CN117404062A - Water injection device and water injection method for coal mining gas extraction matching - Google Patents

Abstract

The invention relates to a water injection device matched with gas extraction in coal exploitation, which comprises a sampling pipe and a sampling pipe, wherein a sampling section is arranged on the sampling pipe, the sampling section comprises a sampling outer pipe, a plurality of sampling outer pipe water inlets are circumferentially distributed on the sampling outer pipe, the sampling section also comprises a sampling inner pipe coaxially fixed on the inner side of the sampling outer pipe, a first partition plate and a second partition plate radially extending along the sampling inner pipe are coaxially and rotatably arranged on the sampling inner pipe, the first partition plate and the second partition plate are respectively driven by respective corresponding partition plate driving mechanisms, a first humidity sensor is arranged between the first partition plate and the second partition plate, a second humidity sensor is arranged on the outer sides of the first partition plate and the second partition plate, and a partition plate air bag used for being in sealing fit with the inner wall of the sampling outer pipe is arranged at the outer ends of the first partition plate and the second partition plate. The water injection device solves the technical problem that the water injection device in the prior art cannot accurately judge when the coal bed is soaked by water.

Description

Water injection device and water injection method for coal mining gas extraction matching

Technical Field

The invention relates to the field of coal exploitation, in particular to a water injection device and a water injection method for coal exploitation gas extraction matching.

Background

Before coal exploitation, gas in a coal bed needs to be extracted in advance as much as possible, and during gas extraction, water injection operation of the coal bed needs to be carried out in a matched mode, and the purpose of the water injection operation is to wet the coal bed on one hand, so that dust in the subsequent coal bed drilling and extraction process is reduced conveniently; on the other hand, the water occupies the coal seam gap, so that the gas is directionally extruded, and the gas is smoothly extracted.

For how to realize the cooperation of water injection and gas extraction, we have conducted intensive research in this regard all the time, for example, "a wall supporting pipe for coal seam drilling and a coal seam gas extraction system using the same" disclosed in chinese patent CN113279706B, in which various kinds of extraction systems need to drill sampling holes on a stoping face, at least three extraction holes are distributed around the sampling holes, extraction pipes are provided in the extraction holes, sampling pipes are provided in the sampling holes, extraction hole wall supporting pipes are provided between the extraction holes and the extraction pipes, and sampling hole wall supporting pipes are provided between the sampling holes and the sampling pipes.

The sampling pipe is provided with a water injection section, a plurality of sampling pipe hole sealing devices are arranged on the sampling pipe at intervals along the front-back direction, sampling sections which are arranged corresponding to the water injection section are formed between two adjacent sampling pipe hole sealing devices, a plurality of partition strips which extend along the axial direction of the sampling pipe are distributed on the sampling pipe between the two adjacent sampling pipe hole sealing devices along the circumferential direction, the partition strips divide the sampling section into at least three independent sampling sections which are arranged along the circumferential direction in sequence, radial water permeable holes on each arc-shaped pipe piece of the sampling hole support arm pipe are respectively corresponding to the independent sampling sections, the number of independent sampling sections of each sampling section is in one-to-one correspondence with the number of sampling holes on the periphery of the sampling hole, and each independent sampling section is respectively towards the corresponding sampling hole on the periphery of the sampling hole, and humidity sensors are arranged in each independent sampling section.

When the coal seam is injected with water, one working difficulty is the water injection moment, and how to judge that the coal seam is soaked by the water injection layer is critical, in order to judge when water is soaked by the coal seam in the prior art, the water injection section of the extraction pipe at the periphery of the sampling pipe is injected with water simultaneously, in theory, the water injected by the water injection section uniformly diffuses at a constant speed towards the periphery of the extraction pipe by taking the extraction pipe as the middle, and when humidity sensors of all independent sampling areas on the sampling pipe sample humidity changes, the water injected by the water injection section is demonstrated to reach the corresponding independent sampling areas, so that the water is judged to be soaked by the corresponding coal seam. However, in practice, it has been found that, by such water injection in the prior art, it is also possible that some coal seams are dry and that such coal seams are not saturated.

The reason for this problem is found by research that the void ratio and the position of each position of the coal seam are different, when water flows out from the water injection section of the sampling pipe, the water on each sampling pipe is not uniformly diffused outwards (the water injection diffusion path is also very diversified), for example, the water is injected into the sampling pipe at the upper right corner of the sampling pipe, and may enter into the independent sampling area at the lower right corner of the sampling pipe, and at this time, the humidity sensor at the lower right corner of the sampling pipe can also detect the humidity change signal, but the water injection of the sampling pipe at the lower right corner of the sampling pipe does not completely infiltrate the coal seam at the lower right corner area of the sampling pipe. Therefore, the water injection mode in the prior art cannot ensure that the coal seam is completely soaked, so that the gas cannot be completely extruded in a directional manner, and the gas cannot be completely extracted; the dust raising problem during subsequent coal seam drilling cannot be guaranteed.

Disclosure of Invention

The invention aims to provide a water injection device matched with gas extraction in coal exploitation, so as to solve the technical problem that the water injection device in the prior art cannot accurately judge when a coal bed is soaked by water; the invention also aims to provide a water injection method using the water injection device matched with coal mining gas extraction.

In order to solve the technical problems, the technical scheme of the water injection device matched with coal mining gas extraction in the invention is as follows:

the utility model provides a supporting water injection device that uses of coal exploitation gas extraction, includes the axis along the sampling pipe that left and right sides orientation extends and four evenly distributed in sampling pipe peripheral take out and be provided with a plurality of water injection section that set up along left and right sides orientation order on the sampling pipe, be provided with a plurality of sampling sections that correspond the setting with the water injection section on the sampling pipe, the sampling section includes the outer tube of periphery and sampling hole's pore wall contact complex sampling, there are a plurality of sampling outer tube water inlets on the sampling outer tube along circumference distribution, the sampling section still includes the coaxial line and is fixed in the inboard sampling inner tube of sampling outer tube, coaxial line rotation on the sampling inner tube is equipped with along the first baffle and the second baffle of sampling inner tube radial extension, first baffle, the second baffle is adjustable by the interval and first baffle between the second baffle relative sampling inner tube of respective corresponding baffle drive mechanism respectively, be provided with first humidity transducer between first baffle, the second baffle, the outside of second baffle is provided with second humidity transducer, the outer side of first baffle, the outer end of first baffle is provided with the second humidity transducer, the outer tube of first baffle, the outer tube of second baffle is formed between the first baffle and the sealed baffle.

Further, the sampling section also comprises a fan, and the fan is connected with the sampling space through a hose.

Further, the sampling outer tube comprises an outer tube and an inner tube arranged on the inner side of the outer tube in a coaxial line, an annular space between the inner tube and the outer tube is divided into a plurality of separation cavities which are sequentially arranged along the circumferential direction by a plurality of outer tube partition plates distributed along the circumferential direction, water absorption sponges are arranged in each separation cavity, a water inlet of the sampling outer tube is formed in the inner tube and the outer tube on the inner side and the outer side of the separation cavity, and the partition plate air bags are in contact sealing fit with the inner wall of the inner tube.

Further, the inner cavity of the sampling pipe section is divided into a device room and a sampling room which are arranged left and right by pipe section partition boards, a partition board driving mechanism and a fan are arranged in the device room, and a first partition board and a second partition board are arranged in the sampling room.

Further, the outer turnover of sampling inner tube is overlapped and is equipped with first rotation cover and second rotation cover, and first baffle is fixed in first rotation and sheathes in, and the second baffle is fixed in the second and is sheathes in, and first rotation is sheathes in and is offered along first rotation cover circumference extension's rotation cover guiding hole, and second rotation cover circumference is kept away from the one end of second baffle and is rotated the cover guiding hole direction and remove the cooperation.

Further, the left end of the sampling inner tube is fixedly arranged in the equipment room, the baffle driving mechanism comprises a first motor and a second motor which are fixed at the left end of the sampling inner tube, the left end of the first rotating sleeve stretches into the equipment room, the left end of the second rotating sleeve stretches into the equipment room, the left end of the first rotating sleeve is fixedly provided with a first transmission gear ring, the left end of the second rotating sleeve is fixedly provided with a second transmission gear ring, a first gear meshed with the first transmission gear ring is fixed on a motor shaft of the first motor, and a second gear meshed with the second transmission gear ring is fixed on a motor shaft of the second motor.

The water injection method has the technical scheme that:

the four extraction pipes defining the periphery of the sampling pipe are respectively a first extraction pipe, a second extraction pipe, a third extraction pipe and a fourth extraction pipe in sequence along the circumferential direction, the space outside the sampling inner pipe is defined into a first quadrant corresponding to the first extraction pipe, a second quadrant corresponding to the second extraction pipe, a third quadrant corresponding to the third extraction pipe and a fourth quadrant opposite to the fourth extraction pipe, the central angle of each quadrant is 90 degrees, the origin of coordinates of each quadrant is positioned on the axis of the sampling pipe,

the first step, the water injection section of the first extraction pipe works to set water injection pressure to inject water to the surrounding coal seam until the humidity sensor corresponding to the sampling section samples a humidity signal, the water injection operation of the water injection section of the first extraction pipe is stopped, and the water injection duration T is recorded ₁ ，

Step two, finding out the inlet through the relative distance adjustment and circumferential position adjustment of the first baffle plate and the second baffle platePerforming a third step if the circumferential area spanned by the water inlet of the sampling outer tube for water is not smaller than the circumferential area corresponding to the water inlet of the sampling tube corresponding to the first quadrant; if the circumferential area spanned by the water inlet of the sampling tube is smaller than the circumferential area corresponding to the water inlet of the sampling tube corresponding to the first quadrant, the water injection section of the first extraction tube is restarted until the circumferential area spanned by the water inlet of the sampling tube is not smaller than the circumferential area corresponding to the water inlet of the sampling tube corresponding to the first quadrant, and the water injection time length T of the section is recorded ₂ ；

Thirdly, after the space between the sampling inner pipe and the sampling outer pipe is dried, the water injection section of the second extraction pipe works, and the first step and the second step are repeated;

fourth, repeating the third step to finish the operation of the water injection sections of the third extraction pipe and the fourth extraction pipe, thereby obtaining the water injection time required by the independent operation of the water injection sections of the extraction pipes;

and fifthly, the water injection section of each extraction pipe simultaneously completes water injection to the surrounding coal seam in the water injection time length obtained in the previous four steps.

The beneficial effects of the invention are as follows: the invention is characterized in that, firstly, each extraction pipe is required to work sequentially, the water seepage time of the water injection section of each extraction pipe is judged, the water seepage area of each water injection section is judged through the cooperation of the relative distance and the circumferential position change of the first partition plate and the second partition plate and the first humidity sensor and the second humidity sensor, when the water seepage area covers the circumferential area corresponding to the water inlet of the sampling pipe corresponding to the first quadrant, the water injection section of the extraction pipe in the corresponding position can realize the total water injection of the coal seam in the corresponding position after the corresponding water injection time length; the time length required by the whole water injection of the coal seam in the corresponding azimuth is measured through the sequential independent work of the extraction pipes in each range, so that the water injection section of the extraction pipe in the corresponding azimuth works to meet the corresponding time length, and the coal seam in each azimuth can be soaked by water.

Drawings

The above, as well as additional purposes, features, and advantages of exemplary embodiments of the present disclosure will become readily apparent from the following detailed description when read in conjunction with the accompanying drawings. Several embodiments of the present disclosure are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings and in which like reference numerals refer to like or corresponding parts and in which:

FIG. 1 is a schematic diagram of the operation of one embodiment of a water injection device in a water injection method of the present invention;

FIG. 2 is a schematic view of the structure of the sampling tube of FIG. 1;

FIG. 3 is a cross-sectional view taken along A-A of FIG. 2;

FIG. 4 is a schematic view showing a state change of the first and second separators in FIG. 2;

FIG. 5 is a schematic diagram of the structure of a single sampling segment of FIG. 3;

reference numerals illustrate: 1. stoping the working face; 2. a sampling tube; 3. a drainage pipe; 4. a first quadrant; 5. a second quadrant; 3. a third quadrant; 4. a fourth quadrant; 5. a first extraction pipe; 6. the second extraction pipe; 7. a third extraction pipe; 8. a fourth extraction pipe; 9. the water injection area of the first extraction pipe; 10. an outer tube; 11. an inner layer outer tube; 12. an outer tube separator; 13. a separation chamber; 14. sampling an outer tube water filling port; 15. sampling an inner tube; 16. a first separator; 17. a second separator; 18. a first rotating sleeve; 19. a second rotating sleeve; 20. a first humidity sensor; 21. a second humidity sensor; 22. a diaphragm air bag; 23. a sampling section; 24. a blower; 25. a first motor; 26. a second motor; 27. a first gear; 28. a second gear; 29. a first drive ring gear; 30. a second drive ring gear; 31. a sampling section baffle; 32. a pipe section separator; 33. sampling; 34. inter-device.

Detailed Description

In order that the invention may be readily understood, a more particular description thereof will be rendered by reference to specific embodiments that are illustrated in the appended drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

The embodiment of the water injection device matched with coal mining gas extraction in the invention is shown in fig. 1-4: the water injection device comprises a plurality of water injection units, each water injection unit comprises a sampling pipe 2 and extraction pipes 3 uniformly distributed on the periphery of the sampling pipe at intervals along the circumferential direction, as shown in fig. 1, the axes of the extraction pipes 3 and the sampling pipes 2 are all arranged along the left-right direction, a plurality of water injection sections sequentially arranged along the left-right direction are arranged on the extraction pipes 3, water can be injected into coal beds corresponding to the periphery of the extraction pipes through the water injection sections, and water can be discharged from the extraction pipes from inside to outside along the radial direction. The extraction pipe can be the extraction pipe in the prior art, namely, the extraction pipe is the same as the extraction pipe in the support wall pipe for coal seam drilling and the coal seam gas extraction system using the support wall pipe with the publication number of CN113279706B and the application name of CN113279706B, and the details are not described here.

The main innovation of the invention is the structure of the sampling tube and the water injection method.

The sampling pipe 2 is provided with a plurality of sampling sections 23 which are arranged corresponding to the water injection sections, each sampling section 23 is arranged in sequence along the left-right direction, adjacent sampling sections are separated by a sampling section baffle 31, the inner cavity of each sampling section is separated into a device room 34 and a sampling room 33 by the pipe section baffle, and the axial length of the device room 34 is smaller than that of the sampling room.

The sampling section includes the outer tube of the hole wall contact complex of periphery and sampling hole, and it has a plurality of outer tube water inlets 14 to sample to distribute along circumference on the outer tube of sampling, and the sampling section still includes the coaxial line setting in the inboard inner tube 15 of sampling of outer tube, and the tip of inner tube 15 of sampling is fixed in on the section baffle 31 of corresponding sampling. The sampling inner tube is rotatably provided with a first partition plate 16 and a second partition plate 17 which are arranged along the radial extension of the sampling inner tube, that is to say, the extension directions of the inner ends of the first partition plate 16 and the second partition plate 17 are intersected on the axis of the sampling inner tube, the first partition plate and the second partition plate are respectively driven by respective corresponding partition plate driving mechanisms so that the distance between the first partition plate and the second partition plate and the circumferential positions of the first partition plate and the second partition plate relative to the sampling inner tube are adjustable, a first humidity sensor 20 is arranged between the first partition plate and the second partition plate, a second humidity sensor 21 is arranged on the circumferential outer sides of the first partition plate and the second partition plate, and in the embodiment, the first humidity sensor and the second humidity sensor are fixed on the two opposite side plate surfaces of the first partition plate. A fan-shaped sampling space is formed between the first partition plates.

The outer end of first baffle, second baffle is provided with and is used for with sampling outer tube inner wall sealing fit's baffle gasbag 22, baffle gasbag 22 is the strip structure that length along controlling the direction, when the baffle gasbag was inflated, baffle gasbag inflation, baffle gasbag periphery can with sampling outer tube inner wall contact sealing fit, when the baffle gasbag is out of charge, the periphery of baffle gasbag breaks away from with sampling outer tube inner wall, first baffle can relative rotation, the looks back of body rotates or syntropy rotates, in fig. 2, the baffle gasbag is in the uninflated state, moisture can circulate in sampling space i.e. sampling space's circumference both sides this moment.

A fan 24 is arranged in the equipment room, an air inlet of the fan is connected with the sampling space through a hose, specifically, one end of the hose is connected with the air inlet of the fan, and the other end of the hose is connected to the first partition board. The air outlet of the fan is provided with a drying box. The sampling inner tube is provided with an exhaust port, and the gas exhausted by the drying box can be exhausted through the sampling inner tube.

The sampling outer tube comprises an outer tube 10 and an inner tube 11 coaxially arranged on the inner side of the outer tube 10, an annular space between the inner tube 11 and the outer tube 10 is divided into a plurality of separation cavities 13 sequentially arranged along the circumferential direction by a plurality of outer tube partition plates 12 distributed along the circumferential direction, water absorption sponge is arranged in each separation cavity 13, a water inlet 14 of the sampling outer tube is formed in the inner tube and the outer tube on the inner side and the outer side of the separation cavity, and a partition plate air bag is used for being in contact fit with the inner wall of the inner tube. When water vapor enters the corresponding separation cavity through the water inlet of the sampling outer pipe on the outer pipe, the water droplets condensed by the water vapor can be adsorbed by the water absorbing sponge in the corresponding separation cavity, so that the water droplets are prevented from flowing to other positions along the inner wall of the outer pipe.

The outer turnover of sampling inner tube is overlapped and is equipped with first cover 18 and second cover 19 that rotate, and first baffle 16 is fixed in on the first cover 18 that rotates, and second baffle 17 is fixed in on the second cover 19 that rotates, and first cover is last to be offered along first cover circumference extension's the cover guiding hole that rotates, and second rotates the one end that the second baffle was kept away from in the cover circumference and rotates the cover guiding hole direction and remove the cooperation.

The left end of sampling inner tube 15 is fixed to be set up in the equipment room, baffle actuating mechanism is including being fixed in the first motor 25 and the second motor 26 of sampling inner tube left end, no gas gets into in the equipment room, can improve the security of first motor, the work of second motor, the left end of first cover 18 stretches into in the equipment room, the left end of second cover stretches into in the equipment room, the left end of first cover 18 is fixed with first transmission ring gear 29, the left end of second cover 19 is fixed with second transmission ring gear 30, be fixed with on the motor shaft of first motor with first transmission ring gear interlock driven first gear 27, be fixed with on the motor shaft of second motor with second transmission ring gear interlock driven second gear 28. The first motor 25 is operated and can rotate with the first rotating sleeve and the first partition plate 16 through the first transmission gear ring 29; the second motor 26 is operated and can rotate with the second rotating sleeve 19 and the second partition 17 by means of the second gear ring 30.

When the sampling device is used, firstly, the sampling hole and the extraction hole are drilled on the extraction working surface of the mine, the extraction pipe is arranged in the extraction hole, and the sampling pipe is arranged in the sampling hole.

The concrete water injection time is as follows: defining four extraction pipes at the periphery of the sampling pipe as a first extraction pipe, a second extraction pipe, a third extraction pipe and a fourth extraction pipe in sequence along the circumferential direction, defining the space outside the sampling inner pipe as a first quadrant corresponding to the first extraction pipe, a second quadrant corresponding to the second extraction pipe, a third quadrant corresponding to the third extraction pipe and a fourth quadrant opposite to the fourth extraction pipe, wherein the central angle of each quadrant is 90 degrees, the origin of coordinates of each quadrant is positioned on the axis of the sampling pipe, that is, the first extraction pipe is positioned at the upper right corner of the first quadrant, the second extraction pipe is positioned at the lower right corner of the second quadrant, the third extraction pipe is positioned at the lower left corner of the third quadrant, and the fourth extraction pipe is positioned at the upper left corner of the fourth quadrant;

the first step, the water injection section of the first extraction pipe works to set water injection pressure to inject water to the surrounding coal seam until the humidity sensor corresponding to the sampling section samples a humidity signal, the water injection operation of the water injection section of the first extraction pipe is stopped, and the water injection duration T is recorded ₁ ，

The second step, finding out the circumferential area spanned by the water inlet of the sampling outer tube of the inflow water through the relative interval adjustment and circumferential position adjustment of the first baffle plate and the second baffle plate, if the circumferential area spanned by the water inlet of the sampling outer tube of the inflow water is not smaller than the circumferential area corresponding to the water inlet of the sampling outer tube corresponding to the first quadrant, then carrying out the third step; if the circumferential area spanned by the water inlet of the sampling tube is smaller than the circumferential area corresponding to the water inlet of the sampling tube corresponding to the first quadrant, the water injection section of the first extraction tube is restarted until the circumferential area spanned by the water inlet of the sampling tube is not smaller than the circumferential area corresponding to the water inlet of the sampling tube corresponding to the first quadrant, and the water injection time length T of the section is recorded ₂ ；

The specific operation process of the first step is that the first baffle plate and the second baffle plate are adjusted to be vertical before the water injection section of the first extraction pipe works, as shown in fig. 4, a sampling space between the first baffle plate and the second baffle plate corresponds to a first quadrant region, a baffle plate air bag is inflated, the periphery of the baffle plate air bag is in sealing fit with the inner wall of the inner layer outer tube, and at the moment, the sampling space is not communicated with air flow on the opposite sides of the first baffle plate and the second baffle plate;

then, the water injection section of the first extraction pipe works, water expands from inside to outside along the radial direction of the first extraction pipe under pressure, and when water enters the corresponding separation cavity through the water inlet of the corresponding sampling outer pipe of the outer layer outer pipe, the water injection time T at the moment is recorded ₁ Stopping the water injection operation of the first extraction pipe, and judging the distribution area of the water injection process on the outer pipe of the outer layer;

in this embodiment, each quadrant spans four compartments in the circumferential direction, that is, when the first partition plate and the second partition plate are vertical, the sampling space between the first partition plate and the second partition plate spans four compartments in the circumferential direction, specifically, if only the first humidity sensor senses a humidity signal, and the second humidity sensor does not sense a humidity signal, it indicates that water has entered an area corresponding to the first quadrant, the first partition plate (or the second partition plate) is fixed, so that the second partition plate relatively rotates towards the first partition plate, and after each time spans a circumferential angle of one compartment, for example, after the second partition plate spans the circumferential angle of one compartment for the first time, the compartment spanned by the second partition plate for the first time is called the first compartment, if the first humidity sensor does not measure a humidity signal, and if the second humidity sensor measures a humidity signal, it indicates that water in the coal seam enters the first compartment, the area corresponding to the first compartment is the distribution area of the water injection process on the outer layer outer tube; of course, it will also appear that the first humidity sensor measures a humidity signal, and the second humidity sensor measures a humidity signal, which indicates that water enters the first partition chamber, and that water also enters other partition chambers between the first partition plate and the second partition plate;

through the second baffle at every turn stride one partition chamber towards first baffle swing or keep away from first baffle swing, fixed second baffle, first baffle towards or keep away from the form of second baffle swing, cooperation first humidity transducer and second humidity transducer, can be accurate judge which partition chamber has entered water in the bottom to judge the distribution area of water injection process on outer tube. If the area distributed on the outer tube of the outer layer is not covered with the whole first quadrant, the first extraction tube continues to inject water until the area distributed on the outer tube of the outer layer is covered with the whole first quadrant, and the water injection duration T is recorded ₂ T is then ₁ +T ₂ The water injection time length required by the first extraction pipe is the following time; if the area of the water injection distributed on the outer tube of the outer layer already covers the whole first quadrant, T ₁ The water injection time length required by the first extraction pipe is the following time;

third step, after the space between the sampling inner tube and the sampling outer tube is dried, drying between the sampling inner tube and the sampling outer tube can be improved by a fan, and second step, drying efficiency between the sampling inner tube and the sampling outer tube can be improved by a fanThe water injection section of the extraction pipe works, the first step and the second step are repeated; judging how much time is needed for the water injection process to cover the whole second quadrant, for example, T is needed by the single water injection operation of the second extraction pipe ₃ Time;

fourth, repeating the third step to finish the operation of the water injection sections of the third extraction pipe and the fourth extraction pipe, thereby obtaining the water injection time required by the independent operation of the water injection sections of the extraction pipes; for example, the third extraction pipe works independently, and T is required for completing the full-coverage water injection of the third quadrant ₄ The length of time, the fourth extraction pipe works independently, and T is needed for completing the fourth quadrant full-coverage water injection ₅ Duration of time;

and fifthly, the water injection sections of the extraction pipes simultaneously finish water injection of the surrounding coal seam respectively in the water injection time length obtained in the previous four steps. Therefore, the coal seam between the extraction pipe and the sampling pipe can be fully soaked by water, and a leakage leaching area is not easy to occur.

The water injection method has the technical scheme that:

defining four extraction pipes at the periphery of the sampling pipe as a first extraction pipe, a second extraction pipe, a third extraction pipe and a fourth extraction pipe in sequence along the circumferential direction, defining the space outside the sampling inner pipe as a first quadrant corresponding to the first extraction pipe, a second quadrant corresponding to the second extraction pipe, a third quadrant corresponding to the third extraction pipe and a fourth quadrant opposite to the fourth extraction pipe, wherein the central angle of each quadrant is 90 degrees, the origin of coordinates of each quadrant is positioned on the axis of the sampling pipe, that is, the first extraction pipe is positioned at the upper right corner of the first quadrant, the second extraction pipe is positioned at the lower right corner of the second quadrant, the third extraction pipe is positioned at the lower left corner of the third quadrant, and the fourth extraction pipe is positioned at the upper left corner of the fourth quadrant; the specific construction of the sampling tube is the same as that described in the above-described embodiments of the water injection device and will not be described in detail herein.

The first step, the water injection section of the first extraction pipe works to set water injection pressure to inject water to the surrounding coal seam until the humidity sensor corresponding to the sampling section samples a humidity signal, the water injection operation of the water injection section of the first extraction pipe is stopped, and the water injection duration T is recorded ₁ ，

Second step, go throughFinding out the circumferential area spanned by the water inlet of the sampling outer tube of the inflow water through the relative interval adjustment and circumferential position adjustment of the first partition plate and the second partition plate, if the circumferential area spanned by the water inlet of the sampling outer tube of the inflow water is not smaller than the circumferential area corresponding to the water inlet of the sampling tube corresponding to the first quadrant, then performing the third step; if the circumferential area spanned by the water inlet of the sampling tube is smaller than the circumferential area corresponding to the water inlet of the sampling tube corresponding to the first quadrant, the water injection section of the first extraction tube is restarted until the circumferential area spanned by the water inlet of the sampling tube is not smaller than the circumferential area corresponding to the water inlet of the sampling tube corresponding to the first quadrant, and the water injection time length T of the section is recorded ₂ ；

The specific operation process of the first step is that the first baffle plate and the second baffle plate are adjusted to be vertical before the water injection section of the first extraction pipe works, as shown in fig. 4, a sampling space between the first baffle plate and the second baffle plate corresponds to a first quadrant region, a baffle plate air bag is inflated, the periphery of the baffle plate air bag is in sealing fit with the inner wall of the inner layer outer tube, and at the moment, the sampling space is not communicated with air flow on the opposite sides of the first baffle plate and the second baffle plate;

then, the water injection section of the first extraction pipe works, water expands from inside to outside along the radial direction of the first extraction pipe under pressure, and when water enters the corresponding separation cavity through the water inlet of the corresponding sampling outer pipe of the outer layer outer pipe, the water injection time T at the moment is recorded ₁ Stopping the water injection operation of the first extraction pipe, and judging the distribution area of the water injection process on the outer pipe of the outer layer;

in this embodiment, each quadrant spans four compartments in the circumferential direction, that is, when the first partition plate and the second partition plate are vertical, the sampling space between the first partition plate and the second partition plate spans four compartments in the circumferential direction, specifically, if only the first humidity sensor senses a humidity signal, and the second humidity sensor does not sense a humidity signal, it indicates that water has entered an area corresponding to the first quadrant, the first partition plate (or the second partition plate) is fixed, so that the second partition plate relatively rotates towards the first partition plate, and after each time spans a circumferential angle of one compartment, for example, after the second partition plate spans the circumferential angle of one compartment for the first time, the compartment spanned by the second partition plate for the first time is called the first compartment, if the first humidity sensor does not measure a humidity signal, and if the second humidity sensor measures a humidity signal, it indicates that water in the coal seam enters the first compartment, the area corresponding to the first compartment is the distribution area of the water injection process on the outer layer outer tube; of course, it will also appear that the first humidity sensor measures a humidity signal, and the second humidity sensor measures a humidity signal, which indicates that water enters the first partition chamber, and that water also enters other partition chambers between the first partition plate and the second partition plate;

through the second baffle at every turn stride one partition chamber towards first baffle swing or keep away from first baffle swing, fixed second baffle, first baffle towards or keep away from the form of second baffle swing, cooperation first humidity transducer and second humidity transducer, can be accurate judge which partition chamber has entered water in the bottom to judge the distribution area of water injection process on outer tube. If the area distributed on the outer tube of the outer layer is not covered with the whole first quadrant, the first extraction tube continues to inject water until the area distributed on the outer tube of the outer layer is covered with the whole first quadrant, and the water injection duration T is recorded ₂ T is then ₁ +T ₂ The water injection time length required by the first extraction pipe is the following time; if the area of the water injection distributed on the outer tube of the outer layer already covers the whole first quadrant, T ₁ The water injection time length required by the first extraction pipe is the following time;

thirdly, after the space between the sampling inner pipe and the sampling outer pipe is dried, drying between the sampling inner pipe and the sampling outer pipe can be improved through a fan, the water injection section of the second extraction pipe works, and the first step and the second step are repeated; judging how much time is needed for the water injection process to cover the whole second quadrant, for example, T is needed by the single water injection operation of the second extraction pipe ₃ Time;

fourth, repeating the third step to finish the water injection sections of the third extraction pipe and the fourth extraction pipe, thereby obtaining the water injection sections of the extraction pipes required when working independentlyWater injection duration; for example, the third extraction pipe works independently, and T is required for completing the full-coverage water injection of the third quadrant ₄ The length of time, the fourth extraction pipe works independently, and T is needed for completing the fourth quadrant full-coverage water injection ₅ Duration of time;

and fifthly, the water injection sections of the extraction pipes simultaneously finish water injection of the surrounding coal seam respectively in the water injection time length obtained in the previous four steps. Therefore, the coal seam between the extraction pipe and the sampling pipe can be fully soaked by water, and a leakage leaching area is not easy to occur.

In the foregoing description of the present specification, the terms "fixed," "mounted," "connected," or "connected" are to be construed broadly, unless explicitly stated or limited otherwise. For example, in terms of the term "coupled," it may be fixedly coupled, detachably coupled, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intermediaries, or in communication with each other or in interaction with each other. Therefore, unless otherwise specifically defined in the specification, a person skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

Those skilled in the art will also appreciate from the foregoing description that terms such as "upper," "lower," "front," "rear," "left," "right," "length," "width," "thickness," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," "center," "longitudinal," "transverse," "clockwise," or "counterclockwise" and the like are used herein for the purpose of facilitating description and simplifying the description of the present invention, and thus do not necessarily have to have, configure, or operate in, the specific orientations, and thus are not to be construed or construed as limiting the present invention.

In addition, the terms "first" or "second" and the like used in the present specification to refer to the numbers or ordinal numbers are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present specification, the meaning of "plurality" means at least two, for example, two, three or more, etc., unless explicitly defined otherwise.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the 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 scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (7)

1. The utility model provides a supporting water injection device that uses of coal exploitation gas extraction, including the axis along the sampling pipe that left and right sides orientation extends and four evenly distributed in the peripheral extraction pipe of sampling pipe is provided with a plurality of water injection sections that set up along left and right sides orientation order on the extraction pipe, is provided with a plurality of sampling sections that correspond the setting with the water injection section on the sampling pipe, its characterized in that: the sampling section includes that periphery and sampling hole's pore wall contact complex sampling outer tube, circumference distribution has a plurality of sampling outer tube water inlets on the sampling outer tube, sampling section still includes the coaxial line and is fixed in the inboard sampling inner tube of sampling outer tube, coaxial line rotation is equipped with along the radial first baffle and the second baffle of extending of sampling inner tube on the sampling inner tube, first baffle, the second baffle is respectively by the drive of the baffle actuating mechanism that corresponds respectively make interval between first baffle, the second baffle and first baffle, the second baffle is adjustable relative sampling inner tube's circumference position, be provided with first humidity transducer between first baffle, the second baffle, the outside of first baffle, the second baffle is provided with second humidity transducer, the outer end of first baffle, the second baffle is provided with and is used for with sampling outer tube inner wall sealing complex baffle gasbag, form the sampling space between first baffle, the second baffle.

2. The water injection device of claim 1, wherein: the sampling section also comprises a fan which is connected with the sampling space through a hose.

3. The water injection device of claim 1, wherein: the sampling outer tube comprises an outer tube and an inner tube arranged on the inner side of the outer tube coaxially, an annular space between the inner tube and the outer tube is divided into a plurality of separation cavities which are sequentially arranged along the circumferential direction by a plurality of outer tube partition plates distributed along the circumferential direction, water absorbing sponges are arranged in each separation cavity, a water inlet of the sampling outer tube is arranged on the inner tube and the outer tube on the inner side and the outer side of the separation cavity, and a partition plate air bag is used for being in contact sealing fit with the inner wall of the inner tube.

4. The water injection device of claim 2, wherein: the inner cavity of the sampling pipe section is divided into a device room and a sampling room which are arranged left and right by pipe section partition boards, a partition board driving mechanism and a fan are arranged in the device room, and a first partition board and a second partition board are arranged in the sampling room.

5. The water injection device of claim 4, wherein: the outer turnover of sampling inner tube is overlapped and is equipped with first rotation cover and second rotation cover, and first baffle is fixed in first rotation and sheathes in, and the second baffle is fixed in the second and is sheathes in, and first rotation is sheathes in and is offered along first rotation cover circumference extension's rotation cover guiding hole, and the second is rotated the one end that the second baffle was kept away from in circumference and is rotated the cover guiding hole direction and remove the cooperation.

6. The water injection device of claim 5, wherein: the left end of the sampling inner tube is fixedly arranged in the equipment room, the baffle driving mechanism comprises a first motor and a second motor which are fixed at the left end of the sampling inner tube, the left end of the first rotating sleeve stretches into the equipment room, the left end of the second rotating sleeve stretches into the equipment room, the left end of the first rotating sleeve is fixedly provided with a first transmission gear ring, the left end of the second rotating sleeve is fixedly provided with a second transmission gear ring, a motor shaft of the first motor is fixedly provided with a first gear which is meshed with the first transmission gear ring, and a motor shaft of the second motor is fixedly provided with a second gear which is meshed with the second transmission gear ring.

7. A water injection method using the water injection device according to any one of claims 1 to 6, characterized in that: the four extraction pipes defining the periphery of the sampling pipe are respectively a first extraction pipe, a second extraction pipe, a third extraction pipe and a fourth extraction pipe in sequence along the circumferential direction, the space outside the sampling inner pipe is defined into a first quadrant corresponding to the first extraction pipe, a second quadrant corresponding to the second extraction pipe, a third quadrant corresponding to the third extraction pipe and a fourth quadrant opposite to the fourth extraction pipe, the central angle of each quadrant is 90 degrees, the origin of coordinates of each quadrant is positioned on the axis of the sampling pipe,

the first step, the water injection section of the first extraction pipe works to set water injection pressure to inject water to the surrounding coal seam until the humidity sensor corresponding to the sampling section samples a humidity signal, the water injection operation of the water injection section of the first extraction pipe is stopped, and the water injection duration T is recorded ₁ ，

The second step, finding out the circumferential area spanned by the water inlet of the sampling outer tube of the inflow water through the relative interval adjustment and circumferential position adjustment of the first baffle plate and the second baffle plate, if the circumferential area spanned by the water inlet of the sampling outer tube of the inflow water is not smaller than the circumferential area corresponding to the water inlet of the sampling outer tube corresponding to the first quadrant, then carrying out the third step; if the circumferential area spanned by the water inlet of the sampling tube is smaller than the circumferential area corresponding to the water inlet of the sampling tube corresponding to the first quadrant, the water injection section of the first extraction tube is restarted until the circumferential area spanned by the water inlet of the sampling tube is not smaller than the circumferential area corresponding to the water inlet of the sampling tube corresponding to the first quadrant, and the water injection time length T of the section is recorded ₂ ；

Thirdly, after the space between the sampling inner pipe and the sampling outer pipe is dried, the water injection section of the second extraction pipe works, and the first step and the second step are repeated;

fourth, repeating the third step to finish the operation of the water injection sections of the third extraction pipe and the fourth extraction pipe, thereby obtaining the water injection time required by the independent operation of the water injection sections of the extraction pipes;

and fifthly, the water injection section of each extraction pipe simultaneously completes water injection to the surrounding coal seam in the water injection time length obtained in the previous four steps.