CN113431623A - High-gas weak coal seam extraction system and method - Google Patents
High-gas weak coal seam extraction system and method Download PDFInfo
- Publication number
- CN113431623A CN113431623A CN202110854208.XA CN202110854208A CN113431623A CN 113431623 A CN113431623 A CN 113431623A CN 202110854208 A CN202110854208 A CN 202110854208A CN 113431623 A CN113431623 A CN 113431623A
- Authority
- CN
- China
- Prior art keywords
- extraction
- gas
- coal seam
- hole
- sliding sleeve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000605 extraction Methods 0.000 title claims abstract description 192
- 239000003245 coal Substances 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000001125 extrusion Methods 0.000 claims description 36
- 239000011435 rock Substances 0.000 claims description 35
- 239000007788 liquid Substances 0.000 claims description 24
- 238000005086 pumping Methods 0.000 claims description 21
- 238000007789 sealing Methods 0.000 claims description 18
- 238000005553 drilling Methods 0.000 claims description 12
- 239000002002 slurry Substances 0.000 claims description 9
- 230000007246 mechanism Effects 0.000 claims description 8
- 239000002775 capsule Substances 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 238000005336 cracking Methods 0.000 claims 1
- 239000002245 particle Substances 0.000 description 10
- 230000009471 action Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 230000035699 permeability Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000005422 blasting Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000011440 grout Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000007569 slipcasting Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000000518 rheometry Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- E21B33/126—Packers; Plugs with fluid-pressure-operated elastic cup or skirt
-
- 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
- E21B33/127—Packers; Plugs with inflatable sleeve
-
- 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/263—Methods for stimulating production by forming crevices or fractures using explosives
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/70—Combining sequestration of CO2 and exploitation of hydrocarbons by injecting CO2 or carbonated water in oil wells
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)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention discloses a high-gas weak coal seam extraction system and method, and aims to ensure the smoothness of an extraction pipeline in a gas extraction process and improve the extraction efficiency. Therefore, the high-gas soft coal seam extraction system provided by the embodiment of the invention comprises a gas extraction pipe, a hole packer arranged on the gas extraction pipe, a telescopic net bag sleeved outside the gas extraction pipe, a sliding sleeve slidably mounted on the gas extraction pipe, a support framework with two ends hinged to the sliding sleeve and the telescopic net bag, a linear driving piece arranged on the gas extraction pipe and used for driving the sliding sleeve to slide, and an elastic element arranged between the sliding sleeve and the linear driving piece, wherein after the gas extraction pipe and the telescopic net bag are inserted into an extraction drill hole in a coal seam, when the linear driving piece drives the sliding sleeve to move to a spreading position, the support framework is spread to spread the telescopic net bag and abuts against the wall surface of the extraction drill hole.
Description
Technical Field
The invention belongs to the technical field of coal seam extraction, and particularly relates to a high-gas weak coal seam extraction system and method.
Background
Coal seam gas extraction is the most direct and effective means for eliminating coal seam outburst danger, and when coal seam drilling extraction is carried out, two measures are mainly adopted for improving the coal seam gas extraction rate: firstly, the number of extraction drill holes is increased, drilling parameters are optimized, and secondly, auxiliary measures are adopted to improve the permeability of the coal bed. However, the high-gas soft coal seam is relatively soft and granular and has the characteristic of creep deformation and rheology under the action of load, so that the problems of hole collapse, drill hole stripping, large deformation of the drill hole and the like are easily caused under the action of negative pressure during gas extraction, the accidents of extraction pipeline blockage, extraction negative pressure reduction and the like are caused, and the extraction efficiency is reduced.
Disclosure of Invention
The invention mainly aims to provide a high-gas weak coal seam extraction system and method, aiming at ensuring the smoothness of an extraction pipeline in the gas extraction process and improving the extraction efficiency.
Therefore, the high-gas weak coal seam extraction system provided by the embodiment of the invention comprises the following components:
the tail end of the gas extraction pipe is connected with an extraction pump;
the hole packer is arranged on the gas extraction pipe and used for sealing the hole opening of the extraction drill hole;
the telescopic net bag is sleeved outside the gas extraction pipe and is cylindrical;
the sliding sleeve is slidably mounted on the gas extraction pipe;
one end of the supporting framework is hinged with the sliding sleeve, and the other end of the supporting framework is hinged with the telescopic net bag;
the linear driving piece is arranged on the gas extraction pipe and used for driving the sliding sleeve to slide;
the elastic element is arranged between the sliding sleeve and the linear driving piece;
after the gas extraction pipe and the telescopic net bag are inserted into an extraction drill hole in a coal seam, when the linear driving piece drives the sliding sleeve to move to the unfolding position, the supporting framework is unfolded to unfold the telescopic net bag and abuts against the wall surface of the extraction drill hole.
Specifically, the hole packer includes:
the flexible grouting bag body is sleeved on the gas extraction pipe, and a grouting hole is formed in the outer wall of the flexible grouting bag body;
the grouting pump is communicated with the inner cavity of the flexible grouting bag body through a grouting pipe;
and after the grouting pump injects sealing slurry into the flexible grouting bag body, the flexible grouting bag body is forced to expand so as to be tightly attached to the gas extraction pipe and the extraction drill hole.
Specifically, the hole packer further comprises an automatic extrusion module, wherein the automatic extrusion module is arranged on the gas extraction pipe and used for forcing the flexible grouting bag body to expand;
the automatic extrusion module comprises two extrusion sleeves which can approach or depart from each other;
the two extrusion sleeves are respectively positioned on the front side and the rear side of the flexible grouting bag body, the extrusion sleeve positioned on the front side is fixedly connected with the gas extraction pipe, and the extrusion sleeve positioned on the rear side is in threaded connection with the gas extraction pipe.
Specifically, the both ends of the inner chamber wall of flexible slip casting utricule are equipped with the extrusion conical surface, the extrusion cover towards one end of flexible slip casting utricule is equipped with and corresponds the cooperation conical surface of extrusion conical surface matched with.
Specifically, the supporting framework follows the axial interval of sliding sleeve sets up a plurality ofly, every the supporting framework includes the edge many connecting rods that the circumference of sliding sleeve evenly arranged, every the one end of connecting rod with the sliding sleeve is articulated, the other end outwards extend forward with telescopic string bag is articulated.
Specifically, the elastic element is a spiral spring sleeved on the gas extraction pipe.
Specifically, the linear driving member is a pushing nut which is sleeved outside the gas extraction pipe and is in threaded connection with the gas extraction pipe.
Specifically, the coal seam is also provided with an increase and extraction guide hole, the extraction drill holes are uniformly distributed around the increase and extraction guide hole by taking the increase and extraction guide hole as a center, a loading mechanism for applying dynamic disturbance to the coal seam around the increase and extraction guide hole to enable the coal seam to generate cracks is arranged in the increase and extraction guide hole, and the extraction range of the gas extraction pipe is partially overlapped with the fracturing range of the increase and extraction guide hole.
Specifically, the loading mechanism comprises a liquid CO2 phase changer, and the liquid CO2 phase changer is used for gasifying liquid CO2 into high-pressure CO2 gas and discharging the gas to the wall surface of the pumping guide hole directionally through a discharge port.
Specifically, a plurality of energy discharge ports are uniformly arranged on the liquid CO2 phase changer along the circumferential direction of the pumping increasing guide hole, and each energy discharge port is aligned with one pumping drill hole.
In another aspect of the embodiment of the invention, the method for extracting the high gas soft and weak coal seam, which is provided by the invention, by using the high gas soft and weak coal seam extraction system, comprises the following steps:
and 5, starting the extraction pump to extract gas.
Compared with the prior art, at least one embodiment of the invention has the following beneficial effects: the gas extraction pipe is provided with a telescopic string bag for supporting the extraction drill hole, so that the smoothness of the extraction drill hole is ensured, when the stress of surrounding rocks of the extraction drill hole is large, the telescopic string bag can be contracted under the action of pressure, the surrounding rocks around the extraction drill hole are loosened, the high stress is released, the pressure yielding effect is exerted, the pressure of the surrounding rocks around the extraction drill hole is relieved, the coal bed particles of the surrounding rocks around the extraction drill hole become loose, the smoothness of a coal bed extraction crack is ensured, and the gas extraction rate is ensured.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic layout diagram of a high-gas weak coal seam extraction system provided by an embodiment of the invention;
FIG. 2 is a schematic structural diagram of a gas extraction assembly provided by an embodiment of the invention;
FIG. 3 is a sectional view taken along line A-A of FIG. 1;
FIG. 4 is a schematic structural diagram of a loading mechanism provided in an embodiment of the present invention;
wherein: 1. a gas extraction pipe; 2. a hole packer; 201. a flexible grouting capsule; 202. a grouting pipe; 203. grouting pump; 204. grouting holes; 205. extruding a sleeve; 206. a matching conical surface; 3. a telescopic string bag; 4. a sliding sleeve; 5. a support framework; 501. a connecting rod; 6. a linear drive; 7. an elastic element; 8. an extraction pump; 9. extracting and drilling; 10. increasing the pumping guide hole; 11. a liquid CO2 phase changer; 12. an energy discharge port; 13. a heating element.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Referring to fig. 1 and 2, a high-gas weak coal seam extraction system comprises a gas extraction assembly, the gas extraction component comprises a gas extraction pipe 1, a hole packer 2, a telescopic string bag 3, a sliding sleeve 4, a supporting framework 5, a linear driving piece 6 and an elastic element 7, wherein the tail end of the gas extraction pipe 1 is connected with an extraction pump 8, the hole packer 2 is arranged on the gas extraction pipe 1, used for sealing the orifice of the extraction drill hole 9, the telescopic net bag 3 is sleeved outside the gas extraction pipe 1 in a cylindrical shape, the aperture of the telescopic net bag 3 is smaller than the particle size of coal rock particles, the sliding sleeve 4 is slidably arranged on the gas extraction pipe 1, one end of the supporting framework 5 is hinged with the sliding sleeve 4, the other end of the supporting framework is hinged with the telescopic net bag 3, the linear driving piece 6 is arranged on the gas extraction pipe 1, used for driving the sliding sleeve 4 to slide on the gas extraction pipe 1, and the elastic element 7 is arranged between the sliding sleeve 4 and the linear driving piece 6.
The specific process of extracting the high-gas soft coal seam by using the extraction system is as follows:
and 5, starting the extraction pump 8 to extract gas, and when the stress of the surrounding rock of the drill hole is large, radially contracting the telescopic string bag 3 to release high stress, exerting the function of yielding, and relieving the pressure of the surrounding rock of the drill hole.
In the embodiment, the telescopic net bag 3 for supporting the extraction drill hole 9 is arranged on the gas extraction pipe 1, so that the smoothness of the extraction drill hole 9 is ensured, when the stress of surrounding rocks of the extraction drill hole 9 is large, the telescopic net bag 3 can be contracted under the action of pressure, the surrounding rocks around the extraction drill hole 9 are loosened, the high stress is released, the pressure yielding effect is exerted, the pressure of the surrounding rocks around the extraction drill hole 9 is relieved, the surrounding rock coal seam particles around the extraction drill hole 9 become loose, so that the smoothness of a coal seam extraction crack is ensured, and the gas extraction rate is ensured.
Referring to fig. 3, in some embodiments, the coal seam may further be provided with a pumping increase guide hole 10, the pumping drill holes 9 are uniformly distributed around the pumping increase guide hole 10 with the pumping increase guide hole 10 as a center, a loading mechanism for applying dynamic disturbance to the coal seam around the pumping increase guide hole is arranged in the pumping increase guide hole 10 to enable the coal seam to generate cracks, and the pumping range of the gas pumping pipe 1 is partially overlapped with the fracturing range of the pumping increase guide hole 10. By the design mode, dynamic disturbance can be applied to the surrounding rock by the loading mechanism, and the surrounding rock can generate cracks parallel to the dynamic loading direction under the condition of the dynamic disturbance, so that the directional damage of the surrounding rock is enhanced, and the purpose of increasing the extraction of the extraction drill hole 9 can be achieved. As for the number and the size of the extraction boreholes 9, a person skilled in the art can determine the permeability of a specific coal seam by only ensuring that the extraction ranges of two adjacent extraction boreholes 9 are partially overlapped.
Referring to fig. 3 and 4, in particular, the loading mechanism comprises a liquid CO2 phase converter 11, the liquid CO2 phase converter 11 is used for gasifying liquid CO2 into high-pressure CO2 gas and discharging the gas in a directional mode to the wall surface of the pumping enhancement guide hole 10 through the energy discharge ports 12, the energy discharge ports 12 are uniformly arranged on the liquid CO2 phase converter 11 along the circumferential direction of the pumping enhancement guide hole 10, and each energy discharge port 12 is aligned with one extraction drill hole 9.
In the embodiment, during extraction, the liquid CO2 phase changer 11 is installed in the extraction increasing guide hole 10, the extraction increasing guide hole 10 is blocked, then the extraction pump 8 is started to extract gas, when the gas extraction concentration is low, the liquid CO2 phase changer 11 is started, the liquid CO2 in the liquid CO2 phase changer 11 is heated by the heating element 13, the liquid CO2 is heated and gasified into high-pressure CO2 gas and is sprayed out from the energy release port 12, phase change blasting is performed on surrounding rocks, and directional fractures are generated, so that the extraction range of the extraction drill hole 9 is expanded, and directional extraction increasing of the extraction drill hole 9 is achieved.
Referring to fig. 1 and 2, in other embodiments, the hole packer 2 comprises a flexible grouting bag 201, a grouting pipe 202 and a grouting pump 203, the grouting pump 203 is communicated with an inner cavity of the flexible grouting bag 201 through the grouting pipe 202, the flexible grouting bag 201 is sleeved on the gas extraction pipe 1, a grouting hole 204 is formed in the outer wall of the flexible grouting bag 201, and after the grouting pump 203 injects sealing slurry into the flexible grouting bag 201, the flexible grouting bag 201 is forced to expand so as to be tightly attached to the gas extraction pipe 1 and the extraction borehole 9.
In the embodiment, sealing slurry is injected into the flexible grouting bag body 201 through the grouting pump 203, in the grouting process, the sealing slurry is full of the flexible grouting bag body 201 and forces the flexible grouting bag body 201 to expand, gaps between the extraction drill hole 9 and the flexible grouting bag body 201 and between the gas extraction pipe 1 and the flexible grouting bag body 201 are sealed, the sealing slurry enters surrounding rocks around the hole packer 2 through the grouting holes 204 along with the grouting, the surrounding rocks around the hole packer 2 are reinforced, the air permeability of the surrounding rocks in the area is reduced, the resistance of the sealing slurry penetrating into the surrounding rocks is gradually increased along with the further grouting, the flexible grouting bag body 201 is further expanded, the surrounding rocks around the hole packer 2 are further compressed and compacted, the air permeability of the surrounding rocks in the area is further reduced, and the extraction force can be further reduced.
Referring to fig. 1 and 2, it can be understood that the hole packer 2 further comprises an automatic extrusion module, which is arranged on the gas extraction pipe 1 and used for forcing the flexible grouting capsule 201 to expand, and comprises two extrusion sleeves 205 that can be close to or far away from each other; the two extrusion sleeves 205 are respectively positioned on the front side and the rear side of the flexible grouting bag body 201, the extrusion sleeve 205 positioned on the front side is fixedly connected with the gas extraction pipe 1, and the extrusion sleeve 205 positioned on the rear side is in threaded connection with the gas extraction pipe 1. After grouting is finished and sealing grout is initially set, the grouting valve is closed, the extrusion sleeve 205 on the rear side is screwed to push the extrusion sleeve 205 on the rear side towards the flexible grouting bag body 201, so that two ends of the flexible grouting bag body 201 are further extruded, the grout is forced to be fed and surrounding rocks are further extruded, and the sealing effect of the hole packer 2 is improved.
Referring to fig. 2, in other embodiments, two ends of the inner cavity wall of the flexible grouting bladder 201 are provided with extrusion conical surfaces, one end of the extrusion sleeve 205 facing the flexible grouting bladder 201 is provided with a matching conical surface 206 matching with the corresponding extrusion conical surface, and by providing the extrusion conical surfaces, the extrusion sleeve 205 is not only facilitated to be inserted into the flexible grouting bladder 201 and apply extrusion force to the flexible grouting bladder 201, but also the extrusion sleeve 205 is designed in such a way that the flexible grouting bladder 201 is less damaged.
Referring to fig. 2, it should be explained that, in a specific application, a plurality of support frameworks 5 are arranged at intervals along the axial direction of the sliding sleeve 4, each support framework 5 includes a plurality of connecting rods 501 uniformly arranged along the circumferential direction of the sliding sleeve 4, one end of each connecting rod 501 is hinged to the sliding sleeve 4, and the other end of each connecting rod 501 extends forwards and outwards to be hinged to the telescopic string bag 3, so that by adopting the design mode, each part of the telescopic string bag 3 can be effectively and uniformly unfolded and tightly attached to the wall surface of the extraction drill hole 9, even if the support frameworks 5 are folded, the telescopic string bag 3 can still be tightly attached to the wall surface of the extraction drill hole 9, support is provided for the extraction drill hole 9, and the basic form of the extraction drill hole 9 is kept unchanged.
In practical design, the elastic element 7 can be a coil spring sleeved on the gas extraction pipe 1, and the elastic element 7 can also be a rubber spring or other similar elastic elements 7. Secondly, in order to prevent the sliding sleeve 4 from sliding out of the front end of the gas extraction pipe 1, a baffle ring is arranged at the front end of the gas extraction pipe 1. In addition, in order to improve the extraction efficiency, an extraction port is arranged at the front end of the gas extraction pipe 1, extraction holes can be uniformly formed in the pipe wall of the gas extraction pipe 1, and through holes corresponding to the gas extraction holes need to be formed in the corresponding sliding sleeve 4.
In other embodiments, the linear driving member 6 is a pushing nut sleeved outside the gas extraction pipe 1, an external thread matched with the pushing nut is arranged outside the gas extraction pipe 1, the pushing nut is screwed to compress a coil spring to generate forward thrust, so that the supporting framework 5 is unfolded to support the telescopic string bag 3, when the stress of the drilling surrounding rock is large, the supporting framework 5 is retracted to further compress the coil spring, the telescopic string bag 3 is radially contracted, the purpose of 'yielding' is achieved, and the pressure of the drilling surrounding rock is relieved. Of course, the linear actuator 6 may be a hydraulic cylinder or a pneumatic cylinder, or other similar linear actuators 6.
Referring to fig. 1 to 4, the high gas soft and weak coal seam extraction system with the structure has the following working process:
firstly, drilling a pumping-increasing guide hole 10 on the wall surface of a roadway such as a coal seam, and then drilling a plurality of pumping drill holes 9 distributed around the pumping-increasing guide hole 10 by taking the pumping-increasing guide hole 10 as a center;
then, a liquid CO2 phase changer 11 is placed into the pumping-increasing guide hole 10, an orifice is sealed, the gas extraction pipe 1 and the telescopic string bag 3 are placed at the bottom of the extraction drill hole 9, the pushing nut is rotated to compress the constant-resistance spiral spring to generate forward thrust, the supporting framework 5 is further unfolded, the telescopic string bag 3 is supported, the string bag is tightly attached to the wall surface of the drill hole and provides certain pretightening force, when the pretightening force is applied to the limit, the size of the string bag fully considers the influence range of the friction force between particles, coal rock particles in the string bag can be supported, and the coal rock particles are prevented from falling off;
then, injecting sealing slurry into the flexible grouting bag body 201 by using a grouting method, enabling the sealing slurry to permeate into surrounding rocks around the hole packer 2 through the grouting holes 204 on the bag, reducing the air permeability of the surrounding rocks in the area while reinforcing the surrounding rocks around the hole packer 2, further compressing and compacting the surrounding rocks around the hole packer 2 under the action of expansion and compression of the flexible grouting bag body 201, closing a grouting valve after grouting is finished, and rotating the extrusion sleeve 205 on the rear side to enable the extrusion sleeve 205 on the rear side to push towards the flexible grouting bag body 201 so as to further extrude two ends of the flexible grouting bag body 201, so that the sealing effect of the sealer is further improved;
starting an extraction pump 8 to extract gas, starting a liquid CO2 phase changer 11 when the gas extraction concentration is low, heating liquid CO2 in a liquid CO2 phase changer 11 by using a heating element 13, heating the liquid CO2 to gasify the liquid CO2 into high-pressure CO2 gas, spraying the gas out of an energy discharge port 12, performing phase change blasting on surrounding rocks to generate directional fractures, so that the extraction range of an extraction drill hole 9 is expanded, directional pumping increase of the extraction drill hole 9 is realized, and the telescopic string bag 3 supports avoidance of the extraction drill hole 9, so that the smoothness of the extraction drill hole 9 is ensured.
Any embodiment disclosed herein above is meant to disclose, unless otherwise indicated, all numerical ranges disclosed as being preferred, and any person skilled in the art would understand that: the preferred ranges are merely those values which are obvious or representative of the technical effect which can be achieved. Since the numerical values are too numerous to be exhaustive, some of the numerical values are disclosed in the present invention to illustrate the technical solutions of the present invention, and the above-mentioned numerical values should not be construed as limiting the scope of the present invention.
Meanwhile, if the invention as described above discloses or relates to parts or structural members fixedly connected to each other, the fixedly connected parts can be understood as follows, unless otherwise stated: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connections (e.g. riveting, welding), but of course, fixed connections to each other may also be replaced by one-piece structures (e.g. manufactured integrally using a casting process) (unless it is obviously impossible to use an integral forming process).
In addition, terms used in any technical solutions disclosed in the present invention to indicate positional relationships or shapes include approximate, similar or approximate states or shapes unless otherwise stated. Any part provided by the invention can be assembled by a plurality of independent components or can be manufactured by an integral forming process.
The above examples are merely illustrative for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. Nor is it intended to be exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.
Claims (10)
1. High gas weak coal seam drainage system, its characterized in that includes:
the tail end of the gas extraction pipe (1) is connected with an extraction pump (8);
the hole packer (2) is arranged on the gas extraction pipe (1) and used for sealing the hole opening of the extraction drill hole (9);
the telescopic net bag (3) is sleeved outside the gas extraction pipe (1);
the sliding sleeve (4) is slidably mounted on the gas extraction pipe (1);
one end of the supporting framework (5) is hinged with the sliding sleeve (4), and the other end of the supporting framework is hinged with the telescopic net bag (3);
the linear driving piece (6) is arranged on the gas extraction pipe (1) and used for driving the sliding sleeve (4) to slide;
an elastic element (7) arranged between the sliding sleeve (4) and the linear driving element (6);
after the gas extraction pipe (1) and the telescopic net bag (3) are inserted into an extraction drill hole (9) in a coal seam, when the sliding sleeve (4) is driven by the linear driving piece (6) to move to a spreading position, the supporting framework (5) is spread to spread the telescopic net bag (3) and is abutted against the wall surface of the extraction drill hole (9).
2. The high gas weak coal seam extraction system according to claim 1, wherein the hole packer (2) comprises:
the flexible grouting bag body (201) is sleeved on the gas extraction pipe (1), and a grouting hole (204) is formed in the outer wall of the flexible grouting bag body;
the grouting pump (203) is communicated with the inner cavity of the flexible grouting bag body (201) through a grouting pipe (202);
and after the grouting pump (203) injects sealing slurry into the flexible grouting bag body (201), the flexible grouting bag body (201) is forced to expand so as to be tightly attached to the gas extraction pipe (1) and the extraction borehole (9).
3. The high gas weak coal seam extraction system according to claim 2, characterized in that: the hole packer (2) further comprises an automatic extrusion module, and the automatic extrusion module is arranged on the gas extraction pipe (1) and used for forcing the flexible grouting bag body (201) to expand;
the automatic extrusion module comprises two extrusion sleeves (205) which can approach or depart from each other;
the two extrusion sleeves (205) are respectively positioned on the front side and the rear side of the flexible grouting bag body (201), the extrusion sleeve (205) positioned on the front side is fixedly connected with the gas extraction pipe (1), and the extrusion sleeve (205) positioned on the rear side is in threaded connection with the gas extraction pipe (1).
4. The high gas weak coal seam extraction system according to claim 3, characterized in that: the two ends of the inner cavity wall of the flexible grouting capsule body (201) are provided with extrusion conical surfaces, and one end, facing the flexible grouting capsule body (201), of the extrusion sleeve (205) is provided with a matching conical surface (206) corresponding to the extrusion conical surfaces.
5. The high gas weak coal seam extraction system according to claim 1, characterized in that: supporting framework (5) are followed the axial interval of sliding sleeve (4) sets up a plurality ofly, every supporting framework (5) are including following many connecting rods (501) that the circumference of sliding sleeve (4) was evenly arranged, every the one end of connecting rod (501) with sliding sleeve (4) are articulated, the other end outwards extend forward with telescopic string bag (3) are articulated.
6. The high gas weak coal seam extraction system according to claim 1, characterized in that: the elastic element (7) is a spiral spring sleeved on the gas extraction pipe (1);
the linear driving piece (6) is a pushing nut which is sleeved outside the gas extraction pipe (1) and is in threaded connection with the gas extraction pipe (1).
7. The high gas weak coal seam extraction system according to any one of claims 1 to 6, characterized in that: the coal seam is also provided with pumping-increasing guide holes (10), and the pumping drill holes (9) are uniformly distributed around the pumping-increasing guide holes (10) by taking the pumping-increasing guide holes (10) as the center;
and a loading mechanism for applying dynamic disturbance to the coal seam around the pumping-increasing guide hole (10) to enable the coal seam to generate cracks is arranged in the pumping-increasing guide hole (10), and the pumping range of the gas pumping pipe (1) is partially overlapped with the cracking range of the pumping-increasing guide hole (10).
8. The high gas weak coal seam extraction system according to claim 7, characterized in that: the loading mechanism comprises a liquid CO2 phase changer (11), and the liquid CO2 phase changer (11) is used for gasifying liquid CO2 into high-pressure CO2 gas and discharging the gas to the wall surface of the pumping guide hole (10) directionally through a discharge port (12).
9. The high gas weak coal seam extraction system according to claim 8, characterized in that: the energy leakage ports (12) are uniformly arranged on the liquid CO2 phase changer (11) along the circumferential direction of the extraction increasing guide hole (10), and each energy leakage port (12) is aligned with one extraction drill hole (9).
10. The method for extracting the high gas soft and weak coal seam is characterized by comprising the following steps of:
step 1, drilling an extraction borehole (9) on a coal seam;
step 2, inserting the gas extraction pipe (1) into an extraction borehole (9);
step 3, the linear driving piece (6) drives the sliding sleeve (4) to move forwards, the elastic element (7) is pressed to generate forward thrust, the supporting framework (5) is unfolded, and the telescopic net bag (3) is unfolded and supports the wall surface of the extraction drill hole (9);
step 4, sealing the hole opening of the extraction drill hole (9) by using the hole packer (2);
and 5, starting an extraction pump (8) to extract gas, wherein when the stress of the drilling surrounding rock is large, the telescopic net bag (3) contracts radially, the supporting framework (5) is retracted, and the elastic element (7) is pressed, so that high stress is released, pressure yielding is realized, and pressure relief of the drilling surrounding rock is realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110854208.XA CN113431623B (en) | 2021-07-28 | 2021-07-28 | High-gas weak coal seam extraction system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110854208.XA CN113431623B (en) | 2021-07-28 | 2021-07-28 | High-gas weak coal seam extraction system and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113431623A true CN113431623A (en) | 2021-09-24 |
| CN113431623B CN113431623B (en) | 2023-06-09 |
Family
ID=77762209
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110854208.XA Active CN113431623B (en) | 2021-07-28 | 2021-07-28 | High-gas weak coal seam extraction system and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113431623B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114033330A (en) * | 2021-11-25 | 2022-02-11 | 山东省水利勘测设计院 | Isolation device and isolation method for surveying penetration of drill hole through karst cave or crack |
| CN114263449A (en) * | 2021-12-14 | 2022-04-01 | 中国矿业大学 | High-efficient gas drainage device based on hydraulic fracturing |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101446178A (en) * | 2008-11-13 | 2009-06-03 | 煤炭科学研究总院西安研究院 | Wind pressure air drilling equipment in downhole soft outbursting coal bed and process matched therewith |
| CN102900460A (en) * | 2012-11-06 | 2013-01-30 | 中国矿业大学 | Method for performing through-going seam cutting, pressure relief, permeability enhancement and quick tunneling on soft and high-outburst coal seam |
| WO2016110185A1 (en) * | 2015-01-06 | 2016-07-14 | 中国矿业大学 | Method for gas extraction alternating oscillating pulse high energy gas extraction with thermal injection |
-
2021
- 2021-07-28 CN CN202110854208.XA patent/CN113431623B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101446178A (en) * | 2008-11-13 | 2009-06-03 | 煤炭科学研究总院西安研究院 | Wind pressure air drilling equipment in downhole soft outbursting coal bed and process matched therewith |
| CN102900460A (en) * | 2012-11-06 | 2013-01-30 | 中国矿业大学 | Method for performing through-going seam cutting, pressure relief, permeability enhancement and quick tunneling on soft and high-outburst coal seam |
| WO2016110185A1 (en) * | 2015-01-06 | 2016-07-14 | 中国矿业大学 | Method for gas extraction alternating oscillating pulse high energy gas extraction with thermal injection |
Non-Patent Citations (1)
| Title |
|---|
| 刘延保;: "煤层瓦斯抽采区域提浓技术体系及应用" * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114033330A (en) * | 2021-11-25 | 2022-02-11 | 山东省水利勘测设计院 | Isolation device and isolation method for surveying penetration of drill hole through karst cave or crack |
| CN114263449A (en) * | 2021-12-14 | 2022-04-01 | 中国矿业大学 | High-efficient gas drainage device based on hydraulic fracturing |
| CN114263449B (en) * | 2021-12-14 | 2022-09-16 | 中国矿业大学 | High-efficient gas drainage device based on hydraulic fracturing |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113431623B (en) | 2023-06-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113431623A (en) | High-gas weak coal seam extraction system and method | |
| EP2670941B1 (en) | System for lining a wellbore | |
| CN112031675B (en) | Sectional type grouting equipment for ground drilling | |
| CN109667565B (en) | Bare hole anchoring device and process method | |
| CN103732850A (en) | Annular barrier with pressure amplification | |
| CN103339344A (en) | Setting tool | |
| CN104169519A (en) | Annular barrier having flexible connection | |
| CN112610176A (en) | Construction process for recovering abandoned well casing | |
| CN114233249B (en) | Pressure-resistant sieve tube for high-temperature oil well operation | |
| CN113279720B (en) | Bidirectional expansion sealing mechanism and bidirectional expansion sealing packer thereof | |
| CN113464185B (en) | Recoverable yielding anchor rod and method for reinforcing rock mass by using same | |
| CN113153394B (en) | Self-expansion reinforced anchoring type anchor rod structure and method for narrow coal pillar along-void gate way end | |
| CN104563954A (en) | Steel pipe expansion recovery type external casing packer | |
| CN112855067B (en) | Mechanical expansion type leakage stopping tool and leakage stopping method thereof | |
| CN104136711B (en) | The sprawl and control device of packer body, sprawl and control method and cloth piping tool | |
| CN211474070U (en) | Fishing type blanking plug | |
| CN110529155B (en) | Drill bit grout stopping drill rod sectional retreating type grouting method | |
| CN109779543B (en) | Expansion pipe pressurization system | |
| CN114961674B (en) | Horizontal section double-pipe subsection shunt synchronous injection and production technology | |
| CN112610177B (en) | Extrusion device and extrusion operation method for abandoned well casing recovery operation | |
| RU2719881C1 (en) | Method for installation of shaped shutter in well and device for its implementation | |
| KR101831557B1 (en) | Construction method using the expansion type rock bolt construction device | |
| CN112282808A (en) | Large-mining-height rib-caving-prevention anchoring coal top injection device and using method thereof | |
| CN114991700B (en) | High-temperature high-pressure water injection packer | |
| CN219365988U (en) | Novel combined type shaft repairing device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |