CN109184616B - Double-hole pipe grouting plugging device and using method thereof - Google Patents

Abstract

The invention relates to a double-hole pipe grouting plugging device which comprises a grouting bag, a double-hole pipe, a one-way valve, a safety valve, a grout inlet joint, a recyclable grouting pipe, a sealing plug and a plugging pipe, wherein the grouting bag is uniformly distributed along the axial direction of the double-hole pipe, two ends of the grouting bag are connected with the outer surface of the double-hole pipe, the one-way valve is arranged on the double-hole pipe, the safety valve is arranged on the double-hole pipe outside the front end of the grouting bag, the double-hole pipe comprises a pipe body and a partition plate, the tail end of the double-hole pipe is connected with the sealing plug, the front end of the double-hole pipe is connected with the grout inlet joint, the grout inlet joint comprises a protective sleeve, a stop block and an elastic sealing strip, and the using method comprises four steps of plugging device. The gas extraction hole plugging device has the advantages that the structure and the structure are simple, the use is flexible and convenient, the operation flow is simple, the plugging operation efficiency is high when the gas extraction hole plugging operation is carried out, and the purpose of improving the plugging operation quality and efficiency is achieved.

Description

Double-hole pipe grouting plugging device and using method thereof

Technical Field

The invention relates to a double-hole pipe grouting plugging device and a using method thereof, belonging to the technical field of gas extraction.

Background

The types of hole packers in the current market are more. The common penetrating type hole packer has the defects that only one-time hole sealing treatment can be carried out on coal seam drilling, the later gas attenuation cannot be carried out for blocking again, and a grouting pipe cannot be recycled, for example, in the prior art such as a gas extraction fixed type hole packer and a using method thereof (patent number: 201310402234.4) and a gas extraction penetrating type hole packer and a using method thereof in the prior patent scheme, in the specific process, after a hole sealing space is filled with a plugging material, if a coal seam crack develops, the hole sealing slurry can be extruded and pass through a bag through a developing crack around the bag under the action of grouting pressure, the hole sealing slurry is also poured into the designed reserved gas leakage treatment space, so that the later gas leakage treatment cannot be carried out, the plugging performance is poor, the use flexibility and the reliability are seriously insufficient, and aiming at the problem, the hole packer using a double-hole pipe is also available at present, however, although the double-hole pipe is adopted in the patent, one of the two channels of the double-hole pipe is used for grouting, the other channel of the double-hole pipe is used for extracting gas, and the outer diameter of the pipe is larger, so that the double-hole pipe is very easily limited by the structure of the gas extraction hole, the working efficiency of the gas extraction hole sealing operation and the adaptability of the plugging device to the use environment are seriously affected, and therefore, aiming at the problem, a brand-new gas extraction hole plugging device and an extraction method corresponding to the plugging device are urgently needed to be developed to meet the requirements of actual use.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a double-hole pipe grouting plugging device and a using method thereof.

In order to achieve the purpose, the invention is realized by the following technical scheme:

a double-hole pipe grouting plugging device comprises at least two grouting bags, a double-hole pipe, a one-way valve, a safety valve, a grouting connector, a recyclable grouting pipe, a sealing plug and a leakage blocking pipe, wherein the grouting bags are uniformly distributed along the axial direction of the double-hole pipe, two ends of each grouting bag are connected with the outer surface of the double-hole pipe and form a closed annular structure coaxially distributed with a gas extraction pipe, the grouting bags surround the axial direction of the gas extraction pipe, cover the outer surface of the gas extraction pipe and are embedded in the gas extraction hole, a plurality of one-way valves are arranged on the double-hole pipe and are respectively positioned on the positions of the double-hole pipes in each grouting bag and the double-hole pipe outside the grouting bag between the adjacent grouting bags, the one-way valves positioned in the grouting bags are communicated with the double-hole pipe through grout outlets and are communicated with the grouting bags, the one-way valves positioned outside the grouting bags are communicated with the double-hole pipe and the gas extraction hole, the safety valve is arranged at the position of the double-hole pipe close to one end of the grout inlet port and communicated with the double-hole pipe and the gas extraction hole, the double-hole pipe comprises a pipe body and a partition plate, the pipe body is of a closed annular structure with a circular cross section, the partition plate is embedded in the pipe body and distributed coaxially with the pipe body, the partition plate divides the inside of the pipe body into a grouting pipe cavity and a plugging pipe cavity which are parallel to the axis of the pipe body and are independent from each other, the grouting pipe cavity is communicated with the one-way valve and the safety valve which are positioned in the grouting bag through a grout outlet, the plugging pipe cavity is communicated with the one-way valve and the safety valve which are positioned outside the grouting bag through a grout outlet, the grouting pipe cavity and the plugging pipe cavity are communicated with each other through at least two grout outlets, the tail end of the double-hole pipe is connected with the sealing plug, the front end of the double-hole pipe is connected with the grout inlet port, the grout inlet joint comprises a protective sleeve, a stop block and an elastic sealing strip, the stop block is of a T-shaped structure, the stop block is embedded in the protective sleeve and divides the protective sleeve into a grouting channel and a blocking channel, the diameter of the grouting channel is 2-3 times that of the blocking channel, the front section of the protective sleeve is coated outside the double-hole pipe, the front end face of the double-hole pipe abuts against the stop block, a overflowing hole is formed in the stop block, the grouting channel is communicated with a grouting pipe cavity of the double-hole pipe through the overflowing hole, the blocking channel is communicated with the blocking pipe cavity of the double-hole pipe through the overflowing hole, the elastic sealing strip is installed on the stop block and abuts against the end face of the blocking pipe cavity of the double-hole pipe, the rear end of the protective sleeve is communicated with the recyclable grouting pipe and the recyclable grouting pipe respectively, the recyclable grouting pipe is communicated with the grouting channel, the recyclable grouting pipe is communicated with the blocking channel, and the recyclable grouting pipe are connected.

Furthermore, the cross section of the separator is in any one of a rectangular structure or an S-shaped structure.

Furthermore, the baffle and the pipe body are of an integrated structure.

Furthermore, the axial lines of all the grout outlets connected with the same one-way valve and the safety valve form an included angle of 0-120 degrees.

Furthermore, the protective sleeve and the stop block are of an integrated structure.

Furthermore, the plugging channel is of an L-shaped structure.

Furthermore, the cross section of the slurry outlet and the cross section of the overflowing hole are in any one of rectangular and isosceles trapezoid structures.

The use method of the double-hole pipe grouting plugging device comprises the following steps:

firstly, assembling a plugging device, namely determining the number of grouting bags according to the depth and the diameter of a gas extraction hole, wherein the number of the grouting bags is at least two, then assembling the grouting bags, a double-hole pipe, a one-way valve, a slurry inlet joint, a recyclable grouting pipe, a sealing plug and a leakage blocking pipe of the plugging device, after the assembly is completed, penetrating the gas extraction pipe into an annular ring of the annular bag, winding and tightly winding the grouting bags outside the gas extraction pipe, tightly binding the grouting bags, then installing the plugging device connected with the gas extraction pipe into the gas extraction hole, and finally connecting the recyclable grouting pipe and the grouting pipe with a grouting pump;

secondly, grouting and sealing holes, wherein after the operation of the first step is finished, a grouting pump is started, grout for plugging is conveyed into a grouting pipe cavity of the double-hole pipe through a recyclable grouting pipe, the grout is conveyed into a grouting pipe cavity through a one-way valve in a grouting bag and conveyed into a grouting bag, the grouting pump is kept to work continuously, the pressure of the grout in the grouting bag is continuously increased, and when the pressure is greater than the set pressure of the safety valve, the safety valve is opened, the pressure of the grout in the grouting pipe cavity is released, and grouting operation in the grouting bag is finished;

thirdly, sealing and plugging, after the grouting operation of the second step is completed, closing the connection between the grouting pump and the recyclable grouting pipe, then taking out and recycling the recyclable grouting pipe, simultaneously opening the communication between the grouting pump and the plugging pipe, and injecting the slurry into the gas extraction hole through the plugging pipe cavity of the double-hole pipe and the one-way valve positioned outside the grouting bag, so as to realize the plugging operation of the gas extraction hole and repair and seal the crack on the side wall of the gas extraction hole;

and fourthly, recovering the grouting pipe, applying external force along the axial direction of the recoverable grouting pipe after the third step of operation is completed and before the grout is not solidified, breaking the shearing pin and taking down the recoverable grouting pipe when the external force is greater than the bearing capacity of the shearing pin, and cleaning the grouting pipe.

The hole sealing method has the advantages that the structure is simple, the use is flexible and convenient, the plugging operation requirements of various gas extraction holes can be flexibly met according to the use requirements, on the other hand, when the plugging operation of the gas extraction holes is carried out, the operation flow is simple, the plugging operation efficiency is high, the use and the loss rate of plugging materials can be effectively reduced, the defects such as cracks on the hole wall of the gas extraction holes can be sealed and repaired, the generation and the development of coal wall cracks around the drilled holes of the hole sealing section can be effectively avoided, in addition, the high stress area is generated around the drilled holes of the hole sealing section, the air permeability of coal bodies around the drilled holes is greatly reduced, and the purposes of improving the plugging operation quality and efficiency are achieved.

Drawings

The invention is described in detail below with reference to the drawings and the detailed description;

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic cross-sectional view of the present invention;

FIG. 3 is a schematic view of a dual-orifice tube configuration;

FIG. 4 is a schematic view of a slurry inlet joint structure;

FIG. 5 is a flow chart of a method of use of the present invention.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

The double-hole pipe grouting plugging device comprisesgrouting bags 1, double-hole pipes 2,check valves 3, a safety valve 4, agrout inlet joint 7, arecyclable grouting pipe 6, a sealing plug 5 and a leakage blocking pipe 8, wherein the number of thegrouting bags 1 is at least two, eachgrouting bag 1 is uniformly distributed along the axial direction of the double-hole pipe 2, two ends of eachgrouting bag 1 are connected with the outer surface of the double-hole pipe 2 and form a closed annular structure which is coaxially distributed with agas extraction pipe 9 together with the double-hole pipe 2, thegrouting bags 1 surround the axial line of thegas extraction pipe 9, cover the outer surface of thegas extraction pipe 9 and are embedded in thegas extraction hole 10, a plurality of thecheck valves 3 are arranged on the double-hole pipes 2 and are respectively positioned on the positions of the double-hole pipes 2 in eachgrouting bag 1 and the double-hole pipes 2 outside thegrouting bags 1 between theadjacent grouting bags 1, wherein thecheck valves 3 positioned inside thebags 1 are communicated with the double-hole pipes 2 through grout outlet ports 11, and the one-way valve 3 positioned outside thegrouting bag 1 is communicated with the double-hole pipe 2 and thegas extraction hole 10, and one safety valve 4 is arranged and arranged on the position of the double-hole pipe 2 at one end close to the slurry inlet port and communicated with the double-hole pipe 2 and thegas extraction hole 10.

In this embodiment, the dual-hole tube 2 includes atube body 21 and apartition 22, thetube body 21 is a closed ring structure with a circular cross section, thepartition 22 is embedded in thetube body 21, and is distributed coaxially with thetube body 21, thepartition board 22 divides the interior of the tube body into agrouting tube cavity 24 and aplugging tube cavity 23 which are parallel to the axis of thetube body 21 and are independent from each other, wherein thegrouting pipe cavity 24 is mutually communicated with the one-way valve 3 and the safety valve 4 which are positioned inside thegrouting bag 1 through the grout outlet 11, theplugging pipe cavity 23 is mutually communicated with the one-way valve 3 and the safety valve 4 which are positioned outside thegrouting bag 1 through the grout outlet 11, and thegrouting pipe cavity 24 and theplugging pipe cavity 23 are communicated with each one-way valve 3 and the safety valve 4 through at least two grout outlets 11, the tail end of the double-hole pipe 2 is connected with the sealing plug 5, the front end of the double-hole pipe is connected with thegrout inlet connector 7, and the double-hole pipe is communicated with therecoverable grouting pipe 6 and the plugging pipe 8 through thegrout inlet connector 7.

In this embodiment, thegrout inlet joint 7 includes a protectingsleeve 71, ablock 72 and anelastic sealing strip 73, theblock 72 is a "T" shaped structure, is embedded in the protectingsleeve 71 and divides the protectingsleeve 71 into agrouting channel 74 and aplugging channel 75, the diameter of thegrouting channel 74 is 2-3 times of that of theplugging channel 75, the front section of the protectingsleeve 71 is covered outside the dual-hole tube 2, the front end surface of the dual-hole tube 2 abuts against theblock 73, theblock 72 is provided with a overflowinghole 76, thegrouting channel 74 is communicated with thegrouting tube cavity 24 of the dual-hole tube 2 through the overflowinghole 76, theplugging channel 75 is communicated with theplugging tube cavity 23 of the dual-hole tube 2 through the overflowinghole 76, theelastic sealing strip 73 is installed on theblock 72 and abuts against the end surface of theplugging tube cavity 23 of the dual-hole tube 2, the rear end of the protectingsleeve 71 is communicated with therecoverable grouting tube 6 and the plugging tube 8 respectively, wherein therecoverable grouting tube 6 is communicated with thegrouting channel 74, and the plugging channel 8 are communicated with each, at least oneshear pin 77 is provided on thegrout passage 74 and interconnected with theretrievable grout pipe 6 by theshear pin 77.

In this embodiment, the cross section of thepartition 22 is in any one of a rectangular or "S" shape.

In this embodiment, thepartition 22 and thetube 21 are of an integral structure.

In the embodiment, the axial line of each slurry outlet 11 connected with the same one-way valve 3 and the safety valve 4 in the slurry outlet 11 forms an included angle of 0-120 degrees.

In this embodiment, thesheath tube 71 and thestopper 72 are of an integrated structure.

In this embodiment, the blockingchannel 75 is an "L" shaped structure.

In this embodiment, the slurry outlet 11 and the overflowinghole 76 are in any one of a rectangular and isosceles trapezoid structure in cross section.

As shown in fig. 5, the use method of the dual-hole pipe grouting plugging device in this embodiment includes the following steps:

firstly, assembling a plugging device, namely determining the number of grouting bags according to the depth and the diameter of a gas extraction hole, wherein the number of the grouting bags is at least two, then assembling the grouting bags, a double-hole pipe, a one-way valve, a slurry inlet joint, a recyclable grouting pipe, a sealing plug and a leakage blocking pipe of the plugging device, after the assembly is completed, penetrating the gas extraction pipe into an annular ring of the annular bag, winding and tightly winding the grouting bags outside the gas extraction pipe, tightly binding the grouting bags, then installing the plugging device connected with the gas extraction pipe into the gas extraction hole, and finally connecting the recyclable grouting pipe and the grouting pipe with a grouting pump;

secondly, grouting and sealing holes, wherein after the operation of the first step is finished, a grouting pump is started, grout for plugging is conveyed into a grouting pipe cavity of the double-hole pipe through a recyclable grouting pipe, the grout is conveyed into a grouting pipe cavity through a one-way valve in a grouting bag and conveyed into a grouting bag, the grouting pump is kept to work continuously, the pressure of the grout in the grouting bag is continuously increased, and when the pressure is greater than the set pressure of the safety valve, the safety valve is opened, the pressure of the grout in the grouting pipe cavity is released, and grouting operation in the grouting bag is finished;

thirdly, sealing and plugging, after the grouting operation of the second step is completed, closing the connection between the grouting pump and the recyclable grouting pipe, then taking out and recycling the recyclable grouting pipe, simultaneously opening the communication between the grouting pump and the plugging pipe, and injecting the slurry into the gas extraction hole through the plugging pipe cavity of the double-hole pipe and the one-way valve positioned outside the grouting bag, so as to realize the plugging operation of the gas extraction hole and repair and seal the crack on the side wall of the gas extraction hole;

and fourthly, recovering the grouting pipe, applying external force along the axial direction of the recoverable grouting pipe after the third step of operation is completed and before the grout is not solidified, breaking the shearing pin and taking down the recoverable grouting pipe when the external force is greater than the bearing capacity of the shearing pin, and cleaning the grouting pipe.

The hole sealing method has the advantages that the structure is simple, the use is flexible and convenient, the plugging operation requirements of various gas extraction holes can be flexibly met according to the use requirements, on the other hand, when the plugging operation of the gas extraction holes is carried out, the operation flow is simple, the plugging operation efficiency is high, the use and the loss rate of plugging materials can be effectively reduced, the defects such as cracks on the hole wall of the gas extraction holes can be sealed and repaired, the generation and the development of coal wall cracks around the drilled holes of the hole sealing section can be effectively avoided, in addition, the high stress area is generated around the drilled holes of the hole sealing section, the air permeability of coal bodies around the drilled holes is greatly reduced, and the purposes of improving the plugging operation quality and efficiency are achieved.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (8)

1. Diplopore pipe slip casting plugging device, its characterized in that: the double-hole pipe grouting plugging device comprises at least two grouting bags, a double-hole pipe, one-way valves, a safety valve, a grouting connector, a recyclable grouting pipe, a sealing plug and a leakage blocking pipe, wherein the grouting bags are uniformly distributed along the axial direction of the double-hole pipe, two ends of each grouting bag are connected with the outer surface of the double-hole pipe and form a closed annular structure coaxially distributed with a gas extraction pipe with the double-hole pipe, the grouting bags surround the axial direction of the gas extraction pipe, cover the outer surface of the gas extraction pipe and are embedded in the gas extraction hole, a plurality of one-way valves are arranged on the double-hole pipe and are respectively positioned on the positions of the double-hole pipes in each grouting bag and the double-hole pipes outside the grouting bags between the adjacent grouting bags, the one-way valves positioned in the grouting bags are communicated with the double-hole pipes through grouting ports and are communicated with the grouting bags, the one-way valve and the double-hole pipe which are positioned outside the grouting bag are mutually communicated and are mutually communicated with the gas extraction hole, one safety valve is arranged and is arranged at the position of the double-hole pipe which is close to one end of the grout inlet port and is mutually communicated with the double-hole pipe and the gas extraction hole, the double-hole pipe comprises a pipe body and a partition plate, the cross section of the pipe body is of a closed annular structure with a circular shape, the partition plate is embedded in the pipe body and is coaxially distributed with the pipe body, the partition plate divides the inside of the pipe body into a grouting pipe cavity and a plugging pipe cavity which are parallel to the axis of the pipe body and are mutually independent, the grouting pipe cavity is mutually communicated with the one-way valve and the safety valve which are positioned inside the grouting bag through grout outlet ports, the plugging pipe cavity is mutually communicated with the one-way valve and the safety valve which are positioned outside the grouting bag through grout outlet ports, and the grouting pipe cavity and the plugging pipe cavity are, the tail end of the double-hole pipe is connected with the sealing plug, the front end of the double-hole pipe is connected with the grout inlet joint and is respectively communicated with the recoverable grouting pipe and the leakage blocking pipe through the grout inlet joint, the grout inlet joint comprises a protective sleeve, a stop block and an elastic sealing strip, the stop block is of a T-shaped structure, is embedded in the protective sleeve and divides the protective sleeve into a grouting channel and a leakage blocking channel, the diameter of the grouting channel is 2-3 times of that of the leakage blocking channel, the front section of the protective sleeve is coated outside the double-hole pipe, the front end face of the double-hole pipe is abutted against the stop block, the stop block is provided with an overflowing hole, the grouting channel is communicated with the grouting pipe cavity of the double-hole pipe through the overflowing hole, the leakage blocking channel is communicated with the leakage blocking pipe cavity of the double-hole pipe through the overflowing hole, the elastic sealing strip is arranged on the stop block and abutted against the end face of the leakage blocking pipe, the rear end of the protective sleeve is respectively communicated with the recoverable, the recoverable grouting pipe is communicated with the grouting channel, the leakage blocking pipe is communicated with the blocking channel, and the grouting channel is provided with at least one shearing pin and is connected with the recoverable grouting pipe through the shearing pin.

2. The dual bore pipe grout sealer of claim 1, wherein: the cross section of the separator is in any one of a rectangular structure or an S-shaped structure.

3. The dual bore pipe grout sealer of claim 1, wherein: the baffle and the pipe body are of an integrated structure.

4. The dual bore pipe grout sealer of claim 1, wherein: in the slurry outlet, the axes of the slurry outlets connected with the same one-way valve and the safety valve form an included angle of 0-120 degrees.

5. The dual bore pipe grout sealer of claim 1, wherein: the protective sleeve and the stop block are of an integrated structure.

6. The dual bore pipe grout sealer of claim 1, wherein: the plugging channel is of an L-shaped structure.

7. The dual bore pipe grout sealer of claim 1, wherein: the cross section of the slurry outlet and the cross section of the flow hole are in any one of rectangular and isosceles trapezoid structures.

8. The use method of the double-hole pipe grouting plugging device according to any one of the claims 1-7, characterized in that: the use method of the double-hole pipe grouting plugging device comprises the following steps:

firstly, assembling a plugging device, namely determining the number of grouting bags according to the depth and the diameter of a gas extraction hole, wherein the number of the grouting bags is at least two, then assembling the grouting bags, a double-hole pipe, a one-way valve, a slurry inlet joint, a recyclable grouting pipe, a sealing plug and a leakage blocking pipe of the plugging device, after the assembly is completed, penetrating the gas extraction pipe into an annular ring of the annular bag, winding the grouting bags to tightly hold the gas extraction pipe, then installing the plugging device connected with the gas extraction pipe into the gas extraction hole together, and finally connecting the recyclable grouting pipe and the grouting pipe with a grouting pump;

secondly, grouting and sealing holes, wherein after the operation of the first step is finished, a grouting pump is started, grout for plugging is conveyed into a grouting pipe cavity of the double-hole pipe through a recyclable grouting pipe, the grout is conveyed into the grouting pipe cavity through a one-way valve in a grouting bag and then conveyed into a grouting bag, the grouting pump is kept to work continuously, the pressure of the grout in the grouting bag is continuously increased, and when the pressure is greater than the set pressure of the safety valve, the safety valve is opened, the grout in the grouting pipe cavity is decompressed, and grouting operation in the grouting bag is finished;

thirdly, sealing and plugging, after the grouting operation of the second step is completed, closing the connection between the grouting pump and the recyclable grouting pipe, then taking out and recycling the recyclable grouting pipe, simultaneously opening the communication between the grouting pump and the plugging pipe, and injecting the slurry into the gas extraction hole through the plugging pipe cavity of the double-hole pipe and the one-way valve positioned outside the grouting bag, so as to realize the plugging operation of the gas extraction hole and repair and seal the crack on the side wall of the gas extraction hole;

and fourthly, recovering the grouting pipe, applying external force along the axial direction of the recoverable grouting pipe after the third step of operation is completed and before the grout is not solidified, breaking the shearing pin and taking down the recoverable grouting pipe when the external force is greater than the bearing capacity of the shearing pin, and cleaning the grouting pipe.

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