CN111963150B - Coal bed gas pressure measuring device and using method - Google Patents
Coal bed gas pressure measuring device and using method Download PDFInfo
- Publication number
- CN111963150B CN111963150B CN202010880943.3A CN202010880943A CN111963150B CN 111963150 B CN111963150 B CN 111963150B CN 202010880943 A CN202010880943 A CN 202010880943A CN 111963150 B CN111963150 B CN 111963150B
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- Prior art keywords
- gas pressure
- pipe
- drilling
- optical fiber
- grouting
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
Abstract
The invention provides a coal seam gas pressure measuring device which comprises a gas pressure pipe, a first grouting pipe, a second grouting pipe and a deformation measuring system, wherein the gas pressure pipe, the first grouting pipe, the second grouting pipe and the deformation measuring system are arranged in a drill hole; the front end of the gas pressure pipe is provided with a gas pressure gauge. The invention also provides a using method of the coal bed gas pressure measuring device. The invention monitors the damage condition of the drilling cement slurry through the optical fiber demodulator; when the damage of the drilling hole is monitored, the method and the device fill in the solidified cement slurry cracks in the drilling hole under the influence of mining through grouting for multiple times, so that the integrity and the tightness of the cement slurry in the drilling hole are ensured, and more accurate gas pressure can be obtained.
Description
Technical Field
The invention relates to the technical field of coal mining, in particular to a coal seam gas pressure measuring device and a using method thereof.
Background
Mine disasters, especially gas dynamic disasters, are the most severe. The gas pressure is one of important indexes for predicting and evaluating the gas disasters, and the accurate measurement of the gas pressure of the coal bed is particularly important. At present, due to the influence of mining, surrounding rock of a drill hole is damaged, cracks are generated, gas leaks, deviation between a measured value and an actual value is often caused, and the accuracy of a measured result is seriously influenced.
Based on the above, there is an urgent need for a coal seam gas pressure measurement device with accurate test results and small errors and a use method thereof.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a coal seam gas pressure measuring device and a using method thereof, which timely fill rock cracks under the influence of mining through multiple grouting, and improve the accuracy of gas pressure measurement.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
the utility model provides a coal seam gas pressure survey device, relates to the drilling, including installing gas pressure pipe, first slip casting pipe, second benefit thick liquid pipe and the deformation measurement system in the drilling, first slip casting pipe is used for injecting cement slurry into the drilling and seals the drilling and form gas enrichment space, deformation measurement system is used for monitoring the drilling surrounding rock destruction condition in the mining process, when deformation measurement system monitors the drilling surrounding rock destruction condition, mends the injection cement slurry into the drilling through second benefit thick liquid pipe; the front end of the gas pressure pipe is provided with a gas pressure gauge.
Further, the tail end of the gas pressure pipe is designed into a screen pipe, and the screen pipe section is positioned in the gas enrichment space.
Further, a plurality of grouting holes are uniformly formed in the second slurry supplementing pipe, located in the drilling hole, in the direction along the drilling hole.
Further, the tail end of the second slurry supplementing pipe is sealed through a film.
Further, the second slurry supplementing pipe is positioned above the inside of the drilled hole.
Further, the deformation measurement system comprises an optical fiber and an optical fiber demodulator, wherein the optical fiber is tightly coupled with cement paste and used for coordinating deformation, and the optical fiber is connected with the optical fiber demodulator through a connecting wire.
Further, the sealing device also comprises a sealing plug, wherein the sealing plug acts on the front end of the second slurry supplementing pipe for sealing.
Further, the gas-enriched space filling device further comprises cotton yarns, polyurethane and baffles, wherein the cotton yarns, the polyurethane and the baffles are used for grouting and plugging to prevent cement paste from entering the gas-enriched space.
In order to achieve the above purpose, the invention also provides a using method of the coal seam gas pressure measuring device, which comprises the following steps:
s1, drilling is carried out, and a gas pressure pipe, a first grouting pipe, a second grouting pipe, optical fibers, cotton yarns, polyurethane and a baffle are arranged in the drilling;
s2, injecting cement paste into the drilled hole through the first grouting pipe, and sealing the drilled hole through polyurethane, cotton yarn and a baffle plate to form a gas enrichment space;
s3, installing a gas pressure gauge at the tail end of the gas pressure pipe;
s4, connecting the optical fiber with an optical fiber demodulator, and observing the damage condition of the drilling cement slurry in real time in the mining process;
s5, when the drilling cement paste is damaged, the cement paste is timely filled into the drilling hole through the second paste filling pipe, so that the sealing performance of the drilling hole and the accuracy of gas pressure measurement are guaranteed.
The beneficial effects are that: the deformation of the optical fiber is known through the optical fiber demodulator, so that the damage condition of the drilling cement paste is monitored; when the damage of the drilling hole is monitored, the method and the device fill in the solidified cement slurry cracks in the drilling hole under the influence of mining through grouting for multiple times, so that the integrity and the tightness of the cement slurry in the drilling hole are ensured, and more accurate gas pressure can be obtained.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
fig. 1 is a schematic structural diagram of a coal seam gas pressure measurement device according to an embodiment of the invention.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The invention will be described in detail below with reference to the drawings in connection with embodiments.
Example 1
See fig. 1: the utility model provides a coal seam gas pressure survey device, relates to drilling 1, including installing gas pressure pipe 2, first slip casting pipe 3, second benefit thick liquid pipe 4 and the deformation measurement system in drilling 1, first slip casting pipe 3 is used for injecting cement thick liquid 5 sealed drilling 1 to drilling 1 in and forms gas enrichment space 6, deformation measurement system is used for monitoring drilling 1 grout destruction condition in the mining process, when deformation measurement system detects drilling 1 grout destruction condition, mends the injection thick liquid 5 in the drilling 1 through second benefit thick liquid pipe 4; the tail end of the gas pressure pipe 2 is provided with a gas pressure gauge 7.
According to the embodiment, the tightness of the drilled hole is guaranteed through the deformation measurement system and the second grouting pipe, so that the measurement accuracy of the gas pressure is guaranteed; the gas pressure gauge of the embodiment can read accurate gas pressure data under the condition that the deformation measurement system does not monitor the damage of the drilling cement paste or read accurate gas pressure data again after the second paste filling pipe is used for filling the drilling cement paste.
In addition, it should be noted that, the gas pressure gauge reading of this embodiment is gradually increased and stabilized over time, and the reading can be stabilized for one month in general, if the middle pressure gauge reading is reduced, the drilling gas leakage can also be indirectly indicated, and at this time, the cement paste can be supplemented through the second slurry supplementing pipe, so that the pressure gauge reading continues to increase until the pressure gauge reading is stabilized.
In a specific example, the end of the gas pressure pipe 2 is designed as a screen 201, and the section of the screen 201 is located in the gas enrichment space 6.
The sieve tube is provided with a plurality of air holes, so that coal slag can be prevented from entering and blocking, gas can be communicated with the gas pressure tube more quickly, and the measured pressure is more accurate.
Preferably, the second slurry compensating pipe 4 is provided with a plurality of grouting holes 401 uniformly along the direction of the drilling hole inside the drilling hole 1.
The second slurry supplementing pipe of the embodiment ensures the slurry supplementing requirements of all depth positions through the uniform grouting holes along the drilling direction, and can effectively supplement slurry when all depths are damaged.
Preferably, the end of the second slurry replenishing pipe 4 is sealed by a film 402.
According to the embodiment, cement paste can be prevented from entering the second paste supplementing pipe when the first paste supplementing pipe is used for grouting; in addition, the film can be easily broken when the second slurry supplementing pipe is used for supplementing slurry.
Preferably, the second slurry supplementing pipe 4 is located above the inside of the borehole 1.
Because of the action of gravity, the second slurry supplementing pipe of the embodiment is positioned above the drilling hole and can better supplement slurry, so that the slurry supplementing efficiency is improved and the slurry supplementing action range is improved.
Specifically, the deformation measurement system comprises an optical fiber 8 and an optical fiber demodulator 9, wherein the optical fiber 8 is tightly coupled with the cement paste 5 for coordinating deformation, and the optical fiber 8 is connected with the optical fiber demodulator 9 through a connecting wire.
In the embodiment, the deformation of the optical fiber is measured through the optical fiber demodulator, so that the damage condition of surrounding rock of the drilling hole is monitored.
Preferably, a sealing plug 10 is further included, and the sealing plug 10 acts on the front end of the second slurry supplementing pipe 4 for sealing.
In a specific example, the gas enrichment space 6 is further provided with cotton yarn and polyurethane 11 and a baffle 12, wherein the cotton yarn and polyurethane 11 and the baffle 12 are used for grouting and plugging to prevent cement paste 5 from entering the gas enrichment space 6.
According to the embodiment, the gas enrichment space can be ensured to be communicated with the gas pressure pipe only, gas leakage is prevented, and the accuracy of gas pressure measurement is improved.
Example 2
In order to achieve the above object, this embodiment further provides a method for using a coal seam gas pressure measurement device, including the following steps:
s1, drilling is carried out, and a gas pressure pipe, a first grouting pipe, a second grouting pipe, optical fibers, cotton yarns, polyurethane and a baffle are arranged in the drilling;
s2, injecting cement paste into the drilled hole through the first grouting pipe, and sealing the drilled hole through polyurethane, cotton yarn and a baffle plate to form a gas enrichment space;
s3, installing a gas pressure gauge at the tail end of the gas pressure pipe;
s4, connecting the optical fiber with an optical fiber demodulator, and observing the damage condition of the drilling cement slurry in real time in the mining process;
s5, when the drilling cement paste is damaged, the cement paste is timely filled into the drilling hole through the second paste filling pipe, so that the sealing performance of the drilling hole and the accuracy of gas pressure measurement are guaranteed.
According to the embodiment, through grouting for multiple times, the solidified cement slurry cracks in the drill holes under the influence of mining are filled in time, the integrity and the tightness of the drill hole cement slurry are guaranteed, and therefore more accurate gas pressure can be obtained. .
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (8)
1. The using method of the coal seam gas pressure measuring device relates to a drilling hole (1), and is characterized in that the measuring device comprises a gas pressure pipe (2), a first grouting pipe (3), a second grouting pipe (4) and a deformation measuring system which are arranged in the drilling hole (1), wherein the first grouting pipe (3) is used for injecting cement slurry (5) into the drilling hole (1) to seal the drilling hole (1) to form a gas enrichment space (6), the deformation measuring system is used for monitoring the damage condition of cement slurry in the drilling hole (1) in the mining process, and when the deformation measuring system monitors the damage condition of cement slurry in the drilling hole (1), the cement slurry (5) is filled into the drilling hole (1) through the second grouting pipe (4); the front end of the gas pressure pipe (2) is provided with a gas pressure gauge (7);
the using method comprises the following steps:
s1, drilling is carried out, and a gas pressure pipe, a first grouting pipe, a second grouting pipe, optical fibers, cotton yarns, polyurethane and a baffle are arranged in the drilling;
s2, injecting cement paste into the drilled hole through the first grouting pipe, and sealing the drilled hole through polyurethane, cotton yarn and a baffle plate to form a gas enrichment space;
s3, installing a gas pressure gauge at the tail end of the gas pressure pipe;
s4, connecting the optical fiber with an optical fiber demodulator, and observing the damage condition of the drilling cement slurry in real time in the mining process;
s5, when the drilling cement paste is damaged, the cement paste is timely filled into the drilling hole through the second paste filling pipe, so that the sealing performance of the drilling hole and the accuracy of gas pressure measurement are guaranteed.
2. The method for using the coal seam gas pressure measuring device according to claim 1, wherein the tail end of the gas pressure pipe (2) is designed into a screen pipe (201), and the section of the screen pipe (201) is positioned in the gas enrichment space (6).
3. The method for using the coal seam gas pressure measurement device according to claim 1, wherein a plurality of grouting holes (401) are uniformly formed in the second slurry supplementing pipe (4) along the direction of the drilled hole and are positioned in the drilled hole (1).
4. The method of using a coalbed methane pressure measurement device according to claim 1, characterized in that the end of the second slurry replenishing pipe (4) is sealed by a membrane (402).
5. The method of using a coal seam gas pressure measurement device according to claim 1, wherein the second slurry replenishing pipe (4) is located above the inside of the borehole (1).
6. The method for using the coalbed methane pressure measurement device according to claim 1, wherein the deformation measurement system comprises an optical fiber (8) and an optical fiber demodulator (9), the optical fiber (8) is tightly coupled with the cement paste (5) for coordinating deformation, and the optical fiber (8) is connected with the optical fiber demodulator (9) through a connecting wire.
7. The method of using a coal seam gas pressure measurement device according to claim 1, further comprising a plug (10), the plug (10) acting on the front end of the second slurry replenishing pipe (4) for sealing.
8. The method for using the coal seam gas pressure measurement device according to claim 1, further comprising cotton yarn and polyurethane (11) and a baffle (12), wherein the cotton yarn and polyurethane (11) and the baffle (12) are used for grouting and plugging, and blocking cement paste (5) from entering the gas enrichment space (6).
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| CN202010880943.3A CN111963150B (en) | 2020-08-27 | 2020-08-27 | Coal bed gas pressure measuring device and using method |
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| CN202010880943.3A CN111963150B (en) | 2020-08-27 | 2020-08-27 | Coal bed gas pressure measuring device and using method |
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| CN111963150A CN111963150A (en) | 2020-11-20 |
| CN111963150B true CN111963150B (en) | 2023-08-22 |
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| CN114607361B (en) * | 2022-03-24 | 2022-11-18 | 安徽理工大学 | Method for simultaneously measuring gas pressure of close-distance coal seam group |
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