CN114215584A - Method for extracting gas from fan-shaped slot derived drill hole - Google Patents
Method for extracting gas from fan-shaped slot derived drill hole Download PDFInfo
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- CN114215584A CN114215584A CN202210065267.3A CN202210065267A CN114215584A CN 114215584 A CN114215584 A CN 114215584A CN 202210065267 A CN202210065267 A CN 202210065267A CN 114215584 A CN114215584 A CN 114215584A
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000003245 coal Substances 0.000 claims abstract description 62
- 238000000605 extraction Methods 0.000 claims abstract description 61
- 238000005553 drilling Methods 0.000 claims abstract description 48
- 238000010276 construction Methods 0.000 claims abstract description 24
- 229920002635 polyurethane Polymers 0.000 claims description 10
- 239000004814 polyurethane Substances 0.000 claims description 10
- 239000002002 slurry Substances 0.000 claims description 10
- 230000008878 coupling Effects 0.000 claims description 6
- 238000010168 coupling process Methods 0.000 claims description 6
- 238000005859 coupling reaction Methods 0.000 claims description 6
- 230000005465 channeling Effects 0.000 claims description 5
- 229920000742 Cotton Polymers 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 239000002817 coal dust Substances 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 3
- 230000008901 benefit Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 241000237509 Patinopecten sp. Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 235000020637 scallop Nutrition 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B3/00—Rotary drilling
- E21B3/02—Surface drives for rotary drilling
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
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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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/001—Drilling a non circular hole
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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Abstract
The invention relates to a method for extracting gas by deriving a drilled hole through a fan-shaped slot, which belongs to the field of coal mine safety, and aims to solve the problems of long construction period, large engineering quantity and high labor intensity of personnel caused by the fact that a drilling site needs to be arranged for extracting gas by drilling in a conventional fan-shaped arrangement mode, a method of combining an angle-adjustable self-swinging device with a slotting construction process is adopted, a fan-shaped slot is constructed in a coal body of a stoping working face, then a drilling machine is used for constructing a fan-shaped drilled hole in the coal body through the fan-shaped slot, a plurality of extraction pipes with sieve hole pipes are placed into the fan-shaped slot, then plugging operation is carried out immediately, the extraction pipes are connected with a gas extraction pipeline under a coal mine, and then coal seam gas extraction is carried out.
Description
Technical Field
The invention belongs to the field of coal mine safety, and relates to a method for extracting gas from a fan-shaped slot derived borehole.
Background
The air permeability of the coal seam is generally low, gas extraction is a main technical measure for preventing and controlling coal and gas outburst, and more important measures for more effectively extracting gas are explored. At present, due to the limitation of geological conditions of coal bed gas, a plurality of mines are not suitable for adopting the advanced long-distance directional drilling coal bed gas extraction process, and the gas extraction is still implemented by adopting a mode of arranging inclined drilling holes, wherein the drilling holes in a fan-shaped arrangement form are widely applied, because the drilling frequency of fan-shaped drilling holes is relatively less, and the requirement on drilling equipment is lower. Meanwhile, in a plurality of stope faces adopting parallel drill holes to extract coal bed gas, if the gas extraction effect of a coal body in a certain area is relatively poor, extraction is difficult to reach the standard before stope, so that reinforced extraction or supplement measures are also implemented on the area with poor extraction effect by adopting the drill holes arranged in the fan shape under the condition, and the aim of ensuring the safe production of a mine is achieved. Therefore, the extraction of coal bed gas by the sector-shaped drilled holes is still a measure for controlling gas disasters in various mines in China. However, the construction of the fan-shaped drilling often requires the arrangement of a drilling site in the coal roadway, and the construction period of the drilling site is relatively long, and the engineering quantity is large, so that the cost is high; in addition, after the gas drill hole is constructed in the drill site, the drill hole needs to be immediately plugged, and because several or even more than ten gas extraction drill holes need to be constructed in the drill site, the frequency of hole sealing operation is high, and the labor intensity of personnel is increased. Therefore, by taking the drilling and coal bed gas extraction in the fan-shaped arrangement form as a starting point, a certain suitable drilling construction and coal bed gas extraction process is sought, the problems of long construction period, large engineering quantity and large labor intensity of personnel caused by the fact that drilling sites need to be arranged for drilling and gas extraction in the conventional fan-shaped arrangement form, and the problem is solved urgently by coal mine safety science and technology workers.
Disclosure of Invention
In view of the above, the invention aims to provide a method for extracting gas by fan-shaped slot derived drill holes, which aims at the problems of long construction period, large engineering quantity and high labor intensity of personnel caused by the fact that drilling sites are required to be arranged for extracting gas by drill holes in a conventional fan-shaped arrangement mode, adopts a method of combining an angle-adjustable self-swinging device with a slotting construction process to construct a fan-shaped slot in a coal body of a stope face, then applies a drilling machine to construct fan-shaped drill holes in the coal body through the fan-shaped slot, puts extraction pipes with sieve holes into the fan-shaped slot, then carries out plugging operation, connects the extraction pipes with a gas extraction pipeline under a coal mine, and further extracts coal bed gas.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for extracting gas from a fan-shaped slot derived borehole comprises the following steps:
s1: constructing a central guide hole on the coal wall in the crossheading of the stope along the inclined direction of the coal bed by using a drilling machine, wherein the hole depth is the boundary of a fan-shaped slot for subsequent construction; placing the slotting drill bit in the central guide hole, and connecting the universal joint and the driving rod; adjusting the position of a screw rod on the angle-adjustable self-swinging device to drive a rotating slide block to move in the axial direction of an input rotating rod; and simultaneously connecting the driving rod with a clamping device of the drilling machine through a plurality of finger-shaped couplings; then, starting a motor to enable an input rotating rod to rotate, further enabling a spherical four-bar structure to convert the rotating motion of the input rotating rod into the swinging motion of a swinging rod, and simultaneously starting a drilling machine to enable a plurality of finger-shaped couplers to drive a driving rod to generate rotating motion, further driving a slotting drill bit to cut coal around a central guide hole under the constraint of a positioning frame, so as to form an arc; then, gradually increasing the driving rod and the pull rod to enable the channeling drill bit to gradually cut to a preset position, and finally forming a fan-shaped slot in the coal body of the stope face;
s2: after the sector slot is constructed, the self-swinging device with the adjustable angle is removed, and the cutting drill bit and the universal joint are retreated from the sector slot; high-pressure air is sent into the fan-shaped slot through a compressed air pipe under the coal mine, and coal dust in the fan-shaped slot is injected into a crossheading of a stope face;
s3: moving the drilling machine to the opening of the fan-shaped slot, connecting a drill rod and a drill bit, and constructing a plurality of drill holes in the coal body along the arc of the fan-shaped slot; then the drill rod and the drill bit are withdrawn, and the drilling machine is removed;
s4: placing the three extraction pipes with the sieve holes into the fan-shaped slot, and unfolding the three extraction pipes along the fan-shaped slot, wherein a curtain is connected between the extraction pipe positioned at the central position and the other two extraction pipes; two extraction pipes are tightly attached to two straight line boundaries of the fan-shaped slot, and the other extraction pipe is the same as the original central guide hole in position; and connecting the coiled pipe with the ports of the three extraction pipes, and then connecting the coiled pipe with the extraction pipes to realize the gas extraction of the fan-shaped slot derived drill hole.
Further, the step S1 specifically includes the following steps:
s11: according to the requirements of field engineering, a drilling machine is applied to construct a central guide hole on the coal wall in the crossheading of the stope along the direction parallel to the inclination of the coal bed, and the hole depth is the boundary of a fan-shaped slot for subsequent construction; the inner diameter of the central guide hole is larger than the maximum radius of the outer edge of a cutting drill used in subsequent construction of fan-shaped slot;
s12: then, according to the actual situation on site, the cut drill bit is arranged in the central guide hole and is sequentially connected with the arc triangular rotating block, the universal joint and the driving rod; a positioning square frame with a square section is arranged on the periphery of the arc triangular rotating block, and the arc triangular rotating block is restrained by the positioning square frame while rotating motion is transmitted by the universal joint, so that a rectangular section is formed by the cutting of coal around the central guide hole by the undermining drill bit; the driving rod is used for driving the cut drill to rotate when the fan-shaped slot is constructed, and the other end of the driving rod is connected with the finger-shaped coupler; the finger-shaped coupler transmits the rotation motion of one end through finger-shaped upright rods arranged on two end faces of the finger-shaped coupler; the position of a screw rod on the self-swinging device with adjustable adjusting angle is adjusted, so that a sliding block moves in the axial direction of an input rotating rod, and the swinging amplitude of a swinging rod under the working condition is ensured to meet the engineering requirement;
s13: simultaneously, the driving rod is connected with a clamping device of the drilling machine through a plurality of finger-shaped couplings; then, a motor is started to enable an input rotating rod to rotate, so that the spherical four-bar structure converts the rotating motion of the input rotation into the swinging motion of a swinging rod, and meanwhile, a drilling machine is started, so that a plurality of finger-shaped couplers drive a driving rod to rotate, so that a cutting drill bit is driven to cut coal around a central guide hole under the constraint of a positioning frame, and a certain arc is formed after the cutting; and then gradually increasing the driving rod and the pull rod to enable the channeling drill bit to gradually cut to a preset position, and finally forming a fan-shaped slot in the coal body of the stope face.
Further, step S4 includes: injecting the mixed polyurethane slurry into the grouting opening to fill the space among the three extraction pipes; and cotton yarns stained with mixed polyurethane slurry are wound on the outer walls of the two extraction pipes close to the two linear boundaries of the fan-shaped slot, and the two extraction pipes are close to the coal wall of the fan-shaped slot along with the reaction of the polyurethane slurry.
The invention has the beneficial effects that: the invention provides a method for extracting gas from a fan-shaped slot derived drill hole, which solves the problems of long construction period, large engineering quantity and large labor intensity of personnel caused by the need of drilling and plugging for multiple times because a drill site needs to be arranged for extracting gas from the drill hole in a conventional fan-shaped arrangement mode; the method comprises the steps of constructing a fan-shaped slot in a coal body of a stope face by adopting a method of combining an angle-adjustable self-swinging device with a cut construction process, then constructing fan-shaped holes in the coal body through the fan-shaped slot by using a drilling machine, placing a plurality of extraction pipes with sieve hole pipes into the fan-shaped slot, immediately performing plugging operation, connecting the extraction pipes with a coal mine underground gas extraction pipeline, and further performing coal bed gas extraction. Compared with the traditional gas extraction method, the method for extracting the gas from the fan-shaped slot derived borehole has the following advantages:
(1) the method for extracting the gas by the fan-shaped slot derived drill hole does not need to provide a special drill site, and the gas extraction of the coal bed can be realized only by constructing the fan-shaped slot and the drill hole constructed along the arc direction of the fan-shaped slot, so that the method has the advantages of small engineering quantity, short construction period and saved gas treatment cost;
(2) according to the method for extracting the gas by the fan-shaped slot derived drill hole, the plurality of extraction pipes with the sieve hole pipes are placed into the fan-shaped slot, the polyurethane slurry is injected into the space between the outer wall of each extraction pipe and the inner wall of the fan-shaped slot, effective sealing can be realized only by one grouting and plugging operation, the hole sealing frequency of the conventional fan-shaped drill hole is greatly reduced, the operation period is shortened, and the method has extremely obvious technical and economic benefits.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic view of a scallop slot;
FIG. 2 is a schematic view of a fan slot derivative drill;
FIG. 3 is a schematic structural view of an apparatus used in the method;
FIG. 4 is a schematic view of a finger coupler construction;
fig. 5 is a schematic diagram of a drilling machine structure.
Reference numerals: the drilling machine comprises a drilling machine 1, a slotting drill bit 2, a universal joint 3, a driving rod 4, an angle-adjustable self-swinging device 5, a screw rod 6, a rotating slider 7, an input rotating rod 8, a swinging rod 9, a clamping device 10, a finger-shaped coupler 11, a spherical four-bar structure 12, a positioning frame 13, a pull rod 14, an arc triangular rotating block 15, a rotating fixing seat 16, a spring 17 and a thread 18.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
Referring to fig. 1 to 5, the present invention provides a method for extracting gas from a sector slot derivative borehole, including the following steps:
s1: according to the requirements of field engineering, a drilling machine 1 is applied to construct a central guide hole on the coal wall in the crossheading of the stope along the inclined direction of a coal bed, and the hole depth is the boundary of a fan-shaped slot for subsequent construction; then, according to the actual situation on site, the cut drill bit 2 is arranged in the central guide hole and connected with the universal joint 3 and the driving rod 4; the position of a screw rod 6 on the adjustable-angle self-swinging device 5 is adjusted to drive a rotating slide block 7 to move in the axial direction of an input rotating rod 8, so that the swinging amplitude of a swinging rod 9 under the working condition is ensured to meet the engineering requirement; and simultaneously connecting the driving rod 4 with a clamping device 10 of the drilling machine 1 through a plurality of finger-shaped couplings 11; then, the explosion-proof motor is started to enable the input rotating rod 8 to rotate, the spherical four-bar structure 12 is enabled to convert the rotating motion of the input rotating rod 8 into the swinging motion of the swinging rod 9, meanwhile, the drilling machine 1 is started, the plurality of finger-shaped couplers 11 drive the driving rod 4 to generate rotating motion, the cutting bit 2 is driven to cut coal bodies around the central guide hole under the constraint of the positioning frame 13, and a certain circular arc is formed after the cutting; and then gradually increasing the driving rod 4 and the pull rod 14 to enable the slitting drill 2 to gradually cut to a preset position, and finally forming a fan-shaped slot in the coal body of the stope face. The step S1 specifically includes the following steps:
s11: according to the requirements of field engineering, a drilling machine 1 is applied to construct a central guide hole on the coal wall in the crossheading of the stope along the direction parallel to the inclination of a coal bed, and the hole depth of the central guide hole is the boundary of a sector slot for subsequent construction; the inner diameter of the central guide hole is larger than the maximum radius of the outer edge of a cutting drill used in subsequent construction of fan-shaped slot;
s12: then according to the actual situation on site, the cutting drill bit 2 is arranged in the central guide hole and is sequentially connected with the arc triangular rotating block 15, the universal joint 3 and the driving rod 4, wherein the universal joint 3 and the driving rod 4 are connected through a rotating fixing seat 16; a positioning square frame 13 with a square section is arranged on the periphery of the arc triangular rotating block 15, and the arc triangular rotating block 15 is restrained by the positioning square frame 13 while rotating motion is transmitted by the universal joint 3, so that the cut coal body around the central guide hole of the cutting drill 2 forms a rectangular section; the driving rod 4 is used for driving the cut drill bit 2 to rotate when a fan-shaped slot is constructed, and the other end of the driving rod 4 is connected with the finger-shaped coupler 11; the finger-shaped coupler 11 transmits the rotation motion of one end through finger-shaped upright rods arranged on two end faces of the finger-shaped coupler 11; the position of a screw rod 6 on the self-swinging device 5 with adjustable adjusting angle is adjusted, so that a rotating slide block 7 moves in the axial direction of an input rotating rod 8, and the swinging amplitude of a swinging rod 9 under the working condition is ensured to meet the engineering requirement. In the angle-adjustable self-swinging apparatus 5 disclosed in the present embodiment, the angle-adjustable rocker, the four-bar-spherical structure 12, converts the input rotation into the angular vibration of the rocker. The screw rod 6 enables the rotary slide block 7 to move axially, so that the output angle of the rocker is changed. The screw rod 6, the rotating slide block 7, the input rotating rod 8 and the swinging rod 9 are all arranged on a supporting seat 17 of the angle-adjustable self-swinging device 5.
S13: simultaneously, the driving rod 4 is connected with a clamping device 10 of the drilling machine 1 through a plurality of finger-shaped couplings 11; then, the motor is started to enable the input rotating rod 8 to rotate, the spherical four-bar structure 12 is enabled to convert the rotating motion of the input rotating rod 8 into the swinging motion of the swinging rod 9, meanwhile, the drilling machine 1 is started, the plurality of finger-shaped couplers 11 drive the driving rod 4 to generate the rotating motion, the cutting bit 2 is driven to cut coal bodies around the central guide hole under the constraint of the positioning frame 13, and a certain arc is formed after the cutting; and then the driving rod 4 and the pull rod 14 are gradually increased to enable the channeling drill 2 to gradually cut to a preset position, and finally a fan-shaped slot is formed in the coal body of the stope face. The pull rod 14 is further provided with a spring 17 and a thread 18, and the thread 18 is used for being in threaded connection with a swing rod 19.
S2: after the sector slot construction is finished, immediately removing the angle-adjustable self-swinging device 5, and withdrawing the slotting drill bit 2, the universal joint 3 and the like from the sector slot; then, sending the compressed air pipe under the coal mine into the fan-shaped slot to enable high-pressure air to enter the slot, and blowing the coal dust in the fan-shaped slot into a crossheading of a stope face;
s3: moving the drilling machine 1 to a fan-shaped slot opening, connecting a drill rod and a drill bit, and then constructing a plurality of drill holes into the coal body along the arc of the fan-shaped slot according to the construction requirement until the number of the constructed drill holes reaches the construction requirement; then, withdrawing the drill rod and the drill bit, and removing the drilling machine;
s4: placing three extraction pipes with sieve holes into the fan-shaped slot, unfolding the three extraction pipes along the fan-shaped slot, enabling two extraction pipes to be tightly attached to two linear boundaries of the fan-shaped slot, and enabling the other extraction pipe to be in the same direction as the original central guide hole; injecting mixed polyurethane slurry into the grouting opening to fill the space among the three extraction pipes; two extraction pipes tightly attached to two linear boundaries of the fan-shaped slot are wound with cotton yarns stained with mixed polyurethane slurry on the outer wall, so that the two extraction pipes are tightly attached to the coal wall of the fan-shaped slot along with the reaction of the polyurethane slurry. The sector slot is effectively sealed, the coiled pipe is connected with the ports of the three extraction pipes and then connected with the extraction pipeline, and gas extraction by derivation drilling of the sector slot is realized.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (3)
1. A method for extracting gas from a fan-shaped slot derived borehole is characterized by comprising the following steps: the method comprises the following steps:
s1: constructing a central guide hole on the coal wall in the crossheading of the stope along the inclined direction of the coal bed by using a drilling machine, wherein the hole depth is the boundary of a fan-shaped slot for subsequent construction; placing the slotting drill bit in the central guide hole, and connecting the universal joint and the driving rod; adjusting the position of a screw rod on the angle-adjustable self-swinging device to drive a rotating slide block to move in the axial direction of an input rotating rod; and simultaneously connecting the driving rod with a clamping device of the drilling machine through a plurality of finger-shaped couplings; then, starting a motor to enable an input rotating rod to rotate, further enabling a spherical four-bar structure to convert the rotating motion of the input rotating rod into the swinging motion of a swinging rod, and simultaneously starting a drilling machine to enable a plurality of finger-shaped couplers to drive a driving rod to generate rotating motion, further driving a slotting drill bit to cut coal around a central guide hole under the constraint of a positioning frame, so as to form an arc; then, gradually increasing the driving rod and the pull rod to enable the channeling drill bit to gradually cut to a preset position, and finally forming a fan-shaped slot in the coal body of the stope face;
s2: after the sector slot is constructed, the self-swinging device with the adjustable angle is removed, and the cutting drill bit and the universal joint are retreated from the sector slot; high-pressure air is sent into the fan-shaped slot through a compressed air pipe under the coal mine, and coal dust in the fan-shaped slot is injected into a crossheading of a stope face;
s3: moving the drilling machine to the opening of the fan-shaped slot, connecting a drill rod and a drill bit, and constructing a plurality of drill holes in the coal body along the arc of the fan-shaped slot; then the drill rod and the drill bit are withdrawn, and the drilling machine is removed;
s4: placing the three extraction pipes with the sieve holes into the fan-shaped slot, and unfolding the three extraction pipes along the fan-shaped slot, wherein a curtain is connected between the extraction pipe positioned at the central position and the other two extraction pipes; two extraction pipes are tightly attached to two straight line boundaries of the fan-shaped slot, and the other extraction pipe is the same as the original central guide hole in position; and connecting the coiled pipe with the ports of the three extraction pipes, and then connecting the coiled pipe with the extraction pipes to realize the gas extraction of the fan-shaped slot derived drill hole.
2. The method for extracting gas from the fan-shaped slot derived borehole according to claim 1, characterized by comprising the following steps: the step S1 specifically includes the following steps:
s11: according to the requirements of field engineering, a drilling machine is applied to construct a central guide hole on the coal wall in the crossheading of the stope along the direction parallel to the inclination of the coal bed, and the hole depth is the boundary of a fan-shaped slot for subsequent construction; the inner diameter of the central guide hole is larger than the maximum radius of the outer edge of a cutting drill used in subsequent construction of fan-shaped slot;
s12: then, according to the actual situation on site, the cut drill bit is arranged in the central guide hole and is sequentially connected with the arc triangular rotating block, the universal joint and the driving rod; a positioning square frame with a square section is arranged on the periphery of the arc triangular rotating block, and the arc triangular rotating block is restrained by the positioning square frame while rotating motion is transmitted by the universal joint, so that a rectangular section is formed by the cutting of coal around the central guide hole by the undermining drill bit; the driving rod is used for driving the cut drill to rotate when the fan-shaped slot is constructed, and the other end of the driving rod is connected with the finger-shaped coupler; the finger-shaped coupler transmits the rotation motion of one end through finger-shaped upright rods arranged on two end faces of the finger-shaped coupler; the position of a screw rod on the self-swinging device with adjustable adjusting angle is adjusted, so that a sliding block moves in the axial direction of an input rotating rod, and the swinging amplitude of a swinging rod under the working condition is ensured to meet the engineering requirement;
s13: simultaneously, the driving rod is connected with a clamping device of the drilling machine through a plurality of finger-shaped couplings; then, a motor is started to enable an input rotating rod to rotate, so that the spherical four-bar structure converts the rotating motion of the input rotation into the swinging motion of a swinging rod, and meanwhile, a drilling machine is started, so that a plurality of finger-shaped couplers drive a driving rod to rotate, so that a cutting drill bit is driven to cut coal around a central guide hole under the constraint of a positioning frame, and a certain arc is formed after the cutting; and then gradually increasing the driving rod and the pull rod to enable the channeling drill bit to gradually cut to a preset position, and finally forming a fan-shaped slot in the coal body of the stope face.
3. The method for extracting gas from the fan-shaped slot derived borehole according to claim 1, characterized by comprising the following steps: in step S4, the method further includes: injecting the mixed polyurethane slurry into the grouting opening to fill the space among the three extraction pipes; and cotton yarns stained with mixed polyurethane slurry are wound on the outer walls of the two extraction pipes close to the two linear boundaries of the fan-shaped slot, and the two extraction pipes are close to the coal wall of the fan-shaped slot along with the reaction of the polyurethane slurry.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210065267.3A CN114215584B (en) | 2022-01-18 | 2022-01-18 | Method for extracting gas from sector slot derivative drilling holes |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210065267.3A CN114215584B (en) | 2022-01-18 | 2022-01-18 | Method for extracting gas from sector slot derivative drilling holes |
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| CN114215584A true CN114215584A (en) | 2022-03-22 |
| CN114215584B CN114215584B (en) | 2023-06-06 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE650191A (en) * | 1963-07-12 | 1964-11-03 | ||
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| CN113622912A (en) * | 2021-07-30 | 2021-11-09 | 平顶山市安泰华矿用安全设备制造有限公司 | Outburst eliminating process for coal seam mining |
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2022
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| CN204663389U (en) * | 2014-12-18 | 2015-09-23 | 安徽恒源煤电股份有限公司煤矿 | Umbrella shape fixed band screw thread Addressable Parallel checker guiding device |
| CN113622912A (en) * | 2021-07-30 | 2021-11-09 | 平顶山市安泰华矿用安全设备制造有限公司 | Outburst eliminating process for coal seam mining |
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| CN114215584B (en) | 2023-06-06 |
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