CN114233370A - Integrated extraction method for repairing and interconnecting collapse of gas extraction drill hole - Google Patents
Integrated extraction method for repairing and interconnecting collapse of gas extraction drill hole Download PDFInfo
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- CN114233370A CN114233370A CN202210054364.2A CN202210054364A CN114233370A CN 114233370 A CN114233370 A CN 114233370A CN 202210054364 A CN202210054364 A CN 202210054364A CN 114233370 A CN114233370 A CN 114233370A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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 DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/002—Survey of boreholes or wells by visual inspection
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/002—Drilling with diversely driven shafts extending into the borehole
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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
Abstract
The invention relates to an integrated extraction method for collapse repair and interconnection of gas extraction drill holes, belonging to the technical field of coal mine safety, aiming at the problem that the gas extraction drill holes in a soft coal seam are easy to deform and collapse, so that the mine gas extraction efficiency is low, a special universal joint connection mode is adopted for connecting a drill rod and a dredging drill bit, and the drill rod and the dredging drill bit are driven by a drilling machine to rotate so as to cut coal bodies at the collapse position, so that the functional attributes of the gas extraction drill holes are recovered; furthermore, by means of a method that a special interconnected drill bit is matched with the sieve hole pipe, the collapsed gas extraction drill hole and the adjacent gas extraction drill hole are interconnected, the sieve hole pipe is reserved in the interconnected drill hole, the permeability characteristic of the coal body in the influence range of the gas extraction drill hole is improved, the path of gas migration in the coal body is increased, and the improvement of the mine gas extraction efficiency is facilitated.
Description
Technical Field
The invention belongs to the technical field of coal mine safety, and relates to an integrated gas extraction method for collapse repair and interconnection of a gas extraction drilled hole.
Background
Recently, the global market is trapped in 'coal shortage, gas shortage, oil shortage and electricity shortage', so that natural gas, power coal and electricity prices are continuously broken through the historical new and high prices. The extremely severe global energy supply situation causes huge pressure to China. The yield and the supply of coal are increased in time from a large office in China, and the production development and the welfare of people in China are guaranteed. Coal plays an important role in guaranteeing the energy safety of China all the time. Coal mine gas is also called coal bed gas, which is a gas with methane as a main component and exists in a coal bed of a mine, and is desorbed and seeped from the solid surface of coal to a mining space in the mine along with the propulsion of underground mining engineering and the mining of coal. When the concentration of the gas is in a certain range, if an ignition source exists, the gas explosion accident of a coal mine is caused, and meanwhile, the coal and gas outburst accident caused by the gas is a main factor for restraining the exertion of advanced coal mining technology in China for a long time. In addition, when the gas is discharged to the atmosphere from the underground coal mine, the greenhouse effect of the mining area is intensified. Therefore, in order to ensure safe and efficient production of mines, gas disasters are mainly managed in coal mines in China by adopting a gas extraction method. However, the occurrence conditions of coal mine gas geology in China are very complex, most coal seams of mines belong to high-gas or coal and gas outburst coal seams, and the coal seams are soft, so that the coal seams are prone to serious deformation and collapse during the service period of the gas extraction drill hole, the gas extraction drill hole is further blocked, and the mine gas extraction efficiency is affected. Therefore, the repair of the collapsed gas extraction drill hole by carrying out related technical research is one of hot spots traced by coal mine safety workers in China in recent years. Meanwhile, the collapse time of the gas extraction drill holes constructed in the soft coal seam with high gas or coal and gas outburst is not fixed, and the collapse time has very obvious burst and accidental properties for the whole stope face, so that the corresponding gas extraction drill holes are communicated on the premise of considering the collapse repair of the gas extraction drill holes under the condition, and further a criss-cross drill hole network is formed, and the key point for effectively improving the gas extraction efficiency of the mine is that the collapse time is not fixed.
Disclosure of Invention
In view of the above, the invention aims to provide an integrated extraction method for repairing and interconnecting collapsed gas extraction drill holes, aiming at the difficult problems that the gas extraction drill holes in a soft coal seam are easy to deform and collapse and the collapse has outburst and contingency to cause the mine gas extraction efficiency, a dredging drill bit is matched with a repairing pipeline to penetrate through coal at the collapsed position, so that the gas extraction drill holes are dredged; and then, through the matching of the interconnected drill bit and the sieve hole pipe, the coal body between the drill holes adjacent to the gas extraction drill hole is drilled, so that a drill hole network is formed between the collapsed gas extraction drill hole and the adjacent drill hole, the permeability of the coal body within the influence range of the gas extraction drill hole is further improved, and the gas extraction efficiency of the mine is improved.
In order to achieve the purpose, the invention provides the following technical scheme:
an integrated extraction method for collapse repair and interconnection of a gas extraction drill hole comprises the following steps:
s1: constructing a gas extraction drill hole in the coal seam, immediately plugging the drill hole after the construction is finished, and installing an extraction pipe; then, the gas in the drill hole enters a gas extraction pipeline through the extraction pipe and the connecting hose; after the gas extraction is carried out for a certain time, if the gas concentration in a certain gas extraction drill hole is close to 0 and the gas concentration value of an adjacent drill hole is close to the gas concentration in the coal bed, the fact that collapse occurs in the gas extraction drill hole can be judged; then removing the connection between the three-way pipe and the connecting hose, placing the borehole peeping instrument in the gas extraction borehole, and detecting and determining the position of collapse; then respectively connecting the four-way joint with a connecting hose, a water and slag removal device and a connecting flange, and putting the PE repairing pipeline into the gas extraction drill hole through one end of the T-shaped three-way joint and the other end of the four-way joint until the PE repairing pipeline reaches the position where collapse occurs; then, the dredging drill bit is connected with a dredging end drill rod, a connecting drill rod and a tail drill rod through a plurality of universal joints, and the tail drill rod is clamped through a drill rod clamping device on the drilling machine;
s2: then, connecting the isolation bag with one end of the T-shaped tee joint and the outer ring of the tail bearing, and simultaneously connecting the other end of the T-shaped tee joint with compressed air; then, starting a drilling machine and pressing air to enable the explosion-proof motor to drive the tail drill rod, the connecting drill rod, the end part dredging drill rod and the dredging drill bit to rotate, and further cutting the collapsed coal body; the compressed air drives the coal scraps cut by the dredging drill bit to an annular space in the connecting hose and the PE repairing pipeline through flowing in the PE repairing pipeline until the coal scraps enter a water and slag removing device connected with the lower end of the cross joint under the action of gravity, and the gas flowing out in the drilling process of the dredging drill bit flows into the upper end of the cross joint through the annular space of the connecting hose and the PE repairing pipeline under the action of negative pressure of an extraction pipe network system and then enters a gas extraction pipeline;
s3: after the dredging drill bit drills for a certain distance, the drilling machine is immediately stopped, the compressed air is closed, the connection between the PE repairing pipeline and the T-shaped tee joint is removed, then the PE repairing pipeline is pushed to move towards the bottom of the gas extraction drill hole, if the movement is blocked, the fact that the coal body at the collapse position is not cut completely is indicated, and then the PE repairing pipeline is connected with the T-shaped tee joint; then, the drilling machine is started again, so that the explosion-proof motor drives the tail drill rod, the connecting drill rod, the end part dredging drill rod and the dredging drill bit to rotate, and further, the coal body at the collapse position is cut again; when the PE repairing pipeline is conveyed into the gas extraction drill hole, the length of the PE repairing pipeline entering the gas extraction drill hole is close to that of the gas extraction drill hole, and it is indicated that all the collapsed parts of the gas extraction drill hole are repaired; at the moment, the connection between the isolation bag and the tail bearing can be disassembled, the connection between the drill rod clamping device and the tail drill rod is disassembled, and the drill rod, the dredging drill bit, the end part dredging drill rod and the PE repairing pipeline which enter the gas extraction drill hole can be rapidly withdrawn from the gas extraction drill hole;
s4: placing and gradually conveying the interconnection guide pipeline to a position needing interconnection in the gas extraction drill hole, then connecting the sieve hole pipe with the connecting pipe through threads, and conveying the sieve hole pipe to the position needing interconnection in the gas extraction drill hole; connecting an interconnected drill bit with an interconnected end drill rod, connecting a plurality of connecting drill rods with the interconnected end drill rods through universal joints, gradually sending the interconnected drill bit to a position needing to be interconnected through the connection of the connecting drill rods and the universal joints, wherein the interconnected drill bit can drill along the direction of a certain inclination angle due to the fact that the front end of an interconnected guide pipeline has the certain inclination angle, and the collapsed and repaired gas extraction drill hole is interconnected with the adjacent drill hole;
s5: the interconnected guide pipelines have the same function as the PE repairing pipelines in the collapse repairing, and the connecting method is also the same; during interconnection operation, a drilling machine is started, so that the explosion-proof motor drives the tail drill rod, the connecting drill rod, the universal joint, the interconnection end drill rod and the interconnection drill bit to rotate, and then coal bodies among gas extraction drill holes are cut and drilled; the cut coal scraps are transported to a water and slag removing device arranged at the hole of the gas extraction drill hole through an annular space of the sieve hole pipe and the interconnected guide pipeline, and gas released by the coal body in the drilling process of the interconnected drill bit enters a gas extraction pipeline at the upper end of the cross joint;
s6: the interconnected drill bit continuously drills, the sieve tube is driven to enter the coal body, after the interconnected drill bit drills to a preset position, the push-pull function of the drilling machine is started, the drill rod moves towards the direction of the orifice of the drilled hole, and then the sieve tube is retained in the interconnected drilled hole; according to the actual situation of the on-site engineering, S4-S6 can be repeated, 2-3 interconnected drill holes are constructed, the collapsed and repaired gas extraction drill holes and 1-2 adjacent gas extraction drill holes are interconnected through the interconnected drill holes, and a network of the gas extraction drill holes is formed; after the construction of the interconnected drilling is finished, the interconnected drill bit, the drill rod and the interconnected guide pipeline can be withdrawn, the connecting hose is connected with the three-way pipe, the other two ends of the three-way pipe are respectively connected with the gas extraction pipeline and the water and slag removal device, and then gas extraction is continuously carried out.
Further, step S1 specifically includes the following steps:
s11: constructing gas extraction drilled holes in a transportation gateway or a return air gateway of a coal mine underground recovery working face, and placing extraction pipes in the gas extraction drilled holes after the construction is finished, wherein the extraction pipes are made of PVC or PE materials, and the antistatic and flame-retardant properties of the extraction pipes meet the underground practical requirements of the coal mine; then, adopting a high polymer material or other hole sealing materials to seal the gas extraction drilled hole, wherein the depth and the length of a hole sealing section from the wall of the roadway to the bottom direction of the drilled hole are more than 20 m; after the gas extraction drill hole is plugged, immediately connecting the connecting hose with an extraction pipe, so that gas in the drill hole enters a gas extraction pipeline through the extraction pipe and the connecting hose; further, the gas extraction pipeline is finally connected with a gas extraction pump arranged on the ground, and negative pressure is provided by the gas extraction pump, so that gas flows in a pipe network formed by the extraction pipelines laid under the coal mine; the method comprises the following steps that a sampling hole is formed in a connecting hose or the surface of an extraction pipe exposed out of a gas extraction drilled hole, and further the sampling hole is used for providing a gas collection channel for a special instrument for measuring the concentration of extracted gas in the drilled hole;
s12: after the constructed gas extraction drill hole is merged into a pipe network formed by gas extraction pipelines under the coal mine, starting to perform extraction, and then detecting the concentration of gas flowing out of the drill hole through a sampling hole every day; when the gas concentration in a certain gas extraction drill hole approaches to 0 and the gas concentration value of an adjacent drill hole approaches to the concentration of the original gas in the coal bed, the collapse of the gas extraction drill hole can be judged;
s13: then, removing the connection between the three-way pipe and the connecting hose, placing the borehole peeping instrument in the gas extraction borehole, detecting and determining the position where collapse occurs, and recording the distance between the position and the orifice of the gas extraction borehole; further, selecting a PE repair pipeline with the length slightly higher than the value according to the distance; furthermore, the opening of the PE repairing pipeline is provided with a reducing section with a certain length, and the function of the reducing section is to improve the flow velocity of compressed air in the PE repairing pipeline, so that coal dust cut by the dredging drill bit can be conveniently sprayed into an annular space between the PE repairing pipeline and the connecting hose; the four-way joint is connected with a connecting hose, a water and slag removing device and a connecting flange respectively, and further, the outer surfaces of the connecting flange and the PE repairing pipeline are also padded with sealing rubber rings, so that air in a roadway is prevented from entering a gas extraction pipeline through a gap between the outer surface of the PE repairing pipeline and an inner ring of the connecting flange, and simultaneously, coal slag or coal dust generated in the subsequent dredging drill bit drilling process is prevented from entering the roadway through the gap between the outer surface of the PE repairing pipeline and the inner ring of the connecting flange to influence the health of operators; putting the PE repairing pipeline into the gas extraction drill hole through one end of the T-shaped tee joint and the other end of the tee joint until the PE repairing pipeline reaches the position where collapse occurs; furthermore, the other end of the T-shaped tee joint is connected with compressed air, and an isolation bag is required to be arranged at the inserted end of the PE repair pipeline; the isolation bag is tightly attached to the surface of a straight pipe of the T-shaped tee joint through iron wire rolling and is used for being matched with a tail bearing arranged on the tail drill rod, so that the isolation bag can reduce the leakage of compressed air in the rotating process of the tail drill rod; meanwhile, the overall size of the isolation bag needs to be capable of adapting to the displacement generated when the PE repairing pipeline enters the gas extraction drill hole;
s14: then, the dredging drill bit is connected with a dredging end drill rod, a connecting drill rod and a tail drill rod through a plurality of universal joints, and the tail drill rod is clamped through a drill rod clamping device on the drilling machine; further, the dredging drill bit is connected with a drill rod at the dredging end part through threads; bearings are further arranged on the dredging end drill rod and the connecting drill rod, and the inner rings of the bearings are fixed on the outer walls of the dredging end drill rod and the connecting drill rod; furthermore, the bearing has the effect that the inner ring of the bearing is driven to rotate by the rotary motion of the dredging end drill rod and the connecting drill rod, and the balls in the bearing are in contact with the outer ring of the bearing, so that the influence on the rotary motion of the dredging end drill rod and the connecting drill rod due to collision with the inner wall of the PE repairing pipeline in the rotary motion process can be effectively prevented; furthermore, the universal joint has the effect that the dredging drill bit, the drilling rod at the dredging end part and the connecting drilling rod can still rotate under the action of the drilling machine under the condition that the PE repairing pipeline is bent, so that the coal at the collapse position can be cut continuously and stably by the dredging drill bit.
Further, step S2 specifically includes the following steps:
s21: furthermore, a groove is formed in the outer ring of the tail bearing, so that the isolation bag can be fixed and tightly rolled in the groove of the outer ring of the tail bearing through an iron wire; the inner ring of the tail bearing is fixed on the outer wall of the tail drill rod and rotates along with the tail drill rod in the rotating process of the tail drill rod; connecting an isolation bag with one end of the T-shaped tee joint and an outer ring of a tail bearing, and connecting the other end of the T-shaped tee joint with compressed air;
s22: then, starting a drilling machine and pressing air to enable the explosion-proof motor to drive the tail drill rod, the connecting drill rod, the end part dredging drill rod and the dredging drill bit to rotate, and further cutting the collapsed coal body; the air pressure of the compressed air is 0.5-0.7 MPa, and the compressed air enters the PE restoration pipeline through the T-shaped tee joint and can drive coal dust cut by the dredging drill bit to an annular space in the connecting hose and the PE restoration pipeline; because the upper end of the cross joint is connected with the extraction pipeline, the gas pressure in the extraction pipeline is lower than the atmospheric pressure in a roadway, and the compressed air gas pressure in the PE repair pipeline is higher than the atmospheric pressure in the roadway, the coal dust cut by the dredging drill bit is driven by the pressure difference between the upper end of the cross joint and the lower end of the cross joint to enter an annular space in the connecting hose and the PE repair pipeline until the coal dust enters a water and slag removal device connected with the lower end of the cross joint under the action of gravity, and therefore the health of operators in construction sites in the roadway is guaranteed;
s23: meanwhile, in the process of dredging the drill bit to drill, the gas accumulated due to blockage behind the collapse position flows to the orifice direction of the gas extraction drill hole due to the change of the sealing property of the coal body at the collapse position, so that the gas flows into the upper end of the cross joint through the annular space of the connecting hose and the PE repairing pipeline under the action of the negative pressure of the extraction pipe network system and then enters the gas extraction pipeline, and the gas is effectively prevented from entering a roadway.
Further, step S3 specifically includes the following steps:
s31: when the dredging drill bit rotates to cut the coal body at the collapse position, the push-pull function of the drilling machine is synchronously started, so that the dredging drill bit can also move towards the bottom of the gas extraction drill hole; after the dredging drill bit drills for a certain distance, the drilling machine is stopped immediately, the compressed air is closed, the connection between the PE repairing pipeline and the T-shaped tee joint is removed, then the PE repairing pipeline is pushed to move towards the bottom of the gas extraction drill hole, if the movement is blocked, the fact that the coal at the collapse position is not cut completely is indicated, the PE repairing pipeline is connected with the T-shaped tee joint, the drilling machine is continuously started, the explosion-proof motor rotates to drive the dredging drill bit to rotate, and meanwhile, the push-pull function of the drilling machine is started, so that the dredging drill bit can also move towards the bottom of the gas extraction drill hole;
s32: continuously repeating S31 until the PE repairing pipeline is conveyed into the gas extraction drill hole, wherein the length of the PE repairing pipeline entering the gas extraction drill hole is close to that of the gas extraction drill hole, and the fact that all the collapsed parts of the gas extraction drill hole are repaired is indicated; at the moment, the connection between the isolation bag and the tail bearing can be disassembled, the connection between the drill rod clamping device and the tail drill rod is disassembled, and the drill rod, the dredging drill bit and the dredging end drill rod entering the gas extraction drill hole can be rapidly withdrawn from the gas extraction drill hole.
Further, step S4 specifically includes the following steps:
s41: the method comprises the following steps that an interconnection guide pipeline is placed and gradually conveyed to a position, needing interconnection, in a gas extraction drill hole, wherein the front end of the interconnection guide pipeline has a certain inclination angle, and an interconnection drill bit can enter a coal body along the direction of the inclination angle, so that the gas extraction drill hole after collapse repair is interconnected with an adjacent drill hole; meanwhile, the interconnected guide pipeline is connected with the four-way joint and the T-shaped three-way joint, and the function of the interconnected guide pipeline is the same as that of a PE repair pipeline in collapse repair operation;
s42: then, connecting the interconnected drill bit with the interconnected end drill rod, connecting the drill rods with the interconnected end drill rod through universal joints, and simultaneously connecting the sieve hole pipe with the connecting pipe through threads; gradually sending the interconnected drill bits to positions needing interconnection through connection of the drill rods and the universal joints; furthermore, two springs are arranged in the connecting pipe in the 180-degree direction, and when the drill rod at the end part of the interconnection carrying the interconnected drill bit is not combined with the connecting pipe, the two springs are in a stretching state and can restrain the near quarter arc stop block on the movable limiting block in an arc groove formed in the inner wall of the connecting pipe; when an interconnected end drill rod carrying an interconnected drill bit is combined with the connecting pipe, balls arranged in a groove of a circumferential fixed stop block on the interconnected end drill rod are contacted with an inclined plane on the movable limiting block, and then the movable limiting block is pushed to move towards the hole depth direction, so that the movable limiting block is fixed by the draw hook; meanwhile, in the rotary drilling process of the interconnected drill bit and the interconnected end drill rod, the balls are arranged in the grooves of the circumferential fixed stop blocks and can roll in the grooves, so that the continuous rotary drilling of the interconnected drill bit and the interconnected end drill rod is ensured.
The invention has the beneficial effects that:
the invention provides an integrated extraction method for collapse repair and interconnection of gas extraction drill holes, aiming at the problem that the gas extraction efficiency of a mine is low due to the fact that gas extraction drill holes in a soft coal seam are easy to deform and collapse, a special universal joint is adopted to connect a drill rod and a dredging drill bit, and the drill rod and the dredging drill bit are driven by a drilling machine to rotate so as to cut coal bodies at the collapsed positions, so that the functional attributes of the gas extraction drill holes are recovered; furthermore, by means of a method that a special interconnected drill bit is matched with a sieve hole pipe, the collapsed gas extraction drill hole and the adjacent gas extraction drill hole are interconnected, the sieve hole pipe is reserved in the interconnected drill hole, the permeability of a coal body in the influence range of the gas extraction drill hole is improved, the path of gas migration in the coal body is increased, and the improvement of the mine gas extraction efficiency is facilitated, and compared with the conventional method, the integrated extraction method for repairing and interconnecting the collapse of the gas extraction drill hole has the following advantages:
1. the invention discloses a unique integrated extraction method for collapse repair and interconnection of gas extraction drill holes, which fully considers the problems that gas extraction drill holes in a soft coal seam are easy to deform and collapse, adopts a unique universal joint to connect a dredging drill bit with a connecting drill rod and place the dredging drill bit in a PE (polyethylene) repair pipeline, thereby ensuring that the collapsed coal body can be drilled and cut under any drilling hole deformation condition in the process of driving the drill rod and the dredging drill bit to rotate by a drilling machine, and further effectively dredging the collapsed gas extraction drill holes.
2. According to the integrated extraction method for collapse repair and interconnection of the gas extraction drill holes, after the collapsed gas extraction drill holes are dredged and repaired, the collapsed gas extraction drill holes and the adjacent gas extraction drill holes can be interconnected through a method of matching a special interconnection drill bit with the sieve hole pipes, and the sieve hole pipes are reserved in the interconnection drill holes, namely: in the subsequent extraction process, when adjacent gas extraction drill holes collapse, good channels can be provided for the outflow of gas through the interconnected drill holes, the permeability of the coal body in the influence range of the gas extraction drill holes is improved, the gas migration path in the coal body is increased, and the improvement of the mine gas extraction efficiency is facilitated.
3. According to the integrated extraction method for repairing collapsed gas extraction drill holes and interconnecting the collapsed gas extraction drill holes, the PE pipelines are used as drilling channels in the process of repairing collapsed gas extraction drill holes and interconnecting the collapsed gas extraction drill holes, stable and continuous drilling operation can be effectively guaranteed, and drill cuttings can be effectively removed through the T-shaped tee joint and the compressed air connection; and the cross joint arranged on the connecting hose is also connected with an extraction pipeline laid underground, so that the effective transmission of coal body escaping gas in the gas extraction drilling hole repairing and interconnecting operation process can be realized, and the threat to the personnel safety caused by the gas gushing into the roadway is eliminated.
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 connection diagram of a gas extraction stage device in step S1 of the method;
FIG. 2 is a schematic diagram of the apparatus connection during the probing phase of step S1;
FIG. 3 is a view of a gimbal structure;
FIG. 4 is a schematic view of a connecting drill rod structure;
FIG. 5 is a view of the interconnected end drill pipe configuration;
FIG. 6 is a schematic diagram of a gas extraction borehole scene;
fig. 7 is a schematic view of an interconnecting pilot line.
Reference numerals: the device comprises a gas extraction drill hole 1, an extraction pipe 2, a connecting hose 3, a three-way pipe 4, a four-way joint 5, a connecting flange 6, a PE repair pipeline 7, a T-shaped three-way pipe 8, a dredging drill bit 9, a dredging end drill rod 10, a connecting drill rod 11, a tail drill rod 12, a universal joint 13, a drill rod clamping device 14, a roadway wall 15, a drill hole bottom 16, a sealing rubber ring 17, a collapse part 18, an isolation bag 19, a tail bearing 20, a drilling machine 21, a bearing inner ring 22, a ball 23, a bearing outer ring 24, a bearing retainer 25, an air vent 26, an explosion-proof motor 27, an interconnection guide pipeline 28, a sieve hole pipe 29, a connecting pipe 30, an interconnection drill bit 31, an interconnection end drill rod 32, a spring 33, a movable limiting block 34, a circumferential fixed stop block 35, a ball 36, a drag hook 37, a sieve hole 38 and a movable track 39.
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 7, the invention provides an integrated gas extraction method for collapse repair and interconnection of a gas extraction borehole, comprising the following steps:
s1: constructing a gas extraction drill hole 1 in a coal seam, immediately plugging after the construction of the drill hole is finished, and installing an extraction pipe 2; then, the gas in the drill hole is connected with the extraction pipe 2 through the connecting hose 3, so that the gas enters a gas extraction pipeline through the extraction pipe 2 and the connecting hose 3; after the gas extraction is carried out for a certain time, if the concentration of the gas in a certain gas extraction borehole 1 is found to be close to 0, and the concentration of the gas in an adjacent borehole is found to be close to the concentration of the gas in the coal bed, the collapse of the gas extraction borehole 1 can be judged; then the connection between the three-way pipe 4 and the connecting hose 3 is removed, the borehole peeping instrument is placed in a gas extraction borehole, and the position of collapse is detected and determined; then the four-way joint 5 is respectively connected with a connecting hose 3, a water and slag removing device and a connecting flange 6, and a PE repairing pipeline 7 is placed into the gas extraction drill hole 1 through one end of a T-shaped three-way joint 8 and the other end of the four-way joint 5 until the position where collapse occurs is reached; then, the dredging drill bit 9 is connected with a dredging end drill rod 10, a connecting drill rod 11 and a tail drill rod 12 through a plurality of universal joints 13, and the tail drill rod 12 is clamped through a drill rod clamping device 14 on a drilling machine 21; step S1 specifically includes the following steps:
s11: and constructing a gas extraction drilled hole 1 in a transportation gateway or a return air gateway of a coal mine underground recovery working face, and placing an extraction pipe 2 in the gas extraction drilled hole after the construction is finished. Optionally, the extraction pipe 2 is made of PVC or PE, and the antistatic and flame-retardant properties meet the practical requirements of the underground coal mine; then, adopting a high polymer material or other hole sealing materials to seal the gas extraction drill hole 1, wherein the depth and the length of a hole sealing section 14 from the roadway wall 15 to the direction of a drill hole bottom 16 are more than 20 m; after the gas extraction drill hole 1 is plugged, the connecting hose 3 is connected with the extraction pipe 2, so that gas in the drill hole enters a gas extraction pipeline through the extraction pipe 2 and the connecting hose 3. Optionally, the gas extraction pipeline is finally connected with a gas extraction pump arranged on the ground, and negative pressure is provided by the gas extraction pump, so that gas flows in a pipe network formed by the extraction pipelines laid under the coal mine; and a sampling hole is formed in the surface of the connecting hose 3 or the surface of the extraction pipe 2 exposed out of the gas extraction borehole 1. Optionally, the sampling hole is used for providing a gas collecting channel for a special instrument for measuring the concentration of extracted gas in the drilled hole;
s12: after the constructed gas extraction drill hole 1 is merged into a pipe network formed by gas extraction pipelines under a coal mine, starting to perform extraction, and then detecting the concentration of gas flowing out of the drill hole through a sampling hole every day; when the gas concentration in a certain gas extraction drill hole approaches to 0 and the gas concentration value of an adjacent drill hole approaches to the concentration of the original gas in the coal bed, the collapse of the gas extraction drill hole can be judged;
s13: then removing the connection between the three-way pipe 4 and the connecting hose 3, placing the borehole peeping instrument in the gas extraction borehole, detecting and determining the position where collapse occurs, and recording the distance between the position and the orifice of the gas extraction borehole 1; optionally, selecting a PE repair line 7 having a length slightly greater than this value according to this distance; optionally, the opening of the PE repairing pipeline 7 has a diameter-reducing section with a certain length, which is used for increasing the flow rate of compressed air in the PE repairing pipeline 7, so that the coal dust cut by the dredging drill bit 9 is conveniently injected into an annular space between the PE repairing pipeline 7 and the connecting hose 3; then the cross joint 5 is respectively connected with the connecting hose 3, the water and slag removing device and the connecting flange 6, optionally, the outer surfaces of the connecting flange 6 and the PE repairing pipeline 7 are also padded with a sealing rubber ring 17, which is used for preventing air in a roadway from entering a gas extraction pipeline through a gap between the outer surface of the PE repairing pipeline 7 and the inner ring of the connecting flange 6, and simultaneously preventing coal slag or coal dust generated in the subsequent drilling process of the dredging drill bit 9 from entering the roadway through the gap between the outer surface of the PE repairing pipeline 7 and the inner ring of the connecting flange 6 to influence the health of operators; putting the PE repairing pipeline 7 into the gas extraction borehole 1 through one end of the T-shaped tee joint 8 and the other end of the tee joint 5 until the PE repairing pipeline reaches a collapse position 18; optionally, the other end of the T-shaped tee 8 is connected with compressed air, and an isolation bag 19 is further installed at the inserted end of the PE repairing pipeline 7; the isolation bag 19 is tightly attached to the surface of the straight pipe of the T-shaped tee joint 8 through iron wire rolling and is used for being matched with a tail bearing 20 arranged on the tail drill rod 12, so that the isolation bag 19 can reduce the leakage of compressed air in the rotating process of the tail drill rod 12;
s14: then, the dredging drill bit 9 is connected with a dredging end drill rod 10, a connecting drill rod 11 and a tail drill rod 12 through a plurality of universal joints 13, and the tail drill rod 12 is clamped through a drill rod clamping device 14 on a drilling machine 21; optionally, the pull through bit 9 is threadedly connected to a pull through end drill rod 10; bearings are further arranged on the dredging end drill rod 10 and the connecting drill rod 11 through bearing retainers 25, and bearing inner rings 22 of the bearings are fixed on the outer walls of the dredging end drill rod 10 and the connecting drill rod 11; optionally, the bearing has the effect that the rotational motion of the dredging end drill rod 10 and the connecting drill rod 11 drives the bearing inner ring 22 to rotate, and the balls 23 in the bearing are in contact with the bearing outer ring 24, so that the dredging end drill rod 10 and the connecting drill rod 11 can be effectively prevented from colliding with the inner wall of the PE repairing pipeline 7 in the rotational motion process to influence the rotational motion of the PE repairing pipeline, and the bearing is further provided with the air holes 26. Optionally, the universal joint 13 is used for enabling the dredging drill bit 9, the dredging end drill rod 10 and the connecting drill rod 11 to generate rotary motion under the action of the drilling machine 21 under the condition that the PE repairing pipeline 7 is bent, so that the dredging drill bit 9 can continuously and stably cut the collapsed coal;
s2: then, the isolation bag 19 is connected with one end of the T-shaped tee joint 8 and the outer ring of the tail bearing 20, and the other end of the T-shaped tee joint 8 is connected with compressed air; then, the drilling machine 21 and the compressed air are started, so that the explosion-proof motor 27 drives the tail drill rod 12, the connecting drill rod 11, the end dredging drill rod 10 and the dredging drill bit 9 to rotate, and further the coal body at the collapse position 18 is cut; the compressed air drives the coal scraps cut by the dredging drill bit 9 to an annular space between the connecting hose 3 and the PE repairing pipeline 7 through flowing in the PE repairing pipeline 7 until the coal scraps enter a water and slag removing device connected with the lower end of the cross joint 5 under the action of gravity, and the gas flowing out in the drilling process of the dredging drill bit 9 flows into the upper end of the cross joint through the annular space between the connecting hose 3 and the PE repairing pipeline 7 under the action of negative pressure of an extraction pipe network system and then enters a gas extraction pipeline; step S2 specifically includes the following steps:
s21: optionally, a groove is formed in the outer ring of the tail bearing 20, so that the isolation bag 19 can be fixed and tightly rolled in the groove of the outer ring of the tail bearing 20 through an iron wire; the inner ring of the tail bearing 20 is fixed on the outer wall of the tail drill rod 12, and the inner ring of the tail bearing 20 rotates along with the tail drill rod 12 in the rotating process; connecting an isolation bag 19 with one end of the T-shaped tee joint 8 and an outer ring of a tail bearing 20, and simultaneously connecting the other end of the T-shaped tee joint 8 with compressed air;
s22: then, the drilling machine 21 and the compressed air are started, so that the explosion-proof motor 27 drives the tail drill rod 12, the connecting drill rod 11, the end dredging drill rod 10 and the dredging drill bit 9 to rotate, and further the coal body at the collapse position 18 is cut; the air pressure of the compressed air is 0.5-0.7 MPa, and the compressed air enters the PE repairing pipeline 7 through the T-shaped tee joint 8, so that coal dust cut by the dredging drill bit 9 can be driven to an annular space in the connecting hose 3 and the PE repairing pipeline 7; because the upper end of the cross joint 5 is connected with an extraction pipeline, the gas pressure in the extraction pipeline is lower than the atmospheric pressure in a roadway, and the compressed air gas pressure in the PE repair pipeline 7 is higher than the atmospheric pressure in the roadway, the coal dust cut by the dredging drill bit 9 is driven by the pressure difference between the two to enter the annular space in the connecting hose 3 and the PE repair pipeline 7 until the coal dust enters a water and slag removal device connected with the lower end of the cross joint 5 under the action of gravity, and therefore the health of operators in construction sites in the roadway is guaranteed;
s23: meanwhile, in the process of drilling by the dredging drill bit 9, gas accumulated due to blockage behind the collapse part 18 flows to the direction of the orifice of the gas extraction drill hole 1 due to the change of the sealing property of the coal body at the collapse part 18, so that the gas flows into the upper end of the cross joint 5 through the annular space between the connecting hose 3 and the PE repairing pipeline 7 under the action of negative pressure of an extraction pipe network system and then enters a gas extraction pipeline, and the gas is effectively prevented from entering a roadway.
S3: after the dredging drill bit 9 drills for a certain distance, the drilling machine 21 is stopped immediately, the compressed air is closed, the connection between the PE repairing pipeline 7 and the T-shaped tee joint 8 is removed, then the PE repairing pipeline 7 is pushed to move towards the bottom 16 of the gas extraction drill hole, if the movement is blocked, the fact that the coal at the collapse position 18 is not cut off is shown, the universal joint 13 on the tail drill rod 12 is removed at the moment, the connecting drill rods 11 are connected with the universal joint 13 until the dredging drill bit 9 reaches the position of the cut to be drilled at the next step; then, the drilling machine 21 is started again, so that the explosion-proof motor 27 drives the tail drill rod 12, the connecting drill rod 11, the end part dredging drill rod 10 and the dredging drill bit 9 to rotate, and further, the coal body at the collapse position 18 is cut again; until the PE repairing pipeline 7 is conveyed into the gas extraction borehole 1, the length of the PE repairing pipeline 7 entering the gas extraction borehole 1 is similar to that of the gas extraction borehole 1, and it is indicated that all the collapsed parts 18 of the gas extraction borehole 1 are repaired; at the moment, the connection between the isolation bag 19 and the tail bearing 20 can be disassembled, the connection between the drill rod clamping device 14 and the tail drill rod 12 is disassembled, and the drill rod entering the gas extraction drill hole 1, the dredging drill bit 9 and the dredging end drill rod 10 can be quickly withdrawn from the gas extraction drill hole 1; step S3 specifically includes the following steps:
s31: when the dredging drill bit 9 rotates to cut the coal body at the collapse position, the push-pull function of the drilling machine 21 is synchronously started, so that the dredging drill bit 9 can also move towards the direction of the hole bottom 16 of the gas extraction drill hole; after the dredging drill bit 9 drills for a certain distance, the drilling machine 21 is stopped immediately, the compressed air is closed, the connection between the PE repairing pipeline 7 and the T-shaped tee joint 8 is removed, then the PE repairing pipeline 7 is pushed to move towards the bottom 16 of the gas extraction drill hole, if the movement is blocked, the collapse part 18 coal body is not cut completely, the PE repairing pipeline 7 is connected with the T-shaped tee joint 8 at the moment, the drilling machine 21 is continuously started, the explosion-proof motor 27 is enabled to rotate to drive the dredging drill bit 9 to rotate, and meanwhile, the push-pull function of the drilling machine 21 is started, so that the dredging drill bit 9 can also move towards the bottom 16 of the gas extraction drill hole;
s32: continuously repeating S31 until the PE repairing pipeline 7 entering the gas extraction borehole 1 is close to the gas extraction borehole 1 in length when the PE repairing pipeline 7 is conveyed into the gas extraction borehole 1, which indicates that all the collapsed parts 18 of the gas extraction borehole 1 are repaired; at this time, the connection between the isolation bag 19 and the tail bearing 20 can be removed, the connection between the drill rod clamping device 14 and the tail drill rod 12 can be removed, and the drill rod entering the gas extraction drill hole 1, the dredging drill bit 9 and the dredging end drill rod 10 can be rapidly withdrawn from the gas extraction drill hole.
The interconnection guide pipeline 28 is placed and gradually conveyed to the position in the gas extraction drill hole 1 needing interconnection, then the sieve hole pipe 29 is connected with the connecting pipe 30 through threads, and the sieve hole pipe is conveyed to the position in the gas extraction drill hole 1 needing interconnection; connecting an interconnected drill bit 31 with an interconnected end drill rod 32, connecting a plurality of connecting drill rods 11 with the interconnected end drill rods 32 through universal joints 13, gradually sending the interconnected drill bit 31 to a position needing interconnection through the connection of the connecting drill rods 11 and the universal joints 13, wherein the interconnected drill bit 31 can drill along the direction of a certain inclination angle due to the fact that the front end of an interconnection guide pipeline 28 has the certain inclination angle, and the collapsed and repaired gas extraction drill hole 1 is interconnected with adjacent drill holes;
s41: placing and gradually conveying the interconnected guide pipeline 28 to a position needing to be interconnected in the gas extraction drill hole 1, wherein optionally, the front end of the interconnected guide pipeline 28 has a certain inclination angle, so that the interconnected drill bit 31 can enter a coal body along the direction of the inclination angle, and the gas extraction drill hole 1 which is subjected to collapse repair is interconnected with an adjacent drill hole; meanwhile, the interconnected guide pipeline 28 is connected with the cross joint 5 and the T-shaped tee joint 8, and the function of the interconnected guide pipeline is the same as that of the PE repairing pipeline 7 in collapse repairing operation;
s42: then, the interconnected drill bit 31 is connected with the interconnected end drill rod 32, the plurality of connecting drill rods 11 are connected with the interconnected end drill rod 32 through universal joints 13, meanwhile, the sieve hole pipe 29 is connected with the connecting pipe 30 through threads, and a plurality of sieve holes 38 are distributed on the sieve hole pipe 29; gradually sending the interconnected drill bit 31 to a position needing interconnection through the connection of the connecting drill rod 11 and the universal joint 13; optionally, 2 springs 33 are arranged in the connecting pipe 30 in the direction of 180 °, when the drill rod 32 at the interconnected end portion carrying the interconnected drill bit 31 is not combined with the connecting pipe 30, the 2 springs 33 are in a stretching state, and can constrain a near-quarter arc stopper on the movable stopper 34 in an arc groove formed in the inner wall of the connecting pipe 30, and the movable stopper 34 slides in the moving track 39; when the interconnected end drill rod 32 carrying the interconnected drill bit 31 is combined with the connecting pipe 30, the ball 36 arranged in the groove of the circumferential fixed stop 35 on the interconnected end drill rod 32 is contacted with the inclined plane on the movable stop block 34, so that the movable stop block 34 is pushed to move towards the hole depth direction, and the pull hook 37 is enabled to fix the movable stop block 34; meanwhile, in the rotary drilling process of the interconnected drill bit 31 and the interconnected end drill rod 32, the balls 36 are arranged in the grooves of the circumferential fixed stop 35 and can roll in the grooves, so that the rotary drilling of the interconnected drill bit 31 and the interconnected end drill rod 32 is continuously carried out.
S5: the interconnected guide pipeline 28 has the same function as the PE repairing pipeline 7 in the collapse repairing process, and the connecting method is also the same; during interconnection operation, a drilling machine is started, so that the explosion-proof motor 27 drives the tail drill rod 12, the connecting drill rod 11, the universal joint 13, the interconnection end drill rod 32 and the interconnection drill bit 31 to rotate, and then coal among the gas extraction drill holes 1 is cut and drilled; the cut coal dust is transported to a water and slag removing device arranged at the hole of the gas extraction drill hole 1 through the annular space of the sieve hole pipe 29 and the interconnecting guide pipeline 28, and gas released by the coal body in the drilling process of the interconnecting drill bit 31 enters a gas extraction pipeline at the upper end of the cross joint 5;
s6: the interconnected drill bit 31 is continuously drilled to drive the sieve tube 29 to enter the coal body, after the interconnected drill bit 31 is drilled to a preset position, the push-pull function of the drilling machine 21 is started to enable the drill rod to move towards the direction of the hole opening of the drilled hole, and then the sieve tube 29 is retained in the interconnected drilled hole; according to the actual situation of the on-site engineering, S4-S6 can be repeated, 2-3 interconnected drill holes are constructed, the collapsed and repaired gas extraction drill holes 1 and 1-2 adjacent gas extraction drill holes are interconnected through the interconnected drill holes, and a network of the gas extraction drill holes 1 is formed; after the construction of the interconnected drilling is finished, the interconnected drill bit 31, the drill rod and the interconnected guide pipeline 28 can be withdrawn, the connecting hose 3 is connected with the three-way pipe 4, the other two ends of the three-way pipe 4 are respectively connected with the gas extraction pipeline and the water and slag removal device, and then gas extraction is continuously carried out.
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 (5)
1. An integrated extraction method for collapse repair and interconnection of gas extraction drill holes is characterized by comprising the following steps: the method comprises the following steps:
s1: constructing a gas extraction drill hole in the coal seam, immediately plugging the drill hole after the construction is finished, and installing an extraction pipe; the connecting hose is connected with the extraction pipe, so that gas in the drill hole enters the gas extraction pipeline through the extraction pipe and the connecting hose; after the gas extraction is carried out for a certain time, if the gas concentration in a certain gas extraction drill hole is close to 0 and the gas concentration value of an adjacent drill hole is close to the gas concentration in the coal bed, judging that the gas extraction drill hole is collapsed; then removing the connection between the three-way pipe and the connecting hose, placing the borehole peeping instrument in the gas extraction borehole, and detecting and determining the position of collapse; then respectively connecting the four-way joint with a connecting hose, a water and slag removal device and a connecting flange, and putting the PE repairing pipeline into the gas extraction drill hole through one end of the T-shaped three-way joint and the other end of the four-way joint until the PE repairing pipeline reaches the position where collapse occurs; then, the dredging drill bit is connected with a dredging end drill rod, a connecting drill rod and a tail drill rod through a plurality of universal joints, and the tail drill rod is clamped through a drill rod clamping device on the drilling machine;
s2: connecting an isolation bag with one end of the T-shaped tee joint and an outer ring of a tail bearing, and connecting the other end of the T-shaped tee joint with compressed air; then, starting a drilling machine and pressing air to enable the explosion-proof motor to drive the tail drill rod, the connecting drill rod, the end part dredging drill rod and the dredging drill bit to rotate, and further cutting the collapsed coal body; the compressed air drives the coal scraps cut by the dredging drill bit to an annular space in the connecting hose and the PE repairing pipeline through flowing in the PE repairing pipeline until the coal scraps enter a water and slag removing device connected with the lower end of the cross joint under the action of gravity, and the gas flowing out in the drilling process of the dredging drill bit flows into the upper end of the cross joint through the annular space of the connecting hose and the PE repairing pipeline under the action of negative pressure of an extraction pipe network system and then enters a gas extraction pipeline;
s3: after the dredging drill bit drills for a certain distance, the drilling machine is immediately stopped, the compressed air is closed, the connection between the PE repairing pipeline and the T-shaped tee joint is removed, then the PE repairing pipeline is pushed to move towards the bottom of the gas extraction drill hole, if the movement is blocked, the fact that the coal body at the collapse position is not cut completely is indicated, and then the PE repairing pipeline is connected with the T-shaped tee joint; then, the drilling machine is started again, so that the explosion-proof motor drives the tail drill rod, the connecting drill rod, the end part dredging drill rod and the dredging drill bit to rotate, and further, the coal body at the collapse position is cut again; when the PE repairing pipeline is conveyed into the gas extraction drill hole, the length of the PE repairing pipeline entering the gas extraction drill hole is close to that of the gas extraction drill hole, and it is indicated that all the collapsed parts of the gas extraction drill hole are repaired; at the moment, the connection between the isolation bag and the tail bearing is removed, the connection between the drill rod clamping device and the tail drill rod is removed, and the drill rod, the dredging drill bit, the end part dredging drill rod and the PE repairing pipeline which enter the gas extraction drill hole are withdrawn from the gas extraction drill hole;
the interconnection guide pipeline is placed and gradually conveyed to a position, needing interconnection, in the gas extraction drill hole, then the sieve hole pipe is connected with the connecting pipe through threads, and the sieve hole pipe is conveyed to the position, needing interconnection, in the gas extraction drill hole; connecting an interconnected drill bit with an interconnected end drill rod, connecting a plurality of connecting drill rods with the interconnected end drill rods through universal joints, gradually sending the interconnected drill bit to a position needing to be interconnected through the connection of the connecting drill rods and the universal joints, wherein the interconnected drill bit can drill along the direction of a certain inclination angle due to the fact that the front end of an interconnected guide pipeline has the certain inclination angle, and the collapsed and repaired gas extraction drill hole is interconnected with the adjacent drill hole;
s5: the interconnected guide pipelines have the same function as the PE repairing pipelines in the collapse repairing, and the connecting method is also the same; during interconnection operation, a drilling machine is started, so that the explosion-proof motor drives the tail drill rod, the connecting drill rod, the universal joint, the interconnection end drill rod and the interconnection drill bit to rotate, and then coal bodies among gas extraction drill holes are cut and drilled; the cut coal scraps are transported to a water and slag removing device arranged at the hole of the gas extraction drill hole through an annular space of the sieve hole pipe and the interconnected guide pipeline, and gas released by the coal body in the drilling process of the interconnected drill bit enters a gas extraction pipeline at the upper end of the cross joint;
s6: the interconnected drill bit continuously drills, the sieve tube is driven to enter the coal body, after the interconnected drill bit drills to a preset position, the push-pull function of the drilling machine is started, the drill rod moves towards the direction of the orifice of the drilled hole, and then the sieve tube is retained in the interconnected drilled hole; according to the actual situation of the on-site engineering, repeating S4-S6, constructing 2-3 interconnected drill holes, and interconnecting the collapsed and repaired gas extraction drill holes and 1-2 adjacent gas extraction drill holes through the interconnected drill holes to form a network of the gas extraction drill holes; after the construction of the interconnected drilling is finished, the interconnected drill bit, the drill rod and the interconnected guide pipeline are withdrawn, the connecting hose is connected with the three-way pipe, the other two ends of the three-way pipe are respectively connected with the gas extraction pipeline and the water and slag removal device, and then gas extraction is continuously carried out.
2. The integrated gas extraction method for collapse repair and interconnection of the gas extraction drill hole according to claim 1, characterized in that: step S1 specifically includes the following steps:
s11: constructing gas extraction drill holes in a transportation gateway or a return air gateway of a coal mine underground recovery working face, and placing extraction pipes in the gas extraction drill holes after the construction is finished; plugging the gas extraction drill hole by adopting a high polymer material or other hole sealing materials, wherein the depth and the length of a hole sealing section from the wall of the roadway to the bottom direction of the drill hole are more than 20 m; after the gas extraction drill hole is plugged, immediately connecting the connecting hose with an extraction pipe, so that gas in the drill hole enters a gas extraction pipeline through the extraction pipe and the connecting hose; the gas extraction pipeline is finally connected with a gas extraction pump arranged on the ground, and negative pressure is provided by the gas extraction pump, so that gas flows in a pipe network formed by the extraction pipelines laid under the coal mine; arranging a sampling hole on the surface of the connecting hose or the surface of the extraction pipe exposed out of the gas extraction drill hole, wherein the sampling hole is used for providing a channel for collecting gas for a special instrument for measuring the concentration of the extracted gas in the drill hole;
s12: after the constructed gas extraction drill hole is merged into a pipe network formed by gas extraction pipelines under the coal mine, starting to perform extraction, and then detecting the concentration of gas flowing out of the drill hole through a sampling hole every day; when the gas concentration in a certain gas extraction drill hole approaches to 0 and the gas concentration value of an adjacent drill hole approaches to the concentration of the original gas in the coal bed, judging that collapse occurs in the gas extraction drill hole;
s13: removing the connection between the three-way pipe and the connecting hose, placing the borehole peeping instrument in the gas extraction borehole, detecting and determining the position where collapse occurs, and recording the distance between the position and the orifice of the gas extraction borehole; selecting a PE repair pipeline with the length slightly higher than the value according to the distance; the opening of the PE repairing pipeline is provided with a reducing section with a certain length; then, respectively connecting the four-way joint with a connecting hose, a water and slag removal device and a connecting flange, wherein the outer surfaces of the connecting flange and the PE repair pipeline are also padded with sealing rubber rings; putting the PE repairing pipeline into the gas extraction drill hole through one end of the T-shaped tee joint and the other end of the tee joint until the PE repairing pipeline reaches the position where collapse occurs; the other end of the T-shaped tee joint is connected with compressed air, and an isolation bag is required to be arranged at the inserted end of the PE repair pipeline; the isolation bag is tightly attached to the surface of the straight pipe of the T-shaped tee joint through iron wire rolling; the overall size of the isolation bag can adapt to the displacement generated when the PE repairing pipeline enters the gas extraction drill hole;
s14: connecting the dredging drill bit with a dredging end drill rod, a connecting drill rod and a tail drill rod through a plurality of universal joints, and clamping the tail drill rod through a drill rod clamping device on a drilling machine; the dredging drill bit is connected with the dredging end drill rod through threads; bearings are further arranged on the dredging end drill rod and the connecting drill rod, and the inner rings of the bearings are fixed on the outer walls of the dredging end drill rod and the connecting drill rod; the bearing has the effects that the inner ring of the bearing is driven to rotate by the rotary motion of the drill rod at the dredging end part and the connecting drill rod, and the ball in the bearing is contacted with the outer ring of the bearing.
3. The integrated gas extraction method for collapse repair and interconnection of the gas extraction drill hole according to claim 1, characterized in that: step S2 specifically includes the following steps:
s21: the outer ring of the tail bearing is provided with a groove, so that the isolation bag can be fixed and tightly rolled in the groove of the outer ring of the tail bearing through an iron wire; the inner ring of the tail bearing is fixed on the outer wall of the tail drill rod and rotates along with the tail drill rod in the rotating process of the tail drill rod; connecting an isolation bag with one end of the T-shaped tee joint and an outer ring of a tail bearing, and connecting the other end of the T-shaped tee joint with compressed air;
s22: starting a drilling machine and pressing air to enable the explosion-proof motor to drive the tail drill rod, the connecting drill rod, the end dredging drill rod and the dredging drill bit to rotate, and further cutting the collapsed coal body; the air pressure of the compressed air is 0.5-0.7 MPa, and the compressed air enters the PE restoration pipeline through the T-shaped tee joint and drives the coal dust cut by the dredging drill bit to an annular space in the connecting hose and the PE restoration pipeline; coal dust cut by the dredging drill bit is driven by the pressure difference between the dredging drill bit and the PE repairing pipeline to enter an annular space in the connecting hose and the PE repairing pipeline until the coal dust enters a water and slag removing device connected with the lower end of the four-way joint under the action of gravity;
s23: in the process of dredging the drill bit to drill, gas accumulated due to blockage behind the collapse position flows to the orifice direction of the gas extraction drill hole due to the change of the coal body sealing performance of the collapse position, and flows into the upper end of the cross joint through the annular space of the connecting hose and the PE repairing pipeline under the action of negative pressure of the extraction pipe network system and then enters the gas extraction pipeline.
4. The integrated gas extraction method for collapse repair and interconnection of the gas extraction drill hole according to claim 1, characterized in that: step S3 specifically includes the following steps:
s31: when the dredging drill bit rotates to cut the coal body at the collapse position, the push-pull function of the drilling machine is synchronously started, so that the dredging drill bit can also move towards the bottom of the gas extraction drill hole; after the dredging drill bit drills for a certain distance, the drilling machine is stopped immediately, the compressed air is closed, the connection between the PE repairing pipeline and the T-shaped tee joint is removed, then the PE repairing pipeline is pushed to move towards the bottom of the gas extraction drill hole, if the movement is blocked, the fact that the coal at the collapse position is not cut completely is indicated, the PE repairing pipeline is connected with the T-shaped tee joint, the drilling machine is continuously started, the explosion-proof motor rotates to drive the dredging drill bit to rotate, and meanwhile, the push-pull function of the drilling machine is started, so that the dredging drill bit can also move towards the bottom of the gas extraction drill hole;
s32: continuously repeating S31 until the PE repairing pipeline is conveyed into the gas extraction drill hole, wherein the length of the PE repairing pipeline entering the gas extraction drill hole is close to that of the gas extraction drill hole, and the fact that all the collapsed parts of the gas extraction drill hole are repaired is indicated; at the moment, the isolation bag is detached from the tail bearing, the drill rod clamping device is detached from the tail drill rod, and the drill rod entering the gas extraction drill hole, the dredging drill bit and the dredging end drill rod are withdrawn from the gas extraction drill hole.
5. The integrated gas extraction method for collapse repair and interconnection of the gas extraction drill hole according to claim 1, characterized in that: step S4 specifically includes the following steps:
s41: gradually conveying the interconnected guide pipelines to the positions, required to be interconnected, in the gas extraction drill holes, wherein the front ends of the interconnected guide pipelines have certain inclination angles, and the interconnected drill bits enter the coal body along the direction of the inclination angles, so that the gas extraction drill holes after collapse repair are interconnected with the adjacent drill holes; the interconnected guide pipeline is connected with the four-way joint and the T-shaped three-way joint;
s42: connecting an interconnected drill bit with an interconnected end drill rod, connecting a plurality of drill rods with the interconnected end drill rod through universal joints, and simultaneously connecting a sieve hole pipe with a connecting pipe through threads; gradually sending the interconnected drill bits to positions needing interconnection through connection of the drill rods and the universal joints; the connecting pipe is internally provided with 2 springs in the direction of 180 degrees, the drill rod at the end part of the interconnection carrying the interconnected drill bit is not combined with the connecting pipe, the 2 springs are in a stretching state, and the nearly quarter arc stop block on the movable limiting block is restrained in an arc groove formed in the inner wall of the connecting pipe; when an interconnected end drill rod carrying an interconnected drill bit is combined with the connecting pipe, balls arranged in a groove of a circumferential fixed stop block on the interconnected end drill rod are contacted with an inclined plane on the movable limiting block, and then the movable limiting block is pushed to move towards the hole depth direction, so that the movable limiting block is fixed by the draw hook; meanwhile, in the rotary drilling process of the interconnected drill bit and the interconnected end drill rod, the balls are arranged in the grooves of the circumferential fixed stop blocks and can roll in the grooves, so that the continuous rotary drilling of the interconnected drill bit and the interconnected end drill rod is ensured.
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| CN116771277A (en) * | 2023-06-08 | 2023-09-19 | 华能云南滇东能源有限责任公司 | Gas extraction directional drilling system and equipment |
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| CN116771277A (en) * | 2023-06-08 | 2023-09-19 | 华能云南滇东能源有限责任公司 | Gas extraction directional drilling system and equipment |
| CN116771277B (en) * | 2023-06-08 | 2024-02-23 | 华能云南滇东能源有限责任公司 | Gas extraction directional drilling system and equipment |
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| CN114233370B (en) | 2023-07-18 |
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