CN115405270B - Method for optimizing water injection parameters of bedding drill hole after mechanical reaming and permeability increasing - Google Patents
Method for optimizing water injection parameters of bedding drill hole after mechanical reaming and permeability increasing Download PDFInfo
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- CN115405270B CN115405270B CN202211154255.4A CN202211154255A CN115405270B CN 115405270 B CN115405270 B CN 115405270B CN 202211154255 A CN202211154255 A CN 202211154255A CN 115405270 B CN115405270 B CN 115405270B
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/20—Displacing by water
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21B7/04—Directional drilling
- E21B7/046—Directional drilling horizontal drilling
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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
- E21B7/28—Enlarging drilled holes, e.g. by counterboring
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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
- E21F5/00—Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires
- E21F5/02—Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires by wetting or spraying
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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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- 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
A mechanical reaming anti-reflection back bedding drilling water injection parameter optimization method comprises the steps of drilling a plurality of bedding extraction drilling holes along a roadway to a coal seam through a conventional drill bit; forming a plurality of hole spaces and crushing loosening rings by utilizing the internal impact of the reaming bit in the bedding extraction borehole; plugging the bedding extraction drilling holes, and connecting a gas extraction pipeline to extract gas; when the working face extraction is close to the bedding drilling, the probe of the aperture measuring instrument and the displacement sensor are pushed forward at a constant speed along the bedding extraction drilling so as to synchronously monitor the aperture of each reaming hole and the corresponding hole depth position in real time; when the reaming section is injected with water, the water injection pressure and the water injection time are improved, and the normal water injection pressure and the normal water injection time are recovered when the conventional reaming section is injected with water. The method fully utilizes the development characteristics of the fracture in the mining stress relief area of the coal face, and through secondary pressure relief of the mechanical cave-making drilling of the coal seam in a long distance, the communication between the fractures around the drilling and the fracture in the mining stress relief area is promoted, and the water injection radius is improved.
Description
Technical Field
The invention belongs to the technical field of coal seam water injection in a coal mine, and particularly relates to a method for optimizing water injection parameters of a bedding drilling after mechanical reaming and permeability increasing.
Background
The dust yield of the coal face is large, and in order to achieve the effect of dust fall, a spray mode is generally adopted on the face to achieve the purpose of dust fall. However, this method is a method of treating generated dust, and therefore, when the amount of generated dust is large, a good dust-reducing effect cannot be obtained. In order to solve the problem of limited effect of this way, an active dust-proof method has emerged. The coal seam water injection is an ideal active dust prevention method, but the existing coal seam water injection method has the problems of large water consumption and limited water injection radius, so that the water injection effect is not ideal, and meanwhile, the waste of water resources is also caused. In addition, coal seam water injection is also an effective outburst elimination measure for coal and gas. The water is injected into the coal seam, so that the coal seam can be softened, the strength of the coal body is reduced, and the gas in the coal seam can be sealed, so that the emission of the gas is reduced. However, the existing coal seam water injection mode is unreasonable, the water injection radius is limited, the outburst elimination effect is not ideal, and meanwhile, the problem of water resource waste is also generated. Therefore, there is a need to develop a method capable of effectively increasing the radius of coal seam water injection and saving water consumption so as to effectively improve the dust-proof effect and the outburst-eliminating effect.
Disclosure of Invention
Aiming at some problems existing in the prior art, the invention provides a method for optimizing water injection parameters of a bedding drill hole after mechanical reaming and permeability increasing, which has the advantages of simple process, low implementation cost, effective improvement of dustproof and outburst elimination effects, remarkable water consumption saving, wide application range and good popularization value.
In order to achieve the above purpose, the invention provides a method for optimizing water injection parameters of a bedding borehole after mechanical reaming and permeability increasing, which comprises the following steps:
step one: preparing for bedding drilling operation;
connecting a drill bit I on a drill rod, wherein the drill bit I is a conventional drill bit; planning drilling positions of a plurality of bedding extraction drilling holes on the section of the coal seam to be operated, and ensuring that the interval between adjacent bedding extraction drilling holes is 5-10 m;
step two: drilling a bedding extraction drilling hole;
driving a drill bit I to drill a plurality of horizontal bedding extraction drill holes from the roadway wall to the coal seam by using a drilling machine, stopping drilling and exiting the drilling tool after the drill bit I drills a designated distance horizontally in the drilling process;
step three: preparing reaming operation;
removing and replacing the drill bit I with a drill bit II, wherein the drill bit II is a reaming bit;
step four: reaming and hole making operations are carried out in the selected bedding extraction drilling holes;
s1: firstly, a drill bit II is sent into the deepest part of the bedding extraction drilling hole by a drilling machine, then the drill bit II is driven to rotate at a high speed in a mode of increasing the rotating speed of the drilling machine, and a reaming cutter screwed out of a main drill bit is used for reaming and hole making operation at the tail end of the bedding extraction drilling hole, so that a coal body is damaged by impact to form an approximately elliptic irregular reaming hole space and a broken loose ring, and a plurality of cracks are formed between the reaming hole space and the broken loose ring;
s2: the drill bit II is retreated 5-10 m from the previous operation position, then hole reaming and hole making operation is carried out on the next position again, and the operation is repeated until a plurality of irregular hole reaming hole spaces and broken loose rings are formed at intervals along the horizontal direction in the whole bedding extraction drilling hole, and in the rotating process of the drill bit II, broken coal bodies are discharged out of the bedding extraction drilling hole by using a spiral blade on the outer wall of a drill rod;
step five: hole reaming and hole making operations are sequentially carried out in the other bedding extraction drilling holes;
repeating the second step in the rest sequential extraction drilling holes in sequence until the reaming and hole making operation of the last sequential extraction drilling hole is completed, and then withdrawing the drill bit II from the last sequential extraction drilling hole;
step six: carrying out gas extraction operation on all bedding extraction holes; the method comprises the steps of carrying out a first treatment on the surface of the
Firstly, plugging the bedding extraction drilling holes subjected to reaming and permeability increasing by using an orifice sealing device in sequence, and then connecting a gas extraction pipeline to the bedding extraction drilling holes to perform gas extraction operation;
step seven: measuring hole parameters of hole reaming holes in all bedding extraction holes;
when the extraction drilling hole is 20-30 m close to the coal face, firstly removing the gas extraction pipeline, then pushing the pore diameter measuring instrument probe and the displacement sensor forwards along the bedding extraction drilling hole at a constant speed through the telescopic drill rod, stopping pushing operation until the deepest part of the bedding extraction drilling hole is reached, and then pulling the drill rod back to enable the drill rod to exit the bedding extraction drilling hole; in the process, the aperture of each reaming hole and the corresponding hole depth position are synchronously monitored in real time by using an aperture measuring instrument probe and a displacement sensor, the monitored signals are transmitted to an external processor in real time, and the processor obtains the hole parameters of each reaming hole according to the received signals, wherein the hole parameters are aperture and corresponding hole depth position data;
step eight: optimizing coal seam water injection parameters, and injecting pressure water into the selected bedding extraction drilling holes;
firstly, the high-pressure water injector is sent into the sequential layer extraction drilling hole through the sealing drill rod, then the sealing drill rod is utilized to drive the high-pressure water injector to rotate and advance, and pressure water flows with different pressures and different times are synchronously injected into a reaming section and a conventional drilling section in the sequential layer extraction drilling hole according to the obtained hole parameters until the high-pressure water injector moves to the deepest part of the sequential layer extraction drilling hole, the pushing and water injection operation is stopped, and then the sealing drill rod is pulled back to enable the high-pressure water injector to exit the sequential layer extraction drilling hole; in this process, when the high-pressure water injector moves to the reaming section, the water injection pressure and the water injection time are increased by adjusting the water supply pump 5, and when the high-pressure water injector moves out of the reaming section and enters the conventional drilling section, the normal water injection pressure and the normal water injection time are restored.
Step nine: injecting pressure water into the rest bedding extraction drilling holes in sequence;
and (3) repeatedly executing the step eight in the rest sequential extraction drilling holes in sequence until the water injection process of all reaming holes is completed.
Further, in order to enhance the impact damage effect on the coal seam, so as to form larger-sized and irregular hole reaming spaces and broken loose rings, in S1 and S2 of the fourth step, the drilling speed of the drilling machine is 150-200 r/min during the reaming operation.
In order to ensure that the coal seam in the working range can be fully injected so as to improve the water injection effect of the coal seam to the greatest extent, in the fifth step, the reaming holes in the plurality of adjacent bedding extraction drilling holes are distributed in a fork shape.
Further, in order to effectively save water consumption while obviously improving the effective radius of the coal seam water injection, the water injection pressure P of the reaming section is equal to that of the reaming section in the eighth step and the ninth step 1 And conventional borehole section water injection pressure P 2 Satisfy formula (1), the water injection time t of the reaming section 1 And the water injection pressure t of the conventional drilling section 2 Satisfy formula (2);
in the method, in the process of the invention,
the maximum section radius of the nth row of reaming sections is expressed, and the unit is m; r is (r) 2 The average value of the section radius of a conventional drilling section is expressed in m; a represents a radius correction coefficient; r is (r) mmax The maximum section radius of the reaming section in the m-th row is expressed in m; b represents a radius correction factor, wherein the water filling time is realized by controlling the moving speed of the high-pressure water injector.
According to the invention, a plurality of horizontal bedding extraction drilling holes are drilled in a coal seam by utilizing a conventional drill bit, and then a plurality of irregular hole reaming hole spaces and broken loose rings are drilled at intervals in the hole reaming sections of the bedding extraction drilling holes by utilizing a hole reaming drill bit, so that a fracture network with higher complexity can be formed around the hole reaming sections of the bedding extraction drilling holes; because the interval between adjacent bedding extraction holes is 5-10 m, and the interval between adjacent reaming and hole-making is 5-10 m, the formed fracture network can be utilized to effectively communicate the areas between the adjacent bedding extraction holes, so that more sufficient release of gas in the section of the coal seam to be operated can be facilitated, and meanwhile, a passage with a larger range can be provided for subsequent water injection operation. On the basis of forming a fracture network, after the orifice is plugged and connected with the gas extraction pipeline, the gas in the coal seam to be operated can be extracted more efficiently and thoroughly, and then the problem of gas protrusion can be effectively eliminated. The drill rod which advances at a constant speed is utilized to carry the aperture measuring instrument probe and the displacement sensor to monitor the inside of the bedding extraction drilling hole in real time, so that the aperture data and the corresponding hole depth position data of each reaming hole in the bedding extraction drilling hole can be conveniently obtained, and the coal seam water injection parameters can be conveniently optimized according to the hole parameters. On one hand, the water injection into the coal bed can soften the coal bed, reduce the intensity of the coal body, reduce the emission of gas, further improve the effect of eliminating outburst, on the other hand, the dust prevention effect can be improved to the maximum extent from the root source generated by coal dust. When entering the reaming section, the water injection pressure and the water injection time are improved, so that the pressure water flow can more fully enter the fracture network, the water injection effect can be effectively improved, and the effective radius of the coal seam water injection can be remarkably improved. When entering the conventional drilling section, the water injection pressure and the water injection time are reduced, so that the water injection requirement of the conventional drilling section can be met, and the water injection quantity can be effectively saved. Therefore, pressure water flow is injected into the reaming section and the conventional drilling section in the coal seam in a mode of optimizing water injection parameters, so that the water injection effect on the coal seam can be ensured, the water consumption can be effectively saved, a large amount of waste of water resources is avoided, and the purpose of energy conservation is achieved. The method fully utilizes the development characteristics of the fracture in the mining stress relief area of the coal face, and through secondary pressure relief of the mechanical cave-making drilling of the coal seam in a long distance, the communication between the fractures around the drilling and the fracture in the mining stress relief area is promoted, the water injection radius is improved, the concrete implementation steps are simple, the implementation cost is low, the purposes of dust prevention, outburst elimination and energy saving can be achieved at the same time, the economic benefit is good, and the large-area popularization and application are facilitated.
Drawings
FIG. 1 is a schematic diagram of a reaming and cavitation process in accordance with the present invention;
FIG. 2 is a schematic view of the coal seam area of the present invention after a bedding extraction drilling and reaming operation;
FIG. 3 is a schematic cross-sectional view of a reamer cavity arrangement of a plurality of adjacent bedding extraction boreholes in accordance with the present invention;
FIG. 4 is a schematic diagram of a coal seam injection process in accordance with the present invention.
In the figure: 1. coal bed, 2, sequential layer extraction drilling holes, 3, reaming holes, 4, cracks, 5, a water supply pump, 6, pressure water flow, 7 and broken loose rings.
Detailed Description
The present invention will be further described below.
As shown in fig. 1 to 4, the invention provides a method for optimizing water injection parameters of a bedding borehole after mechanical reaming and permeability improvement, which comprises the following steps:
step one: preparing for bedding drilling operation;
connecting a drill bit I on a drill rod, wherein the drill bit I is a conventional drill bit; planning drilling positions of a plurality of bedding extraction drilling holes 2 on the section of the coal seam 1 to be operated, and ensuring that the distance between adjacent bedding extraction drilling holes 2 is 5-10 m;
step two: drilling a bedding extraction drilling hole 2;
a drill bit I is driven by a drilling machine to drill a plurality of horizontal bedding extraction drilling holes 2 from the roadway wall to the coal seam 1, and in the drilling process, after the drill bit I drills a designated distance horizontally, the drilling is stopped and the drilling tool is withdrawn;
step three: preparing reaming operation;
removing and replacing the drill bit I with a drill bit II, wherein the drill bit II is a reaming bit;
step four: performing reaming and hole making operation in the selected bedding extraction drilling hole 2;
s1: firstly, a drill bit II is sent into the deepest part of the bedding extraction drilling hole 2 by a drilling machine, then the drill bit II is driven to rotate at a high speed in a mode of increasing the rotating speed of the drilling machine, and reaming and hole making operation is carried out at the tail end of the bedding extraction drilling hole 2 by using a reaming cutter screwed out of a main drill bit, so that coal bodies are damaged by impact to form an approximately elliptic irregular reaming hole 3 space and a broken loose ring 7, and a plurality of cracks 4 are formed between the reaming hole 3 space and the broken loose ring 7;
s2: the drill bit II is retreated 5-10 m from the previous operation position, then hole reaming and hole making operation is carried out on the next position again, and the operation is repeated until a plurality of irregular hole reaming hole 3 spaces and broken loose rings 7 are formed in the whole bedding extraction drilling hole 2 at intervals along the horizontal direction, and broken coal bodies are discharged out of the bedding extraction drilling hole 2 by using a spiral blade on the outer wall of a drill rod in the rotation process of the drill bit II;
step five: hole reaming and hole making operations are sequentially carried out in the other bedding extraction drilling holes 2;
repeating the second step in the rest sequential extraction drilling holes 2 in sequence until the reaming and hole making operation of the last sequential extraction drilling hole 2 is completed, and then withdrawing the drill bit II from the last sequential extraction drilling hole 2;
step six: carrying out gas extraction operation on all bedding extraction drilling holes 2;
firstly, plugging the bedding extraction drilling holes 2 subjected to reaming and permeability increasing by using an orifice sealing device in sequence, and then connecting a gas extraction pipeline on the bedding extraction drilling holes 2 to perform gas extraction operation;
step seven: measuring hole parameters of the hole enlarging holes 3 in all the bedding extraction holes 2;
when the extraction drilling hole is close to the coal face by 20-30 m, a stress relief area is formed in the face, and the fracture of the relief area is communicated with the bedding drilling hole so as to facilitate seepage of water injection bodies. Firstly removing a gas extraction pipeline, then pushing the probe of the aperture measuring instrument and the displacement sensor forwards at a constant speed along the bedding extraction drilling hole 2 through a telescopic drill rod, stopping pushing operation until the deepest part of the bedding extraction drilling hole 2 is reached, and then pulling the drill rod back to enable the drill rod to exit the bedding extraction drilling hole 2; in the process, the aperture of each reaming hole 3 and the corresponding hole depth position are synchronously monitored in real time by using an aperture measuring instrument probe and a displacement sensor, the monitored signals are transmitted to an external processor in real time, and the processor obtains the hole parameters of each reaming hole 3 according to the received signals, wherein the hole parameters are aperture and corresponding hole depth position data;
step eight: optimizing coal seam water injection parameters, and injecting pressure water into the selected bedding extraction drilling holes 2;
firstly, a high-pressure water injector is sent into a bedding extraction drilling hole 2 through a sealing drill rod, then the sealing drill rod is used for driving the high-pressure water injector to rotate and advance, and pressure water flows 6 with different pressures and different times are synchronously injected into a reaming section and a conventional drilling section in the bedding extraction drilling hole 2 according to the obtained hole parameters until the high-pressure water injector moves to the deepest part of the bedding extraction drilling hole 2, and then the sealing drill rod is pulled back to enable the high-pressure water injector to exit the bedding extraction drilling hole 2; in this process, when the high-pressure water injector moves to the reaming section, the water injection pressure and the water injection time are increased by adjusting the water supply pump 5, and when the high-pressure water injector moves out of the reaming section and enters the conventional drilling section, the normal water injection pressure and the normal water injection time are restored.
Step nine: injecting the pressure water into the rest bedding extraction drilling holes 2 in sequence;
and (3) repeatedly executing the step eight in the rest of the bedding extraction drilling holes 2 in sequence until the water injection process of all the reaming holes 3 is completed.
In order to improve impact damage effect on the coal bed, larger-sized and irregular hole reaming space and broken loose rings are formed, and in S1 and S2 of the fourth step, the drilling speed of the drilling machine during reaming operation is 150-200 r/min.
In order to ensure that the coal seam in the working range can be fully injected so as to furthest improve the water injection effect of the coal seam, in the fifth step, the reaming holes 3 in the plurality of adjacent bedding extraction drilling holes 2 are distributed in a fork type.
In order to effectively save water consumption while obviously improving the effective radius of coal seam water injection, the water injection pressure P of the reaming section is equal to that of the reaming section in the eighth step and the ninth step 1 And conventional borehole section water injection pressure P 2 Satisfy formula (1), the water injection time t of the reaming section 1 And the water injection pressure t of the conventional drilling section 2 Satisfy formula (2);
in the method, in the process of the invention,
the maximum section radius of the nth row of reaming sections is expressed, and the unit is m; r is (r) 2 The average value of the section radius of a conventional drilling section is expressed in m;a represents a radius correction coefficient; r is (r) mmax The maximum section radius of the reaming section in the m-th row is expressed in m; b represents a radius correction factor, wherein the water filling time is realized by controlling the moving speed of the high-pressure water injector.
According to the invention, a plurality of horizontal bedding extraction drilling holes are drilled in a coal seam by utilizing a conventional drill bit, and then a plurality of irregular hole reaming hole spaces and broken loose rings are drilled at intervals in the hole reaming sections of the bedding extraction drilling holes by utilizing a hole reaming drill bit, so that a fracture network with higher complexity can be formed around the hole reaming sections of the bedding extraction drilling holes; because the interval between adjacent bedding extraction holes is 5-10 m, and the interval between adjacent reaming and hole-making is 5-10 m, the formed fracture network can be utilized to effectively communicate the areas between the adjacent bedding extraction holes, so that more sufficient release of gas in the section of the coal seam to be operated can be facilitated, and meanwhile, a passage with a larger range can be provided for subsequent water injection operation. On the basis of forming a fracture network, after the orifice is plugged and connected with the gas extraction pipeline, the gas in the coal seam to be operated can be extracted more efficiently and thoroughly, and then the problem of gas protrusion can be effectively eliminated. The drill rod which advances at a constant speed is utilized to carry the aperture measuring instrument probe and the displacement sensor to monitor the inside of the bedding extraction drilling hole in real time, so that the aperture data and the corresponding hole depth position data of each reaming hole in the bedding extraction drilling hole can be conveniently obtained, and the coal seam water injection parameters can be conveniently optimized according to the hole parameters. On one hand, the water injection into the coal bed can soften the coal bed, reduce the intensity of the coal body, reduce the emission of gas, further improve the effect of eliminating outburst, on the other hand, the dust prevention effect can be improved to the maximum extent from the root source generated by coal dust. When entering the reaming section, the water injection pressure and the water injection time are improved, so that the pressure water flow can more fully enter the fracture network, the water injection effect can be effectively improved, and the effective radius of the coal seam water injection can be remarkably improved. When entering the conventional drilling section, the water injection pressure and the water injection time are reduced, so that the water injection requirement of the conventional drilling section can be met, and the water injection quantity can be effectively saved. Therefore, pressure water flow is injected into the reaming section and the conventional drilling section in the coal seam in a mode of optimizing water injection parameters, so that the water injection effect on the coal seam can be ensured, the water consumption can be effectively saved, a large amount of waste of water resources is avoided, and the purpose of energy conservation is achieved. The method fully utilizes the development characteristics of the fracture in the mining stress relief area of the coal face, and through secondary pressure relief of the mechanical cave-making drilling of the coal seam in a long distance, the communication between the fractures around the drilling and the fracture in the mining stress relief area is promoted, the water injection radius is improved, the concrete implementation steps are simple, the implementation cost is low, the purposes of dust prevention, outburst elimination and energy saving can be achieved at the same time, the economic benefit is good, and the large-area popularization and application are facilitated.
Claims (4)
1. The method for optimizing the water injection parameters of the bedding drill hole after mechanical reaming and permeability increasing is characterized by comprising the following steps of:
step one: preparing for bedding drilling operation;
connecting a drill bit I on a drill rod, wherein the drill bit I is a conventional drill bit; planning drilling positions of a plurality of bedding extraction drilling holes (2) on the section of a coal seam (1) to be operated, and ensuring that the distance between adjacent bedding extraction drilling holes (2) is 5-10 m;
step two: drilling a bedding extraction drilling hole (2);
driving a drill bit I to drill a plurality of horizontal bedding extraction drilling holes (2) from the roadway wall to the coal seam (1) by using a drilling machine, and stopping drilling and exiting the drilling tool after the drill bit I drills a designated distance horizontally in the drilling process;
step three: preparing reaming operation;
removing and replacing the drill bit I with a drill bit II, wherein the drill bit II is a reaming bit;
step four: reaming and hole making operations are carried out in the selected bedding extraction drilling holes (2);
s1: firstly, a drill bit II is conveyed into the deepest part of the bedding extraction drilling hole (2) by a drilling machine, then the drill bit II is driven to rotate at a high speed in a mode of increasing the rotating speed of the drilling machine, and reaming and hole making operation is carried out at the tail end of the bedding extraction drilling hole (2) by using a reaming cutter screwed out of a main drill bit, so that coal bodies are damaged by impact to form an approximately elliptic irregular reaming hole (3) space and a broken loose ring (7), and a plurality of cracks (4) are formed between the reaming hole (3) space and the broken loose ring (7);
s2: the drill bit II is retreated 5-10 m from the previous operation position, then reaming and hole making operation is carried out on the next position again, and the operation is repeated until a plurality of irregular reaming hole (3) spaces and broken loose rings (7) are formed in the whole bedding extraction drilling hole (2) at intervals along the horizontal direction, and broken coal bodies are discharged out of the bedding extraction drilling hole (2) by using a spiral blade on the outer wall of a drill rod in the rotation process of the drill bit II;
step five: hole reaming and hole making operations are sequentially carried out in the other bedding extraction drilling holes (2);
sequentially repeating the second step in the rest sequential extraction drilling holes (2) until the reaming and hole-making operation of the last sequential extraction drilling hole (2) is completed, and then withdrawing the drill bit II from the last sequential extraction drilling hole (2);
step six: carrying out gas extraction operation on all bedding extraction holes (2);
firstly, plugging the bedding extraction drilling holes (2) subjected to reaming and permeability increasing by using an orifice sealing device in sequence, and then connecting a gas extraction pipeline on the bedding extraction drilling holes (2) to perform gas extraction operation;
step seven: measuring hole parameters of the hole enlarging holes (3) in all the bedding extraction holes (2);
when the extraction drilling hole is close to the coal face by 20-30 m, firstly removing the gas extraction pipeline, then pushing the pore diameter measuring instrument probe and the displacement sensor forwards along the bedding extraction drilling hole (2) at a constant speed through the telescopic drill rod, stopping pushing operation until the deepest part of the bedding extraction drilling hole (2) is reached, and then pulling the drill rod back to enable the drill rod to exit the bedding extraction drilling hole (2); in the process, the aperture of each reaming hole (3) and the corresponding hole depth position are synchronously monitored in real time by using an aperture measuring instrument probe and a displacement sensor, the monitored signals are transmitted to an external processor in real time, and the processor obtains the hole parameters of each reaming hole (3) according to the received signals, wherein the hole parameters are aperture and corresponding hole depth position data;
step eight: optimizing coal seam water injection parameters, and injecting pressure water into the selected bedding extraction drilling holes (2);
firstly, a high-pressure water injector is sent to the inside of a bedding extraction drilling hole (2) through a sealing drill rod, then the sealing drill rod is used for driving the high-pressure water injector to rotate and advance, and pressure water flows (6) with different pressures and different times are synchronously injected into a reaming section and a conventional drilling section in the bedding extraction drilling hole (2) according to the obtained hole parameters until the high-pressure water injector moves to the deepest part of the bedding extraction drilling hole (2), and then the sealing drill rod is pulled back to enable the high-pressure water injector to exit the bedding extraction drilling hole (2); in the process, when the high-pressure water injector moves to the reaming section, the water injection pressure and the water injection time are improved by adjusting the water supply pump (5), and when the high-pressure water injector moves out of the reaming section and enters the conventional drilling section, the normal water injection pressure and the normal water injection time are recovered;
step nine: injecting the pressure water into the rest bedding extraction drilling holes (2) in sequence;
and (3) repeatedly executing the step eight in the rest sequential extraction drilling holes (2) in sequence until the water injection process of all the reaming holes (3) is completed.
2. The method for optimizing water injection parameters of mechanical reaming and permeability-increasing bedding drill hole according to claim 1, wherein in the step S1 and the step S2, the drilling speed of the drilling machine during reaming operation is 150-200 r/min.
3. The method for optimizing water injection parameters of mechanical reaming and permeability-increasing bedding drill holes according to claim 1 or 2, wherein in the fifth step, reaming holes (3) in a plurality of adjacent bedding extraction drill holes (2) are distributed in a fork type.
4. A method for optimizing water injection parameters of a mechanical reaming and permeability enhancing bedding borehole as claimed in claim 3, wherein in step eight and step nine, the water injection pressure P of the reaming section 1 And conventional borehole section water injection pressure P 2 Satisfy formula (1), the water injection time t of the reaming section 1 And the water injection pressure t of the conventional drilling section 2 Satisfy formula (2);
in the method, in the process of the invention,
the maximum section radius of the nth row of reaming sections is expressed, and the unit is m; r is (r) 2 The average value of the section radius of a conventional drilling section is expressed in m; a represents a radius correction coefficient; r is (r) mmax The maximum section radius of the reaming section in the m-th row is expressed in m; b represents a radius correction factor, wherein the water filling time is realized by controlling the moving speed of the high-pressure water injector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211154255.4A CN115405270B (en) | 2022-09-22 | 2022-09-22 | Method for optimizing water injection parameters of bedding drill hole after mechanical reaming and permeability increasing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211154255.4A CN115405270B (en) | 2022-09-22 | 2022-09-22 | Method for optimizing water injection parameters of bedding drill hole after mechanical reaming and permeability increasing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115405270A CN115405270A (en) | 2022-11-29 |
| CN115405270B true CN115405270B (en) | 2023-06-30 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110145233A (en) * | 2019-04-03 | 2019-08-20 | 山东唐口煤业有限公司 | A kind of disaster-ridden evil collaboration control method of rock burst coal seam " boring-cutting-presses-pumping-to infuse " |
| WO2019200598A1 (en) * | 2018-04-20 | 2019-10-24 | 大连理工大学 | Multi-section staged pressure-reduction water injection apparatus based on fracture observation and observation method thereof |
| CN110630181A (en) * | 2019-08-27 | 2019-12-31 | 中国矿业大学 | Coal seam reaming and permeability increasing method utilizing pneumatic coupling effect |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2019200598A1 (en) * | 2018-04-20 | 2019-10-24 | 大连理工大学 | Multi-section staged pressure-reduction water injection apparatus based on fracture observation and observation method thereof |
| CN110145233A (en) * | 2019-04-03 | 2019-08-20 | 山东唐口煤业有限公司 | A kind of disaster-ridden evil collaboration control method of rock burst coal seam " boring-cutting-presses-pumping-to infuse " |
| CN110630181A (en) * | 2019-08-27 | 2019-12-31 | 中国矿业大学 | Coal seam reaming and permeability increasing method utilizing pneumatic coupling effect |
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| 定向长钻孔水力压裂在松软煤层中的应用研究;刘海金;;江西煤炭科技(第03期);23-26 * |
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