CN115559685B - Device and method for preparing and sealing coal-based composite hole sealing material in real time in drilling process - Google Patents
Device and method for preparing and sealing coal-based composite hole sealing material in real time in drilling process Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 118
- 239000002131 composite material Substances 0.000 title claims abstract description 55
- 239000003566 sealing material Substances 0.000 title claims abstract description 45
- 238000005553 drilling Methods 0.000 title claims abstract description 43
- 238000007789 sealing Methods 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 31
- 230000008569 process Effects 0.000 title claims abstract description 20
- 238000000605 extraction Methods 0.000 claims abstract description 32
- 239000002817 coal dust Substances 0.000 claims description 161
- 239000002245 particle Substances 0.000 claims description 123
- 239000002002 slurry Substances 0.000 claims description 114
- 238000012216 screening Methods 0.000 claims description 34
- 239000000463 material Substances 0.000 claims description 24
- 239000004568 cement Substances 0.000 claims description 17
- 238000001914 filtration Methods 0.000 claims description 17
- 238000002360 preparation method Methods 0.000 claims description 17
- 238000005086 pumping Methods 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 238000000926 separation method Methods 0.000 claims description 11
- 238000002347 injection Methods 0.000 claims description 10
- 239000007924 injection Substances 0.000 claims description 10
- 238000005422 blasting Methods 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 6
- 239000000839 emulsion Substances 0.000 claims description 3
- 238000011161 development Methods 0.000 abstract description 4
- 239000004816 latex Substances 0.000 description 10
- 229920000126 latex Polymers 0.000 description 10
- 239000011148 porous material Substances 0.000 description 6
- 239000013078 crystal Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000000945 filler Substances 0.000 description 4
- 230000036571 hydration Effects 0.000 description 4
- 238000006703 hydration reaction Methods 0.000 description 4
- 238000005056 compaction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011847 coal-based material Substances 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 231100000086 high toxicity Toxicity 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
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- 238000003756 stirring Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
- E21B33/138—Plastering the borehole wall; Injecting into the formation
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/005—Monitoring or checking of cementation quality or level
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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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Mining & Mineral Resources (AREA)
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- Fluid Mechanics (AREA)
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Abstract
The invention belongs to the technical field of development and equipment of coal mine underground gas extraction drilling hole sealing materials, and particularly relates to a device and a method for preparing and sealing coal-based composite hole sealing materials in real time in the drilling process.
Description
Technical Field
The invention belongs to the technical field of development and equipment of coal mine underground gas extraction drilling hole sealing materials, and particularly relates to a device and a method for preparing and sealing a coal-based composite hole sealing material in real time in a drilling process.
Background
As the coal mining depth is deepened, the pressure of coal seam gas is increased, and the risks of mine gas emission, coal (rock) and gas outburst and the like exist, so that the coal mine gas drainage is controlled in time, and the underground coal mine safety production is facilitated. The existing coal mine gas control technology mainly comprises the technologies of gas extraction, coal seam water injection, hydraulic fracturing and the like, and the occurrence of gas emission, gas overrun and outburst accidents in coal seam exploitation can be effectively reduced by adopting the coal seam gas extraction technology. A large amount of coal dust is easy to generate in the coal seam drilling process, so that the environment pollution is caused, coal resources are wasted, and the secondary utilization of coal dust particles can realize the effects of saving resources and green exploitation. The traditional inorganic hole sealing material has the defects of water loss shrinkage, low early strength, poor impermeability and the like, and is difficult to fully seal the drilling hole; the organic hole sealing material has the advantages of low viscosity, strong cohesiveness and easiness in penetrating into fine cracks, but the material has the advantages of high toxicity, poor flame retardance and high cost, and is limited to the application of underground hole sealing of coal mines. The cement material is widely used at present, the material has low cost, wide material sources and simple construction process, coal scraps are used as waste in coal mine exploitation, and the coal scraps and other additives are utilized to develop a coal-based composite hole sealing material, so that the secondary utilization and zero emission of the waste are realized, the underground environmental pollution is reduced, the local material sources can be obtained, the cost investment is reduced, and the efficient comprehensive utilization of coal resources is promoted.
According to the invention, through development and utilization of the coal-based composite hole sealing material, the high-efficiency plugging of the drill cracks is realized by improving the bonding performance of the inorganic hole sealing material and the drill coal wall and controlling the coal dust doping materials with different particle diameters, and the consolidated body has a compact pore structure through the filling effect of coal dust particles.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a device and a method for preparing and sealing a coal-based composite hole sealing material in real time in a drilling process. Through the cooperation of the division work of each division system, the coal dust generation system is used for manufacturing coal dust particles, the coal dust separation system is used for screening coal dust particles with ideal particle sizes, the coal-based composite material preparation system is used for developing hole sealing material slurry and the coal-based composite material hole sealing system is used for plugging a drilled hole in real time, path references are provided for secondary utilization of the coal dust particles generated in the drilling process, a reasonable thought is provided for development of coal mine hole sealing materials, and a new use technical method is provided for the hole sealing system and technology, so that the drainage efficiency of coal seam gas is improved.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the device comprises a coal dust generation system, a coal dust separation system connected with an outlet of the coal dust generation system, a coal-based composite material preparation system connected with the coal dust separation system, and a coal-based composite material hole sealing system connected with the coal-based composite material preparation system.
Further, the coal dust generation system is provided by a drill rod positioned in a coal layer, the end part of the drill rod is provided with a drill bit, the circumference of the drill bit is provided with a coal suction hole, the drill bit is driven by a drilling machine system, the drilling machine system is controlled by a drilling machine control table, the outer wall of the drill rod is connected with the drill bit through a rotating assembly, the inner cavity of the drill rod is communicated with the coal suction hole, the drill rod consists of a plurality of sections, and adjacent drill rods are connected through connecting threads; the control platform of the drilling machine controls the start and stop of the drilling machine system, the connecting action of the connecting screw threads of the drill rod enables the outer wall of the drill rod to extend into a drilled hole, the drill bit is driven to rotationally cut a coal bed through the rotating component of the drilling machine system, and generated coal dust particles flow to the inner cavity of the drill rod from the drill bit openings, so that the main function is to capture coal dust generated in the drilling process of the coal bed.
Further, the coal dust separating system comprises a negative pressure extraction pipe, the left end of the negative pressure extraction pipe is fixedly connected with the outer wall of the drill rod through a sleeve straight-through valve, the right end of the negative pressure extraction pipe stretches into the negative pressure system, a vertical parallel coal dust particle size screening baffle 1#, a coal dust particle size screening baffle 2# are sequentially arranged in the negative pressure system, a baffle is further arranged at the bottom of the negative pressure system, a coal dust discharge port 1# and a coal dust discharge port 2# are arranged on the baffle, the coal dust particle size screening baffle is fixedly connected with the baffle through a clamping groove on the baffle, the coal dust discharge port 1# is positioned at the bottom of the left end of the coal dust particle size screening baffle 1#, the coal dust discharge port 2# is positioned at the bottom of the left end of the coal dust particle size screening baffle 2#, a negative pressure motor and an exhaust port are further arranged on the negative pressure system, a residue outlet is arranged on the baffle opposite to the exhaust port, and a coal dust conveying belt is arranged at the bottom of the baffle, the negative pressure extraction pipe is provided with four pipe holes, a negative pressure meter and a flowmeter are arranged on the negative pressure extraction pipe, a gauze filter screen is arranged on the exhaust port, the outer wall of a drill rod is connected with the negative pressure extraction pipe by a sleeve straight-through valve, the negative pressure extraction pipe is provided with four pipe holes, the negative pressure meter and the flowmeter are arranged for measuring comprehensive technical parameters, the negative pressure motor is used for driving the negative pressure system to extract coal dust particles manufactured by the coal dust generating system, a screen with uniform pore size (pore size 3mm and pore size 1 mm) screening baffle (coal dust particle size screening baffle 1#, coal dust particle size screening baffle 2#) is replaced at the baffle clamping groove for filtering the coal dust particles, the gauze filter screen is used for filtering coal dust-gas, the screened coal dust particles with particle size larger than 3mm are filtered from the coal dust discharge port 1#, the coal dust particles with particle size 1-3 mm are filtered from the coal dust discharge port 2#, the residual material outlet is filtered with the coal dust particles with particle size smaller than 1mm, and the gas is discharged from the gas outlet, and the flowing coal dust particles are conveyed by the coal dust conveying belt.
Further, the preparation system of the coal-based composite material comprises a slurry generator, wherein a stirrer is arranged in the slurry generator, a material/water inlet is formed in the top of the slurry generator, a slurry outlet valve is arranged at the bottom of the slurry generator, the top of the slurry generator is connected with a coal dust conveying belt through a connecting pipeline, the coal dust conveying belt and a slurry generating device are connected through the connecting pipeline, and cement materials, emulsion powder and water are mixed according to the following ratio of 1:0.1:1.2, uniformly mixing the slurry by using an electric stirring device, and controlling the flow of the prepared slurry by a slurry outlet valve for use.
Further, the coal-based composite material hole sealing system comprises a grouting pipeline, the grouting pipeline is positioned in a drilling hole, the tail end of the grouting pipeline is provided with an expansion bag 1# and an expansion bag 2#, the position of the grouting pipeline, which is positioned on the expansion bag 1#, is provided with a slurry outlet 1#, the position of the grouting pipeline, which is positioned on the expansion bag 2#, is provided with a slurry outlet 2#, a crack is arranged on the grouting pipeline between the slurry outlet 1#, the slurry outlet 2#, a blasting valve is arranged on the crack, the coal-based composite material hole sealing system further comprises a slurry returning pipe, the slurry returning pipe passes through the expansion bag 1# and the rear end part of the slurry returning pipe is positioned between the expansion bag 1# and the expansion bag 2#, the coal-based composite material hole sealing system further comprises a pumping screen pipe, the rear end part of the pumping screen pipe extends out of the expansion bag 2# and is positioned at the bottom of the drilling hole on the right side, the front end of the grouting pipe is positioned outside the drilling hole, the front end of the grouting pipeline is connected with a slurry pumping pump, the slurry pump is connected with a slurry outlet valve at the bottom of the slurry generator through a pipeline, a slurry injection valve is arranged on the slurry injection pipeline, a slurry extraction sieve tube valve is arranged on the slurry extraction sieve tube, the bearing upper limit of the blasting valve is 0.5MPa, the slurry pump is connected with the slurry outlet pipe and the slurry injection pipe, firstly, coal-based hole sealing material slurry is injected into an expansion bag 1# and an expansion bag 2# through a slurry outlet 1# and a slurry outlet 2# respectively, when the slurry injection pressure reaches 0.5MPa, the blasting valve is opened, after the slurry is filled between the two bags, the slurry return port is in a slurry reverse phenomenon, the slurry is solidified, the slurry injection valve is opened, coal seam gas enters a sieve tube gas inlet, the coal-based hole sealing material slurry consists of cement particles, coal dust particles and latex, the latex can bond the cement particles and the coal seam, and the coal dust particles are filled between cement hydration product crystals as filling agents, the compaction degree of the material consolidation body is improved.
A hole sealing method for a coal-based composite hole sealing material real-time preparation and hole sealing device in a drilling process comprises the following steps:
s1, acquiring coal dust particles by using a coal dust generation system, controlling the start and stop of the drilling machine system by using a drilling machine control table, driving a drill bit to rotate by using a drill bit rotating device to cut a coal bed, and enabling the generated coal dust particles to flow to an inner cavity of a drill rod from a drill bit opening; simultaneously starting a negative pressure system, and sucking most of generated coal dust particles into a negative pressure extraction pipe by utilizing negative pressure generated by a negative pressure motor;
s2, screening coal dust particles by using a coal dust separation system, filtering out the coal dust particles with different particle sizes by a coal dust particle size screening baffle 1# with the aperture of 3mm and a coal dust particle size screening baffle 2# with the aperture of 1mm, filtering out the coal dust particles with the particle size of more than 3mm from a coal dust discharge port 1#, filtering out the coal dust particles with the particle size of 1-3 mm from a coal dust discharge port 2#, and filtering out the coal dust particles with the particle size of less than 1mm from a residue outlet;
s3, preparing coal-based composite hole sealing materials with different particle sizes by using a coal-based composite material preparation system, conveying the coal dust to a slurry generator through a material conveying belt, and mixing the coal dust, cement, emulsion powder and water according to the mass ratio of 0.1:1:0.1:1.2, preparing a coal-based composite hole sealing material;
s4, plugging a drilled hole by using a coal-based composite material hole sealing system, pumping coal-based composite hole sealing material slurry in a slurry generating device by using a slurry pump, injecting an expansion bag 1# in a hole sealing mode of 'two plugs and one injection', supporting a drilled coal bed by using the expansion bag 2# at first, opening a blasting valve when the grouting pressure reaches 0.5MPa, injecting the coal-based hole sealing material slurry into a plugging interval, opening a suction screen valve after the slurry is solidified, and pumping coal bed gas from a screen gas inlet.
The invention has the following beneficial effects: according to the hole sealing device and method, coal dust particles generated in the drilling process can be collected through negative pressure sampling, coal-based composite hole sealing materials with different particle sizes are prepared and used for the drilling plugging process, the consolidated body has a compact pore structure through the filling effect of the coal dust particles, and cement particle hydration product crystals and a coal seam are bonded through latex; according to the difference between the data related to the plugging and drilling effects of the coal-based composite hole sealing materials with different particle sizes in the field construction test, the method is favorable for further analyzing, optimizing and developing the coal-based materials, the consumption of aggregate and other costs of the hole sealing materials is reduced to a certain extent, and an economical and efficient gas extraction process is realized.
Drawings
FIG. 1 is a schematic diagram of a real-time preparation and hole sealing system for a coal-based composite hole sealing material in the drilling process;
FIG. 2 is a schematic diagram of the structure of the coal dust generation system of the present invention;
FIG. 3 is a schematic diagram of the coal dust separation and material preparation system of the present invention;
FIG. 4 is a schematic diagram of a pore sealing system for a coal-based composite material according to the present invention;
FIG. 5 is a schematic of the microstructure of the coal-based composite cementing of the present invention.
In the figure: the device comprises a 1-coal seam, a 2-drill bit, a 3-coal sucking hole, a 4-rotating component, a 5-drill rod inner cavity, a 6-drill rod outer wall, a 7-drill hole, a 8-drill rod connecting screw thread, a 9-drill machine system, a 10-drill machine control table, a 11-sleeve straight-through valve, a 12-negative pressure extraction pipe, a 13-pipe hole, a 14-negative pressure meter and flowmeter, a 15-negative pressure system, a 16-baffle clamping groove, a 17-coal dust particle size screening baffle 1#, a 18-coal dust discharging hole 1#, a 19-coal dust particle size screening baffle 2#, a 20-coal dust discharging hole 2#, a 21-residual material outlet, a 22-exhaust hole, a 23-gauze filter, a 24-negative pressure motor, a 25-coal dust conveying belt, a 26-connecting pipeline, a 27-slurry generator, a 28-material/water inlet, a 29-electric stirrer, a 30-slurry outlet valve, a 31-slurry pump, a 32-slurry valve, a 33-slurry extraction screen valve, a 34-slurry returning hole, a 35-expansion bag 1#, a 36-expansion bag 2#, a 37-slurry outlet 1#, a 39-slurry outlet 38, a 39-slurry outlet 2#, a 39-slurry inlet, a 43 # and a 43-slurry injection material.
Detailed Description
The invention will be further described with reference to examples of embodiments shown in the drawings.
The device comprises a coal dust generation system, a coal dust separation system, a coal-based composite material preparation system and a coal-based composite material hole sealing system. The coal dust generation system is provided by a drill rod positioned in a coal seam 1, a drill bit 2 is arranged at the end part of the drill rod, a coal suction hole 3 is formed in the circumference of the drill bit 2, the drill bit is driven by a drill system 9, the drill system 9 is controlled by a drill control platform 10, the outer wall 6 of the drill rod is connected with the drill bit through a rotating assembly 4, the inner cavity 5 of the drill rod is communicated with the coal suction hole 3, the drill rod consists of a plurality of sections, the adjacent drill rods are connected by connecting threads 8, the start and stop of the drill system 9 are controlled by the drill control platform 10, the connecting action of the connecting threads 8 of the drill rod enables the outer wall 6 of the drill rod to extend into a drill hole 7, the drill rod system is started to drive the rotating assembly 4 to drive the drill bit 2 to rotationally cut the coal seam 1, and generated coal dust particles 44 flow into the inner cavity 5 of the drill rod through the drill bit through the drill hole 3, and the main functions are that coal dust generated in the coal dust drilling process is captured; the coal dust separating system comprises a negative pressure extraction pipe 12, the left end of the negative pressure extraction pipe 12 is fixedly connected with the outer wall 6 of a drill rod through a sleeve straight-through valve 11, the right end of the negative pressure extraction pipe 12 stretches into a negative pressure system 15, a vertical parallel coal dust particle size screening baffle 1#17 and a coal dust particle size screening baffle 2#19 are sequentially arranged in the negative pressure system 15, a baffle is further arranged at the bottom of the negative pressure system 15, a coal dust discharge port 1#18 and a coal dust discharge port 2#20 are arranged on the baffle, the coal dust particle size screening baffle is fixedly connected with the baffle through a clamping groove 16 on the baffle, the coal dust discharge port 1#18 is positioned at the bottom of the left end of the coal dust particle size screening baffle 1#17, the coal dust discharge port 2#20 is positioned at the bottom of the left end of the coal dust particle size screening baffle 2#19, a negative pressure motor 24 and an exhaust port 22 are further arranged on the negative pressure system, a residue outlet 21 is arranged on the baffle opposite to the exhaust port 22, a coal dust conveying belt 25 is arranged at the bottom of the baffle, the negative pressure extraction pipe 12 is provided with four pipe holes 13 and is provided with a negative pressure meter and a flowmeter 14, the exhaust port 22 is provided with a gauze filter screen 23, the sleeve straight-through valve 11 connects the drill rod outer wall 6 with the negative pressure extraction pipe 12, the negative pressure extraction pipe 12 is provided with four pipe holes 13 and is provided with the negative pressure meter and the flowmeter 14 to measure comprehensive technical parameters, the negative pressure motor 24 drives the negative pressure system 15 to extract coal dust particles 44 manufactured by the coal dust generating system, a baffle clamping groove 16 is replaced with a screening baffle (the coal dust particle size screening baffle 1#17 and the coal dust particle size screening baffle 2#19) for filtering the coal dust particles 44, the gauze filter screen 23 is used for filtering coal dust-gas, the screened coal dust particles 44 with the particle size larger than 3mm are filtered from the coal dust discharge port 1#18, the coal dust discharge port 2#20 is filtered for filtering the coal dust particles 44 with the particle size of 1-3 mm, the residue outlet 21 filters out coal dust particles 44 with the particle size smaller than 1mm, gas is discharged from the gas outlet 22, and the discharged coal dust particles 44 are conveyed by the coal dust conveying belt 25; the coal-based composite material preparation system comprises a slurry generator 27, wherein a stirrer 29 is arranged in the slurry generator 27, a material/water inlet 28 is arranged at the top of the slurry generator, a slurry outlet valve 30 is arranged at the bottom of the slurry generator, the top of the slurry generator 27 is connected with a coal dust conveying belt 25 through a connecting pipeline 26, the coal dust conveying belt 25 and the slurry generator are connected through the connecting pipeline 26, and cement materials, latex powder and water are mixed according to the following ratio of 1:0.1:1.2 ratio pouring/water inlet, connecting coal dust conveyor 25 and slurry generator 27 by connecting pipe 26, mixing cement material, latex powder and water according to 1:0.1:1.2, the slurry is uniformly mixed by an electric stirrer 29 through a pouring material/water inlet 28, and the prepared slurry is controlled to flow out by a slurry outlet valve 30 for use, and the main function is to prepare a coal-based composite hole sealing material by using coal dust particles 44 with different particle diameters; the coal-based composite material hole sealing system comprises a grouting pipeline, wherein the grouting pipeline is positioned in a drill hole, the tail end of the grouting pipeline is provided with an expansion bag 1#35 and an expansion bag 2#36, the grouting pipeline is provided with a slurry outlet 1#37 positioned at the position of the expansion bag 1#and a slurry outlet 2#39 positioned at the position of the expansion bag 2#and a blast hole is arranged on the grouting pipeline between the slurry outlet 1#and the slurry outlet 2#, the blast hole is provided with a blast valve 38, the coal-based composite material hole sealing system further comprises a slurry returning pipe, the slurry returning pipe passes through the expansion bag 1#and the rear end part of the slurry returning pipe is positioned between the expansion bag 1#and the expansion bag 2#and further comprises a pumping screen pipe, the rear end part of the pumping screen pipe extends out of the expansion bag 2#and is positioned at the bottom of the drill hole on the right side of the expansion bag 2#, and the front ends of the pumping screen pipe and the slurry returning pipe are positioned outside the drill hole, the front end of the grouting pipeline is connected with the grouting pump 31, the grouting pump 31 is connected with the grouting valve 30 at the bottom of the slurry generator through a pipeline, the grouting pipeline is provided with the grouting valve 32, the grouting screen pipe is provided with the grouting screen pipe valve 33, the bearing upper limit of the blasting valve 38 is 0.5MPa, the grouting pump 31 is connected with the grouting valve 30 and the grouting valve 32, firstly, the coal-based hole sealing material slurry 41 is injected into the expansion bags 1#35 and 2#36 through the slurry outlet 1#37 and the slurry outlet 2#39, when the grouting pressure reaches 0.5MPa, the blasting valve 38 is opened, after the coal-based hole sealing material slurry 41 is fully injected between the two bags, the slurry returning port 34 is in a reverse grouting phenomenon, the grouting screen pipe valve 33 is opened after the slurry is solidified, and gas enters the gas inlet 40 of the coal bed. The coal-based hole sealing material slurry 41 consists of cement particles 42, coal dust particles 44 and latex 43, wherein the latex 43 can bond the cement particles 42 and the coal seam 1, and the coal dust particles 44 are used as a filler to be filled between cement hydration product crystals, so that the compaction degree of a material consolidated body is improved.
A hole sealing method for a coal-based composite hole sealing material real-time preparation and hole sealing device in a drilling process comprises the following steps:
firstly, acquiring coal dust particles 44 by using a coal dust generation system, controlling the starting and stopping of a drilling machine system 9 by using a drilling machine control table 10, driving a drill bit 2 to rotationally cut a coal seam 1 by using a rotating assembly 4, and enabling the generated coal dust particles 44 to flow from a drill bit opening 3 to a drill rod inner cavity 5; simultaneously, the negative pressure system 15 is started, and most of generated coal dust particles 44 are sucked into the negative pressure extraction pipe 12 by utilizing the negative pressure generated by the negative pressure motor 24;
secondly, screening coal dust particles 44 by utilizing a coal dust separation system, sucking the coal dust particles 44 in the negative pressure extraction pipe 12 to a coal dust particle size screening baffle by utilizing negative pressure generated by a negative pressure motor 24, respectively filtering out the coal dust particles 44 with different particle sizes by using a coal dust particle size screening baffle 1#17 with the aperture of 3mm and a coal dust particle size screening baffle 2#19 with the aperture of 1mm, filtering out the coal dust particles 44 with the particle size of more than 3mm from a coal dust discharge port 1#18, filtering out the coal dust particles 44 with the particle size of 1-3 mm by using a coal dust discharge port 2#20, and filtering out the coal dust particles 44 with the particle size of less than 1mm by using a residue outlet 21;
thirdly, preparing coal-based composite hole sealing materials with different particle sizes by using a coal-based composite material preparation system, selecting coal dust particles 44 with different particle sizes as a filler according to different areas of a slurry plugging drill hole 7, for example, plugging coal seam cracks, conveying the coal dust particles 44 with particle sizes smaller than 1mm to a slurry generator 27 through a coal dust conveying belt 25, conveying the mixed coal dust particles 44 with particle sizes larger than 3mm or 1-3 mm to the slurry generator 27 through the coal dust conveying belt 25 in the plugging drill hole area, and forming a consolidated body with compact structure, wherein the coal dust particles 44 are good in bonding performance of the coal-based composite hole sealing materials prepared by mixing cement, latex powder and water. The drill cuttings amount of each meter of drill rod is about 1kg, and the ratio of the prepared coal-based composite hole sealing material prepared by the coal dust particles with different particle diameters is 0.1:1:0.1:1.2, and uniformly mixing the materials.
Fourth, the drilling holes 7 are plugged by using a coal-based composite material hole sealing system, the coal-based hole sealing material slurry 41 in the slurry generating device 27 is pumped by using a slurry pump 31, the expansion bags 1#35 and 2#36 are firstly injected in a hole sealing mode of 'two plugging one injection', the drilling coal seam 1 is supported by the expansion bags, the explosion valve 38 is opened when the grouting pressure reaches 0.5MPa, the coal-based hole sealing material slurry 41 is injected into a plugging interval, the pumping screen valve 33 is opened after the slurry is solidified, and coal seam 1 gas is pumped from the screen gas inlet 40. The coal-based hole sealing material slurry 41 consists of cement particles 42, coal dust particles 44 and latex 43, wherein the latex 43 can bond the cement particles 42 and the coal seam 1, and the coal dust particles 44 are used as a filler to be filled between cement hydration product crystals, so that the compaction degree of a material consolidated body is improved.
The previous description of the embodiments is provided to facilitate a person of ordinary skill in the art in order to make and use the present invention. It will be apparent to those skilled in the art that various modifications can be readily made to these embodiments and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the embodiments described herein, and those skilled in the art, based on the present disclosure, should make improvements and modifications without departing from the scope of the present invention.
Claims (5)
1. The utility model provides a coal-based composite hole sealing material prepares and hole sealing device in real time in drilling process which characterized in that: the device comprises a coal dust generation system, a coal dust separation system connected with an outlet of the coal dust generation system, a coal-based composite material preparation system connected with the coal dust separation system, and a coal-based composite material hole sealing system connected with the coal-based composite material preparation system; the coal dust generation system is provided by a drill rod positioned in a coal layer, a drill bit is arranged at the end part of the drill rod, a coal suction hole is formed in the circumference of the drill bit, the drill bit is driven by a drilling machine system, the drilling machine system is controlled by a drilling machine control table, the outer wall of the drill rod is connected with the drill bit through a rotating assembly, and the inner cavity of the drill rod is communicated with the coal suction hole; the coal dust separation system comprises a negative pressure extraction pipe, the left end of the negative pressure extraction pipe is fixedly connected with the outer wall of a drill rod through a sleeve straight-through valve, the right end of the negative pressure extraction pipe stretches into the negative pressure system, a vertical parallel coal dust particle size screening baffle 1#, a coal dust particle size screening baffle 2# are sequentially arranged in the negative pressure system, a baffle is further arranged at the bottom of the negative pressure system, a coal dust discharge port 1# and a coal dust discharge port 2# are arranged on the baffle, the coal dust particle size screening baffle is fixedly connected with the baffle through a clamping groove on the baffle, the coal dust discharge port 1# is positioned at the bottom of the left end of the coal dust particle size screening baffle 1#, the coal dust discharge port 2# is positioned at the bottom of the left end of the coal dust particle size screening baffle 2#, a negative pressure motor and an exhaust port are further arranged on the negative pressure system, a residue outlet is arranged on the baffle opposite to the exhaust port, a coal dust conveying belt is arranged at the bottom of the baffle, four pipe holes are formed in the negative pressure extraction pipe, a negative pressure meter and a flowmeter are arranged on the exhaust port, and a gauze filter screen is arranged on the exhaust port; the coal-based composite hole sealing system comprises a grouting pipeline, wherein the grouting pipeline is positioned in a drill hole, an expansion bag 1# and an expansion bag 2# are arranged at the tail end of the grouting pipeline, a slurry outlet 1# is formed in the position of the expansion bag 1# on the grouting pipeline, a slurry outlet 2# is formed in the position of the expansion bag 2# on the grouting pipeline, a rupture port is formed in the grouting pipeline between the slurry outlet 1# and the slurry outlet 2#, a blasting valve is arranged on the rupture port, the coal-based composite hole sealing system further comprises a slurry returning pipe, the slurry returning pipe penetrates through the expansion bag 1# and the rear end part of the slurry returning pipe is positioned between the expansion bag 1# and the expansion bag 2# and further comprises a pumping screen pipe, the rear end part of the pumping screen pipe extends out of the expansion bag 2# and is positioned at the bottom of the drill hole on the right side of the expansion bag, the pumping screen pipe and the front end of the slurry returning pipe are both positioned on the outer side of the drill hole, the front end of the grouting pipeline is connected with a slurry pumping pump through the pipeline and the bottom slurry outlet valve.
2. The device for preparing and sealing the coal-based composite sealing material in real time in the drilling process according to claim 1, wherein the device is characterized in that: the drill rods are formed by multiple sections, and adjacent drill rods are connected through connecting threads.
3. The device for preparing and sealing the coal-based composite sealing material in real time in the drilling process according to claim 1, wherein the device is characterized in that: the preparation system of the coal-based composite material comprises a slurry generator, wherein a stirrer is arranged in the slurry generator, a material/water inlet is arranged at the top of the slurry generator, a slurry outlet valve is arranged at the bottom of the slurry generator, and the top of the slurry generator is connected with a coal dust conveying belt through a connecting pipeline.
4. The device for preparing and sealing the coal-based composite sealing material in real time in the drilling process according to claim 3, wherein the device comprises: the grouting pipeline is provided with a grouting valve, the extraction sieve tube is provided with an extraction sieve tube valve, and the pressure-bearing upper limit of the blasting valve is 0.5MPa.
5. The hole sealing method for the coal-based composite hole sealing material real-time preparation and hole sealing device in the drilling process according to any one of claims 1 to 4, which is characterized by comprising the following steps:
s1, acquiring coal dust particles by using a coal dust generation system, controlling the start and stop of the drilling machine system by using a drilling machine control console, enabling the generated coal dust particles to flow from a coal suction hole to an inner cavity of a drill rod, and simultaneously starting a negative pressure system, and sucking the generated coal dust particles into a negative pressure extraction pipe by using negative pressure generated by a negative pressure motor;
s2, screening coal dust particles by using a coal dust separation system, filtering out the coal dust particles with different particle sizes by a coal dust particle size screening baffle 1# with the aperture of 3mm and a coal dust particle size screening baffle 2# with the aperture of 1mm, filtering out the coal dust particles with the particle size of more than 3mm from a coal dust discharge port 1#, filtering out the coal dust particles with the particle size of 1-3 mm from a coal dust discharge port 2#, and filtering out the coal dust particles with the particle size of less than 1mm from a residue outlet;
s3, preparing coal-based composite hole sealing materials with different particle sizes by using a coal-based composite material preparation system, conveying coal dust to a slurry generator through a material conveying belt, and mixing the coal dust with cement, emulsion powder and water according to the mass ratio of 0.1:1:0.1:1.2, preparing a coal-based composite hole sealing material;
s4, plugging a drilled hole by using a coal-based composite material hole sealing system, pumping coal-based composite hole sealing material slurry in a slurry generating device by using a slurry pump, injecting an expansion bag 1# in a hole sealing mode of 'two plugs and one injection', supporting a drilled coal bed by using the expansion bag 2# at first, opening a blasting valve when the grouting pressure reaches 0.5MPa, injecting the coal-based hole sealing material slurry into a plugging interval, opening a suction screen valve after the slurry is solidified, and pumping coal bed gas from a screen gas inlet.
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| CN202211286242.2A CN115559685B (en) | 2022-10-20 | 2022-10-20 | Device and method for preparing and sealing coal-based composite hole sealing material in real time in drilling process |
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| CN202211286242.2A CN115559685B (en) | 2022-10-20 | 2022-10-20 | Device and method for preparing and sealing coal-based composite hole sealing material in real time in drilling process |
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| EP1923369A1 (en) * | 2006-11-17 | 2008-05-21 | Elotex AG | Dry cement mix for cementing wellbores. |
| CN103790546B (en) * | 2014-02-14 | 2016-08-17 | 河南理工大学 | Gas pre-drainage boring ickings backfill method for sealing |
| CN104314508B (en) * | 2014-08-19 | 2018-04-20 | 淮阴工学院 | A kind of method for sealing for the drilling of coal-bed gas pump drainage |
| CN205743827U (en) * | 2016-04-29 | 2016-11-30 | 河南理工大学 | Mash gas extraction drilling cuttings backfills pouch slip casting type hole packer |
| CN107011881A (en) * | 2017-05-24 | 2017-08-04 | 河南理工大学 | A kind of mining ickings base hole-sealing grouting material and prepare hole-sealing technology |
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