CN108561176B - Automatic blocking and permeability-increasing device and method for gas extraction drilling - Google Patents
Automatic blocking and permeability-increasing device and method for gas extraction drilling Download PDFInfo
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- CN108561176B CN108561176B CN201810286216.7A CN201810286216A CN108561176B CN 108561176 B CN108561176 B CN 108561176B CN 201810286216 A CN201810286216 A CN 201810286216A CN 108561176 B CN108561176 B CN 108561176B
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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
Abstract
The automatic dredging and permeability-increasing device for the gas extraction drill hole comprises an extraction pipeline, an air supply pipeline, an adjusting pipeline, a pressure control pneumatic valve and a pressurizing pipeline, wherein the extraction pipeline comprises an in-hole extraction pipe and an exhaust pipe, and the exhaust pipe is provided with a first pneumatic valve; the air supply pipeline is sequentially provided with a first stop valve, a second pneumatic valve and a first one-way valve, and the first one-way valve is connected with the in-hole extraction pipe; the two ends of the adjusting pipeline are respectively connected with the first stop valve and the first pneumatic valve, the adjusting pipeline is sequentially provided with a second stop valve and a third pneumatic valve, the third pneumatic valve is positioned at the tail end of the adjusting pipeline, the opening control pipeline and the closing control pipeline of the first pneumatic valve are respectively connected with the third pneumatic valve, and the opening control pipeline and the closing control pipeline of the second pneumatic valve are respectively connected with the closing control pipeline and the opening control pipeline of the first pneumatic valve; the two ends of the pressurizing pipeline are respectively connected with the adjusting pipeline and the air supply pipeline.
Description
Technical Field
The invention relates to the field of gas extraction, in particular to blocking dredging and permeability increasing of coal mine underground coal seam gas extraction drilling holes.
Background
Coal bed gas extraction is an important technical means for preventing and controlling mine gas accidents and ensuring mine safety production, and is widely applied to outburst mines and high-gas mines. The gas extraction is also an important measure for acquiring clean energy, increasing energy supply and reducing environmental pollution. The significance of improving the gas extraction effect is great.
Most of mining areas in China have low coal seam air permeability, and belong to coal seams difficult to extract and coal seams difficult to extract, after the construction of extraction drilling holes, the gas flow rate and the gas concentration of the extraction drilling holes are fast attenuated, and the gas extraction effect is poor. In order to improve the gas extraction effect of the low-permeability coal seam, expert students develop various technical means for improving the gas permeability and extraction effect of the coal seam, and the technical means can be summarized into two main types, namely, pressurizing and permeability-increasing measures, such as hydraulic fracturing, carbon dioxide phase-change fracturing blasting, deep hole presplitting blasting and the like, and the coal body is damaged under the action of high energy and high stress to construct a fracture channel so as to improve the gas permeability of the coal seam; the second category is pressure relief and permeability improvement measures, such as hydraulic slotting, hydraulic punching and the like, and the ground stress is reduced and the coal bed permeability is improved by stripping and reaming the coal body around the extraction drilling hole. These measures are applied in different mines, respectively.
The field application experience shows that the measures have large engineering quantity and high cost, after the anti-reflection measures are adopted, the effect of improving the gas flow and the gas concentration in the initial stage of the operation of the extraction drilling hole is obvious, but the problem that the gas flow and the gas concentration are not attenuated is still avoided due to the plugging of the gas flow channel when the extraction drilling hole is operated to the later stage, and the function of the extraction drilling hole cannot fully play a role.
Aiming at the problems of gas flow, gas concentration attenuation and the like in low-permeability coal beds and later operation of extraction holes, the invention aims to provide an automatic blocking and permeability increasing method and device for coal bed gas extraction holes according to a decompression damage mechanism of a gas-containing porous medium.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an automatic blocking and permeability-increasing device and method for gas extraction drilling, which can dredge a gas fracture channel, increase the gas permeability of a coal body and improve the gas extraction effect.
In order to achieve the above purpose, the invention adopts the following technical scheme: the automatic dredging and permeability-increasing device for the gas extraction drill hole comprises an extraction pipeline, an air supply pipeline, an adjusting pipeline, a pressure control pneumatic valve and a pressurizing pipeline, wherein the extraction pipeline comprises an in-hole extraction pipe and an exhaust pipe, and the exhaust pipe is provided with a first pneumatic valve; the air supply pipeline is sequentially provided with a first stop valve, a second pneumatic valve and a first one-way valve, and the first one-way valve is connected with the in-hole extraction pipe; the two ends of the adjusting pipeline are respectively connected with the first stop valve and the first pneumatic valve, the adjusting pipeline is sequentially provided with a second stop valve and a third pneumatic valve, the third pneumatic valve is positioned at the tail end of the adjusting pipeline, the opening control pipeline and the closing control pipeline of the first pneumatic valve are respectively connected with the third pneumatic valve, and the opening control pipeline and the closing control pipeline of the second pneumatic valve are respectively connected with the closing control pipeline and the opening control pipeline of the first pneumatic valve; the two ends of the pressurizing pipeline are respectively connected with the adjusting pipeline and the air supply pipeline, the connection point of the pressurizing pipeline and the adjusting pipeline is positioned between the second stop valve and the first stop valve, the connection point of the pressurizing pipeline and the air supply pipeline is positioned between the first one-way valve and the in-hole extraction pipe, the connection point of the pressurizing pipeline and the air supply pipeline is connected with the third pneumatic valve, the pressurizing pipeline is sequentially provided with a pressurizing pump, an air storage tank and a fourth pneumatic ball valve, the opening control pipeline and the closing control pipeline of the fourth pneumatic ball valve are respectively connected with the pressure control pneumatic valve, the pressure control pneumatic valve is connected with the closing control pipeline of the first pneumatic valve through the first connecting pipeline, the pressure control pneumatic valve is connected with the pressurizing pipeline through the second connecting pipeline, and the connection point of the second connecting pipeline and the pressurizing pipeline is positioned between the air storage tank and the fourth pneumatic ball valve; the second stop valve is connected with a closing control pipeline of the second pneumatic valve and a closing control pipeline of the fourth pneumatic ball valve through a third connecting pipeline, a third one-way valve is arranged on the third connecting pipeline, and the third one-way valve is positioned between a connecting point of the third connecting pipeline and the closing control pipeline of the second pneumatic valve and a connecting point of the third connecting pipeline and the closing control pipeline of the fourth pneumatic ball valve; when the third pneumatic valve is closed, the adjusting pipeline is communicated with the closing control pipeline of the first pneumatic valve and the opening control pipeline of the second pneumatic valve, and when the third pneumatic valve is opened, the adjusting pipeline is communicated with the opening control pipeline of the first pneumatic valve and the closing control pipeline of the second pneumatic valve, and the third pneumatic valve is in a normally closed state; when the second stop valve is opened, the second stop valve is communicated with the third pneumatic valve, and when the second stop valve is closed, the second stop valve is communicated with an opening control pipeline of the first pneumatic valve and a closing control pipeline of the second pneumatic valve, and the second stop valve is in a normally open state; when the pressure control pneumatic valve is in a closed state, the closing control pipeline of the first pneumatic valve and the closing control pipeline of the fourth pneumatic ball valve form a passage, and when the pressure control pneumatic valve is opened, the closing control pipeline of the first pneumatic valve and the opening control pipeline of the fourth pneumatic ball valve form a passage, and the pressure control pneumatic valve is in a normally closed state.
And the in-hole extraction pipe is connected with the exhaust pipe through a quick connector.
The exhaust pipe is provided with a first pressure gauge.
The adjusting pipeline is provided with a filtering and pressure-adjusting oil mist device combination mechanism, and the filtering and pressure-adjusting oil mist device combination mechanism is positioned between the first stop valve and the booster pump.
The first pneumatic valve is a pneumatic butterfly stop valve, the first stop valve is a manual spherical stop valve, the second pneumatic valve is a pneumatic two-position two-way valve, the third pneumatic valve is a pneumatic two-position five-way valve, the second stop valve is a manual two-position five-way valve, and the pneumatic control valve is a pneumatic two-position five-way valve.
And a second pressure gauge is arranged on the pressurizing pipeline.
The pressure relief valve is arranged on the pressure boost pipeline and is a manual stop valve.
The automatic blocking and permeability increasing method for the gas extraction drilling hole is characterized by comprising the following steps of:
(1) Connecting the front end of an air supply pipeline with an underground air pressing device, opening a first stop valve, enabling one part of gas to enter an adjusting pipeline, and enabling the other part of gas to enter a pressurizing pipeline;
(2) The gas entering the regulating pipeline triggers the third pneumatic valve, the regulating pipeline is communicated with the closing control pipeline of the first pneumatic valve and the opening control pipeline of the second pneumatic valve, so that the first pneumatic valve is closed, and the second pneumatic valve is opened;
(3) After the second pneumatic valve is opened, air exhausted by the underground air pressing device enters the inner extraction pipe through the air supply pipeline;
(4) The booster pump conveys the gas in the booster pipeline to the gas storage tank for continuous pressurization, the gas storage tank, the pressure control pneumatic valve and the closing control pipeline of the fourth pneumatic ball valve form a passage, and the fourth pneumatic ball valve is in a closed state;
(5) When the gas pressure value in the gas storage tank is larger than the action pressure value of the pressure control pneumatic valve, the pressure control pneumatic valve is opened, a closing control pipeline of the first pneumatic valve and an opening control pipeline of the fourth pneumatic ball valve form a passage, the fourth pneumatic ball valve is in an opened state, a pressurizing pipeline and the in-hole extraction pipe form a passage, and high-pressure gas in the gas storage tank is discharged into the in-hole extraction pipe;
(6) When the pressure value of the gas in the gas storage tank is smaller than the action pressure value of the pressure control pneumatic valve through releasing, the pressure control pneumatic valve is closed, a closing control pipeline of the first pneumatic valve and a closing control pipeline of the fourth pneumatic ball valve form a passage, the fourth pneumatic ball valve is in a closing state, and the booster pump conveys the gas in the booster pipeline into the gas storage tank and continuously pressurizes the gas;
(7) Repeating the steps (4) to (6), when the gas pressure value in the extraction pipe in the hole reaches the action pressure value of the third pneumatic valve, the adjusting pipeline is communicated with the opening control pipeline of the first pneumatic valve and the closing control pipeline of the second pneumatic valve, so that the first pneumatic valve is opened, the second pneumatic valve is closed, and the gas in the extraction pipe in the hole is rapidly discharged from the exhaust pipe;
(8) When the gas pressure value in the extraction pipe in the hole is lower than the action pressure value of the third pneumatic valve, the third pneumatic valve is reset, and the adjusting pipeline is communicated with the closing control pipeline of the first pneumatic valve and the opening control pipeline of the second pneumatic valve, so that the first pneumatic valve is closed, and the second pneumatic valve is opened;
(9) Repeating the steps (2) to (8) for a plurality of times until no coal dust in the extraction pipe in the hole is discharged from the exhaust pipe;
(10) And the second stop valve is manually adjusted, the underground air pressing device is communicated with an opening control pipeline of the first pneumatic valve and a closing control pipeline of the second pneumatic valve, so that the first pneumatic valve is opened, the second pneumatic valve is closed, gas in the hole extraction pipe is discharged from the exhaust pipe to release pressure, and finally the first stop valve is closed.
The action pressure value of the pressure control pneumatic valve is 1.6MPa.
The action pressure value of the third pneumatic valve is 0.6 MPa.
The invention conveys high-pressure gas to the in-hole extraction pipe when the gas storage tank is depressurized, the high-pressure gas is sprayed into the gas extraction hole from the in-hole extraction pipe, and the blockage (a first isolation screen) fixedly connected to the gas collecting section of the extraction drilling extraction pipe is impacted and broken; the adjusting pipeline and the pressure control pneumatic valve control intermittent pressure relief of high-pressure gas in the gas storage tank through pressure change in the gas storage tank, so that the blockage (a first isolation screen) of the gas collection section of the extraction drilling hole is subjected to multiple impact crushing, the first pneumatic valve is opened after the gas in the extraction pipe in the hole reaches a certain pressure value, the high-pressure gas in the extraction drilling hole is suddenly relieved due to sudden opening of the first pneumatic valve, the blockage of the gas collection section of the extraction drilling hole is subjected to tearing crushing (the first isolation screen) and scouring and moving of pulverized coal (a second isolation screen) in a crack near the side wall of the extraction drilling hole, meanwhile, the crushed pulverized coal and the pulverized coal in the crack are flushed out of the drilling hole during pressure relief of the high-pressure gas, a repeatedly-acting pressurizing-discharging pneumatic force field is established in the extraction drilling hole, and finally gas crack channels are dredged, and gas permeability is increased.
Drawings
FIG. 1 is a schematic diagram of a coal seam gas drainage borehole gas flow screen according to the present invention;
FIG. 2 is a schematic diagram of the structure of the present invention;
fig. 3 is a schematic diagram of the working principle of the present invention.
Detailed Description
As shown in fig. 1 to 3, an automatic dredging and anti-reflection device for gas extraction drilling holes comprises an extraction pipeline, an air supply pipeline, an adjusting pipeline, a pressure control pneumatic valve 1 and a pressurizing pipeline, wherein the extraction pipeline comprises an in-hole extraction pipe 2 and an exhaust pipe 3, and the exhaust pipe 3 is provided with a first pneumatic valve 4; the air supply pipeline is sequentially provided with a first stop valve 5, a second pneumatic valve 6 and a first one-way valve 7, and the first one-way valve 7 is connected with the in-hole extraction pipe 2; the two ends of the adjusting pipeline are respectively connected with the first stop valve 5 and the first pneumatic valve 4, the adjusting pipeline is sequentially provided with a second stop valve 8 and a third pneumatic valve 9, the third pneumatic valve 9 is positioned at the tail end of the adjusting pipeline, an opening control pipeline 10 and a closing control pipeline 11 of the first pneumatic valve 4 are respectively connected with the third pneumatic valve 9, and an opening control pipeline 12 and a closing control pipeline 13 of the second pneumatic valve 6 are respectively connected with a closing control pipeline 11 of the first pneumatic valve 4 and an opening control pipeline 10 of the first pneumatic valve 4; the two ends of the pressurizing pipeline are respectively connected with the adjusting pipeline and the air supply pipeline, the connection point of the pressurizing pipeline and the adjusting pipeline is positioned between the second stop valve 8 and the first stop valve 5, the connection point of the pressurizing pipeline and the air supply pipeline is positioned between the first one-way valve 7 and the in-hole extraction pipe 2, the connection point of the pressurizing pipeline and the air supply pipeline is connected with the third pneumatic valve 9, the pressurizing pipeline is sequentially provided with a pressurizing pump 14, an air storage tank 15 and a fourth pneumatic ball valve 16, the opening control pipeline 17 and the closing control pipeline 18 of the fourth pneumatic ball valve 16 are respectively connected with the pressure control pneumatic valve 1, the pressure control pneumatic valve 1 is connected with the closing control pipeline 11 of the first pneumatic valve 4 through the first connection pipeline 19, the first connection pipeline 19 is provided with the second one-way valve 20, the pressure control pneumatic valve 1 is connected with the pressurizing pipeline through the second connection pipeline 21, and the connection point of the second connection pipeline 21 and the pressurizing pipeline is positioned between the air storage tank 15 and the fourth pneumatic ball valve 16; the second stop valve 8 is connected with the closing control pipeline 13 of the second pneumatic valve 6 and the closing control pipeline 18 of the fourth pneumatic ball valve 16 through a third connecting pipeline 22, a third one-way valve 23 is arranged on the third connecting pipeline 22, the third one-way valve 23 is positioned between the connecting point of the third connecting pipeline 22 and the closing control pipeline 13 and the connecting point of the third connecting pipeline 22 and the closing control pipeline 18, when the third pneumatic valve 9 is closed, the adjusting pipeline is communicated with the closing control pipeline 11 of the first pneumatic valve 4 and the opening control pipeline 12 of the second pneumatic valve 6, and when the third pneumatic valve 9 is opened, the adjusting pipeline is communicated with the opening control pipeline 10 of the first pneumatic valve 4 and the closing control pipeline 13 of the second pneumatic valve 6, and the third pneumatic valve 9 is in a normally closed state; when the second stop valve 8 is opened, the second stop valve 8 is communicated with the third pneumatic valve 9, and when the second stop valve 8 is closed, the second stop valve 8 is communicated with the opening control pipeline 10 of the first pneumatic valve 4 and the closing control pipeline 13 of the second pneumatic valve 6, and the second stop valve 8 is in a normally open state; when the pressure control pneumatic valve 1 is in a closed state, the closing control pipeline 11 of the first pneumatic valve 4 and the closing control pipeline 18 of the fourth pneumatic ball valve 16 form a passage, and when the pressure control pneumatic valve 1 is opened, the closing control pipeline 11 of the first pneumatic valve 4 and the opening control pipeline 17 of the fourth pneumatic ball valve 16 form a passage, and the pressure control pneumatic valve 1 is in a normally closed state.
The in-hole extraction pipe 2 and the exhaust pipe 3 are connected through the quick connector 24, so that the in-hole extraction pipe 2 and the exhaust pipe 3 are conveniently connected, and the working efficiency is improved. The exhaust pipe 3 is provided with a first pressure gauge 25.
The regulation pipeline is provided with a filtering and pressure regulating oil sprayer combined mechanism 26, the filtering and pressure regulating oil sprayer combined mechanism 26 is positioned between the first stop valve 5 and the booster pump 14, the filtering and pressure regulating oil sprayer combined mechanism 26 is in the prior art, and can filter gas exhausted by the underground air pressure device.
The first pneumatic valve 4 is a pneumatic butterfly stop valve, the first stop valve 5 is a manual spherical stop valve, the second pneumatic valve 6 is a pneumatic two-position two-way valve, the third pneumatic valve 9 is a pneumatic two-position five-way valve, the second stop valve 8 is a manual two-position five-way valve, and the pressure control pneumatic valve 1 is a pneumatic two-position five-way valve.
A second pressure gauge 27 is provided on the pressure increasing pipe. The pressure relief valve 28 is arranged on the pressure boosting pipeline, the pressure relief valve 28 is a manual stop valve, and high-pressure gas in the gas storage tank 15 can be discharged through the pressure relief valve 28 after the device stops working.
The automatic blocking and permeability increasing method for the gas extraction drilling hole is characterized by comprising the following steps of:
(1) Connecting the front end of an air supply pipeline with an underground air pressing device, opening a first stop valve 5, wherein one part of gas enters an adjusting pipeline, and the other part of gas enters a pressurizing pipeline;
(2) The gas entering the regulating pipeline triggers the third pneumatic valve 9, and the regulating pipeline is communicated with the closing control pipeline 11 of the first pneumatic valve 4 and the opening control pipeline 12 of the second pneumatic valve 6, so that the first pneumatic valve 4 is closed and the second pneumatic valve 6 is opened;
(3) After the second pneumatic valve 6 is opened, air exhausted by the underground air pressing device enters the in-hole extraction pipe 2 through an air supply pipeline, the air pressure value in the in-hole extraction pipe 2 is increased, and the first one-way valve 7 prevents the air in the in-hole extraction pipe 2 from flowing back;
(4) The booster pump 14 conveys the gas in the booster pipeline to the gas storage tank 15 for continuous pressurization, the gas storage tank 15, the pressure control pneumatic valve 1 and the closing control pipeline 18 of the fourth pneumatic ball valve 16 form a passage, and the fourth pneumatic ball valve 16 is in a closed state;
(5) When the gas pressure value in the gas storage tank 15 is larger than the action pressure value of the gas control pneumatic valve 1, the gas control pneumatic valve 1 is opened, a closed control pipeline 11 of the first pneumatic valve 4 and an open control pipeline 17 of the fourth pneumatic ball valve 16 form a passage, the fourth pneumatic ball valve 16 is in an opened state, a pressurizing pipeline and the in-hole extraction pipe 2 form a passage, high-pressure gas in the gas storage tank 15 enters the in-hole extraction pipe 2, high-pressure gas in the in-hole extraction pipe 2 is injected into an extraction drill hole, and impact crushing is carried out on a blockage (a first isolation screen 30) fixedly connected to the gas collecting section of the extraction drill hole extraction pipe;
(6) When the pressure value of the gas in the gas storage tank 15 is smaller than the action pressure value of the pressure control pneumatic valve 1 through releasing, the pressure control pneumatic valve 1 is closed, a closing control pipeline 11 of the first pneumatic valve 4 and a closing control pipeline 18 of the fourth pneumatic ball valve 16 form a passage, the fourth pneumatic ball valve 16 is in a closing state, and the booster pump 14 conveys the gas in the booster pipeline into the gas storage tank 15 and continuously pressurizes the gas;
(7) Repeating the steps (4) to (6), when the gas pressure value in the in-hole extraction pipe 2 reaches the action pressure value of the third pneumatic valve 9, the adjusting pipeline is communicated with the opening control pipeline 10 of the first pneumatic valve 4 and the closing control pipeline 13 of the second pneumatic valve 6, so that the first pneumatic valve 4 is opened, the second pneumatic valve 6 is closed, high-pressure gas in the in-hole extraction pipe 2 is rapidly discharged from the exhaust pipe 3, the high-pressure gas in the in-hole extraction pipe 2 tears and breaks a blockage of a gas collecting section of the extraction drilling extraction pipe (a first isolation screen 30) and flushes and moves pulverized coal in a crack (a second isolation screen 31) near the edge wall of the extraction drilling hole, and meanwhile, the broken pulverized coal and the pulverized coal in the crack are flushed out of the drilling hole when the high-pressure gas is released;
(8) When the gas pressure value in the in-hole extraction pipe 2 is lower than the action pressure value of the third pneumatic valve 9, the third pneumatic valve 9 is reset, and the adjusting pipeline is communicated with the closing control pipeline 11 of the first pneumatic valve 4 and the opening control pipeline 12 of the second pneumatic valve 6, so that the first pneumatic valve 4 is closed, and the second pneumatic valve 6 is opened;
(9) Repeating the steps (2) to (8) for a plurality of times until no coal dust in the in-hole extraction pipe 2 is discharged from the exhaust pipe 3;
(10) The second stop valve 8 is manually opened, the underground air pressing device is communicated with the opening control pipeline 10 of the first pneumatic valve 4 and the closing control pipeline 13 of the second pneumatic valve 6, so that the first pneumatic valve 4 is opened, the second pneumatic valve 6 is closed, the gas in the extraction pipe 2 in the hole is discharged from the exhaust pipe 3 for pressure relief, and finally the first stop valve 5 is closed.
Before the device starts working, no person stays and passes through the extraction drilling hole within 2 meters to prevent the joint from collapsing and damaging the person, in addition, the exhaust port of the exhaust pipe 3 faces the unmanned place of the side wall of the roadway 33 to prevent the ejected high-pressure gas and pulverized coal slag from damaging the person, the pressurizing-pressure releasing cycle process is generally carried out on each extraction hole for 5 to 10 times, no pulverized coal in the in-hole extraction pipe 2 is discharged from the exhaust pipe 3, the operation can be stopped, the exhaust pipe 3 adopts a metal hose, the action pressure value of the pressure control pneumatic valve 1 is 1.6MPa, when the pressure in the air storage tank 15 is larger than 1.6MPa, the action pressure value of the third pneumatic valve 9 is 0.6 MPa, and when the action pressure value of the in-hole extraction pipe 2 is larger than 0.6 MPa, the third pneumatic valve 9 is opened, although the action pressure value of the pressure control pneumatic valve 1 is higher than the action pressure value of the third pneumatic valve 9, a pipeline between the air storage tank 15 and the third pneumatic valve 9 can be stopped, and the pipeline between the air storage tank 2 and the in the hole can be properly controlled, the action pressure of the fourth pneumatic valve 16 is controlled to be gradually increased, the action pressure value of the air storage tank 2 in the hole is not damaged, and the pressure in the hole 2 is gradually increased, and the action pressure of the air storage tank 2 is not is gradually increased, and the action pressure of the pressure in the air storage tank 2 is controlled is gradually reaches the action pressure value of the pressure valve 2, and is more than the action pressure valve 9 is gradually reaches the action pressure value of the pressure valve 2.
The above embodiments are only for illustrating the technical solution of the present invention, and it should be understood by those skilled in the art that although the present invention has been described in detail with reference to the above embodiments: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention, which is intended to be encompassed by the claims.
Claims (8)
1. The utility model provides an automatic dredging of gas drainage drilling prevents that lead optical device which characterized in that: the device comprises a pumping pipeline, an air supply pipeline, an adjusting pipeline, a pressure control pneumatic valve and a pressurizing pipeline, wherein the pumping pipeline comprises a hole pumping pipe and an exhaust pipe, and the exhaust pipe is provided with a first pneumatic valve; the air supply pipeline is sequentially provided with a first stop valve, a second pneumatic valve and a first one-way valve, and the first one-way valve is connected with the in-hole extraction pipe; the two ends of the adjusting pipeline are respectively connected with the first stop valve and the first pneumatic valve, the adjusting pipeline is sequentially provided with a second stop valve and a third pneumatic valve, the third pneumatic valve is positioned at the tail end of the adjusting pipeline, the opening control pipeline and the closing control pipeline of the first pneumatic valve are respectively connected with the third pneumatic valve, and the opening control pipeline and the closing control pipeline of the second pneumatic valve are respectively connected with the closing control pipeline and the opening control pipeline of the first pneumatic valve; the two ends of the pressurizing pipeline are respectively connected with the adjusting pipeline and the air supply pipeline, the connection point of the pressurizing pipeline and the adjusting pipeline is positioned between the second stop valve and the first stop valve, the connection point of the pressurizing pipeline and the air supply pipeline is positioned between the first one-way valve and the in-hole extraction pipe, the connection point of the pressurizing pipeline and the air supply pipeline is connected with the third pneumatic valve, the pressurizing pipeline is sequentially provided with a pressurizing pump, an air storage tank and a fourth pneumatic ball valve, the opening control pipeline and the closing control pipeline of the fourth pneumatic ball valve are respectively connected with the pressure control pneumatic valve, the pressure control pneumatic valve is connected with the closing control pipeline of the first pneumatic valve through the first connecting pipeline, the pressure control pneumatic valve is connected with the pressurizing pipeline through the second connecting pipeline, and the connection point of the second connecting pipeline and the pressurizing pipeline is positioned between the air storage tank and the fourth pneumatic ball valve; the second stop valve is connected with a closing control pipeline of the second pneumatic valve and a closing control pipeline of the fourth pneumatic ball valve through a third connecting pipeline, a third one-way valve is arranged on the third connecting pipeline, and the third one-way valve is positioned between a connecting point of the third connecting pipeline and the closing control pipeline of the second pneumatic valve and a connecting point of the third connecting pipeline and the closing control pipeline of the fourth pneumatic ball valve; when the third pneumatic valve is closed, the adjusting pipeline is communicated with the closing control pipeline of the first pneumatic valve and the opening control pipeline of the second pneumatic valve, and when the third pneumatic valve is opened, the adjusting pipeline is communicated with the opening control pipeline of the first pneumatic valve and the closing control pipeline of the second pneumatic valve, and the third pneumatic valve is in a normally closed state; when the second stop valve is opened, the second stop valve is communicated with the third pneumatic valve, and when the second stop valve is closed, the second stop valve is communicated with an opening control pipeline of the first pneumatic valve and a closing control pipeline of the second pneumatic valve, and the second stop valve is in a normally open state; when the pressure control pneumatic valve is in a closed state, a closed control pipeline of the first pneumatic valve and a closed control pipeline of the fourth pneumatic ball valve form a passage, and when the pressure control pneumatic valve is opened, the closed control pipeline of the first pneumatic valve and an open control pipeline of the fourth pneumatic ball valve form a passage, and the pressure control pneumatic valve is in a normally closed state;
the adjusting pipeline is provided with a filtering and pressure-adjusting oil mist device combination mechanism which is positioned between the first stop valve and the booster pump;
the first pneumatic valve is a pneumatic butterfly stop valve, the first stop valve is a manual spherical stop valve, the second pneumatic valve is a pneumatic two-position two-way valve, the third pneumatic valve is a pneumatic two-position five-way valve, the second stop valve is a manual two-position five-way valve, and the pneumatic control valve is a pneumatic two-position five-way valve.
2. The automatic dredging and anti-reflection device for gas extraction drilling holes according to claim 1, wherein the device comprises the following components: and the in-hole extraction pipe is connected with the exhaust pipe through a quick connector.
3. The automatic dredging and permeability increasing device for gas extraction drilling according to claim 1 or 2, wherein: the exhaust pipe is provided with a first pressure gauge.
4. The automatic dredging and anti-reflection device for gas extraction drilling holes according to claim 1, wherein the device comprises the following components: and a second pressure gauge is arranged on the pressurizing pipeline.
5. The automatic dredging and permeability increasing device for gas extraction drilling according to claim 1 or 2, wherein: the pressure relief valve is arranged on the pressure boost pipeline and is a manual stop valve.
6. An automatic blocking and permeability increasing method for a gas extraction drill hole by adopting the automatic blocking and permeability increasing device for the gas extraction drill hole, which is characterized by comprising the following steps of:
connecting the front end of an air supply pipeline with an underground air pressing device, opening a first stop valve, enabling one part of gas to enter an adjusting pipeline, and enabling the other part of gas to enter a pressurizing pipeline;
the gas entering the regulating pipeline triggers the third pneumatic valve, the regulating pipeline is communicated with the closing control pipeline of the first pneumatic valve and the opening control pipeline of the second pneumatic valve, so that the first pneumatic valve is closed, and the second pneumatic valve is opened;
after the second pneumatic valve is opened, air exhausted by the underground air pressing device enters the inner extraction pipe through the air supply pipeline;
the booster pump conveys the gas in the booster pipeline to the gas storage tank for continuous pressurization, the gas storage tank, the pressure control pneumatic valve and the closing control pipeline of the fourth pneumatic ball valve form a passage, and the fourth pneumatic ball valve is in a closed state;
when the gas pressure value in the gas storage tank is larger than the action pressure value of the pressure control pneumatic valve, the pressure control pneumatic valve is opened, a closing control pipeline of the first pneumatic valve and an opening control pipeline of the fourth pneumatic ball valve form a passage, the fourth pneumatic ball valve is in an opened state, a pressurizing pipeline and the in-hole extraction pipe form a passage, and high-pressure gas in the gas storage tank is discharged into the in-hole extraction pipe;
when the pressure value of the gas in the gas storage tank is smaller than the action pressure value of the pressure control pneumatic valve through releasing, the pressure control pneumatic valve is closed, a closing control pipeline of the first pneumatic valve and a closing control pipeline of the fourth pneumatic ball valve form a passage, the fourth pneumatic ball valve is in a closing state, and the booster pump conveys the gas in the booster pipeline into the gas storage tank and continuously pressurizes the gas;
repeating the steps (4) to (6), when the gas pressure value in the extraction pipe in the hole reaches the action pressure value of the third pneumatic valve, the adjusting pipeline is communicated with the opening control pipeline of the first pneumatic valve and the closing control pipeline of the second pneumatic valve, so that the first pneumatic valve is opened, the second pneumatic valve is closed, and the gas in the extraction pipe in the hole is rapidly discharged from the exhaust pipe;
when the gas pressure value in the extraction pipe in the hole is lower than the action pressure value of the third pneumatic valve, the third pneumatic valve is reset, and the adjusting pipeline is communicated with the closing control pipeline of the first pneumatic valve and the opening control pipeline of the second pneumatic valve, so that the first pneumatic valve is closed, and the second pneumatic valve is opened;
repeating the steps (2) to (8) for a plurality of times until no coal dust in the extraction pipe in the hole is discharged from the exhaust pipe;
and adjusting the second stop valve, communicating the underground air pressing device with an opening control pipeline of the first pneumatic valve and a closing control pipeline of the second pneumatic valve, opening the first pneumatic valve, closing the second pneumatic valve, discharging and decompressing the gas in the extraction pipe in the hole from the exhaust pipe, and finally closing the first stop valve.
7. The automatic dredging and permeability increasing method for the gas extraction drill hole according to claim 6, wherein the method comprises the following steps of: the action pressure value of the pressure control pneumatic valve is 1.6MPa.
8. The automatic dredging and permeability increasing method for the gas extraction drill hole according to claim 6 or 7, wherein the method comprises the following steps of: the action pressure value of the third pneumatic valve is 0.6 MPa.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102352768A (en) * | 2011-10-19 | 2012-02-15 | 中国矿业大学 | Gas drainage method and equipment with alternative drainage |
| CN103362538A (en) * | 2013-07-15 | 2013-10-23 | 中国矿业大学 | Pressure alternate gas exhausting method by slotting and fracturing coal seams |
| CN104389631A (en) * | 2014-09-17 | 2015-03-04 | 中国矿业大学 | Slotting and fracturing cooperation networking permeability increasing method for low-permeability coal seam |
| CN105822341A (en) * | 2016-06-12 | 2016-08-03 | 河南理工大学 | Low permeability coal bed supercritical carbon dioxide anti-reflection system and method |
| WO2017075935A1 (en) * | 2015-11-06 | 2017-05-11 | 中国矿业大学 | Method of increasing permeability of coal seam using high-power electric blasting assisted by hydraulic fracturing from bottom drainage roadway |
| CN106930724A (en) * | 2017-04-17 | 2017-07-07 | 山东科技大学 | One kind is rich in water borehole sealing and gas pumping integral method |
-
2018
- 2018-04-03 CN CN201810286216.7A patent/CN108561176B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102352768A (en) * | 2011-10-19 | 2012-02-15 | 中国矿业大学 | Gas drainage method and equipment with alternative drainage |
| CN103362538A (en) * | 2013-07-15 | 2013-10-23 | 中国矿业大学 | Pressure alternate gas exhausting method by slotting and fracturing coal seams |
| CN104389631A (en) * | 2014-09-17 | 2015-03-04 | 中国矿业大学 | Slotting and fracturing cooperation networking permeability increasing method for low-permeability coal seam |
| WO2017075935A1 (en) * | 2015-11-06 | 2017-05-11 | 中国矿业大学 | Method of increasing permeability of coal seam using high-power electric blasting assisted by hydraulic fracturing from bottom drainage roadway |
| CN105822341A (en) * | 2016-06-12 | 2016-08-03 | 河南理工大学 | Low permeability coal bed supercritical carbon dioxide anti-reflection system and method |
| CN106930724A (en) * | 2017-04-17 | 2017-07-07 | 山东科技大学 | One kind is rich in water borehole sealing and gas pumping integral method |
Non-Patent Citations (2)
| Title |
|---|
| 三维旋转水射流扩孔增透技术装备及应用;李艳增;;煤矿安全(第11期);全文 * |
| 预置导向槽定向水力压穿增透技术及应用;王耀锋;李艳增;;煤炭学报(第08期);全文 * |
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