CN113279737A - Extraction system and extraction method for coal seam water injection and coal seam gas extraction - Google Patents
Extraction system and extraction method for coal seam water injection and coal seam gas extraction Download PDFInfo
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- CN113279737A CN113279737A CN202110663235.9A CN202110663235A CN113279737A CN 113279737 A CN113279737 A CN 113279737A CN 202110663235 A CN202110663235 A CN 202110663235A CN 113279737 A CN113279737 A CN 113279737A
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- 238000000605 extraction Methods 0.000 title claims abstract description 165
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 139
- 239000003245 coal Substances 0.000 title claims abstract description 109
- 238000002347 injection Methods 0.000 title claims abstract description 109
- 239000007924 injection Substances 0.000 title claims abstract description 109
- 238000005070 sampling Methods 0.000 claims abstract description 194
- 238000000034 method Methods 0.000 claims abstract description 15
- 238000012856 packing Methods 0.000 claims description 19
- 239000000463 material Substances 0.000 claims description 7
- 239000004033 plastic Substances 0.000 claims description 7
- 229920003023 plastic Polymers 0.000 claims description 7
- 239000011347 resin Substances 0.000 claims description 7
- 229920005989 resin Polymers 0.000 claims description 7
- 230000002093 peripheral effect Effects 0.000 claims description 5
- 230000004323 axial length Effects 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 2
- 239000012466 permeate Substances 0.000 abstract description 4
- 238000005065 mining Methods 0.000 description 16
- 238000007789 sealing Methods 0.000 description 10
- 239000002817 coal dust Substances 0.000 description 7
- 238000005553 drilling Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 241000446313 Lamella Species 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001151 other effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000006467 substitution reaction 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
- 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
- E21B43/006—Production of coal-bed methane
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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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/14—Obtaining from a multiple-zone well
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/20—Displacing by water
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/30—Specific pattern of wells, e.g. optimising the spacing of wells
- E21B43/305—Specific pattern of wells, e.g. optimising the spacing of wells comprising at least one inclined or horizontal well
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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
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/08—Obtaining fluid samples or testing fluids, in boreholes or wells
- E21B49/084—Obtaining fluid samples or testing fluids, in boreholes or wells with means for conveying samples through pipe to surface
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- Engineering & Computer Science (AREA)
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- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
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Abstract
The invention relates to an extraction system and an extraction method for coal seam water injection and coal seam gas extraction, wherein in the first step, the extraction system is arranged on a coal seam; a second step; defining two adjacent water injection sections as a first water injection section and a second water injection section from a stope face from near to far, wherein the two adjacent sampling sections are a first sampling section corresponding to the first water injection section and a second sampling section corresponding to the second water injection section respectively; and repeating the second step to complete water injection of all the water injection sections and coal bed gas suction at the periphery of all the rear water injection sections. The method solves the technical problems that the existing technology cannot judge that water energy completely permeates a coal bed and the extraction efficiency of the coal bed gas in the coal bed is not high.
Description
Technical Field
The invention relates to an extraction system and an extraction method for coal seam water injection and coal seam gas extraction in the field of coal mining.
Background
In mining, for safety, the roadway is opened from left to right, the roadway is opened to enter the far position of the planned mining area, the working face in formal mining is called a stope face, and then mining is carried out along the stope face from back to front. In the coal seam mining process, the main potential safety hazards influencing mining are coal bed gas in the coal seam and coal dust generated in the mining process, and the coal bed gas and the coal dust are inflammable and explosive, so that the control of the coal bed gas and the coal dust is the key of safe mining.
Coal seam water injection is an important means for controlling coal seam gas and coal dust, and is characterized in that before mining, pressure water is injected into a coal seam by using a drill hole to pre-wet the coal seam, so that the coal dust generation amount in the mining process can be reduced, in addition, water permeates into the coal seam to destroy the balance of an original coal-coal seam gas two-phase system in the coal seam, a coal-coal seam gas-water three-phase system is formed, and the safety of the mining process is favorably ensured.
However, there are two significant problems with the prior art: 1. the coal seam which is not permeated by water can be generated in the mining process, and a large amount of coal dust can still be generated; 2. for a coal bed with high content of coal bed gas, the existing water injection process is red, so that the effective extraction and utilization of the coal bed gas cannot be realized, and the waste cannot be changed into valuable.
Disclosure of Invention
The invention aims to provide an extraction system for coal seam water injection and coal seam gas extraction, which aims to solve the technical problems that the water energy cannot be judged to completely permeate a coal seam and the extraction efficiency of the coal seam gas in the coal seam is not high in the prior art; the invention also aims to provide an extraction method using the extraction system.
In order to solve the technical problems, the technical scheme of the extraction system for coal seam water injection and coal seam gas extraction in the invention is as follows:
an extraction system for coal seam water injection and coal seam gas extraction comprises a plurality of sampling holes which are arranged on a stope face and the axes of which extend along the front and back direction, at least three extraction holes are evenly distributed on the periphery of each sampling hole,
the coal seam gas extraction device comprises extraction pipes, wherein each extraction hole is internally and externally provided with an extraction inner pipe and an extraction outer pipe, the extraction inner pipe is provided with an inner hole for extracting coal seam gas, a water injection channel is formed between the extraction outer pipe and the extraction inner pipe, a plurality of extraction pipe hole sealers are arranged on the extraction outer pipe at intervals along the front-back direction, a water injection section is formed on the extraction outer pipe and between two corresponding adjacent extraction pipe hole sealers, a water injection port is arranged on the pipe wall of the water injection section, a water injection port valve is arranged at the water injection port, an extraction channel which is communicated with the inner hole of the extraction inner pipe and the outer side of the extraction outer pipe is arranged between the extraction inner pipe and the water injection section, and an extraction channel valve is arranged at each extraction channel;
the sampling pipe is arranged in each sampling hole, a plurality of sampling pipe hole packers are arranged on each sampling pipe at intervals along the front-back direction, a sampling section which is arranged corresponding to the water injection section is formed between every two adjacent sampling pipe hole packers, a plurality of packing strips which extend along the axial direction of each sampling pipe are distributed on each sampling pipe between every two adjacent sampling pipe hole packers along the circumferential direction, each packing strip divides each sampling section into at least three independent sampling intervals which are sequentially arranged along the circumferential direction, the number of the independent sampling intervals of each sampling section corresponds to the number of the extraction holes on the periphery of each sampling hole one by one, each independent sampling interval faces to the corresponding extraction holes on the periphery of each sampling hole, and a humidity sensor is arranged in each independent sampling interval;
the distance between the axis of the sampling hole and the axis of the extraction hole is larger than half of the distance between the axes of two adjacent extraction holes.
The number of the sampling pipe hole packers corresponds to the number of the extraction pipe hole packers one by one, and the axial length of the sampling pipe hole packers is longer than that of the extraction pipe hole packers.
The extraction channel is composed of an inner hole of a radial connecting pipe connected between the extraction inner pipe and the extraction outer pipe.
Be provided with the sampling hole branch wall pipe of outer wall and sampling hole pore wall contact complex in the sampling hole, the sampling pipe sets up in adopting the hole to prop up the wall pipe, and the sampling hole props up the wall pipe and is made by plastics or resin material, has seted up sampling hole on the pipe wall of sampling hole props up the wall pipe and has crossed the water hole.
A sampling hole branch wall pipe is pieced together by at least three sections sampling hole branch wall pipe arc section of jurisdiction that arranges along circumference order, the number of sampling hole branch wall pipe arc section of jurisdiction is the same with the number of packing strip, the contact surface of two adjacent sampling hole branch wall pipe arc sections of jurisdiction sets up along the radial extension of sampling hole branch wall pipe, the contact surface that corresponds two adjacent sampling hole branch wall pipe arc sections of jurisdiction is spaned along circumference respectively to the outer peripheral face of each packing strip, sampling hole branch wall pipe crosses the water hole and opens on the sampling hole branch wall pipe arc section of jurisdiction that corresponds.
The extraction hole is internally provided with an extraction hole branch wall pipe of which the outer wall is in contact fit with the wall of the extraction hole, the extraction pipe is arranged in the extraction hole branch wall pipe and is made of plastic or resin materials, and the pipe wall of the extraction hole branch wall pipe is provided with an extraction hole branch wall pipe water passing hole.
The extraction method for coal seam water injection and coal seam gas extraction in the invention has the technical scheme that:
the method comprises the following steps of firstly, arranging an extraction system on a coal seam; a second step; defining two adjacent water injection sections as a first water injection section and a second water injection section from a stope face from near to far, wherein the two adjacent sampling sections are a first sampling section corresponding to the first water injection section and a second sampling section corresponding to the second water injection section respectively; and repeating the second step to complete water injection of all the water injection sections and coal bed gas suction at the periphery of all the rear water injection sections.
The invention has the beneficial effects that: in the invention, firstly, the coal bed corresponding to the water injection section firstly is injected with water through the water injection port, the water injection port valve on the rear water injection section is closed, the extraction channel valve on the rear water injection section pumps the peripheral space of the rear water injection section, when water leaks to the coal bed at the periphery of the extraction pipe in the water injection process of the front water injection section, when the water leaks to be detected by the humidity sensor of the corresponding independent sampling interval, because the distance between the axis of the sampling hole and the axis of the extraction hole is larger than half of the distance between the axes of the two adjacent extraction holes, the coal bed in the corresponding area is completely permeated by the water, and because the sealing strips divide the sampling section into at least three independent sampling intervals which are sequentially arranged along the circumferential direction, the mutual influence of the water injection sections on the two adjacent extraction pipes is avoided, and the water detected by the corresponding humidity sensor is ensured to be the water permeated towards the corresponding water injection section, therefore, when the humidity sensors in the independent sampling intervals of the same sampling section acquire humidity data, the coal bed in the section is shown to be permeated, and no coal dust is generated in the coal bed mining process in the future; when water is injected into the front water injection section, the rear water injection section realizes negative pressure suction of coal bed gas, the negative pressure suction has the following effects, one is that the water injection pressure difference of the front water injection section can be increased, more efficient water injection is realized, the other is that a drainage guide of the water injection of the front water injection section can be realized, the water injection can be ensured to move forwards, the water injection is prevented from moving towards the direction of a recovery working face to cause pressure waste, along with the forward leakage of rear side water injection, the coal bed gas is insoluble in water, the water can extrude the coal bed gas between coal layers to the region corresponding to the rear water injection section, the negative pressure suction of the region is adopted, on the one hand, the collection and utilization of the coal bed gas in the coal bed are realized, in addition, the coal bed gas content in the coal bed is greatly reduced, and the safety in the mining process is ensured.
Furthermore, for coal seam evacuation, coal seam collapse is easy to occur in drilling, after the sampling hole is drilled, the sampling hole branch wall pipes can be inserted into the sampling hole, the outer diameter of each sampling hole branch wall pipe is matched with the sampling hole, the sampling hole branch wall pipes are spliced by at least three sampling hole branch wall pipe arc-shaped pipe pieces which are sequentially arranged along the circumferential direction, the contact surfaces of the adjacent two sampling hole branch wall pipe arc-shaped pipe pieces are arranged along the radial extension of the sampling hole branch wall pipes, so that the adjacent two sampling hole branch wall pipes can interact to bear the pressure of the surrounding coal seam and avoid the collapse of the sampling hole, and because the sampling hole branch wall pipes are of a plurality of sampling hole branch wall pipe arc-shaped pipe piece structures, when the packer strip and the sampling pipe hole packer are arranged outside, the sampling hole branch wall pipes cannot influence the outward expansion process of the packer strip and the sampling pipe packer, the peripheries of the sampling hole branch wall pipes can be ensured to be in close contact with the inner wall of the sampling hole branch wall pipes, and the peripheries of the packer strip and the sampling pipe packer can be in sealing contact with the inner wall of the sampling hole branch wall pipes, in addition, the outer peripheral surface of the packing strip stretches over the contact surface corresponding to the arc-shaped duct piece of the two adjacent sampling hole branch wall pipes along the circumferential direction, so that a small gap can be generated between the two adjacent sampling hole branch wall pipes after the packing strip and the sampling pipe hole packer expand, but the periphery of the packing strip can seal the gap, and therefore the packing effect of the packing strip and the sampling pipe hole packer is guaranteed.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment 1 of an extraction system for coal seam water injection and coal seam gas extraction in the invention;
FIG. 2 is a side view of FIG. 1;
FIG. 3 is a schematic view of the sampling tube of FIG. 1;
FIG. 4 is a schematic layout of the sampling pipe and the extraction pipe in FIG. 1;
FIG. 5 is a schematic illustration of the extraction tube of FIG. 1;
FIG. 6 is a schematic diagram of the matching of an extraction pipe and an extraction hole in embodiment 2 of the invention;
FIG. 7 is a schematic view showing the fitting of the sampling tube and the sampling hole branch wall tube in example 2.
Detailed Description
An embodiment 1 of an extraction system for coal seam water injection and coal seam gas extraction in the invention is shown in fig. 1-5: the mining device comprises a plurality of sampling holes 7 which are arranged on a stope face 4 and extend along the front-back direction, four extraction holes 2 are uniformly distributed on the periphery of each sampling hole, and the extraction holes 2 and the sampling holes 7 are arranged in parallel.
The coal mine methane mine coal mine. The extraction pipe hole packer 5 is composed of an inflatable rubber bag, belongs to the prior art, and is not detailed herein.
The extraction channel is composed of an inner hole 24 of a radial connecting pipe connected between the extraction inner pipe and the extraction outer pipe, two ends of the radial connecting pipe 25 are respectively connected with the extraction inner pipe 21 and the extraction outer pipe 20 in a welding mode, and the radial connecting pipe not only can be used for extracting coal bed gas, but also plays a role in fixing the distance between the extraction inner pipe and the extraction outer pipe.
A sampling pipe 9 is arranged in each sampling hole 7, a plurality of sampling pipe hole packers 11 are arranged on the sampling pipe at intervals along the front-back direction, a sampling section which is arranged corresponding to a water injection section is formed between every two adjacent sampling pipe hole packers 11, a plurality of packing strips 8 which extend along the axial direction of the sampling pipe are distributed on the sampling pipe between every two adjacent sampling pipe hole packers along the circumferential direction, the two axial ends of each packing strip are respectively in sealing fit with the corresponding sampling pipe hole packers, each packing strip 8 divides the sampling section into four independent sampling sections 12 which are sequentially arranged along the circumferential direction, the number of the independent sampling sections 12 of each sampling section is in one-to-one correspondence with the number of the extraction holes on the periphery of the sampling hole, each independent sampling section respectively faces the corresponding extraction hole on the periphery of the sampling hole, a humidity sensor 10 is arranged in each independent sampling section, when the sampling pipe hole packers and the packing strips are inflated and expanded, the periphery of the sampling pipe hole packers is in sealing fit with the hole wall, the periphery of the sealing strip is in sealing fit with the wall of the sampling hole. The independent sampling space 12 is provided to avoid mutual influence when two adjacent sampling pipes are filled with water, and if no seal strip is provided, data obtained by the humidity sensor cannot be used for judging which direction the water is filled into, so that whether the coal seam is completely filled with water cannot be judged. The structure of the sampling hole packer is similar to that of the extraction hole packer, the sampling hole packer is made of inflatable rubber bags, the axial length of the sampling hole packer is longer than that of the extraction hole packer, and therefore the requirement for the accuracy of the axial installation position errors of the extraction pipe and the sampling pipe can be reduced, and even if the sampling hole packer does not correspond to the corresponding extraction hole packer completely (certain axial position is staggered), as shown in fig. 4, water injection of a corresponding water injection section can only enter the corresponding sampling section and cannot enter an adjacent sampling section on the front side. The excluder strips are also made of inflatable rubber bladders.
The distance between the axis of the sampling hole and the axis of the extraction hole is larger than half of the distance between the axes of the two adjacent extraction holes, a dotted circle in fig. 2 represents a water injection permeation area corresponding to a water injection section, and because the distance between the axis of the sampling hole and the axis of the extraction hole is larger than half of the distance between the axes of the two adjacent extraction holes, when water injection of the two adjacent sampling pipes permeates to the corresponding humidity sensor, the coal seam between the two adjacent sampling pipes is completely permeated.
In other embodiments of the invention: the number of the extraction holes at the periphery of each sampling hole can be three, five or other numbers.
An embodiment 2 of an extraction system for coal seam water injection and coal seam gas extraction is shown in fig. 6-7, embodiment 2 is different from embodiment 1 in that it is applied to a soft coal seam 1, hole collapse easily occurs after drilling, therefore, in this embodiment, a sampling hole branch wall pipe 30 with an outer wall in contact fit with a wall of a sampling hole is arranged in the sampling hole, a sampling pipe 9 is arranged in the sampling hole branch wall pipe 30, the sampling hole branch wall pipe 30 is made of plastic or resin material, a sampling hole branch wall pipe water passing hole arranged corresponding to an independent sampling area is arranged on a pipe wall of the sampling hole branch wall pipe, an outer pipe wall of the sampling hole branch wall pipe is in contact fit with the coal seam, and a sampling hole packer 11 and a packing strip are expanded and then directly in seal fit with an inner pipe wall of the sampling hole branch wall pipe.
The sampling hole branch wall pipe 30 is pieced together by four lamella sampling hole branch wall pipe arc section of jurisdiction 40 that arranges along circumference order, the number of sampling hole branch wall pipe arc section of jurisdiction 40 is the same with the number of division bar 8, the contact surface 41 of two adjacent sampling hole branch wall pipe arc section of jurisdiction sets up along the radial extension of sampling hole branch wall pipe, each outer peripheral face of division bar 8 spanes the contact surface 41 that corresponds two adjacent sampling hole branch wall pipe arc section of jurisdiction along circumference respectively, the sampling hole branch wall pipe crosses the water hole and opens on the sampling hole branch wall pipe arc section of jurisdiction 40 that corresponds. The sampling hole branch wall pipe is formed by splicing a plurality of sampling hole branch wall pipe arc-shaped pipe sheets 40 which are sequentially arranged along the circumferential direction, thus, the sampling hole branch wall pipe can play a role in supporting the surrounding coal seam when the sampling pipe is not inserted, so as to avoid the collapse of the sampling hole, after the sampling pipe is inserted, no restriction is caused to the expansion of the sampling pipe hole packer 11 and the packer strip 8, when the sampling pipe hole packer and the packing strip expand outwards, small gaps can be generated between the arc-shaped pipe pieces of the branch wall pipes of the adjacent sampling holes, because the outer diameter of the sampling hole branch wall pipe is matched with the inner diameter of the sampling hole, the gap is not too large, the width of the gap is within 1cm, the width of the sealing and separating strip is between 8cm and 15cm, the periphery of the sealing and separating strip can complete the sealing of the gap, thereby avoid the water in sampling hole branch wall pipe periphery coal seam to influence adjacent independent sampling space through this gap, seted up sampling hole branch wall pipe on the sampling hole branch wall pipe arc tube sheet between the adjacent seal parting bead and crossed water hole 42.
And similarly, an extraction hole branch wall pipe 31 with the outer wall in contact fit with the wall of the extraction hole is arranged in the extraction hole, the extraction pipe 3 is arranged in the extraction hole branch wall pipe and is made of plastic or resin materials, an extraction hole branch wall pipe water passing hole is formed in the pipe wall of the extraction hole branch wall pipe, and the extraction hole packer 5 is directly in sealing fit with the inner wall of the extraction hole branch wall pipe after being expanded. After water injection and coal bed gas extraction are completed, the sampling hole branch wall pipe and the extraction hole branch wall pipe can be taken out, a drill bit directly carries out extraction drilling on an extraction working face, the branch wall pipe made of plastic or resin materials can be drilled and crushed, and then screening is carried out.
An embodiment of a method for coal seam water injection, coal seam gas extraction and extraction is shown in fig. 1-7: arranging an extraction system on the coal seam, wherein the specific structure of the extraction system is the same as that of the embodiments of the extraction systems, and the detailed description is omitted; a second step; defining two adjacent water injection sections as a first water injection section and a second water injection section from a stope face from near to far, wherein the two adjacent sampling sections are a first sampling section corresponding to the first water injection section and a second sampling section corresponding to the second water injection section respectively; and repeating the second step to complete water injection of all the water injection sections and coal bed gas suction at the periphery of all the rear water injection sections. That is to say, the whole water injection, coal bed gas take out and adopt the process that two adjacent water injection sections work simultaneously, water injection of water injection section earlier, back water injection section is bled, accomplish water injection, the operation of bleeding of each water injection section in proper order, when water injection of water injection section earlier, with the coal bed gas in the coal seam that water injection section corresponds earlier towards the water injection section of back forcing, under the pressure differential environment of positive negative pressure, the infiltration ability of water is stronger, the flow direction nature of its rivers is stronger, the coal bed gas in coal seam 1 is extruded more easily.
The water injection and coal bed gas of sectional type are taken out and are taken out like this, can realize the thorough water injection in coal seam on the one hand, also can realize in addition the high-efficient extraction to coal bed gas, when reducing coal bed gas content in the coal seam, the coal bed gas of suction can also be used for other effects.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. The utility model provides a take out and adopt system for coal seam water injection, coal bed gas are taken out and adopt which characterized in that: comprises a plurality of sampling holes which are arranged on a stope face and the axes of which extend along the front and back direction, at least three extraction holes are evenly distributed on the periphery of each sampling hole,
the coal seam gas extraction device comprises extraction pipes, wherein each extraction hole is internally and externally provided with an extraction inner pipe and an extraction outer pipe, the extraction inner pipe is provided with an inner hole for extracting coal seam gas, a water injection channel is formed between the extraction outer pipe and the extraction inner pipe, a plurality of extraction pipe hole sealers are arranged on the extraction outer pipe at intervals along the front-back direction, a water injection section is formed on the extraction outer pipe and between two corresponding adjacent extraction pipe hole sealers, a water injection port is arranged on the pipe wall of the water injection section, a water injection port valve is arranged at the water injection port, an extraction channel which is communicated with the inner hole of the extraction inner pipe and the outer side of the extraction outer pipe is arranged between the extraction inner pipe and the water injection section, and an extraction channel valve is arranged at each extraction channel;
the sampling pipe is arranged in each sampling hole, a plurality of sampling pipe hole packers are arranged on each sampling pipe at intervals along the front-back direction, a sampling section which is arranged corresponding to the water injection section is formed between every two adjacent sampling pipe hole packers, a plurality of packing strips which extend along the axial direction of each sampling pipe are distributed on each sampling pipe between every two adjacent sampling pipe hole packers along the circumferential direction, each packing strip divides each sampling section into at least three independent sampling intervals which are sequentially arranged along the circumferential direction, the number of the independent sampling intervals of each sampling section corresponds to the number of the extraction holes on the periphery of each sampling hole one by one, each independent sampling interval faces to the corresponding extraction holes on the periphery of each sampling hole, and a humidity sensor is arranged in each independent sampling interval;
the distance between the axis of the sampling hole and the axis of the extraction hole is larger than half of the distance between the axes of two adjacent extraction holes.
2. The extraction system for coal seam water injection and coal seam gas extraction according to claim 1, characterized in that: the number of the sampling pipe hole packers corresponds to the number of the extraction pipe hole packers one by one, and the axial length of the sampling pipe hole packers is longer than that of the extraction pipe hole packers.
3. The extraction system for coal seam water injection and coal seam gas extraction according to claim 1, characterized in that: the extraction channel is composed of an inner hole of a radial connecting pipe connected between the extraction inner pipe and the extraction outer pipe.
4. The extraction system for coal seam water injection and coal seam gas extraction according to claim 1, characterized in that: be provided with the sampling hole branch wall pipe of outer wall and sampling hole pore wall contact complex in the sampling hole, the sampling pipe sets up in adopting the hole to prop up the wall pipe, and the sampling hole props up the wall pipe and is made by plastics or resin material, has seted up sampling hole on the pipe wall of sampling hole props up the wall pipe and has crossed the water hole.
5. The extraction system for coal seam water injection and coal seam gas extraction according to claim 4, characterized in that: a sampling hole branch wall pipe is pieced together by at least three sections sampling hole branch wall pipe arc section of jurisdiction that arranges along circumference order, the number of sampling hole branch wall pipe arc section of jurisdiction is the same with the number of packing strip, the contact surface of two adjacent sampling hole branch wall pipe arc sections of jurisdiction sets up along the radial extension of sampling hole branch wall pipe, the contact surface that corresponds two adjacent sampling hole branch wall pipe arc sections of jurisdiction is spaned along circumference respectively to the outer peripheral face of each packing strip, sampling hole branch wall pipe crosses the water hole and opens on the sampling hole branch wall pipe arc section of jurisdiction that corresponds.
6. The extraction system for coal seam water injection and coal seam gas extraction according to any one of claims 1 to 5, characterized in that: the extraction hole is internally provided with an extraction hole branch wall pipe of which the outer wall is in contact fit with the wall of the extraction hole, the extraction pipe is arranged in the extraction hole branch wall pipe and is made of plastic or resin materials, and the pipe wall of the extraction hole branch wall pipe is provided with an extraction hole branch wall pipe water passing hole.
7. An extraction method using the extraction system of any one of claims 1 to 6, characterized by: the method comprises the following steps of firstly, arranging an extraction system on a coal seam; a second step; defining two adjacent water injection sections as a first water injection section and a second water injection section from a stope face from near to far, wherein the two adjacent sampling sections are a first sampling section corresponding to the first water injection section and a second sampling section corresponding to the second water injection section respectively; and repeating the second step to complete water injection of all the water injection sections and coal bed gas suction at the periphery of all the rear water injection sections.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110663235.9A CN113279737B (en) | 2021-06-15 | 2021-06-15 | Extraction system and extraction method for coal seam water injection and coal seam gas extraction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110663235.9A CN113279737B (en) | 2021-06-15 | 2021-06-15 | Extraction system and extraction method for coal seam water injection and coal seam gas extraction |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113279737A true CN113279737A (en) | 2021-08-20 |
| CN113279737B CN113279737B (en) | 2022-11-15 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105510396A (en) * | 2015-11-24 | 2016-04-20 | 山东科技大学 | Device and method for testing wetting range of coal seam water injection |
| CN106703871A (en) * | 2017-02-06 | 2017-05-24 | 华北科技学院 | Method of using high-pressure water injection to prevent and treat gas coal dust |
| CN109098750A (en) * | 2018-09-20 | 2018-12-28 | 中国矿业大学 | A kind of underground gas extraction hole doubles as the device and construction method in coal-bed flooding hole |
| WO2019196503A1 (en) * | 2018-04-12 | 2019-10-17 | 山东科技大学 | Drilling machine power-based downhole rapid slotting directional hydraulic fracturing system and method |
| CN111963155A (en) * | 2020-08-19 | 2020-11-20 | 山东科技大学 | Coal seam water injection wetting range detection device, detection method and homogenization method |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105510396A (en) * | 2015-11-24 | 2016-04-20 | 山东科技大学 | Device and method for testing wetting range of coal seam water injection |
| CN106703871A (en) * | 2017-02-06 | 2017-05-24 | 华北科技学院 | Method of using high-pressure water injection to prevent and treat gas coal dust |
| WO2019196503A1 (en) * | 2018-04-12 | 2019-10-17 | 山东科技大学 | Drilling machine power-based downhole rapid slotting directional hydraulic fracturing system and method |
| CN109098750A (en) * | 2018-09-20 | 2018-12-28 | 中国矿业大学 | A kind of underground gas extraction hole doubles as the device and construction method in coal-bed flooding hole |
| CN111963155A (en) * | 2020-08-19 | 2020-11-20 | 山东科技大学 | Coal seam water injection wetting range detection device, detection method and homogenization method |
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