CN112196612A - Coal mine inclined large-diameter drill hole sealing and gangue removing method - Google Patents
Coal mine inclined large-diameter drill hole sealing and gangue removing method Download PDFInfo
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- CN112196612A CN112196612A CN202011289071.XA CN202011289071A CN112196612A CN 112196612 A CN112196612 A CN 112196612A CN 202011289071 A CN202011289071 A CN 202011289071A CN 112196612 A CN112196612 A CN 112196612A
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- gangue
- gas extraction
- extraction pipe
- pipe
- drill hole
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
Abstract
A method for sealing holes and removing waste rocks of inclined large-diameter drill holes of coal mines comprises the following steps: inserting the first gas extraction pipe provided with the sealing device into the inclined large-diameter drill hole; starting a sealing device to seal an annular gap between the first gas extraction pipe and the inclined large-diameter drill hole; connecting a gangue removing device between the outlet end of a first gas extraction pipe and the inlet end of a second gas extraction pipe, and connecting the second gas extraction pipe to a gas extraction system under a coal mine; gas extraction is carried out on the inclined large-diameter drill hole, and gangue is temporarily stored in a gangue removing device in the gas extraction process; and after the gangue is stored for a certain height in the gangue removing device, closing the extraction pump, opening the gangue removing device and taking out the gangue. The invention has simple process, simple structure of the adopted device and simple and convenient operation, greatly improves the gas extraction effect and has important popularization value.
Description
Technical Field
The invention relates to the technical field of coal mine gas extraction drilling and sealing, in particular to a method for sealing an inclined large-diameter drilling hole and removing gangue in a coal mine.
Background
The inclined large-diameter drill hole is a new goaf gas extraction technology developed in recent years, as shown in fig. 1 and fig. 2, an air inlet lane 49 and an air return lane 51 are respectively arranged on two sides of a coal face 50, namely, a gas control lane 52 is arranged beside the air return lane 51 at the coal face 50, an inclined large-diameter drill hole 53 is drilled into the air return lane 51 from the gas control lane 52, the inclined large-diameter drill hole 53 replaces a connecting lane of the air return lane 51 to extract upper corner gas, 54 in fig. 2 is a goaf, 55 is a coal pillar, 56 is a coal seam, and 57 is a gas extraction system.
The following documents: the technology for treating upper corner gas in ultra-large diameter drilling holes by replacing the lane with holes (Jiang Lian, Yangbang, Shanxi coking coal technology, 2019: 47-49), the feasibility research of gas extraction technology in small Zhuang mine by replacing the lane with holes (Guo Lin, Lin build, Like, and the like, Chinese coal, 2020, 46(9): 65-70), the research of the technology for treating upper corner gas in ultra-large diameter drilling holes (Wang Kangwang, mining industry safety and environmental protection, 2020, 47 (2): 90-93), the application of the technology for treating upper corner gas in large diameter drilling holes on comprehensive mining working faces (Shiruing, Gao, Lihao, Shanxi coking coal technology, 2018: 31-34), the research of the gas extraction technology in ultra-large diameter drilling hole mining area (Gaowang, Yang Wei, scientific technology, 2019, 47 (2): 77-81), and the application research of the large diameter gas extraction technology in Wanan coal mining area (Wan Lian coal and chemical industry, 2019.42(5): 100-103) etc. describe the use of inclined large diameter boreholes in coal mines.
The hole sealing of the inclined large-diameter drill hole is obviously different from the hole sealing mode of a common drill hole, and is mainly embodied in the following aspects:
(1) the extraction horizons are different. Gas is extracted from the goaf and the upper corner by the inclined large-diameter drill hole, and gas is extracted from the coal bed by the common drill hole.
(2) The drill holes are of different diameters. The diameter of the inclined large-diameter drill hole is generally larger than 350mm, and the diameter of the common drill hole is generally about 100mm and is far larger than the diameter of the common drill hole.
(3) The extraction pipes are different. The inclined large-diameter borehole gas extraction pipe has a large diameter, so that the inclined large-diameter borehole gas extraction pipe requires higher rigidity and can be recycled.
(4) The extraction negative pressure is different. And the permeability of the goaf is far greater than that of the coal seam, so that the extraction negative pressure of the inclined large-diameter drill hole is far less than that of the common drill hole.
Due to the fact that the inclined large-diameter drill hole is large in extraction diameter and gas in the goaf is extracted, broken gangue in the goaf easily enters a gas extraction pipeline to affect gas extraction, and therefore a gangue removal device must be arranged on the inclined large-diameter drill hole extraction pipeline; due to the small extraction negative pressure of the inclined large-diameter drill hole, simpler and recyclable hole sealing materials and shorter hole sealing length can be adopted.
Disclosure of Invention
The invention provides a method for sealing inclined large-diameter drill holes of a coal mine and removing waste rocks, aiming at solving the problems that the inclined large-diameter drill holes are complex to seal and the stones are easy to enter a gas extraction pipeline in the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme: a method for sealing holes and removing waste rocks of inclined large-diameter drill holes of coal mines comprises the following steps,
(1) mounting a sealing device on a first gas extraction pipe;
(2) inserting a first gas extraction pipe into the inclined large-diameter drill hole;
(3) starting a sealing device to seal an annular gap between the first gas extraction pipe and the inclined large-diameter drill hole;
(4) connecting an air inlet port of the gangue removing device with an outlet end of a first gas extraction pipe;
(5) connecting an air outlet port of the gangue removing device with a second gas extraction pipe, and connecting the second gas extraction pipe to a gas extraction system under the coal mine;
(6) starting an extraction pump of a coal mine underground gas extraction system, extracting gas from the inclined large-diameter drill hole, and temporarily storing gangue in a gangue removal device in the gas extraction process;
(7) after the gangue is stored at a certain height in the gangue removing device, closing the extraction pump, opening the gangue removing device and taking out the gangue;
(8) starting an extraction pump, and continuing gas extraction operation;
(9) and (5) repeating the steps (7) and (8) for multiple times until the extraction is finished, and dismantling the first gas extraction pipe, the second gas extraction pipe and the gangue removal device.
The sealing device comprises a cylindrical rubber bag with two permeable ends, an air inlet pipe joint and an air outlet pipe joint are arranged on one end face of the rubber bag, an air inlet check valve is arranged on the air inlet pipe joint, a pressure gauge and an air outlet valve are arranged on the air outlet pipe joint, and an air inflation hose is connected to the outer end of the air inlet pipe joint.
The gangue removing device comprises a gangue removing box in a cuboid shape, the gangue removing box is made of transparent materials, three side faces of the gangue removing box are respectively provided with a first connecting pipe, a second connecting pipe and a gangue discharging port, the first connecting pipe, the first gas extraction pipe, the second connecting pipe and the second gas extraction pipe are connected through flanges, the gangue discharging port is arranged at the lower part of the gangue removing box, one side of the gangue removing box at the gangue discharging port is hinged with a box door through a hinge, a bolt lock is arranged between the other side of the gangue discharging port and the box door of the gangue removing box, a magnet used for adsorbing the box door is embedded in the position adjacent to the bolt lock in the box wall of the gangue removing box, and sealing strips in compression joint with the box door are arranged on the periphery of the inner wall of the gangue removing box.
The inner wall of the box door is connected with a filter screen at the inlet end of the second connecting pipe through a screw, and the mesh size of the filter screen is 20mm multiplied by 20 mm.
In the step (1), the step of installing the sealing device on the first gas extraction pipe is to sleeve the center hole of the rubber bag on the first gas extraction pipe, and the installation position of the rubber bag on the first gas extraction pipe is a position 1m away from the extraction pipe opening.
And (3) inserting the first gas extraction pipe into the inclined large-diameter drill hole by the length of 1.5-1.6m in the step (2).
And (3) connecting an inflator pump with an inflation hose, starting the inflator pump, inflating the rubber air bag by the inflator pump, expanding the rubber air bag, closing the inflator pump when the reading of the pressure gauge is 0.3MPa, and respectively crimping the outer circle and the inner circle of the rubber air bag with the hole wall of the inclined large-diameter drill hole and the inner wall of the first gas extraction pipe, thereby realizing the sealing of the annular gap.
In the step (6), in the gas extraction process, under the action of negative pressure, the gangue is pumped into the gangue removal box through the first gas extraction pipe, the gangue falls into the gangue removal box, and the gangue larger than 20mm multiplied by 20mm cannot be pumped away from the second gas extraction pipe along with the gas under the blocking of the filter screen.
In the step (7), through observing the height of the transparent gangue in the gangue removal box, if the height of the gangue is higher, the extraction of gas is influenced, the box door is opened, the gangue is taken out, and the specific process is as follows: the extraction pump is closed, the bolt lock is opened, the box door is pulled to overcome the adsorption force of the magnet, the gangue in the gangue removal box is taken out after the box door is opened, then the box door is closed, and the bolt lock is closed.
The specific process of removing the first gas extraction pipe, the second gas extraction pipe and the gangue removal device in the step (9) is as follows: firstly, opening a box door to take away gangue in a gangue removal box; removing a connecting bolt between the first connecting pipe and the first gas extraction pipe; removing the connecting bolt between the second connecting pipe and the second gas extraction pipe; and opening an air valve, beginning air bleeding, after air bleeding is finished, drawing the first extraction pipe out of the inclined large-diameter drill hole, and finally taking down the rubber bag from the first gas extraction pipe.
According to the technical scheme, the hole is sealed between the outer circle of the first gas extraction pipe and the inner wall of the inclined large-diameter drill hole, the gangue removing device is arranged between the first gas extraction pipe and the second gas extraction pipe, the extracted gangue enters the gangue removing box in the gas extraction process, the first-stage gravity inertia gangue removal is firstly carried out, and then the second-stage gangue removal is carried out under the blocking of the filter screen. The invention utilizes the characteristic of the inclined large-diameter drill hole, adopts the sealing ring to seal the hole, and the hole sealing equipment can be repeatedly utilized; the waste rock is comprehensively and effectively intercepted, and the problem that the waste rock easily enters an extraction pipeline is solved. The method has the advantages of simple process, simple structure of the adopted device, simple and convenient operation, greatly improved gas extraction effect and important popularization value.
Drawings
FIG. 1 is a schematic plan layout view of a coal mine underground inclined large-diameter borehole;
3 FIG. 3 2 3 is 3 a 3 schematic 3 sectional 3 view 3 taken 3 along 3 line 3 A 3- 3 A 3 in 3 FIG. 31 3; 3
FIG. 3 is a schematic structural diagram of a sealing device and a gangue removing device in the invention;
FIG. 4 is a schematic perspective view of the sealing device of FIG. 3;
FIG. 5 is a schematic perspective view of the gangue removing device in FIG. 3
Fig. 6 is a schematic view of a filter screen.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1-6, the method for sealing the inclined large-diameter drill hole and removing gangue in the coal mine comprises the following steps:
(1) mounting the sealing device 1 on a first gas extraction pipe 2;
(2) inserting the first gas extraction pipe 2 into the inclined large-diameter borehole 53;
(3) starting the sealing device 1 to seal the annular gap between the first gas extraction pipe 2 and the inclined large-diameter drill hole 53;
(4) connecting an air inlet port of the gangue removing device with an outlet end of the first gas extraction pipe 2;
(5) connecting an air outlet port of the gangue removing device with a second gas extraction pipe 3, and connecting the second gas extraction pipe 3 to a coal mine underground gas extraction system 57;
(6) starting an extraction pump of a coal mine underground gas extraction system 57, extracting gas from the inclined large-diameter drill hole 53, and temporarily storing gangue in a gangue removal device in the gas extraction process;
(7) after the gangue is stored at a certain height in the gangue removing device, closing the extraction pump, opening the gangue removing device and taking out the gangue;
(8) starting an extraction pump, and continuing gas extraction operation;
(9) and (5) repeating the steps (7) and (8) for multiple times until the extraction is finished, and dismantling the first gas extraction pipe 2, the second gas extraction pipe 3 and the gangue removal device.
The sealing device 1 comprises a cylindrical rubber bag 8 with two through ends, an air inlet pipe joint 9 and an air outlet pipe joint 10 are arranged on one end face of the rubber bag 8, an air inlet check valve 11 is arranged on the air inlet pipe joint 9, a pressure gauge 12 and an air outlet valve 13 are arranged on the air outlet pipe joint 10, and an inflating hose is connected to the outer end of the air inlet pipe joint 9.
The gangue removing device comprises a gangue removing box 15 in a cuboid shape, the gangue removing box 15 is made of transparent materials, three side faces of the gangue removing box 15 are respectively provided with a first connecting pipe 16, a second connecting pipe 17 and a gangue discharging port, the first connecting pipe 16 is connected with a first gas extraction pipe 2 and the second connecting pipe 17 is connected with a second gas extraction pipe 3 through flanges, the gangue discharging port is arranged at the lower part of the gangue removing box 15, one side of the gangue removing box 15 at the gangue discharging port is hinged with a box door 18 through a hinge, a bolt lock 19 is arranged between the other side of the gangue discharging port and the box door 18 of the gangue removing box 15, a magnet 20 used for adsorbing the box door 18 is embedded in the position adjacent to the bolt lock 19 in the box wall of the gangue removing box 15, and a sealing strip 21 which is in pressure welding with the box door 18 is arranged on the periphery of the inner wall of the box door 18.
The inner wall of the box door 18 is connected with a filter screen 22 at the inlet end of the second connecting pipe 17 through a screw, and the mesh size of the filter screen 22 is 20mm multiplied by 20 mm.
In the step (1), the sealing device 1 is installed on the first gas extraction pipe 2 by sleeving a central hole of the rubber bag 8 on the first gas extraction pipe 2, and the installation position of the rubber bag 8 on the first gas extraction pipe 2 is a position 1m away from the extraction pipe opening.
In the step (2), the length of the first gas extraction pipe 2 inserted into the inclined large-diameter borehole 53 is 1.5-1.6 m.
And (3) connecting an inflator pump with an inflation hose, starting the inflator pump, inflating the rubber air bag by the inflator pump, expanding the rubber air bag, turning off the inflator pump when the reading of the pressure gauge 12 is 0.3MPa, and respectively crimping the outer circle and the inner circle of the rubber air bag with the hole wall of the inclined large-diameter drill hole 53 and the inner wall of the first gas extraction pipe 2, thereby sealing the annular gap.
In the step (6), in the gas extraction process, under the action of negative pressure, the gangue is pumped into the gangue removal box 15 through the first gas extraction pipe 2, the gangue falls into the gangue removal box 15, and the gangue larger than 20mm × 20mm cannot be pumped away from the second gas extraction pipe 3 along with the gas under the blocking of the filter screen 22.
In the step (7), by observing the height of the transparent gangue in the gangue removing box 15, if the height of the gangue is higher, the extraction of gas is affected, the box door 18 is opened, the gangue is taken out, and the specific process is as follows: firstly, the extraction pump is closed, the latch lock 19 is opened, the box door 18 is pulled to overcome the adsorption force of the magnet 20, the gangue in the gangue removal box 15 is taken out after the box door 18 is opened, then the box door 18 is closed, and the latch lock 19 is closed.
The specific process of removing the first gas extraction pipe 2, the second gas extraction pipe 3 and the gangue removal device in the step (9) is as follows: firstly, opening the box door 18 to take away the gangue in the gangue removing box 15; dismantling the connecting bolt between the first connecting pipe 16 and the first gas extraction pipe 2; dismantling the connecting bolt between the second connecting pipe 17 and the second gas extraction pipe 3; and opening a deflation valve 13, beginning deflation, after deflation is finished, drawing the first extraction pipe out of the inclined large-diameter drill hole 53, and finally taking the rubber bag 8 down from the first gas extraction pipe.
The present embodiment is not intended to limit the shape, material, structure, etc. of the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
Claims (10)
1. A method for sealing holes and removing waste rocks of inclined large-diameter drill holes of coal mines is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
(1) mounting a sealing device on a first gas extraction pipe;
(2) inserting a first gas extraction pipe into the inclined large-diameter drill hole;
(3) starting a sealing device to seal an annular gap between the first gas extraction pipe and the inclined large-diameter drill hole;
(4) connecting an air inlet port of the gangue removing device with an outlet end of a first gas extraction pipe;
(5) connecting an air outlet port of the gangue removing device with a second gas extraction pipe, and connecting the second gas extraction pipe to a gas extraction system under the coal mine;
(6) starting an extraction pump of a coal mine underground gas extraction system, extracting gas from the inclined large-diameter drill hole, and temporarily storing gangue in a gangue removal device in the gas extraction process;
(7) after the gangue is stored at a certain height in the gangue removing device, closing the extraction pump, opening the gangue removing device and taking out the gangue;
(8) starting an extraction pump, and continuing gas extraction operation;
(9) and (5) repeating the steps (7) and (8) for multiple times until the extraction is finished, and dismantling the first gas extraction pipe, the second gas extraction pipe and the gangue removal device.
2. The method for sealing the inclined large-diameter drill hole and removing the gangue in the coal mine according to claim 1, wherein the method comprises the following steps: the sealing device comprises a cylindrical rubber bag with two permeable ends, an air inlet pipe joint and an air outlet pipe joint are arranged on one end face of the rubber bag, an air inlet check valve is arranged on the air inlet pipe joint, a pressure gauge and an air outlet valve are arranged on the air outlet pipe joint, and an air inflation hose is connected to the outer end of the air inlet pipe joint.
3. The method for sealing the inclined large-diameter drill hole and removing the gangue in the coal mine according to claim 2, wherein the method comprises the following steps: the gangue removing device comprises a gangue removing box in a cuboid shape, the gangue removing box is made of transparent materials, three side faces of the gangue removing box are respectively provided with a first connecting pipe, a second connecting pipe and a gangue discharging port, the first connecting pipe, the first gas extraction pipe, the second connecting pipe and the second gas extraction pipe are connected through flanges, the gangue discharging port is arranged at the lower part of the gangue removing box, one side of the gangue removing box at the gangue discharging port is hinged with a box door through a hinge, a bolt lock is arranged between the other side of the gangue discharging port and the box door of the gangue removing box, a magnet used for adsorbing the box door is embedded in the position adjacent to the bolt lock in the box wall of the gangue removing box, and sealing strips in compression joint with the box door are arranged on the periphery of the inner wall of the gangue removing box.
4. The method for sealing and removing the gangue in the inclined large-diameter drill hole of the coal mine according to claim 3, wherein the method comprises the following steps: the inner wall of the box door is connected with a filter screen at the inlet end of the second connecting pipe through a screw, and the mesh size of the filter screen is 20mm multiplied by 20 mm.
5. The method for sealing the inclined large-diameter drill hole and removing the gangue in the coal mine according to claim 4, wherein the method comprises the following steps: in the step (1), the step of installing the sealing device on the first gas extraction pipe is to sleeve the center hole of the rubber bag on the first gas extraction pipe, and the installation position of the rubber bag on the first gas extraction pipe is a position 1m away from the extraction pipe opening.
6. The method for sealing the inclined large-diameter drill hole and removing the gangue in the coal mine according to claim 4, wherein the method comprises the following steps: and (3) inserting the first gas extraction pipe into the inclined large-diameter drill hole by the length of 1.5-1.6m in the step (2).
7. The method for sealing the inclined large-diameter drill hole and removing the gangue in the coal mine according to claim 4, wherein the method comprises the following steps: and (3) connecting an inflator pump with an inflation hose, starting the inflator pump, inflating the rubber air bag by the inflator pump, expanding the rubber air bag, closing the inflator pump when the reading of the pressure gauge is 0.3MPa, and respectively crimping the outer circle and the inner circle of the rubber air bag with the hole wall of the inclined large-diameter drill hole and the inner wall of the first gas extraction pipe, thereby realizing the sealing of the annular gap.
8. The method for sealing the inclined large-diameter drill hole and removing the gangue in the coal mine according to claim 4, wherein the method comprises the following steps: in the step (6), in the gas extraction process, under the action of negative pressure, the gangue is pumped into the gangue removal box through the first gas extraction pipe, the gangue falls into the gangue removal box, and the gangue larger than 20mm multiplied by 20mm cannot be pumped away from the second gas extraction pipe along with the gas under the blocking of the filter screen.
9. The method for sealing the inclined large-diameter drill hole and removing the gangue in the coal mine according to claim 4, wherein the method comprises the following steps: in the step (7), through observing the height of the transparent gangue in the gangue removal box, if the height of the gangue is higher, the extraction of gas is influenced, the box door is opened, the gangue is taken out, and the specific process is as follows: the extraction pump is closed, the bolt lock is opened, the box door is pulled to overcome the adsorption force of the magnet, the gangue in the gangue removal box is taken out after the box door is opened, then the box door is closed, and the bolt lock is closed.
10. The method for sealing the inclined large-diameter drill hole and removing the gangue in the coal mine according to claim 4, wherein the method comprises the following steps: the specific process of removing the first gas extraction pipe, the second gas extraction pipe and the gangue removal device in the step (9) is as follows: firstly, opening a box door to take away gangue in a gangue removal box; removing a connecting bolt between the first connecting pipe and the first gas extraction pipe; removing the connecting bolt between the second connecting pipe and the second gas extraction pipe; and opening an air valve, beginning air bleeding, after air bleeding is finished, drawing the first extraction pipe out of the inclined large-diameter drill hole, and finally taking down the rubber bag from the first gas extraction pipe.
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| CN202011289071.XA CN112196612B (en) | 2020-11-17 | 2020-11-17 | Coal mine inclined large-diameter drill hole sealing and gangue removing method |
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| CN112196612B (en) | 2022-07-29 |
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