CN113279737B - 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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- 238000000605 extraction Methods 0.000 title claims abstract description 182
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 146
- 238000002347 injection Methods 0.000 title claims abstract description 116
- 239000007924 injection Substances 0.000 title claims abstract description 116
- 239000003245 coal Substances 0.000 title claims abstract description 109
- 238000005070 sampling Methods 0.000 claims abstract description 187
- 238000000034 method Methods 0.000 claims abstract description 16
- 238000012856 packing Methods 0.000 claims description 23
- 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 6
- 230000004323 axial length Effects 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- 230000035515 penetration Effects 0.000 abstract 1
- 238000005065 mining Methods 0.000 description 15
- 239000002817 coal dust Substances 0.000 description 6
- 238000007789 sealing Methods 0.000 description 6
- 238000005086 pumping Methods 0.000 description 5
- 241000446313 Lamella Species 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
- 239000012466 permeate Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 230000000694 effects 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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- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
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- General Life Sciences & Earth Sciences (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 complete penetration of the water energy into the coal bed cannot be judged and the extraction efficiency of the coal bed gas in the coal bed is not high in the prior art.
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, a roadway is firstly opened to enter a far place of a planned mining area for safety generally from left to right, a working face in formal mining is called a stope face, and then mining is carried out from back to front along the stope face. 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 extraction system for coal seam water injection and coal seam gas extraction has the technical scheme 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 the 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 the sampling pipe are distributed on the sampling pipe between every two adjacent sampling pipe hole packers along the circumferential direction, the packing strips divide the 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 at the periphery of the sampling hole one by one, each independent sampling interval faces the corresponding extraction hole at the periphery of the 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 branch wall pipe of sample hole is pieced together by at least three lamella branch wall pipe arc section of jurisdiction of sample hole that arranges along circumference order, the number of a branch wall pipe arc section of sample hole is the same with the number of packing strip, the contact surface of a branch wall pipe arc section of adjacent two sample hole sets up along the radial extension of a branch wall pipe of sample hole, the outer peripheral face of each packing strip spanes the contact surface that corresponds two adjacent branch wall pipe arc sections of sample hole respectively along circumference, a branch wall pipe of sample hole crosses the water hole and sets up on the branch wall pipe arc section of sample hole that corresponds.
And an extraction hole branch wall pipe of which the outer wall is in contact fit with the wall of the extraction hole is arranged in the extraction hole, the extraction pipe is arranged in the extraction hole branch wall pipe, the extraction hole branch wall pipe 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 that firstly, an 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 invention has the beneficial effects that: according to the method, firstly, water is injected into a coal seam corresponding to a first water injection section through a water injection port, a water injection port valve on a rear water injection section is closed, a pumping channel valve on the rear water injection section pumps a space on the periphery of the rear water injection section, when water leaks into the coal seam on the periphery of a pumping pipe in the water injection process of the first water injection section, and when the water leaks to a humidity sensor in a corresponding independent sampling interval, because the distance between the axis of a sampling hole and the axis of the pumping hole is larger than half of the distance between the axes of two adjacent pumping holes, the coal seam in the corresponding area is completely permeated by the water, and because a sealing strip divides 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 pumping pipes is avoided, the water detected by the corresponding humidity sensor is the water permeated towards the corresponding water injection section, so that the coal seam is permeated when the humidity sensors in the independent sampling intervals in the same sampling section acquire data, the coal seam dust is ensured, and no coal seam dust is generated in the mining process; 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.
Further, to the coal seam evacuation, the coal seam that easily sinks is driped, after the sampling hole drilling, can insert sampling hole branch wall pipe in the sampling hole, the external diameter and the sampling hole matching of sampling hole branch wall pipe, sampling hole branch wall pipe is pieced together along the sampling hole branch wall pipe arc section of pipe that circumference order was arranged by at least three lamella, the contact surface of two adjacent sampling hole branch wall pipe arc section of pipe sets up along the radial extension of sampling hole branch wall pipe, two adjacent sampling hole branch wall pipes can interact like this, thereby undertake the pressure of coal seam around, avoid the sampling hole to sink, and because sampling hole branch wall pipe is a plurality of sampling hole branch wall pipe arc section of pipe structures, consequently when packer strip and sampling pipe packer outer, sampling hole branch wall pipe can not lead to the fact the influence to the outer inflation process of packer strip and sampling pipe packer pipe, guarantee that the periphery of sampling hole branch wall pipe can with the inseparable contact of coal seam, packer strip and sampling pipe packer's periphery then with the inner wall sealing contact cooperation of sampling hole branch wall pipe, in addition, the periphery of two adjacent sampling hole branch wall pipe seals the gap that the gap can be guaranteed, thereby two adjacent sampling hole seals the gap that the peripheral sealing strip and the adjacent sampling pipe gap can be produced.
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 present invention is shown in fig. 1 to 5: the sampling device comprises a plurality of sampling holes 7 which are arranged on a stope face 4 and the axes of which extend along the front-back direction, wherein 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 extraction pipes 3 are arranged in the extraction holes 2, each extraction pipe 3 comprises an inner extraction pipe 21 and an outer extraction pipe 20 which are arranged inside and outside, the inner extraction pipe 21 is provided with an inner hole 28 for extracting coal bed gas, a water injection channel 22 is formed between the outer extraction pipe 20 and the inner extraction pipe 21, a plurality of extraction pipe hole sealing devices 5 are arranged on the outer extraction pipe at intervals along the front-back direction, a water injection section is formed between the corresponding adjacent extraction pipe hole sealing devices on the extraction outer pipe, a water injection port 23 is formed in the pipe wall of the water injection section, a water injection port valve is arranged at the position of the water injection port 23, extraction channels which are communicated with the outer side of the extraction outer pipe and the inner hole of the extraction inner pipe are arranged between the extraction inner pipe and the water injection section, and extraction channel valves are arranged at the positions of the extraction channels. 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.
All be provided with sampling pipe 9 in each sampling hole 7, sampling pipe is last along the fore-and-aft direction interval arrangement has a plurality of sampling pipe hole packings 11, form the sampling section that corresponds the setting with the water injection section between two adjacent sampling pipe hole packings 11, it has a plurality of packing strip 8 along the axial extension of sampling pipe to distribute along circumference on the sampling pipe between two adjacent sampling pipe hole packings, the axial both ends of packing strip respectively with correspond sampling pipe hole packings sealed fit, packing strip 8 separates the sampling section into four independent sampling interval 12 along circumference order setting, the number of independent sampling interval 12 of every sampling section corresponds with the number one-to-one of the peripheral extraction hole of sampling hole, and each independent sampling interval is respectively towards the peripheral corresponding extraction hole of sampling hole, all be provided with humidity transducer 10 in each independent sampling interval, when sampling pipe hole packings and sampling strip inflation, the periphery and the hole pore wall sealed cooperation of sampling pipe hole, the periphery and the sealed cooperation of packing strip. 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 and the extraction hole packer are both made of inflatable rubber bags, the sampling hole packer is different from the extraction hole packer, the axial length of the sampling hole packer is longer than that of the extraction hole packer, and therefore the requirement for the error precision of the axial installation positions of an extraction pipe and a sampling pipe can be reduced, and even if the sampling hole packer and the corresponding extraction hole packer do not correspond to each other completely (stagger by a certain axial position), as shown in fig. 4, water injection of a corresponding water injection section can be guaranteed to enter only the corresponding sampling section and cannot enter an adjacent sampling section on the front side. The closure strip is also made of an inflatable rubber bladder.
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 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, so that when water injection of the two adjacent sampling pipes permeates to the corresponding humidity sensor, the coal bed 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 to 7, and the embodiment 2 is different from the embodiment 1 in that the extraction system is applied to a soft coal seam 1, and hole collapse easily occurs after drilling, so in this embodiment, a sampling hole branch wall pipe 30 is provided in a sampling hole, an outer wall of the sampling hole branch wall pipe is in contact fit with a wall of 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 formed in 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 spliced by a plurality of sampling hole branch wall pipe arc-shaped pipe pieces 40 which are sequentially arranged along the circumferential direction, so that the sampling hole branch wall pipe can play a role in supporting a surrounding coal bed when the sampling pipe is not inserted, collapse of the sampling hole is avoided, after the sampling pipe is inserted, no constraint is caused on expansion of the sampling pipe hole packer 11 and the packing strip 8, when the sampling pipe hole packer and the packing strip expand outwards, a small gap can be generated between the adjacent sampling hole branch wall pipe arc-shaped pipe pieces, because the outer diameter of the sampling hole branch wall pipe is matched with the inner diameter of the sampling hole, the gap cannot be too large, the gap width is within 1cm, the width of the packing strip is 8cm to 15cm, the periphery of the packing strip can be sealed for the gap, and therefore, the influence on the adjacent independent sampling space caused by water passing through the gap on the sampling hole branch wall pipe arc-shaped pipe outer periphery is avoided, and the sampling hole water passing hole 42 is formed on the sampling hole branch wall pipe arc-shaped pipe piece between the adjacent packing strip.
And in the same way, 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 to 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 outer wall in the sampling hole and contact complex sampling hole branch wall pipe with the sampling hole pore wall, the sampling pipe sets up in adopting the hole to prop up the wall pipe, and the branch wall pipe of sampling hole is made by plastics or resin material, has seted up the sampling hole on the pipe wall of the branch wall pipe of sampling hole and has propped up the wall pipe and 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 according to any one of claims 1 to 6, characterized by comprising: 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)
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| 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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|---|---|---|---|---|
| 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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