CN114215584B - Method for extracting gas from sector slot derivative drilling holes - Google Patents
Method for extracting gas from sector slot derivative drilling holes Download PDFInfo
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- CN114215584B CN114215584B CN202210065267.3A CN202210065267A CN114215584B CN 114215584 B CN114215584 B CN 114215584B CN 202210065267 A CN202210065267 A CN 202210065267A CN 114215584 B CN114215584 B CN 114215584B
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- 238000005553 drilling Methods 0.000 title claims abstract description 75
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000003245 coal Substances 0.000 claims abstract description 62
- 238000010276 construction Methods 0.000 claims abstract description 24
- 238000000605 extraction Methods 0.000 claims description 59
- 230000008878 coupling Effects 0.000 claims description 15
- 238000010168 coupling process Methods 0.000 claims description 15
- 238000005859 coupling reaction Methods 0.000 claims description 15
- 229920002635 polyurethane Polymers 0.000 claims description 11
- 239000004814 polyurethane Substances 0.000 claims description 11
- 239000002002 slurry Substances 0.000 claims description 11
- 229920000742 Cotton Polymers 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 230000008901 benefit Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 210000001145 finger joint Anatomy 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000035699 permeability Effects 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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- Environmental & Geological Engineering (AREA)
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- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
Abstract
The invention relates to a method for extracting gas from a sector slot derivative drill hole, which belongs to the field of coal mine safety, and aims at the problems of long construction period, large engineering quantity and high labor intensity of personnel caused by the need of drilling a drill field and multiple drilling and plugging in a conventional sector arrangement mode.
Description
Technical Field
The invention belongs to the field of coal mine safety, and relates to a method for extracting gas from a sector slot derivative drill hole.
Background
The air permeability of the coal seam is generally low, gas extraction is a main technical measure for preventing coal and gas from protruding, and more important measures for extracting gas more effectively are explored. At present, due to the limitation of coal seam gas geological conditions, a plurality of mines are not suitable for adopting an advanced long-distance directional drilling coal seam gas extraction process, and gas extraction is still carried out by adopting a mode of arranging inclined drilling holes, wherein the drilling holes in a fan-shaped arrangement form are widely applied, because the moving drilling frequency of the fan-shaped drilling holes is relatively less, and the requirement on drilling equipment is lower. Meanwhile, on a plurality of stoping working surfaces for extracting coal layer gas by adopting parallel drilling holes, if the gas extraction effect of coal bodies in a certain area is relatively poor, extraction is difficult to reach the standard before stoping, so that the reinforced extraction or supplementary measures are implemented on the area with poor extraction effect by adopting the fan-shaped arranged drilling holes under the condition, and the aim of guaranteeing the safety production of mines is achieved. Therefore, the gas extraction of the coal seam through the fan-shaped holes is still a measure for carrying out gas disaster control on a plurality of mines in China. However, the construction of the sector drilling usually requires a drilling site to be arranged in a coal roadway, the construction period of the drilling site is relatively longer, the engineering quantity is large, and therefore, the cost is higher; in addition, after the gas drilling is constructed in the drilling site, the drilling holes are required to be plugged immediately, and because a plurality of gas extraction drilling holes or even a plurality of gas extraction drilling holes are required to be constructed in the drilling site, the frequency of hole sealing operation is high, and the labor intensity of personnel is also increased. Therefore, taking the gas of the drilling extraction coal seam in the fan-shaped arrangement form as a starting point, a certain proper drilling construction and coal seam gas extraction process are sought, and the problems of long construction period, large engineering quantity and high labor intensity of personnel caused by the need of drilling and plugging for multiple times caused by the need of drilling sites in the conventional drilling extraction gas in the fan-shaped arrangement form are solved, so that the gas extraction coal seam gas extraction method is one of the key technical problems to be solved by the urgent need of coal mine safety and technology workers.
Disclosure of Invention
In view of the above, the invention aims to provide a method for extracting gas by using a sector slot derivative drilling hole, which aims at the problems of long construction period, large engineering quantity and high labor intensity of personnel caused by the need of drilling a drilling field and plugging of multiple drilling holes caused by the need of drilling a drilling field in a conventional sector arrangement mode, adopts a method of combining an angle-adjustable self-swinging device with a slitting construction process, constructs a sector slot in a coal body of a stoping working face, then constructs a sector drilling hole in the coal body through the sector slot by using a drilling machine, places a plurality of extraction pipes with screen hole pipes into the sector slot, immediately performs plugging operation, and connects the extraction pipes with a coal mine underground gas extraction pipe, thereby implementing coal seam gas extraction.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a method for extracting gas from a sector slot derivative borehole, comprising the following steps:
s1: constructing a central guide hole on the coal wall in the stoping face gateway along the direction of inclination of the coal bed by using a drilling machine, wherein the depth of the central guide hole is the boundary of a sector slot to be subsequently constructed; placing the slitting drill bit in the central guide hole and connecting the universal joint with the driving rod; the position of a screw rod on the angle-adjustable self-swinging device is adjusted to drive the rotary sliding block to move in the axial direction of the input rotary rod; 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 rotary rod to rotate, further enabling a spherical four-rod structure to convert rotary motion of the input rotary rod into swing motion of a swing rod, and simultaneously starting a drilling machine, enabling a plurality of finger-shaped couplings to drive a driving rod to generate rotary motion, and further driving a slitting drill to cut coal bodies around a central guide hole under the constraint of a positioning square frame to form an arc; then gradually increasing the driving rod and the pull rod to enable the slitting drill 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 construction of the sector slot is finished, removing the self-swinging device with the adjustable angle, and withdrawing the slitting drill bit and the universal joint from the sector slot; high-pressure air is sent into the sector-shaped slot through a coal mine underground air pressing pipe, and coal scraps in the sector-shaped slot are blown into a crossheading of a stoping face;
s3: after the drilling machine is moved to the fan-shaped slot opening and the drill rod and the drill bit are connected, a plurality of drilling holes are constructed in the coal body along the arc shape of the fan-shaped slot; then the drill rod and the drill bit are withdrawn, and the drilling machine is removed;
s4: placing three extraction pipes with sieve holes into the fan-shaped slot, and expanding 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 clung to two straight line boundaries of the fan-shaped slot, and the other one is the same as the original center guide hole in azimuth; and connecting the coiled pipe with ports of three extraction pipes, and then connecting the coiled pipe with the extraction pipes to realize gas extraction from the sector slot derivative drilling holes.
Further, the step S1 specifically includes the following steps:
s11: according to the field engineering requirement, constructing a central guide hole on the coal wall in the stope face gateway along the direction parallel to the trend of the coal bed by using a drilling machine, wherein the hole depth 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 the slitting drill bit adopted in the subsequent construction of the fan-shaped slot;
s12: then according to the actual situation of the spot, the slitting drill bit is arranged in the central guide hole and is connected with the circular arc triangle rotary block, the universal joint and the driving rod in sequence; the periphery of the circular arc triangle rotating block is provided with a positioning square frame with a square section, and the circular arc triangle rotating block is restrained by the positioning square frame while rotating motion transmitted by the universal joint, so that the coal body around the central guide hole is cut by the slitting drill bit to form a rectangular section; the driving rod is used for driving the slitting drill bit to rotate during construction of the fan-shaped slit, and the other end of the driving rod is connected with the finger-shaped coupling; the finger-shaped coupler transmits the rotary motion of one end through finger-shaped vertical rods arranged on two end faces of the finger-shaped coupler; the position of the screw rod on the self-swinging device with the adjustable adjusting angle is adjusted, so that the sliding block moves in the axial direction of the input rotating rod, and the swinging amplitude of the 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 starting a motor to enable an input rotary rod to rotate, further enabling a spherical four-rod structure to convert rotary motion of input rotation into swing motion of a swing rod, simultaneously starting a drilling machine, enabling a plurality of finger-shaped couplings to drive a driving rod to generate rotary motion, further driving a slitting drill to cut coal bodies around a central guide hole under the constraint of a positioning square frame, and forming a certain arc after cutting; and then gradually increasing the driving rod and the pull rod to enable the slitting drill to gradually cut to a preset position, and finally forming a fan-shaped slot in the coal body of the stope face.
Further, in step S4, the method further includes: injecting the mixed polyurethane slurry into the grouting port to fill the space among the three extraction pipes; cotton yarn mixed with polyurethane slurry is wound on the outer wall of two extraction pipes which are clung to two straight boundaries of the fan-shaped slot, and the two extraction pipes are clung 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 sector slot derivative drill hole, which solves the problems of long construction period, large engineering quantity and high labor intensity of personnel caused by the need of drilling sites for drilling gas extraction in a conventional sector arrangement mode; a method of combining an angle-adjustable self-swinging device with a slitting construction process is adopted, a fan-shaped slot is constructed in a coal body of a stoping face, a drilling machine is used for constructing fan-shaped drilling holes in the coal body through the fan-shaped slot, a plurality of extraction pipes with screen holes are put into the fan-shaped slot, plugging operation is carried out immediately, the extraction pipes are connected with a coal mine underground gas extraction pipeline, and coal seam gas extraction is further carried out. Compared with the prior art, the method for extracting the gas from the sector slot derivative drilling hole has the following advantages:
(1) According to the method for extracting the gas by the special sector slot derivative drilling holes, a special drilling field is not required to be arranged, and the coal seam gas extraction can be realized by only constructing the sector slot and the drilling holes along the circular arc direction of the sector slot, so that the method is small in engineering quantity, short in construction period and low in gas treatment cost;
(2) According to the special method for extracting gas from the sector slot derivative drilling holes, the extraction pipes with the screen hole pipes are placed into the sector slot, polyurethane slurry is injected into the space between the outer wall of the extraction pipe and the inner wall of the sector slot, effective sealing can be achieved only by one grouting and plugging operation, the hole sealing frequency of the conventional sector drilling holes is greatly reduced, the operation period is shortened, and the method has very 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 objects and other advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out in the specification.
Drawings
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in the following preferred detail with reference to the accompanying drawings, in which:
FIG. 1 is a schematic view of a scalloped slot;
FIG. 2 is a schematic illustration of a sector slot derivative borehole;
FIG. 3 is a schematic diagram of the apparatus used in the present method;
FIG. 4 is a schematic diagram of a finger joint configuration;
fig. 5 is a schematic diagram of the rig structure.
Reference numerals: the drilling machine 1, the slitting drill 2, the universal joint 3, the driving rod 4, the angle-adjustable self-swinging device 5, the screw rod 6, the rotary sliding block 7, the input rotary rod 8, the swinging rod 9, the clamping device 10, the finger-shaped coupler 11, the spherical four-rod structure 12, the positioning square frame 13, the pull rod 14, the circular arc triangle rotary block 15, the rotary fixing seat 16, the spring 17 and the screw thread 18.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the illustrations provided in the following embodiments merely illustrate the basic idea of the present invention by way of illustration, and the following embodiments and features in the embodiments may be combined with each other without conflict.
Wherein the drawings are for illustrative purposes only and are shown in schematic, non-physical, and not intended to limit the invention; for the purpose of better illustrating embodiments of the invention, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the size of the actual product; it will be appreciated 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 numbers in the drawings of embodiments of the invention correspond to the same or similar components; in the description of the present invention, it should be understood that, if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc., that indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but not for indicating or suggesting that the referred device or element must have a specific azimuth, be constructed and operated in a specific azimuth, so that the terms describing the positional relationship in the drawings are merely for exemplary illustration and should not be construed as limiting the present invention, and that the specific meaning of the above terms may be understood by those of ordinary skill in the art according to the specific circumstances.
Referring to fig. 1 to 5, the invention provides a method for extracting gas from a sector slot derivative drill hole, which comprises the following steps:
s1: according to the field engineering requirement, constructing a central guide hole on the coal wall in the stope face gateway along the direction of inclination of the coal seam by using a drilling machine 1, wherein the hole depth is the boundary of a sector slot for subsequent construction; then according to the actual situation of the spot, the slitting drill 2 is placed in the central guide hole, and the universal joint 3 and the driving rod 4 are connected; the position of the screw rod 6 on the self-swinging device 5 with the adjustable angle is adjusted to drive the rotary sliding block 7 to move in the axial direction of the input rotary rod 8, so that the swinging amplitude of the swinging rod 9 under the working condition is ensured to meet the engineering requirement; and simultaneously connecting the driving rod 4 with the clamping device 10 of the drilling machine 1 through a plurality of finger-shaped couplings 11; then an explosion-proof motor is started to enable the input rotary rod 8 to rotate, the spherical four-rod structure 12 is further enabled to convert the rotary motion of the input rotary rod 8 into the swing of the swing rod 9, meanwhile, the drilling machine 1 is started, the plurality of finger-shaped couplings 11 are enabled to drive the driving rod 4 to generate rotary motion, and then the slitting drill 2 is driven to cut coal bodies around the central guide hole under the constraint of the positioning block 13, and a certain arc is formed after the slitting drill is cut; then the driving rod 4 and the pull rod 14 are gradually increased to enable the slitting drill 2 to gradually cut to a preset position, and finally a sector slot is formed in the coal body of the stope face. The step S1 specifically comprises the following steps:
s11: according to the field engineering requirement, a drilling machine 1 is used for constructing a central guide hole on the coal wall in the stope face gateway along the direction parallel to the trend of the coal bed, and the hole depth 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 the slitting drill bit adopted in the subsequent construction of the fan-shaped slot;
s12: then according to the actual situation of the spot, the slitting drill 2 is arranged in the central guide hole and is sequentially connected with the circular arc triangle rotary block 15, the universal joint 3 and the driving rod 4, wherein the universal joint 3 and the driving rod 4 are connected through the rotary fixing seat 16; a positioning square 13 with a square cross section is arranged on the periphery of the circular arc triangle rotary block 15, and the circular arc triangle rotary block 15 is restrained by the positioning square 13 while rotating motion transmitted by the universal joint 3, so that the coal body around the central guide hole is cut by the slitting drill 2 to form a rectangular cross section; the driving rod 4 is used for driving the slitting drill bit 2 to rotate when the fan-shaped slot is constructed, and the other end of the driving rod 4 is connected with the finger-shaped coupling 11; the finger-shaped coupler 11 transmits the rotary motion of one end through finger-shaped uprights arranged on two end faces of the finger-shaped coupler 11; the position of the screw rod 6 on the self-swinging device 5 with the adjustable adjusting angle is adjusted, so that the rotary sliding block 7 moves in the axial direction of the input rotary rod 8, and the swinging amplitude of the swinging rod 9 under the working condition is ensured to meet engineering requirements. In the angularly adjustable self-swinging device 5 disclosed in this embodiment, the angular rocking lever is adjustable, and the spherical four-bar structure 12 converts the input rotation into angular vibration of the rocking lever. The screw rod 6 axially moves the rotary slide block 7, so that the output angle of the rocker is changed. The screw rod 6, the rotary slide block 7, the input rotary 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 the clamping device 10 of the drilling machine 1 through a plurality of finger-shaped couplings 11; then, starting a motor to enable the input rotary rod 8 to rotate, further enabling the spherical four-rod structure 12 to convert the rotary motion of the input rotary rod 8 into the swing of the swing rod 9, and simultaneously starting the drilling machine 1, enabling the plurality of finger-shaped couplings 11 to drive the driving rod 4 to generate rotary motion, further driving the slitting drill 2 to cut coal bodies around the central guide hole under the constraint of the positioning square frame 13, and forming a certain arc after cutting; the step-growth driving rod 4 and the pull rod 14 then enable the slitting drill 2 to gradually cut to a preset position, and finally a sector slot is formed in the coal body of the stope face. The pull rod 14 is also provided with a spring 17 and a thread 18, and the thread 18 is used for being in threaded connection with a swinging rod 19.
S2: after the construction of the sector slot is finished, the angle-adjustable self-swinging device 5 is removed immediately, and the slitting drill 2, the universal joint 3 and the like are withdrawn from the sector slot; then, the underground air pressing pipe of the coal mine is sent into the fan-shaped slot to enable high-pressure air to enter the fan-shaped slot, and coal scraps in the fan-shaped slot are blown into a cis-slot of a stoping face;
s3: after the drilling machine 1 is moved to the sector slot opening and the drill rod and the drill bit are connected, a plurality of drilling holes are constructed in the coal body along the arc shape of the sector slot according to the construction requirement until the number of the constructed drilling holes reaches the construction requirement; then, the drill rod and the drill bit are withdrawn, and the drilling machine is removed;
s4: placing three extraction pipes with sieve holes into the fan-shaped slot, expanding the three extraction pipes along the fan-shaped slot, tightly adhering two extraction pipes to two straight line boundaries of the fan-shaped slot, and ensuring that the other extraction pipe has the same direction as the original center guide hole; filling the space among three extraction pipes with the mixed polyurethane slurry by injecting the polyurethane slurry into the grouting port; the cotton yarn adhered with the mixed polyurethane slurry is wound on the outer wall of the two extraction pipes which are clung to the two straight line boundaries of the fan-shaped slot, so that the two extraction pipes are clung to the coal wall of the fan-shaped slot along with the reaction of the polyurethane slurry. The fan-shaped slot is effectively sealed, the coiled pipe is connected with the ports of the three extraction pipes, and then the coiled pipe is connected with the extraction pipes, so that the gas extraction from the drill holes derived from the fan-shaped slot is realized.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present invention, which is intended to be covered by the claims of the present invention.
Claims (3)
1. A method for extracting gas from a sector slot derivative drill hole 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 stoping face gateway along the direction of inclination of the coal bed by using a drilling machine, wherein the depth of the central guide hole is the boundary of a sector slot to be subsequently constructed; placing the slitting drill bit in the central guide hole and connecting the universal joint with the driving rod; the position of a screw rod on the angle-adjustable self-swinging device is adjusted to drive the rotary sliding block to move in the axial direction of the input rotary rod; 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 rotary rod to rotate, further enabling a spherical four-rod structure to convert rotary motion of the input rotary rod into swing motion of a swing rod, and simultaneously starting a drilling machine, enabling a plurality of finger-shaped couplings to drive a driving rod to generate rotary motion, and further driving a slitting drill to cut coal bodies around a central guide hole under the constraint of a positioning square frame to form an arc; then gradually increasing the driving rod and the pull rod to enable the slitting drill 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 construction of the sector slot is finished, removing the self-swinging device with the adjustable angle, and withdrawing the slitting drill bit and the universal joint from the sector slot; high-pressure air is sent into the sector-shaped slot through a coal mine underground air pressing pipe, and coal scraps in the sector-shaped slot are blown into a crossheading of a stoping face;
s3: after the drilling machine is moved to the fan-shaped slot opening and the drill rod and the drill bit are connected, a plurality of drilling holes are constructed in the coal body along the arc shape of the fan-shaped slot; then the drill rod and the drill bit are withdrawn, and the drilling machine is removed;
s4: placing three extraction pipes with sieve holes into the fan-shaped slot, and expanding 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 clung to two straight line boundaries of the fan-shaped slot, and the other one is the same as the original center guide hole in azimuth; and connecting the coiled pipe with ports of three extraction pipes, and then connecting the coiled pipe with the extraction pipes to realize gas extraction from the sector slot derivative drilling holes.
2. The method of extracting gas from a scalloped slot derivative borehole of claim 1, wherein: the step S1 specifically comprises the following steps:
s11: according to the field engineering requirement, constructing a central guide hole on the coal wall in the stope face gateway along the direction parallel to the trend of the coal bed by using a drilling machine, wherein the hole depth 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 the slitting drill bit adopted in the subsequent construction of the fan-shaped slot;
s12: then according to the actual situation of the spot, the slitting drill bit is arranged in the central guide hole and is connected with the circular arc triangle rotary block, the universal joint and the driving rod in sequence; the periphery of the circular arc triangle rotating block is provided with a positioning square frame with a square section, and the circular arc triangle rotating block is restrained by the positioning square frame while rotating motion transmitted by the universal joint, so that the coal body around the central guide hole is cut by the slitting drill bit to form a rectangular section; the driving rod is used for driving the slitting drill bit to rotate during construction of the fan-shaped slit, and the other end of the driving rod is connected with the finger-shaped coupling; the finger-shaped coupler transmits the rotary motion of one end through finger-shaped vertical rods arranged on two end faces of the finger-shaped coupler; the position of the screw rod on the self-swinging device with the adjustable adjusting angle is adjusted, so that the sliding block moves in the axial direction of the input rotating rod, and the swinging amplitude of the 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 starting a motor to enable an input rotary rod to rotate, further enabling a spherical four-rod structure to convert rotary motion of input rotation into swing motion of a swing rod, simultaneously starting a drilling machine, enabling a plurality of finger-shaped couplings to drive a driving rod to generate rotary motion, further driving a slitting drill to cut coal bodies around a central guide hole under the constraint of a positioning square frame, and forming a certain arc after cutting; and then gradually increasing the driving rod and the pull rod to enable the slitting drill 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 of extracting gas from a scalloped slot derivative borehole of claim 1, wherein: in step S4, further includes: injecting the mixed polyurethane slurry into the grouting port to fill the space among the three extraction pipes; cotton yarn mixed with polyurethane slurry is wound on the outer wall of two extraction pipes which are clung to two straight boundaries of the fan-shaped slot, and the two extraction pipes are clung to the coal wall of the fan-shaped slot along with the reaction of the polyurethane slurry.
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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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