CN113431623B - High-gas weak coal seam extraction system and method - Google Patents
High-gas weak coal seam extraction system and method Download PDFInfo
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- CN113431623B CN113431623B CN202110854208.XA CN202110854208A CN113431623B CN 113431623 B CN113431623 B CN 113431623B CN 202110854208 A CN202110854208 A CN 202110854208A CN 113431623 B CN113431623 B CN 113431623B
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- 238000000605 extraction Methods 0.000 title claims abstract description 151
- 239000003245 coal Substances 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000005553 drilling Methods 0.000 claims abstract description 67
- 239000011435 rock Substances 0.000 claims description 38
- 238000001125 extrusion Methods 0.000 claims description 36
- 239000007788 liquid Substances 0.000 claims description 23
- 238000005086 pumping Methods 0.000 claims description 18
- 238000007789 sealing Methods 0.000 claims description 18
- 238000007599 discharging Methods 0.000 claims description 11
- 239000002002 slurry Substances 0.000 claims description 11
- 230000007246 mechanism Effects 0.000 claims description 8
- 230000007480 spreading Effects 0.000 claims description 2
- 238000003892 spreading Methods 0.000 claims description 2
- 239000002245 particle Substances 0.000 description 11
- 230000000694 effects Effects 0.000 description 9
- 230000035699 permeability Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005422 blasting Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 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
- 238000007569 slipcasting Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- 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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- 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
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- 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
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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)
- Pipe Accessories (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention discloses a high-gas weak coal seam extraction system and a method, which aim to ensure smoothness of an extraction pipeline in a gas extraction process and improve extraction efficiency. Therefore, the embodiment of the invention provides a high-gas weak coal seam extraction system, which 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 arranged on the gas extraction pipe, two ends of the sliding sleeve, a sliding sleeve and a telescopic net bag hinged support framework, a linear driving piece and an elastic element, wherein 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, and after the gas extraction pipe and the telescopic net bag are inserted into an extraction drilling hole on a coal seam, the linear driving piece drives the sliding sleeve to move to a propping position, and the support framework is stretched to prop the telescopic net bag and is propped against the wall surface of the extraction drilling 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
The coal seam gas extraction is the most direct and effective means for eliminating the coal seam outburst risk, and when the coal seam is drilled and extracted, two main measures are adopted for improving the coal seam gas extraction rate: firstly, the number of extraction drilling holes is increased, drilling parameters are optimized, and secondly, auxiliary measures are taken to improve the permeability of the coal bed. However, the high-gas weak coal seam is relatively weak and granular, and has the characteristic of creep deformation under the action of load, so that the problems of hole collapse, borehole peeling, borehole large deformation and the like are very easy to occur under the action of negative pressure during gas extraction, accidents such as blockage of extraction pipelines, reduction of extraction negative pressure and the like are caused, and extraction efficiency is reduced.
Disclosure of Invention
The invention mainly aims to provide a high-gas weak coal seam extraction system and a method, which aim to ensure smoothness of an extraction pipeline in a gas extraction process and improve extraction efficiency.
Therefore, in one aspect, the high gas weak coal seam extraction system provided by the embodiment of the invention comprises:
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 is used for sealing the orifice of the extraction drilling hole;
the telescopic net bag is sleeved outside the gas extraction pipe and is cylindrical;
the sliding sleeve is slidably arranged 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;
an elastic element 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 drilling hole in a coal bed, when the linear driving piece drives the sliding sleeve to move to a spreading position, the supporting framework spreads to spread the telescopic net bag and is abutted to the wall surface of the extraction drilling hole.
Specifically, the hole packer includes:
the flexible grouting bag body is sleeved on the gas extraction pipe, and grouting holes are 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;
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 drilling 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 be mutually close to or far away from each other;
the two extrusion sleeves are respectively positioned at the front side and the rear side of the flexible grouting bag body, the extrusion sleeve positioned at the front side is fixedly connected with the gas extraction pipe, and the extrusion sleeve positioned at the rear side is in threaded connection with the gas extraction pipe.
Specifically, two ends of the inner cavity wall of the flexible grouting bag body are provided with extrusion conical surfaces, and one end of the extrusion sleeve, which faces the flexible grouting bag body, is provided with a matching conical surface matched with the corresponding extrusion conical surface.
Specifically, the support skeleton is followed the axial interval of sliding sleeve sets up a plurality of, every the support skeleton includes along the circumference of sliding sleeve evenly arranged's many connecting rods, every one end of connecting rod with the sliding sleeve articulates, and the other end outwards extends forward with the telescopic string bag articulates.
Specifically, the elastic element is a coil spring sleeved on the gas extraction pipe.
Specifically, the linear driving piece is a pushing nut sleeved outside the gas extraction pipe and in threaded connection with the gas extraction pipe.
Specifically, the coal seam is also provided with pumping-increasing guide holes, the pumping-increasing guide holes are uniformly distributed around the pumping-increasing guide holes by taking the pumping-increasing guide holes as the center, a loading mechanism for applying dynamic disturbance to the coal seam around the pumping-increasing guide holes so as to enable the coal seam to generate cracks is arranged in the pumping-increasing guide holes, and the pumping range of the gas pumping pipe is partially overlapped with the fracturing range of the pumping-increasing guide holes.
Specifically, the loading mechanism comprises a liquid CO2 phase changer, wherein the liquid CO2 phase changer is used for gasifying liquid CO2 into high-pressure CO2 gas and directionally discharging the high-pressure CO2 gas to the wall surface of the pumping increasing guide hole through the energy discharging port.
Specifically, the energy discharging ports are uniformly arranged on the liquid CO2 phase changer along the circumferential direction of the pumping increasing guide hole, and each energy discharging port is aligned to one pumping drilling hole.
According to the high-gas weak coal seam extraction method provided by the embodiment of the invention, the high-gas weak coal seam extraction system is used for extraction, and the method comprises the following steps:
and 5, starting a gas extraction pump to extract gas.
Compared with the prior art, at least one embodiment of the invention has the following beneficial effects: the telescopic net bag for supporting the extraction drilling holes is arranged on the gas extraction pipe, so that smoothness of the extraction drilling holes is ensured, when the surrounding rock stress of the extraction drilling holes is large, the telescopic net bag can be contracted under the pressure effect, so that surrounding rock around the extraction drilling holes is loosened, high stress is released, the yielding effect is exerted, surrounding rock around the extraction drilling holes is relieved, coal seam particles of surrounding rock around the extraction drilling holes are loosened, smoothness of coal seam extraction cracks is ensured, and gas extraction rate is ensured.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an arrangement of a high gas weak coal seam extraction system provided by an embodiment of the invention;
FIG. 2 is a schematic diagram of a gas extraction assembly according to an embodiment of the present invention;
FIG. 3 is a cross-sectional view taken along the direction A-A in FIG. 1;
FIG. 4 is a schematic diagram of a loading mechanism according to an embodiment of the present invention;
wherein: 1. a gas extraction pipe; 2. a hole packer; 201. a flexible grouting bag body; 202. grouting pipe; 203. a grouting pump; 204. grouting holes; 205. extruding the sleeve; 206. matching with a conical surface; 3. a telescopic net bag; 4. a sliding sleeve; 5. a support skeleton; 501. a connecting rod; 6. a linear driving member; 7. an elastic element; 8. a pump; 9. extracting and drilling holes; 10. increasing the pumping guide hole; 11. a liquid CO2 phase shifter; 12. an energy release port; 13. a heating element.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
Referring to fig. 1 and 2, a high gas weak coal seam drainage system comprises a gas drainage component, the gas drainage component comprises a gas drainage pipe 1, a hole packer 2, a telescopic net bag 3, a sliding sleeve 4, a supporting framework 5, a linear driving piece 6 and an elastic element 7, the tail end of the gas drainage pipe 1 is connected with a drainage pump 8, the hole packer 2 is arranged on the gas drainage pipe 1 and used for sealing an orifice of a drainage drilling hole 9, the telescopic net bag 3 is cylindrically sleeved outside the gas drainage pipe 1, the aperture of the telescopic net bag 3 is smaller than the particle size of coal rock particles, the sliding sleeve 4 is slidably mounted on the gas drainage 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 drainage pipe 1 and used for driving the sliding sleeve 4 to slide on the gas drainage 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 weak 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 drilled hole is large, radially contracting the telescopic net bag 3 to release the high stress and exert the function of yielding, so that the surrounding rock of the drilled hole is relieved.
In this embodiment, the telescopic net bag 3 for supporting the drainage drilling hole 9 is arranged on the gas drainage pipe 1, so that smoothness of the drainage drilling hole 9 is ensured, when the surrounding rock stress of the drainage drilling hole 9 is large, the telescopic net bag 3 can be contracted under the pressure effect, so that surrounding rock around the drainage drilling hole 9 is loosened, high stress is released, the yielding effect is exerted, surrounding rock around the drainage drilling hole 9 is relieved, coal seam particles around the drainage drilling hole 9 are loosened, smoothness of coal seam drainage cracks is ensured, and gas drainage rate is ensured.
Referring to fig. 3, in some embodiments, a drainage increasing guide hole 10 may be further disposed on the coal seam, the drainage drill holes 9 are uniformly distributed around the drainage increasing guide hole 10 with the drainage increasing guide hole 10 as a center, a loading mechanism for applying dynamic disturbance to the coal seam around the drainage increasing guide hole is disposed in the drainage increasing guide hole 10 so as to generate a crack, and the drainage range of the gas drainage pipe 1 partially coincides with the fracturing range of the drainage increasing guide hole 10. By means of the design mode, dynamic disturbance can be applied to surrounding rocks by using the loading mechanism, and as the surrounding rocks generate cracks parallel to the dynamic loading direction under the condition of dynamic disturbance, the directional damage of the surrounding rocks is enhanced, so that the purpose of increasing pumping of the pumping drilling hole 9 can be achieved. As for the number and size of the extraction holes 9, a person skilled in the art can determine the permeability of a specific coal seam, and only needs to ensure that the extraction ranges of two adjacent extraction holes 9 partially coincide.
Referring to fig. 3 and fig. 4, specifically, the loading mechanism includes a liquid CO2 phase changer 11, the liquid CO2 phase changer 11 is configured to gasify liquid CO2 into high-pressure CO2 gas and directionally discharge the high-pressure CO2 gas to a wall surface of the pumping-up guide hole 10 through energy discharging ports 12, and the energy discharging ports 12 are uniformly arranged on the liquid CO2 phase changer 11 along a circumferential direction of the pumping-up guide hole 10, and each energy discharging port 12 is aligned with one pumping drilling hole 9.
In this embodiment, when the extraction work is performed, 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 perform gas extraction until the gas extraction concentration is smaller, the liquid CO2 phase changer 11 is started, the heating element 13 is used to heat the liquid CO2 in the liquid CO2 phase changer 11, the liquid CO2 is heated and gasified into high-pressure CO2 gas and sprayed out from the energy release port 12, and phase change blasting is performed on surrounding rock to generate directional cracks, so that the extraction range of the extraction drilling hole 9 is enlarged, and the directional extraction increasing of the extraction drilling hole 9 is realized.
Referring to fig. 1 and 2, in other embodiments, the hole packer 2 includes 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 an outer wall, 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 drilling hole 9.
In this embodiment, the grouting pump 203 is used to inject the sealing slurry into the flexible grouting bag 201, in the grouting process, the sealing slurry fills the flexible grouting bag 201 and forces the flexible grouting bag 201 to expand, the gap between the drainage drilling hole 9 and the flexible grouting bag 201 and the gap between the gas drainage pipe 1 and the flexible grouting bag 201 are sealed, along with the grouting, the sealing slurry enters the surrounding rock around the hole packer 2 through the grouting hole 204, the surrounding rock around the hole packer 2 is reinforced, the air permeability of the surrounding rock around the area is reduced, along with the further progress of grouting, the resistance of the sealing slurry penetrating into the surrounding rock is gradually increased, the flexible grouting bag 201 further expands, and the surrounding rock around the hole packer 2 is further compressed and compacted, so that the air permeability of the surrounding rock around the area is further reduced, and the drainage force can be further reduced.
Referring to fig. 1 and 2, it can be understood that the hole packer 2 further includes an automatic extrusion module disposed on the gas extraction pipe 1 for forcing the flexible grouting bladder 201 to expand, the automatic extrusion module including two extrusion sleeves 205 that can be moved toward or away from each other; wherein, two extrusion sleeves 205 are located the front side and the rear side of flexible slip casting bag body 201 respectively, and the extrusion sleeve 205 that is located the front side is fixed connection with gas extraction pipe 1, and the extrusion sleeve 205 that is located the rear side is threaded connection with gas extraction pipe 1. After grouting is finished, when the sealing slurry is initially set, the grouting valve is closed, and the extrusion sleeve 205 at the rear side is screwed, so that the extrusion sleeve 205 at the rear side is pushed in the direction of the flexible grouting bag body 201 to further extrude the two ends of the flexible grouting bag body 201, so that the slurry is forced to be fed and further extrude surrounding rock, 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 bag body 201 are provided with extrusion conical surfaces, one end of the extrusion sleeve 205 facing the flexible grouting bag body 201 is provided with a matching conical surface 206 matched with the corresponding extrusion conical surface, by arranging the extrusion conical surfaces, the extrusion sleeve 205 is not only beneficial to being inserted into the flexible grouting bag body 201, and extrusion force is applied to the flexible grouting bag body 201, but also in such a design manner, the damage of the extrusion sleeve 205 to the flexible grouting bag body 201 is smaller.
Referring to fig. 2, it should be explained that, in a specific application, the supporting frameworks 5 are disposed at intervals along the axial direction of the sliding sleeve 4, each supporting framework 5 includes a plurality of connecting rods 501 uniformly disposed 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 extends forward and outwards to be hinged to the telescopic net bag 3, so that the wall surface of the extraction drilling hole 9 can be effectively ensured to be uniformly spread and tightly adhered by each part of the telescopic net bag 3, even after the supporting frameworks 5 are folded, the telescopic net bag 3 can still be tightly adhered to the wall surface of the extraction drilling hole 9, support is provided for the extraction drilling hole 9, and the basic form of the extraction drilling hole 9 is kept unchanged.
In practical designs, the elastic element 7 may be a coil spring that is sleeved on the gas extraction pipe 1, and of course, the elastic element 7 may also be a rubber spring or other similar elastic element 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 extraction efficiency, not only is an extraction port arranged at the front end of the gas extraction pipe 1, but also extraction holes can be uniformly added on the pipe wall of the gas extraction pipe 1, and through holes corresponding to the gas extraction holes are correspondingly required to be arranged on the sliding sleeve 4.
In other embodiments, the linear driving piece 6 is a pushing nut sleeved outside the gas extraction pipe 1, external threads matched with the pushing nut are arranged outside the gas extraction pipe 1, the pushing nut is screwed to enable the spiral spring to be compressed to generate forward thrust, then the supporting framework 5 is unfolded, the telescopic string bag 3 is supported, when the stress of surrounding rock of a drilled hole is large, the supporting framework 5 is retracted and further compresses the spiral spring, the telescopic string bag 3 is contracted radially, the purpose of 'yielding' is achieved, and the surrounding rock of the drilled hole is relieved. Of course, other similar linear drives 6 such as hydraulic cylinders or pneumatic cylinders may be used for the linear drive 6.
Referring to fig. 1 to 4, the working process of the high gas weak coal seam extraction system with the structure is as follows:
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 holes 9 distributed around the pumping-increasing guide hole 10 by taking the pumping-increasing guide hole 10 as a center;
then, the liquid CO2 phase changer 11 is placed into the pumping-increasing guide hole 10, the hole opening is closed, the gas pumping pipe 1 and the telescopic net bag 3 are placed into the bottom of the pumping drilling hole 9, the pushing nut is rotated, so that the constant-resistance spiral spring is compressed to generate forward thrust, the supporting framework 5 is further unfolded, the telescopic net bag 3 is propped up, the net bag is clung to the wall surface of the drilling hole and gives a certain pretightening force, when the pretightening force is applied to the limit, the influence range of friction force among particles is fully considered by the size of the net bag, coal and rock particles in the net bag can be supported, and the falling of the coal and rock particles is prevented;
injecting sealing slurry into the flexible grouting bag 201 by using a grouting method, enabling the sealing slurry to permeate into surrounding rocks around the hole packer 2 through grouting holes 204 on the bag, reinforcing the surrounding rocks around the hole packer 2, reducing the air permeability of the surrounding rocks around the area, further compressing and compacting the surrounding rocks around the hole packer 2 under the action of expansion and compression of the flexible grouting bag 201, closing a grouting valve after grouting is finished, rotating a rear extrusion sleeve 205, and enabling the rear extrusion sleeve 205 to push towards the direction of the flexible grouting bag 201 so as to further extrude two ends of the flexible grouting bag 201, and further increasing the sealing effect of the sealer;
when the gas extraction concentration is small, the liquid CO2 phase changer 11 is started, the heating element 13 is used for heating liquid CO2 in the liquid CO2 phase changer 11, 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 carried out on surrounding rock to generate directional cracks, so that the extraction range of the extraction drilling hole 9 is enlarged, the directional extraction of the extraction drilling hole 9 is realized, the telescopic net bag 3 supports the extraction drilling hole 9 to avoid, the smoothness of the extraction drilling hole 9 is ensured, when the drilling surrounding rock stress is large, the net bag can shrink under the pressure effect, surrounding rock around the drilling hole is loosened, the high stress is released, the 'yielding' effect is exerted, the drilling surrounding rock is relieved, surrounding rock particles become sparse, the smoothness of the coal seam extraction cracks is ensured, and the gas extraction rate is ensured.
Any of the above-described embodiments of the present invention disclosed herein, unless otherwise stated, if they disclose a numerical range, then the disclosed numerical range is the preferred numerical range, as will be appreciated by those of skill in the art: the preferred numerical ranges are merely those of the many possible numerical values where technical effects are more pronounced or representative. Since the numerical values are more and cannot be exhausted, only a part of the numerical values are disclosed to illustrate the technical scheme of the invention, and the numerical values listed above should not limit the protection scope of the invention.
Meanwhile, if the above invention discloses or relates to parts or structural members fixedly connected with each other, the fixed connection may be understood as follows unless otherwise stated: detachably fixed connection (e.g. using bolts or screws) can also be understood as: the non-detachable fixed connection (e.g. riveting, welding), of course, the mutual fixed connection may also be replaced by an integral structure (e.g. integrally formed using a casting process) (except for obviously being unable to use an integral forming process).
In addition, terms used in any of the above-described aspects of the present disclosure to express positional relationship or shape have meanings including a state or shape similar to, similar to or approaching thereto 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 only illustrative of the invention and are not intended to be limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. Nor is it necessary or impossible to exhaust all embodiments herein. And obvious variations or modifications thereof are contemplated as falling within the scope of the present invention.
Claims (9)
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 is used for sealing the orifice of the extraction drilling hole (9);
a telescopic net bag (3) is sleeved outside the gas extraction pipe (1);
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), 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 is used for driving the sliding sleeve (4) to slide;
an elastic element (7) arranged between the sliding sleeve (4) and the linear drive (6);
after the gas extraction pipe (1) and the telescopic net bag (3) are inserted into an extraction drilling hole (9) on a coal seam, when the linear driving piece (6) drives the sliding sleeve (4) to move to a spreading position, the supporting framework (5) spreads the telescopic net bag (3) to spread and abut against the wall surface of the extraction drilling hole (9);
the support frameworks (5) are arranged at intervals along the axial direction of the sliding sleeve (4), each support framework (5) comprises a plurality of connecting rods (501) which are uniformly distributed along the circumferential direction of the sliding sleeve (4), one end of each connecting rod (501) is hinged with the sliding sleeve (4), and the other end of each connecting rod extends forwards and outwards to be hinged with the telescopic net bag (3).
2. The high gas weak coal seam drainage 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 grouting holes (204) are formed in the outer wall of the flexible grouting bag body;
a grouting pump (203) which is communicated with the inner cavity of the flexible grouting bag body (201) through a grouting pipe (202);
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 drilling hole (9).
3. The high gas weak coal seam drainage system according to claim 2, wherein: 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 bag body (201) to expand;
the automatic extrusion module comprises two extrusion sleeves (205) which can be mutually close to or far away from each other;
the two extrusion sleeves (205) are respectively positioned at the front side and the rear side of the flexible grouting bag body (201), the extrusion sleeve (205) positioned at the front side is fixedly connected with the gas extraction pipe (1), and the extrusion sleeve (205) positioned at the rear side is in threaded connection with the gas extraction pipe (1).
4. The high gas weak coal seam drainage system according to claim 3, wherein: the two ends of the inner cavity wall of the flexible grouting bag body (201) are provided with extrusion conical surfaces, and one end of the extrusion sleeve (205) facing the flexible grouting bag body (201) is provided with a matching conical surface (206) matched with the corresponding extrusion conical surface.
5. The high gas weak coal seam drainage system according to claim 1, wherein: the elastic element (7) is a spiral spring sleeved on the gas extraction pipe (1);
the linear driving piece (6) is a pushing nut sleeved outside the gas extraction pipe (1) and in threaded connection with the gas extraction pipe (1).
6. A high gas weak coal seam drainage system according to any of claims 1-5, wherein: the coal seam is also provided with pumping increasing guide holes (10), and the pumping drilling holes (9) are uniformly distributed around the pumping increasing guide holes (10) by taking the pumping increasing guide holes (10) as the center;
the gas extraction guide hole (10) is internally provided with a loading mechanism for applying dynamic disturbance to the coal bed around the gas extraction guide hole (10) so as to generate cracks, and the extraction range of the gas extraction pipe (1) is partially overlapped with the fracturing range of the gas extraction guide hole (10).
7. The high gas weak coal seam drainage system according to claim 6, wherein: the loading mechanism comprises a liquid CO2 phase changer (11), wherein the liquid CO2 phase changer (11) is used for gasifying liquid CO2 into high-pressure CO2 gas and directionally discharging the high-pressure CO2 gas to the wall surface of the pumping-up guide hole (10) through the energy discharging port (12).
8. The high gas weak coal seam drainage system according to claim 7, wherein: the energy discharging ports (12) are uniformly distributed on the liquid CO2 phase-change device (11) along the circumferential direction of the pumping increasing guide hole (10), and each energy discharging port (12) is aligned to one pumping drilling hole (9).
9. A method for extracting a high-gas weak coal seam, which is characterized by comprising the following steps of:
step 1, drilling a drainage drilling hole (9) on a coal seam;
step 2, inserting the gas extraction pipe (1) into an extraction drilling hole (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 drilling hole (9);
step 4, sealing the orifice of the extraction drilling hole (9) by using the hole packer (2);
and 5, starting a gas extraction pump (8) to extract gas, when the stress of the surrounding rock of the drilled hole is large, radially shrinking the telescopic net bag (3), adducting the supporting framework (5), compressing the elastic element (7) to release the high stress, realizing yielding and releasing the pressure of the surrounding rock of the drilled hole.
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