includes:
an outer shaft seat 21 fixed on one side of an inner shaft cylinder 36 in the slurry filling assembly 3, wherein the connecting rod 12 is in sliding connection with the outer shaft seat 21, and a sealing sleeve is arranged between the connecting rod and the outer shaft seat 21;
the shaft plug 22 is sleeved and fixed on the connecting rod 12, and the shaft plug 22 is in sliding connection with the inner shaft cylinder 36;
the oblique flow holes are all arranged on the outer shaft seat 21;
the air flow guide pieces 23 are circumferentially distributed on the outer shaft seat 21, and the air flow guide pieces 23 are correspondingly communicated with the inclined flow holes; and
an annular air pressure bag 24 is sleeved outside the outer shaft seat 21 and is communicated with the air flow guide piece 23.
As a preferred embodiment, the cross section of the annular air pressure bag 24 is L-shaped, and the annular air pressure bag can be contacted with the inner wall of the drill hole before the slurry mixing and filling assembly.
In this embodiment, the hole sealing method of the gas extraction drilling secondary hole sealing device includes the following steps:
step 1: the main body is installed, the elastic sleeve 31 is pushed into the gas extraction drilling hole in the hole sealing process of the constructed gas extraction drilling hole, the sliding cylinder 14 is rotated through the polygonal wrench, so that the main body cylinder 1 can be screwed into the gas extraction drilling hole, and at the moment, the main body cylinder 1 achieves the hole sealing effect on the coal mine gas extraction drilling hole;
step 2: the hole sealing of the air bag, the gas concentration in the drill hole is continuously increased along with the time, the gas continuously flows into the main body cylinder 1 through the gas guide groove 13, then the gas enters the sliding cylinder 14 through a plurality of air holes on the sliding cylinder 14, the pressure in the sliding cylinder 14 is increased, the gas axially slides relative to the main body cylinder 1, the fixed spring 17 stretches, the connecting rod 12 synchronously displaces along with the hole sealing, and the shaft plug 22 pushes the gas flow in the inner shaft cylinder 36 into the annular gas pressure bag 24, so that the annular gas pressure bag 24 is fully contacted with the inner wall of the drill hole;
step 3: the cement is plugged, the pressure in the sliding cylinder 14 is still continuously increased, the elastic sleeve 31 is extruded and expanded when the connecting rod 12 axially slides, the first rubber sleeve 33 and the second rubber sleeve 34 are respectively extruded and compressed, meanwhile, the water in the water storage cavity is extruded and impacted on the separation sheet 38 in the fixed pipe and is broken, the water flows into the cement cavity through the through hole, the water and the cement are mixed to form slurry, and the elastic sleeve 31 is tightly attached to the inner wall of the drilling hole under expansion;
step 4: the flow solidifies, and a small portion of the slurry can overflow to the outside of the elastic sleeve 31 through the micropores under the extrusion of the rotary disc 41, and at this time, the slurry fully seals the contact edge between the annular air pressure bag 24 and the inner wall of the borehole.
The foregoing description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical solution of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (8)
1. The secondary hole sealing device for the gas extraction drilling hole is characterized in that: it comprises the following steps:
the main body cylinder (1) is provided with fastening threads on the outer wall of the circumference, and the main body cylinder (1) can be screwed into the gas drilling hole;
the connecting rod (12) is coaxially arranged in the main body cylinder (1) in a sliding manner, and a connecting plate is fixed at one end of the connecting rod (12);
the slurry mixing filling assembly (3) is sleeved on one side, far away from the main body cylinder (1), of the connecting rod (12); and
the air bag hole sealing mechanism (2) is arranged on the connecting rod (12) and is positioned between the slurry mixing and filling assembly (3) and the main body cylinder (1).
2. The gas extraction borehole secondary sealing device according to claim 1, wherein: a plurality of air guide grooves (13) are symmetrically formed in the circumferential side wall of the main body cylinder (1), a cover plate (16) is fixedly embedded in the air guide grooves (13), a plurality of air inlets are formed in the cover plate (16), a guide sleeve (15) is arranged on one side of the main body cylinder (1) in an embedded mode, a sliding cylinder (14) is arranged in the guide sleeve (15) in an axial sliding mode, the cross section of the sliding cylinder (14) and the cross section of the guide sleeve (15) are of polygonal structures, air holes are formed in the sliding cylinder (14), one end of the connecting rod (12) is fixed with the sliding cylinder (14), a fixing spring (17) is connected to one side of the sliding cylinder (14), and one end of the fixing spring (17) is connected with the main body cylinder (2).
3. The gas extraction borehole secondary sealing device according to claim 1, wherein: the slurry filling assembly (3) comprises:
the connecting plate (11) is fixed at one end of the connecting rod (12);
one end of the elastic sleeve (31) is sleeved and fixed on the connecting plate (11);
the partition plate (32) is fixedly arranged in the middle of the elastic sleeve (31) and is in sliding connection with the connecting rod (12), the partition plate (32) divides the elastic sleeve (31) into two cavities left and right, the cavity positioned on the left side opposite to the elastic sleeve is a water storage cavity, and the other cavity is a cement cavity; the other end of the elastic sleeve is fixed with an intermediate plate (35);
the fixed pipes (37) are symmetrically distributed on the partition board (32), each fixed pipe (37) transversely penetrates through the partition board (32), and a plurality of through holes are formed in one side, located in the cement cavity, of each fixed pipe (37);
an inner cylinder (36) embedded and fixed on the middle plate (35);
the first rubber sleeve (33) is sleeved outside the connecting rod (12) and is positioned between the connecting plate (12) and the partition plate (32);
the second rubber sleeve (34) is sleeved outside the connecting rod (12) and is positioned between the partition plate (32) and the middle plate (35).
4. The gas extraction borehole secondary sealing device according to claim 3, wherein: the water storage cavity is internally provided with water, the cement cavity is internally provided with cement, one side, close to the middle plate (35), of the elastic sleeve (31) at the cement cavity is provided with a plurality of micropores, and each fixing pipe (37) is internally provided with a separation sheet (38).
5. The gas extraction borehole secondary sealing device according to claim 3, wherein: the novel rotary shaft tube is characterized in that the shaft tube (4) is sleeved outside the inner shaft cylinder (36), the rotary disc (41) is mounted on the shaft tube (4), a spiral guide groove is formed in the circumferential side wall of the shaft tube (4), the shaft pin (42) is fixed on the inner shaft cylinder (36), the shaft pin (42) is slidably arranged in the spiral guide groove, the top disc (43) is further fixed on the connecting rod (12), and the top disc (43) drives the shaft tube (4) to synchronously deflect through the shaft pin (42) under the axial pushing of the shaft tube (4).
6. The gas extraction borehole secondary sealing device according to claim 1, wherein: the airbag hole sealing mechanism (2) comprises:
an outer shaft seat (21) is fixed on one side of an inner shaft cylinder (36) in the slurry mixing and filling assembly (3), the connecting rod (12) is in sliding connection with the outer shaft seat (21), and a sealing sleeve is arranged between the connecting rod and the outer shaft seat;
the shaft plug (22) is sleeved and fixed on the connecting rod (12), and the shaft plug (22) is in sliding connection with the inner shaft cylinder (36);
the oblique flow holes are all arranged on the outer shaft seat (21);
the air flow guide pieces (23) are circumferentially distributed on the outer shaft seat (21), and the air flow guide pieces (23) are correspondingly communicated with the inclined flow holes; and
and the annular air pressure bag (24) is sleeved outside the outer shaft seat (21) and is communicated with the air flow guide piece (23).
7. The gas drainage borehole secondary sealing device according to claim 6, wherein: the cross section of the annular air pressure bag (24) is of an L-shaped structure.
8. The hole sealing method of the gas extraction drilling secondary hole sealing device according to any one of claims 1 to 7, characterized by comprising the following steps: the method comprises the following steps:
step 1: the main body is installed, the elastic sleeve (31) is pushed into the gas extraction drilling hole in the hole sealing process of the constructed gas extraction drilling hole, the sliding cylinder (14) is rotated through the polygonal wrench, so that the main body cylinder (1) can be screwed into the gas extraction drilling hole, and at the moment, the main body cylinder (1) achieves the hole sealing effect on the coal mine gas extraction drilling hole;
step 2: the hole sealing of the air bag is carried out, the concentration of gas in the drill hole is continuously increased along with the time, the gas flows into the main body cylinder (1) through the gas guide groove (13), then the gas enters the sliding cylinder (14) through a plurality of air holes on the sliding cylinder (14), the pressure in the sliding cylinder (14) is increased, the gas axially slides relative to the main body cylinder (1), the fixed spring (17) is stretched, the connecting rod (12) synchronously displaces along with the axial sliding, and the shaft plug (22) pushes the air flow in the inner shaft cylinder (36) into the annular air pressure bag (24) so that the annular air pressure bag (24) is fully contacted with the inner wall of the drill hole;
step 3: the cement is plugged, the pressure in the sliding cylinder (14) is still continuously increased, the elastic sleeve (31) is extruded and expanded when the connecting rod (12) axially slides, the first rubber sleeve (33) and the second rubber sleeve (34) are respectively extruded and compressed, meanwhile, water in the water storage cavity is extruded and impacted on the separation sheet (38) in the fixed pipe and is broken, the water flows into the cement cavity through the through hole, the water and the cement are mixed to form slurry, and the elastic sleeve (31) is tightly attached to the inner wall of the drill hole under expansion;
step 4: and (3) flow solidification, wherein a small part of the slurry can overflow to the outside of the elastic sleeve (31) through micropores under the extrusion of the rotary disc (41), and the slurry fully seals the contact edge of the annular air pressure bag (24) and the inner wall of the drill hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310492945.9A CN116696277A (en) | 2023-05-05 | 2023-05-05 | Gas extraction drilling secondary hole sealing device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310492945.9A CN116696277A (en) | 2023-05-05 | 2023-05-05 | Gas extraction drilling secondary hole sealing device and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116696277A true CN116696277A (en) | 2023-09-05 |
Family
ID=87840042
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310492945.9A Pending CN116696277A (en) | 2023-05-05 | 2023-05-05 | Gas extraction drilling secondary hole sealing device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116696277A (en) |
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2023
- 2023-05-05 CN CN202310492945.9A patent/CN116696277A/en active Pending
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