CN115559685A - Device and method for preparing coal-based composite hole sealing material in real time and sealing holes in drilling process - Google Patents
Device and method for preparing coal-based composite hole sealing material in real time and sealing holes in drilling process Download PDFInfo
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- CN115559685A CN115559685A CN202211286242.2A CN202211286242A CN115559685A CN 115559685 A CN115559685 A CN 115559685A CN 202211286242 A CN202211286242 A CN 202211286242A CN 115559685 A CN115559685 A CN 115559685A
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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
- 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 DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
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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
- E21B47/005—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
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 a drilling process.
Description
Technical Field
The invention belongs to the technical field of development and equipment of a coal mine underground gas extraction drilling hole sealing material, 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 gas pressure of a coal bed is increased, the risks of mine gas emission, gas ejection, coal (rock) and gas outburst and the like exist, and the coal mine gas drainage is controlled in time, so that the safety production under the coal mine is facilitated. The existing coal mine gas control technology mainly comprises gas extraction, coal seam water injection, hydraulic fracturing and other technologies, and by adopting the coal seam gas extraction technology, the gas emission, the gas overrun and the outburst accidents in coal seam mining can be effectively reduced. A large amount of coal dust is easily generated in the coal seam drilling process, so that the environmental pollution is caused, the coal resource is wasted, and the secondary utilization of the coal dust particles can realize the effects of saving resources and realizing green mining. The traditional inorganic hole sealing material generally has the defects of dehydration shrinkage, low early strength, poor impermeability and the like, and is difficult to fully seal a drilled hole; the organic hole sealing material has the advantages of low viscosity, strong cohesiveness and easy penetration into fine cracks, but the material has the defects of high toxicity, poor flame retardance and high cost and is limited in the application of hole sealing in coal mines. The cement material is widely applied at present, the material is low in cost, wide in material source and simple in construction process, coal scraps are used as waste of coal mining, the coal scraps and other additives are used for developing a coal-based composite hole sealing material, the important means for treating underground waste and cleanly utilizing coal is achieved, secondary utilization and zero emission of waste are achieved, underground environment pollution is reduced, local material can be used, cost investment is reduced, and efficient comprehensive utilization of coal resources is promoted.
According to the invention, through the development and utilization of the coal-based composite hole sealing material, the bonding performance of the inorganic hole sealing material and the coal wall of the drilled hole is improved, the coal dust admixtures with different particle sizes are controlled to realize the efficient plugging of the fracture of the drilled hole, and the consolidated body has a compact pore structure through the filling effect of the 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 division and cooperation of various subsystems, the coal dust generation system is used for manufacturing coal dust particles, the coal dust separation system is used for screening the 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 sealing a drilled hole in real time, a way reference is 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 the hole sealing system and the technology provide a new using technical method, so that the drainage efficiency of coal bed gas is improved.
In order to achieve the purpose, the invention adopts the technical scheme that:
a device for preparing and sealing coal-based composite hole sealing materials in real time in a drilling process comprises a coal dust generating system, a coal dust separating system connected with an outlet of the coal dust generating system, a coal-based composite material preparing system connected with the coal dust separating system, and a coal-based composite material hole sealing system connected with the coal-based composite material preparing system.
Furthermore, the coal dust generation system is provided by drill rods positioned in the coal layer, drill bits are arranged at the end parts of the drill rods, coal suction holes are formed in the circumferences of the drill bits, the drill bits are driven by a drilling machine system, the drilling machine system is controlled by a drilling machine console, the outer walls of the drill rods are connected with the drill bits through rotating assemblies, inner cavities of the drill rods are communicated with the coal suction holes, the drill rods are composed of multiple sections, and adjacent drill rods are connected through connecting screw threads; the drilling machine control table controls the starting and stopping of the drilling machine system, the outer wall of the drill rod extends into a drilled hole under the connecting action of the drill rod connecting screw threads, the rotary assembly of the drilling machine system drives the drill bit to rotate to cut a coal bed, generated coal dust particles flow to the inner cavity of the drill rod through the drill bit opening, and the coal dust generated in the coal bed drilling process is captured.
Furthermore, 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 the drill rod through a sleeve straight-through valve, the right end of the negative pressure extraction pipe extends into the negative pressure system, a vertical and parallel coal dust particle size screening baffle 1# and 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 in 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# and 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 residual material outlet is arranged on the baffle right opposite to the exhaust port, and 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 installed, a gauze filter screen is arranged on an exhaust port, the outer wall of a drill rod is connected with the negative pressure extraction pipe through a sleeve direct valve, four pipe holes are formed in the negative pressure extraction pipe, the negative pressure meter and the flowmeter are installed to measure comprehensive technical parameters, a negative pressure motor drives a negative pressure system to extract coal dust particles manufactured by a coal dust generation system, a uniform-aperture screen (aperture 3mm and aperture 1 mm) screening baffle (coal dust particle size screening baffle 1#, and coal dust particle size screening baffle 2 #) is replaced at a baffle clamping groove to filter the coal dust particles, the gauze filter screen is used for filtering coal dust-gas, the screened coal dust is filtered from a coal dust discharge port 1# to filter coal dust particles with the particle size of more than 3mm, a coal dust discharge port 2# is filtered to filter coal dust particles with the particle size of 1-3 mm, and a residual material outlet is filtered to filter coal dust particles with the particle size of less than 1mm, the gas is discharged from the gas outlet, and the flowing coal dust particles are conveyed by the coal dust conveying belt.
Further, coal-based combined material preparation system include the thick liquid generator, be equipped with the agitator in the thick liquid generator, its top is equipped with material/water entry, the bottom is equipped with out the thick liquid valve, the thick liquid generator top is passed through the connecting tube and is linked to each other with coal cinder fortune material area, connects coal cinder fortune material area and thick liquid generating device by the connecting tube, with cement material, emulsion powder and water according to 1:0.1:1.2, uniformly mixing the slurry by using an electric stirring device, controlling the prepared slurry to flow out by using a slurry outlet valve, and mainly preparing the coal-based composite hole sealing material by using coal dust particles with different particle sizes.
Furthermore, the coal-based composite material hole sealing system comprises a grouting pipeline, the grouting pipeline is positioned in the drill hole, the tail end of the grouting pipeline is provided with an expansion bag 1# and an expansion bag 2#, a grout outlet 1# is arranged at the position of the expansion bag 1# on the grouting pipeline, a grout outlet 2# is arranged at the position of the expansion bag 2# on the grouting pipeline, a blasting port is arranged on the grouting pipeline between the grout outlet 1# and the grout outlet 2#, a blasting valve is arranged on the blasting port, and the grouting pipeline also comprises a grout return pipe, the slurry return pipe penetrates through the expansion bag 1#, the rear end part of the slurry return pipe is positioned between the expansion bag 2#, the slurry return pipe also comprises an extraction sieve pipe, the rear end part of the extraction sieve pipe extends out of the expansion bag 2#, and is positioned at the bottom of a drill hole on the right side of the extraction sieve pipe, the front ends of the extraction sieve tube and the slurry return tube are positioned outside the drill hole, the front end of the grouting pipeline is connected with a slurry pump, the slurry pump is connected with a slurry outlet valve at the bottom of the slurry generator through a pipeline, the grouting pipeline is provided with a grouting valve, the extraction sieve pipe is provided with an extraction sieve pipe valve, the upper limit of the pressure bearing of the explosion valve is 0.5MPa, the slurry outlet pipe and the grouting pipe are connected by a slurry pump, firstly, coal-based hole sealing material slurry is injected into the expansion bag 1# and the expansion bag 2# from the slurry outlet 1# and the slurry outlet 2# and the explosion valve is opened when the grouting pressure reaches 0.5MPa, and after the coal-based hole sealing material slurry is filled between the two bags, the slurry returning port has a slurry returning phenomenon, the slurry is solidified and then the valve of the extraction sieve tube is opened, coal bed gas enters the gas inlet of the sieve tube, the slurry of the coal-based hole sealing material is composed of cement particles, coal dust particles and latex, the latex can bond the cement particles and the coal bed, and the coal dust particles are filled between crystals of cement hydration products as a filling agent, so that the compactness of a 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, coal dust particles are obtained by a coal dust generation system, a drilling machine console controls the starting and stopping of a drilling machine system, a drill bit is driven by a drill bit rotating device to rotate to cut a coal bed, and the generated coal dust particles flow to an inner cavity of a drill rod from an opening of the drill bit; simultaneously, a negative pressure system is started, and most of generated coal dust particles are sucked 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, respectively filtering the coal dust particles with different particle sizes through 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 the coal dust particles with the particle size larger than 3mm from a coal dust discharge port 1#, filtering the coal dust particles with the particle size of 1-3 mm from a coal dust discharge port 2#, and filtering the coal dust particles with the particle size smaller than 1mm from a residual material 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 with cement, emulsion powder and water according to a mass ratio of 0.1:1:0.1:1.2 preparing a coal-based composite hole sealing material;
s4, plugging a drill 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, firstly injecting an expansion bag 1# and an expansion bag 2# to support a drilled coal layer by adopting a two-plug one-injection hole sealing mode, opening a blast valve when the grouting pressure reaches 0.5MPa, injecting the coal-based hole sealing material slurry into a plugging interval, opening a valve of a pumping sieve pipe after the slurry is solidified, and pumping coal layer gas from a gas inlet of the sieve pipe.
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, the coal-based composite hole sealing material with different particle sizes is prepared for the drilling and sealing process, a solidified body has a compact pore structure through the filling effect of the coal dust particles, and cement particle hydration product crystals and a coal bed are bonded by emulsion; 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 tested by site construction, the coal-based materials can be further analyzed, optimized and developed, the use amount of the aggregate and other costs of the hole sealing materials is reduced to a certain extent, and the economic and efficient gas extraction process is realized.
Drawings
FIG. 1 is a schematic structural diagram of a system for preparing and sealing coal-based composite hole sealing materials in real time in a drilling process according to the invention;
FIG. 2 is a schematic diagram of a coal dust generation system according to the present invention;
FIG. 3 is a schematic diagram of a coal dust separation and material preparation system according to the present invention;
FIG. 4 is a schematic structural diagram of the coal-based composite sealing system of the present invention;
FIG. 5 is a schematic view of the microstructure of the coal-based composite material of the present invention in a consolidated form.
In the figure: 1-coal bed, 2-drill bit, 3-coal suction hole, 4-rotating component, 5-drill rod inner cavity, 6-drill rod outer wall, 7-drill hole, 8-drill rod connecting screw thread, 9-drilling machine system, 10-drilling machine control table, 11-casing straight-through valve, 12-negative pressure extraction pipe, 13-pipe hole, 3-drill rod outer wall 14-negative pressure meter and flowmeter, 15-negative pressure system, 16-baffle clamping groove, 17-coal dust particle size screening baffle 1#, 18-coal dust discharge port 1#, 19-coal dust particle size screening baffle 2#, 20-coal dust discharge port 2#, 21-excess material outlet, 22-exhaust port 23-a gauze filter screen, 24-a negative pressure motor, 25-a coal cinder conveying belt, 26-a connecting pipeline, 27-a slurry generator, 28-a material/water inlet, 29-an electric stirrer, 30-a slurry outlet valve, 31-a slurry pump, 32-a slurry injection valve, 33-a slurry extraction screen valve, 34-a slurry return port, 35-an expansion bag 1#, 36-an expansion bag 2#, 37-a slurry outlet port 1#, 38-an explosion valve, 39-a slurry outlet port 2#, 40-a screen pipe gas inlet, 41-coal-based hole sealing material slurry, 42-cement particles, 43-emulsion and 44-coal cinder particles.
Detailed Description
The invention will be further described with reference to the following examples of embodiments shown in the drawings.
As shown in the figure, the device for preparing and sealing the hole by using the coal-based composite hole sealing material in the drilling process comprises a coal dust generating system, a coal dust separating system, a coal-based composite material preparing system and a coal-based composite material hole sealing system. The coal dust generating 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 absorbing 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 console 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 absorbing hole 3, the drill rod consists of a plurality of sections, the adjacent drill rods are connected through connecting screw threads 8, the start and stop of the drill system 9 are controlled by the drill console 10, the outer wall 6 of the drill rod is extended and extended into a drill hole 7 under the connecting action of the connecting screw threads 8 of the drill rod, the rotating assembly 4 is started and driven by the drill system to drive the drill bit 2 to rotate to cut the coal seam 1, generated coal dust particles 44 flow to the inner cavity 5 of the drill rod from the drill bit opening 3, and the coal dust particles are mainly used for capturing coal dust generated in the coal seam drilling process; the coal dust separation 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 casing straight-through valve 11, the right end of the negative pressure extraction pipe 12 extends into a negative pressure system 15, a vertical and 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 residual material outlet 21 is arranged on the baffle opposite to the exhaust port 22, and a coal dust material belt 25 is arranged at the bottom of the baffle, four pipe holes 13 are formed in the negative pressure extraction pipe 12, a negative pressure meter and a flowmeter 14 are installed on the negative pressure extraction pipe 12, a gauze filter screen 23 is arranged on an exhaust port 22, a casing straight-through valve 11 is used for connecting the outer wall 6 of the drill pipe with the negative pressure extraction pipe 12, four pipe holes 13 are formed in the negative pressure extraction pipe 12, the negative pressure meter and the flowmeter 14 are installed for measuring comprehensive technical parameters, a negative pressure motor 24 is used for driving a negative pressure system 15 to extract coal dust particles 44 produced by a coal dust generating system, screening baffles (coal dust particle size screening baffles 1#17 and coal dust particle size screening baffles 2# 19) with uniform pore sizes (pore sizes of 3mm and 1 mm) are replaced at a baffle clamping groove 16 for filtering the coal dust particles 44, the gauze filter screen 23 is used for filtering coal dust-gas, the screened coal dust is filtered into the coal dust particles 44 with particle sizes larger than 3mm from a coal dust discharge port 1#18, a coal dust discharge port 2#20 is used for filtering the coal dust particles 44 with particle sizes of 1 to 3mm, the residual material outlet 21 filters coal dust particles 44 with the particle size smaller than 1mm, gas is discharged from the gas outlet 22, and the flowing coal dust particles 44 are conveyed through the coal dust conveying belt 25; coal-based combined material preparation system includes slurry generator 27, is equipped with agitator 29 in slurry generator 27, and its top is equipped with material/water entry 28, and the bottom is equipped with out thick liquid valve 30, and slurry generator 27 top is passed through connecting tube 26 and is linked to each other with coal cinder fortune material area 25, connects coal cinder fortune material area 25 and slurry generator by connecting tube 26, with cement material, emulsion powder and water according to 1:0.1:1.2, the material/water inlet is poured in proportion, the coal dust conveying belt 25 and the slurry generator 27 are connected through the connecting pipeline 26, and the cement material, the emulsion powder and the water are mixed according to the proportion of 1:0.1:1.2, pouring the slurry into a material/water inlet 28, uniformly mixing the slurry by using an electric stirrer 29, controlling the prepared slurry to flow out by using a slurry outlet valve 30, and mainly preparing the coal-based composite hole sealing material by using coal dust particles 44 with different particle sizes; 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 at the position of the expansion bag 1#, the grouting pipeline is provided with a slurry outlet 2#39 at the position of the expansion bag 2# and is provided with a blasting port between the slurry outlet 1# and the slurry outlet 2#, the blasting port is provided with a blasting valve 38 and further comprises a slurry return pipe, the slurry return pipe penetrates through the expansion bag 1#, the rear end part of the slurry return pipe is positioned between the expansion bag 1# and the expansion bag 2#, the slurry extraction sieve pipe is also arranged, the rear end part of the slurry extraction sieve 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, and the front ends of the extraction sieve pipe and the slurry return pipe are positioned outside the drill hole, the front end of the grouting pipeline is connected with a slurry pump 31, the slurry pump 31 is connected with a slurry outlet valve 30 at the bottom of a slurry generator through a pipeline, a grouting valve 32 is arranged on the grouting pipeline, an extraction sieve tube valve 33 is arranged on an extraction sieve tube, the upper limit of the pressure bearing of the explosion valve 38 is 0.5MPa, the slurry outlet valve 30 and the grouting valve 32 are connected by adopting the slurry pump 31, firstly, coal-based hole sealing material slurry 41 is injected into an expansion bag 1#35 and an expansion bag 2#36 from a slurry outlet port 1#37 and a slurry outlet port 2#39, the explosion valve 38 is opened when the grouting pressure reaches 0.5MPa, after the coal-based hole sealing material slurry 41 is fully injected between the two bags, the slurry return port 34 has a slurry reaction phenomenon, the extraction sieve tube valve 33 is opened after the slurry is solidified, and coal-bed gas enters a sieve tube inlet 40. The coal-based hole sealing material slurry 41 consists of cement particles 42, coal dust particles 44 and emulsion 43, the emulsion 43 can bond the cement particles 42 and the coal seam 1, and the coal dust particles 44 are filled among crystals of a cement hydration product as a filling agent, so that the compactness of a 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:
firstly, coal dust particles 44 are obtained by a coal dust generation system, the starting and stopping of a drilling machine system 9 are controlled by a drilling machine console 10, a drill bit 2 is driven by a rotary component 4 to rotate to cut a coal seam 1, and the generated coal dust particles 44 flow to an inner cavity 5 of a drill rod from an opening 3 of the drill bit; simultaneously, the negative pressure system 15 is started, and most of the generated coal dust particles 44 are sucked into the negative pressure extraction pipe 12 by using the negative pressure generated by the negative pressure motor 24;
secondly, screening the coal dust particles 44 by using 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 using negative pressure generated by a negative pressure motor 24, respectively filtering the coal dust particles 44 with different particle sizes from a coal dust particle size screening baffle 1#17 with a pore size of 3mm and a coal dust particle size screening baffle 2#19 with a pore size of 1mm, filtering the coal dust particles 44 with particle sizes larger than 3mm from a coal dust discharge port 1#18, filtering the coal dust particles 44 with particle sizes of 1 to 3mm from a coal dust discharge port 2#20, and filtering the coal dust particles 44 with particle sizes smaller than 1mm from a residual material 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 filling agents according to different areas of the slurry plugging drill hole 7, wherein for example, coal dust particles 44 with particle sizes smaller than 1mm are selected for plugging coal seam cracks and are conveyed to a slurry generator 27 through a coal dust conveying belt 25, mixed coal dust particles 44 with particle sizes larger than 3mm or 1-3 mm are selected for plugging drill hole areas and are conveyed to the slurry generator 27 through the coal dust conveying belt 25, and the coal-based composite hole sealing materials prepared by mixing the coal dust particles 44 with cement, emulsion powder and water are good in bonding performance, and can form a solidified body with a compact structure. The drilling cuttings per meter of drill rod are about 1kg, and the coal-based composite hole sealing material prepared from the prepared coal dust particles with different particle sizes is prepared by mixing the following components in parts by weight: 1:0.1:1.2, and mixing uniformly.
Fourthly, plugging the drill hole 7 by using a coal-based composite material hole sealing system, extracting coal-based hole sealing material slurry 41 in the slurry generating device 27 by using a slurry pump 31, firstly injecting expansion bags 1#35 and 2#36 to support the drilled coal seam 1 by adopting a two-plugging one-injection hole sealing mode, opening a blast valve 38 when the slurry injection pressure reaches 0.5MPa, injecting the coal-based hole sealing material slurry 41 into a plugging interval, opening an extraction screen valve 33 after the slurry is solidified, and extracting 1 gas from the screen gas inlet 40. The coal-based hole sealing material slurry 41 consists of cement particles 42, coal dust particles 44 and emulsion 43, the emulsion 43 can bond the cement particles 42 and the coal seam 1, and the coal dust particles 44 are filled among cement hydration product crystals as a filling agent, so that the compactness of a material consolidation body is improved.
The embodiments described above are intended to facilitate a person skilled in the art to understand and use the invention. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, 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 should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (9)
1. The utility model provides a real-time preparation of compound hole sealing material of coal base and hole sealing device of in-process of drilling which characterized in that: the coal-based composite material hole sealing system comprises a coal dust generating system, a coal dust separating system connected with an outlet of the coal dust generating system, a coal-based composite material preparing system connected with the coal dust separating system, and a coal-based composite material hole sealing system connected with the coal-based composite material preparing system.
2. The device for preparing and sealing coal-based composite hole sealing material in real time in the drilling process according to claim 1, characterized in that: the coal dust generating 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 absorbing 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 console, 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 absorbing hole.
3. The device for preparing and sealing coal-based composite sealing materials in real time in the drilling process according to claim 2, wherein: the drill rods are composed of a plurality of sections, and adjacent drill rods are connected through connecting screw threads.
4. The device for preparing and sealing coal-based composite sealing materials in real time in the drilling process according to claim 1, wherein: 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 extends into a negative pressure system, a vertical and parallel coal dust particle size screening baffle 1# and 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 formed in the baffle, the coal dust particle size screening baffle is fixedly connected with the baffle through a clamping groove in the baffle, the coal dust discharge port 1# is located at the bottom of the left end of the coal dust particle size screening baffle 1# and the coal dust discharge port 2# is located 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 residual material outlet is formed in the baffle right opposite to the exhaust port, and a coal dust conveying belt is arranged at the bottom of the baffle.
5. The device for preparing and sealing coal-based composite sealing materials in real time in the drilling process according to claim 4, wherein: the negative pressure extraction pipe is provided with four pipe holes, a negative pressure meter and a flowmeter, and a gauze filter screen is arranged on the exhaust port.
6. The device for preparing and sealing coal-based composite sealing materials in real time in the drilling process according to claim 1, wherein: the coal-based composite material preparation system 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 formed in 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.
7. The device for preparing and sealing coal-based composite sealing materials in real time in the drilling process according to claim 1, wherein: the coal-based composite material hole sealing system comprises a grouting pipeline, wherein the grouting pipeline is located in a drill hole, the tail end of the grouting pipeline is provided with an expansion bag 1# and an expansion bag 2#, a grout outlet 1# is formed in the position, located in the expansion bag 1#, of the grouting pipeline, a grout outlet 2# is formed in the position, located in the expansion bag 2# of the grouting pipeline, a blasting opening is formed in the grouting pipeline between the grout outlet 1# and the grout outlet 2#, a blasting valve is arranged on the blasting opening, the coal-based composite material hole sealing system further comprises a grout return pipe, the grout return pipe penetrates through the expansion bag 1#, the rear end of the grout return pipe is located between the expansion bag 1# and the expansion bag 2#, the pumping sieve pipe is further provided with an extraction sieve pipe, the rear end of the extraction sieve pipe extends out of the expansion bag 2# and is located at the bottom of the drill hole on the right side of the expansion bag, the extraction sieve pipe and the front ends of the grout return pipe are located on the outer sides of the drill hole, the front end of the grouting pipeline is connected with a grout outlet valve at the bottom of a grout generator through a pipeline.
8. The device for preparing and sealing coal-based composite sealing materials in real time in the drilling process according to claim 7, wherein: the grouting pipeline is provided with a grouting valve, the extraction sieve pipe is provided with an extraction sieve pipe valve, and the upper limit of the pressure bearing of the blasting valve is 0.5MPa.
9. The hole sealing method for the coal-based composite hole sealing material to prepare and seal a hole in real time in the drilling process according to any one of claims 1 to 8, characterized by comprising the following steps:
s1, coal dust particles are obtained by a coal dust generation system, the starting and stopping of a drilling machine system are controlled by a drilling machine console, the generated coal dust particles flow to the inner cavity of a drill rod from a coal suction hole, a negative pressure system is started at the same time, and the generated coal dust particles are sucked 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, respectively filtering the coal dust particles with different particle sizes through 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 the coal dust particles with the particle size larger than 3mm from a coal dust discharge port 1#, filtering the coal dust particles with the particle size of 1-3 mm from a coal dust discharge port 2#, and filtering the coal dust particles with the particle size smaller than 1mm from a residual material 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 with cement, emulsion powder and water according to a mass ratio of 0.1:1:0.1:1.2 preparing a coal-based composite hole sealing material;
s4, plugging the 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, firstly injecting an expansion bag 1# and an expansion bag 2# to support the drilled coal layer by adopting a two-plugging one-injecting hole sealing mode, opening a blast valve when the slurry injection pressure reaches 0.5MPa, injecting the coal-based hole sealing material slurry into a plugging area, opening a valve of a pumping screen pipe after the slurry is solidified, and pumping coal layer gas from a gas inlet of the screen pipe.
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| US20100139920A1 (en) * | 2006-11-17 | 2010-06-10 | Akzo Nobel Coatings International B.V. | Dry cement formulation for cementing holes in the earth |
| CN103790546A (en) * | 2014-02-14 | 2014-05-14 | 河南理工大学 | Gas pre-pumping drilled hole coal dust backfill sealing method |
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