CN107605461B - Observation method of mine rock mass drilling gas plugging and extraction integrated system - Google Patents
Observation method of mine rock mass drilling gas plugging and extraction integrated system Download PDFInfo
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- CN107605461B CN107605461B CN201710953117.5A CN201710953117A CN107605461B CN 107605461 B CN107605461 B CN 107605461B CN 201710953117 A CN201710953117 A CN 201710953117A CN 107605461 B CN107605461 B CN 107605461B
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- 238000005553 drilling Methods 0.000 title claims abstract description 43
- 238000000605 extraction Methods 0.000 title claims abstract description 40
- 239000011435 rock Substances 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000012360 testing method Methods 0.000 claims abstract description 50
- 239000000523 sample Substances 0.000 claims abstract description 41
- 238000007789 sealing Methods 0.000 claims abstract description 37
- 230000000694 effects Effects 0.000 claims abstract description 12
- 239000002775 capsule Substances 0.000 claims description 23
- 239000000463 material Substances 0.000 claims description 21
- 239000003245 coal Substances 0.000 claims description 16
- 238000005259 measurement Methods 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 3
- 238000005065 mining Methods 0.000 claims 8
- 239000012535 impurity Substances 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 3
- 230000002708 enhancing effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
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Abstract
The invention discloses an observation method of a mine rock mass drilling gas plugging and extraction integrated system, which solves the problems of poor sealing effect, high extraction cost and difficult gas collection of the mine rock mass drilling in the prior art, and has the effects of improving the stability of the plugging process and the gas extraction process and enhancing the sealing performance; the technical scheme is as follows: the method comprises the following steps: drilling a gas extraction borehole; mounting a test probe, connecting the test probe with a drill rod, and pushing the test probe to a specified extraction area by using a drilling machine; sealing the drilled hole; carrying out a pressure resistance test; and (3) measuring gas parameters: and connecting the measuring system, opening the third switch, enabling the gas to enter the collecting pipe and enter the measuring system through the communicating pipe, and reading the readings of the gas pressure gauge after the gas pressure gauge is stabilized and comparing the readings with the readings of the electronic pressure gauge.
Description
Technical Field
The invention belongs to the technical field of mine rock mass drilling extraction, and particularly relates to an observation method of a mine rock mass drilling gas plugging extraction integrated system.
Background
The gas pressure and the gas content are key basic parameters for researching coal and gas outburst, gas emission and gas drainage of a mine, so that the measurement of the gas pressure and the gas content of a coal bed is necessary for researching occurrence of the coal bed gas and emission rules.
According to the relevant regulations of the coal industry standard, a pressure measuring drilling site is selected in a roadway adjacent to a coal seam, and generally, a complete hard coal rock is drilled with upward holes. The conventional way of blocking a borehole is to fill a concrete filling material into the borehole or to install a baffle plate in the borehole to form a sealed space, and fill the filling material into the sealed space through a separate pipe.
In the plugging mode, the plugging medium is a solid medium, so that after the solid medium is solidified, a cracking phenomenon easily occurs, sometimes, a phenomenon that a solid material cannot seal rock mass cracks around the drilling wall of a corresponding section occurs, and a two-section sealing mode is mostly adopted, so that the sealing effect is poor; in addition, the integration degree of the gas plugging extraction equipment is low, the gas extraction process cannot be effectively monitored, the traditional gas extraction system is mostly a disposable consumable product and cannot be reused, and the gas extraction cost is increased.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides an observation method of a mine rock mass drilling gas plugging and extraction integrated system, which improves the stability of the plugging process and the gas extraction process; the flexible medium is adopted to simultaneously expand the plugging units and the sealed cavity, so that triple plugging is realized, and the sealing effect of the drilled hole is further ensured.
The invention adopts the following technical scheme:
the observation method of the mine rock mass drilling gas plugging and extraction integrated system comprises the following steps:
step (1), drilling a gas extraction borehole: drilling holes to a coal seam of an appointed extraction area in a top plate coal rock mass or a bottom plate coal rock mass in a roadway according to a set angle by using a drilling machine;
mounting a test probe, connecting the test probe with a drill rod, and pushing the test probe to a specified extraction area by using a drilling machine; the test probe comprises a conical head, a II-type plugging unit and two I-type plugging units; the head part of the II-type plugging unit is connected with one I-type plugging unit through a collection pipe, and the tail part of the II-type plugging unit is provided with a side leakage valve and is connected with the other I-type plugging unit through a communicating pipe;
step (3), sealing and drilling: after the test probe reaches a designated area, the test probe is connected with a supply console and a drill rod by a hose, and a flexible plugging medium with set pressure is provided for the test probe;
step (4) pressure resistance test: performing a pressure resistance test to test the hole sealing effect, and if the hole sealing is unqualified, repeating the step (3);
step (5), gas parameter determination: and connecting the test probe with a measurement system, and reading the readings of the gas pressure gauge after the gas pressure gauge in the measurement system is stable.
Furthermore, in the step (2), sundries in the drill hole are cleaned firstly, and then the drill head, the top I-shaped plugging unit, the collecting pipe, the II-shaped plugging unit, the communicating pipe and the tail I-shaped plugging unit are connected in sequence.
Further, in the step (3), first, a first switch of the supply operation console is opened, and the flexible plugging medium enters the type I plugging unit and the type II plugging unit through the communicating pipe and the collecting pipe, so that the type I plugging unit and the type II plugging unit expand to form a sealed cavity and a collecting cavity respectively;
continuously increasing the pressure of the flexible plugging medium, opening the side leakage valve, enabling the flexible plugging medium to enter the sealed cavity, filling the sealed cavity, and filling rock mass cracks around the sealed cavity; after the flow indicating number supplied to the operation table is stable, the first switch is closed, the second switch is opened, and the flexible plugging medium in the communicating pipe and the collecting pipe is cleared, so that the inside of the pipeline is kept smooth.
Further, the measuring system comprises a collecting tank, an electronic pressure gauge and a gas pressure gauge which are sequentially connected through pipelines; a one-way stop valve is arranged on a pipeline between the collecting tank and the electronic pressure gauge, and a third switch is arranged on a pipeline connecting the gas pressure gauge and the test probe;
and (5) after the test probe is connected with the measuring system, opening the third switch, reading the reading of the gas pressure gauge after the gas pressure gauge is stable, comparing the reading with the reading of the electronic pressure gauge, and taking the average value of the readings of the gas pressure gauge and the electronic pressure gauge as the value of the gas pressure in the collecting cavity.
Furthermore, the I-shaped plugging unit comprises an I-shaped tubular joint, a first plugging capsule and a fourth switch, the fourth switch is arranged on one side of the I-shaped tubular joint in the circumferential direction, the first plugging capsule wraps the outer side of the I-shaped tubular joint, and a channel for containing plugging materials is arranged inside the I-shaped tubular joint.
Furthermore, two ends of the I-shaped tubular joint are provided with protruding parts, a groove is formed between the protruding parts, and one side of the groove is provided with a through hole for a fourth switch to pass through; the fourth switch comprises a cover cap and a first spring, one end of the cover cap is connected with the inner wall of the I-shaped tubular joint through the first spring, and the other end of the cover cap is arranged on the outer side of the I-shaped tubular joint.
Furthermore, the cap is of a T-shaped structure, a cap sleeve is arranged on the inner side of the cap, the cap sleeve is fixed on the outer side of the through hole, and first small holes are formed in two sides of the cap sleeve;
when the first spring is in a free state, the cap seals the first small hole; the first spring is in a compressed state, the cover cap bounces, and the channel is communicated with a cavity between the first plugging capsule and the I-shaped tubular joint through the first small hole.
Furthermore, the II-type plugging unit comprises an II-type tubular joint, a second plugging capsule and a fifth switch, the fifth switch is arranged on one side of the circumference of the II-type tubular joint, the second plugging capsule is coated on the outer side of the II-type tubular joint, and a channel for containing plugging materials is arranged in the II-type tubular joint.
Furthermore, the side leakage valve comprises a base body pipe, a rubber ball, a second spring and an adjusting nut, wherein a second small hole is symmetrically formed in the rear side of the inside of the base body pipe along the axis, the rubber ball is arranged in the second small hole, the rear side of the rubber ball is in contact with one end of the second spring, and the other end of the second spring is in contact with the adjusting nut.
Furthermore, a plurality of third small holes are formed in the collecting pipe, and two one-way sealing strips which are arranged oppositely are arranged in the third small holes; an opening facing the inner wall of the collecting pipe is formed between the two one-way sealing strips, gas enters the collecting pipe through the one-way sealing strips, and the one-way sealing strips prevent plugging materials from directly entering the drill hole through the third small hole.
Compared with the prior art, the invention has the beneficial effects that:
(1) the gas plugging and extraction integrated system simplifies the system structure and the plugging process, and improves the plugging efficiency; the gas extraction process can be effectively monitored, and the gas can be collected and subjected to component and content analysis;
(2) according to the invention, a triple plugging mode of the I-type plugging unit, the II-type plugging unit and the sealed cavity is adopted, and a flexible plugging medium is matched, so that the sealing effect of the drilled hole is enhanced, the rock mass crack around the drilled hole of the sealing section can be sealed, and the sealing effect is further improved;
(3) the I-type plugging unit and the II-type plugging unit are respectively provided with a switch, the switches are kept closed in a normal state of a spring, and only when plugging materials are filled in the I-type plugging unit and the II-type plugging unit, the switches are bounced because the plugging materials exert pressure on the spring, and the plugging materials flow into a drill hole from corresponding small holes; the sealing performance and the filling effect of the equipment are improved;
(4) the tail part of the II-type plugging unit is connected with a side leakage valve, and the pretightening force of a spring can be adjusted by rotating an adjusting nut in the side leakage valve so as to adjust the opening pressure of a rubber ball; the side leakage valve has certain initial opening pressure, and after the plugging capsule expands and a drilling hole forms a sealed cavity and a collection cavity, a flexible plugging medium enters the sealed cavity through the side leakage valve, so that the sealing effect of the sealed cavity on the drilling hole is enhanced;
drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 is a schematic illustration of a propulsion feed system configuration according to the present invention;
FIG. 2 is a schematic view of a gas extraction state of the present invention;
FIG. 3 is a schematic view of a test probe according to the present invention;
FIG. 4 is a schematic view of the structure of the cone head of the present invention;
FIG. 5 is a schematic structural diagram of a type I plugging unit of the present invention;
FIG. 6 is a schematic diagram of a fourth switch structure according to the present invention;
FIG. 7 is a schematic view of a collection tube of the present invention;
FIG. 8 is an enlarged view of a portion of a collection tube of the present invention;
FIG. 9 is a schematic view of a communication tube configuration of the present invention;
FIG. 10 is a schematic structural diagram of a type II plugging unit of the present invention;
FIG. 11 is a schematic view of a side leakage valve according to the present invention;
FIG. 12 is a cross-sectional view of a side leakage valve of the present invention;
wherein, 1, a coal rock body, 2, a drilling hole, 3, a conical head, 4, a type I plugging unit, 5, a type II plugging unit, 6, a sealed cavity, 7, a collecting cavity, 8, a communicating pipe, 9, a collecting pipe, 10, a drill rod, 11, a hose, 12, a drilling machine, 13, a supply operation table, 14, a first switch, 15, a pressure gauge, 16, a flow meter, 17, a second switch, 18, a collecting operation table, 19, a third switch, 20, a gas pressure gauge, 21, an electronic pressure gauge, 22, a collecting tank, 23, a one-way stop valve, 24, a flexible plugging medium, 25, a side leakage valve, 26, a type II tubular joint, 27, a second plugging capsule, 28, a cover cap, 29, a first spring, 30, a first small hole, 31, a third small hole, 32, a one-way sealing strip, 33, a base pipe, 34, a rubber ball, 35, a second spring, 36, a second small hole, 37 and an adjusting nut, 38. a fourth switch 39, an I-shaped tubular joint 40, a first plugging capsule 41 and a fifth switch.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As introduced by the background art, the defects that the mine rock mass borehole sealing effect is poor, the extraction cost is high, and gas is not easy to collect exist in the prior art, and in order to solve the technical problems, the application provides the observation method of the mine rock mass borehole gas plugging extraction integrated system.
In a typical embodiment of the application, an observation method of a mine rock mass drilling gas plugging and extraction integrated system is provided.
As shown in fig. 3-12, the test probe comprises a conical head 3, a type II plugging unit 5 and two type I plugging units 4, and the tail of the type II plugging unit 5 is connected with a side leakage valve 25; the II-type plugging unit 5 is arranged between the two I-type plugging units 4.
The head part of the II-type plugging unit 5 is connected with one I-type plugging unit 4 through a collection pipe 9 and forms a collection cavity 7 with the inner wall of the drill hole 2, and the tail part of the II-type plugging unit is connected with the other I-type plugging unit 4 through a communicating pipe 8 and forms a sealed cavity 6 with the inner wall of the drill hole 2; the I-type plugging unit 4 arranged at the head part of the II-type plugging unit 5 is connected with the conical head 3; the plugging material expands simultaneously and realizes triple plugging through the I-type plugging unit 4, the II-type plugging unit 5 and the sealed cavity 6 which are connected through the communicating pipe 8.
As shown in fig. 4, the conical head 3 is arranged at the head of the test probe, and is in threaded connection with the I-shaped plugging unit 4 to play a guiding role.
As shown in fig. 7 and 8, one end of the collection tube 9 is in threaded connection with the type I plugging unit 4 at the head of the test probe, and the other end is in threaded connection with the type II plugging unit 5; the collecting pipe 9 is provided with a plurality of third small holes 31 in a penetrating manner, two one-way sealing strips 32 are installed in the third small holes 31, the one-way sealing strips 32 form a certain included angle with the pipe wall of the collecting pipe 9, an opening formed between the two one-way sealing strips 32 is only opened towards the inner wall of the collecting pipe 9, gas in the drill hole 2 can enter the collecting pipe 9 through the opening between the one-way sealing strips 32, and meanwhile, the flexible plugging medium 24 can be prevented from directly entering the drill hole 2 through the third small holes 31 when the expansion I-shaped plugging unit 4 and the expansion II-shaped plugging unit 5 are started.
As shown in fig. 5 and 6, two I-type plugging units 4 are respectively located at the tail part and the head part of the test probe, each I-type plugging unit 4 includes an I-type tubular joint 39, a first plugging capsule 40 and a fourth switch 38, each I-type tubular joint 39 is of a tubular structure with two ends protruding and a middle part recessed, each first plugging capsule 40 is wrapped and fixed at the middle recessed part of each I-type tubular joint 39, and a channel is arranged inside each I-type tubular joint 39; the fourth switch 38 is fixed in the middle of the outer tube wall of the I-shaped tubular joint 39 and is arranged inside the first plugging capsule 40.
The fourth switch 38 comprises a cap 28, a first spring 29 and a cap set, the cap 28 is of a T-shaped structure, two sides of the top of the cap 28 are provided with vertical plates, the bottom of the cap 28 penetrates through an I-shaped tubular joint 39 to the inside of the cap, two sides of the bottom of the cap 28 are provided with connecting plates, and the connecting plates are connected with the inner wall of the I-shaped tubular joint 39 through the first spring 29.
The cap sleeve is fixed on the outer side of the I-shaped tubular joint 39 and matched with the cap 28, the inner part of the cap sleeve is a cavity, and first small holes 30 are formed in two sides of the cap sleeve; in a normal state, the cap 28 is in a closed state under the action of the first spring 29, and the vertical plate just seals the first small hole 30; when the plugging material is filled, the cap 28 is jacked upwards by the plugging material with certain pressure, the inside of the I-shaped tubular joint 39 and the first small hole 30 form a passage, at the moment, the plugging material enters the cavities of the I-shaped tubular joint 39 and the first plugging capsule 40 through the first small hole 30, and the first plugging capsule 40 expands.
The plugging material is a flexible plugging medium 24 in a fluid form.
The number of the type II plugging units 5 is one, and the type II plugging unit 5 is disposed between two type I plugging units 4, as shown in fig. 10, the type II plugging unit 5 includes a second plugging capsule 27, a type II tubular joint 26, and a fifth switch 41, and the structure and the arrangement of the fifth switch 41 are the same as those of the fourth switch 38, which is not described herein again.
One end of the II-shaped tubular joint 26 is provided with a concave part, the other end of the II-shaped tubular joint is provided with a convex part, a groove is formed between the concave part and the convex part, and one side of the groove is provided with a through hole; the inside of the II-shaped tubular fitting 26 is provided with a passage for receiving plugging material.
The recessed part at the tail part of the II-shaped tubular joint 26 is in threaded connection with the side leakage valve 25.
As shown in fig. 11 and 12, the side leakage valve includes a base pipe 33, two second springs 35, two rubber balls 34, two second small holes 36, and two adjusting nuts 37. The base pipe 33 is a cylindrical pipe structure, a stepped channel is arranged inside one end of the base pipe, the stepped channel is in threaded connection with a recessed part at the tail part of the II-type plugging unit 5, and the recessed part is arranged inside the stepped channel.
A cylindrical channel with the inner diameter smaller than that of the stepped channel is arranged on the rear side of the stepped channel, second small holes 36 are symmetrically arranged on two sides of the cylindrical channel, each second small hole 36 is a stepped hole, one end of each second small hole is communicated with the stepped channel, and the other end of each second small hole is communicated with the drill hole 2; the rubber ball 34 is arranged at the step of the second small hole 36, the second spring 35 and the adjusting nut 37 are arranged on the rear side of the rubber ball 34, and the pretightening force of the second spring 35 can be adjusted by rotating the adjusting nut 37 so as to adjust the opening pressure of the rubber ball 34.
The flexible plugging medium 24 can enter the sealed cavity 6 through the side leakage valve 25, not only can seal the drill hole 2, but also can further seal rock body cracks around the drill hole 2. Meanwhile, the flexible plugging medium 24 can also enter the collection cavity 7 through the side leakage valve 25, further damage is carried out along rock mass cracks around the collection cavity 7 by utilizing the high pressure action of the flexible plugging medium, the crack permeability is increased, and then the flexible plugging medium 24 enters the collection pipe 9 through a third small hole 31 and a one-way sealing strip 32 on the collection pipe 9 and is discharged.
The propulsion system is connected with the tail part of the test probe and propels the test probe to a specified position in the drill hole 2.
As shown in fig. 1, the propulsion system comprises a drill rod 10 and a drilling machine 12, wherein the drill rod 10 is connected with the tail part of the test probe and plays the dual roles of lengthening and propelling, and the drilling machine 12 propels the test probe to a specified drilling position through the drill rod 10.
The supply system provides a set pressure of plugging material into the test probe.
The supply system is provided with a supply operation platform 13, the supply operation platform 13 is provided with a first switch 14, a pressure gauge 15, a flow meter 16 and a second switch 17 which are connected in sequence, and the second switch 17 is connected with the drill rod 10 through a hose 11.
The supply station 13 supplies a pressure of a flexible plugging medium 24 into the test probe via the hose 11 and the drill rod 10.
The pressure gauge 15 is used to observe the pressure of the flexible plugging medium 24 supplied to the operation table 13, and the flow meter 16 is used to read the flow rate of the flexible plugging medium 24 passing through.
As shown in fig. 2, the measuring system comprises a collecting system and a testing probe, the collecting system comprises a collecting operation table 18 and a collecting tank 22, an electronic pressure gauge 21 and a gas pressure gauge 20, the collecting tank 22, the electronic pressure gauge 21 and the gas pressure gauge 20 are sequentially connected through a pipeline, and the gas pressure gauge 20 is connected with the I-type plugging unit 4 through a pipeline.
A one-way stop valve 23 is arranged on a pipeline between the collecting tank 22 and the electronic pressure gauge 21, and a third switch 19 is arranged on pipelines between the gas pressure gauge 20 and the I-shaped plugging unit 4.
The collecting operation table 18 is used for collecting gas in the collecting cavity 7, the gas pressure gauge 20 is used for reading gas pressure readings, and the electronic pressure gauge 21 and the gas pressure gauge 20 are mutually corrected, so that the accuracy of gas pressure parameters is guaranteed. The one-way shut-off valve 23 ensures that the gas can only flow one-way into the holding tank 22.
The observation method comprises the following specific steps:
(1) and (3) drilling a gas extraction borehole 2: and (3) successively constructing drill holes 2 with specified angles in the top plate coal rock body 1 or the bottom plate coal rock body 1 in the roadway by using a drilling machine 12 until the coal seam reaches the specified extraction area.
(2) Installing a test probe: cleaning sundries in the drill hole 2, sequentially connecting a conical head 3, an I-shaped plugging unit 4, a collecting pipe 9, an II-shaped plugging unit 5, a communicating pipe 8 and the like, connecting the I-shaped plugging unit 4 at the tail part of the test probe with a drill rod 10, and pushing the mounted test probe to a specified extraction area by using a drilling machine 12.
(3) And (3) sealing the drilled hole 2: after the probe to be tested reaches the designated area, the flexible pipe 11 is used for connecting and supplying the operating platform 13 and the drill rod 10, and flexible plugging medium 24 with certain pressure is provided for the interior of the test probe.
First, the first switch 14 of the supply console 13 is opened, the flexible plugging medium 24 passes through the communicating tube 8 and the collection tube 9, enters the type I plugging unit 4 and the type II plugging unit 5 through the corresponding fourth switch 38 and fifth switch 41, and inflates the first plugging capsule 40 and the second plugging capsule 27 to form the sealed cavity 6 and the collection cavity 7, respectively.
And continuously increasing the pressure of the flexible plugging medium 24, opening the side leakage valve 25, enabling the flexible plugging medium 24 to enter the sealed cavity 6 through the second small hole 36, filling the sealed cavity 6, and further filling rock mass cracks around the sealed cavity 6, wherein at the moment, the I-type plugging unit 4, the II-type plugging unit 5 and the sealed cavity 6 at the tail part of the test probe form triple drilling sealing, after the flow meter 16 on the operation table 13 is stable in indication, closing the first switch 14, opening the second switch 17, and clearing the flexible plugging medium 24 in the communicating pipe 8 and the collection pipe 9, so that the interior of the pipeline is kept smooth.
(4) And (3) pressure resistance test: and after hole sealing is finished, performing a pressure resistance test to test the hole sealing effect, and if the hole sealing is unqualified, performing closed drilling operation again.
(5) And (3) measuring gas parameters: connecting a collection operation platform 18, opening a third switch 19, enabling gas to enter a collection pipe 9 through a third small hole 31 of the collection pipe 9, enabling the gas to enter the collection operation platform 18 through a communicating pipe 8 and the like, reading the reading of a gas pressure gauge 20 after the gas pressure gauge 20 is stabilized, comparing the reading with the reading of an electronic pressure gauge 21, taking the average value of the two values under the condition that the two values are approximately equivalent, namely the value for displaying the gas pressure in a collection cavity 7, and finally carrying out component and content analysis on the gas collected into a collection tank 22.
Parts which are not described in the invention can be realized by adopting or referring to the prior art.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (9)
1. The observation method of the mine rock mass drilling gas plugging and extraction integrated system is characterized by comprising the following steps of:
step (1), drilling a gas extraction borehole: drilling holes to a coal seam of an appointed extraction area in a top plate coal rock mass or a bottom plate coal rock mass in a roadway according to a set angle by using a drilling machine;
mounting a test probe, connecting the test probe with a drill rod, and pushing the test probe to a specified extraction area by using a drilling machine; the test probe comprises a conical head, a II-type plugging unit and two I-type plugging units; the head part of the II-type plugging unit is connected with one I-type plugging unit through a collection pipe, and the tail part of the II-type plugging unit is provided with a side leakage valve and is connected with the other I-type plugging unit through a communicating pipe;
the I-type plugging unit comprises an I-type tubular joint, a first plugging capsule and a fourth switch, the fourth switch is arranged on one side of the I-type tubular joint in the circumferential direction, the first plugging capsule wraps the outer side of the I-type tubular joint, and a channel for containing plugging materials is arranged inside the I-type tubular joint;
the fourth switch comprises a cover cap and a first spring, one end of the cover cap is connected with the inner wall of the I-shaped tubular joint through the first spring, and the other end of the cover cap is arranged on the outer side of the I-shaped tubular joint;
the inner part of the cap is a cavity, and first small holes are formed in two sides of the cap; in a normal state, the cover cap is in a closed state under the action of the first spring, and the vertical plate happens to seal the first small hole; when the plugging material is filled, the cap is jacked upwards by the plugging material with certain pressure, a passage is formed between the inside of the I-shaped tubular joint and the first small hole, at the moment, the plugging material enters the cavities of the I-shaped tubular joint and the first plugging capsule through the first small hole, and the first plugging capsule expands;
step (3), sealing and drilling: after the test probe reaches a designated area, the test probe is connected with a supply console and a drill rod by a hose, and a flexible plugging medium with set pressure is provided for the test probe;
step (4) pressure resistance test: performing a pressure resistance test to test the hole sealing effect, and if the hole sealing is unqualified, repeating the step (3);
step (5), gas parameter determination: and connecting the test probe with a measurement system, and reading the readings of the gas pressure gauge after the gas pressure gauge in the measurement system is stable.
2. The observation method of the mining rock mass borehole gas plugging extraction integrated system according to claim 1, characterized in that in the step (2), impurities in the borehole are firstly cleaned, and then the cone head, the top I-shaped plugging unit, the collection pipe, the II-shaped plugging unit, the communicating pipe and the tail I-shaped plugging unit are sequentially connected.
3. The observation method of the mining rock mass drilling gas plugging and extraction integrated system according to claim 1, wherein in the step (3), the first switch of the supply operation platform is firstly opened, and the flexible plugging medium enters the I-type plugging unit and the II-type plugging unit through the communicating pipe and the collecting pipe, so that the I-type plugging unit and the II-type plugging unit expand to form a sealed cavity and a collecting cavity respectively;
continuously increasing the pressure of the flexible plugging medium, opening the side leakage valve, enabling the flexible plugging medium to enter the sealed cavity, filling the sealed cavity, and filling rock mass cracks around the sealed cavity; and after the flow representation number supplied to the operation table is stable, closing the first switch, opening the second switch, and removing the flexible plugging medium in the communicating pipe and the collecting pipe.
4. The observation method of the mining rock mass drilling gas plugging and extraction integrated system according to claim 1, characterized in that the measurement system comprises a collection tank, an electronic pressure gauge and a gas pressure gauge which are sequentially connected through a pipeline; a one-way stop valve is arranged on a pipeline between the collecting tank and the electronic pressure gauge, and a third switch is arranged on a pipeline connecting the gas pressure gauge and the test probe;
and (5) after the test probe is connected with the measuring system, opening the third switch, reading the reading of the gas pressure gauge after the gas pressure gauge is stable, comparing the reading with the reading of the electronic pressure gauge, and taking the average value of the readings of the gas pressure gauge and the electronic pressure gauge as the value of the gas pressure in the collecting cavity.
5. The observation method of the mining rock mass drilling gas plugging and extraction integrated system according to claim 1, wherein protruding portions are arranged at two ends of the I-shaped tubular joint, a groove is formed between the protruding portions, and a through hole for a fourth switch to pass through is formed in one side of the groove.
6. The observation method of the mining rock mass drilling gas plugging and extraction integrated system according to claim 5, wherein the cap is of a T-shaped structure, a cap external member is arranged on the inner side of the cap, the cap external member is fixed on the outer side of the through hole, and first small holes are formed in two sides of the cap external member;
when the first spring is in a free state, the cap seals the first small hole; the first spring is in a compressed state, the cover cap bounces, and the channel is communicated with a cavity between the first plugging capsule and the I-shaped tubular joint through the first small hole.
7. The observation method of the mining rock mass drilling gas plugging and extraction integrated system according to claim 1, wherein the II-type plugging unit comprises an II-type tubular joint, a second plugging capsule and a fifth switch, the fifth switch is arranged on one side of the II-type tubular joint in the circumferential direction, the second plugging capsule covers the outer side of the II-type tubular joint, and a channel for containing plugging materials is arranged inside the II-type tubular joint.
8. The observation method of the mining rock mass drilling gas plugging extraction integrated system according to claim 1, wherein the side leakage valve comprises a base pipe, a rubber ball, a second spring and an adjusting nut, wherein second small holes are symmetrically formed in the rear side of the inside of the base pipe along the axis, the rubber ball is arranged in each second small hole, the rear side of the rubber ball is in contact with one end of the second spring, and the other end of the second spring is in contact with the adjusting nut.
9. The observation method of the mining rock mass drilling gas plugging and extraction integrated system according to claim 8, wherein a plurality of third small holes are formed in the collection pipe, and two one-way sealing strips which are arranged oppositely are arranged in the third small holes; an opening facing the inner wall of the collecting pipe is formed between the two one-way sealing strips, gas enters the collecting pipe through the one-way sealing strips, and the one-way sealing strips prevent plugging materials from directly entering the drill hole through the third small hole.
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