CN114183136A - Coal seam drilling leakage point detection device and method - Google Patents
Coal seam drilling leakage point detection device and method Download PDFInfo
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- CN114183136A CN114183136A CN202111571261.5A CN202111571261A CN114183136A CN 114183136 A CN114183136 A CN 114183136A CN 202111571261 A CN202111571261 A CN 202111571261A CN 114183136 A CN114183136 A CN 114183136A
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- 238000005553 drilling Methods 0.000 title claims abstract description 70
- 239000003245 coal Substances 0.000 title claims abstract description 36
- 238000001514 detection method Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims description 12
- 238000005070 sampling Methods 0.000 claims abstract description 185
- 238000000605 extraction Methods 0.000 claims abstract description 142
- 238000007789 sealing Methods 0.000 claims abstract description 25
- 238000012544 monitoring process Methods 0.000 claims abstract description 10
- 238000005259 measurement Methods 0.000 claims abstract description 5
- 238000012360 testing method Methods 0.000 description 7
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/08—Obtaining fluid samples or testing fluids, in boreholes or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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Abstract
The invention relates to the field of coal mine gas extraction, in particular to a coal seam drilling leak source detection device which comprises a beam tube detector and a beam tube, wherein the beam tube is provided with at least 4 cores, the beam tube penetrates through a drilling hole sealing device, the outer end of the beam tube is connected with the beam tube detector through a beam tube hose, each core of the beam tube is provided with a gas sampling port at the tail end in the hole, a plurality of gas sampling ports are arranged in an extraction drilling hole at equal intervals from the hole bottom to the hole opening of the extraction drilling hole, gas acquired by each gas sampling port is conveyed to the beam tube detector through the beam tube, and the beam tube detector is used for monitoring and displaying the gas concentration and extraction negative pressure of a gas sample acquired by each gas sampling port. The device utilizes the multi-core beam tube to collect gas samples of a plurality of sampling measurement ports in the gas extraction drill hole in real time, and the position of a leakage point and the sealing quality of the drill hole can be measured by analyzing the change rule of gas concentration and extraction negative pressure according to the monitoring result of the multi-core beam tube. The invention further provides a coal seam drilling leak source detection method.
Description
Technical Field
The invention relates to the field of coal mine gas extraction, in particular to a coal seam drilling leakage point detection device and method.
Background
The number of high gas mines and outburst mines in coal mines in China is gradually increased, gas extraction has great significance for relieving coal mine gas accidents, and whether a leakage point exists in a drill hole directly influences the gas extraction effect. Gas leakage in the hole and gas leakage in the crack at the edge of the hole are main factors causing low gas extraction concentration, so that the verification of whether a leakage point exists in an extraction drill hole is very important. The traditional method for detecting leakage of a drilled hole is to manually sample and measure gas concentration and extraction negative pressure through a detection tube, so that time and labor are wasted, errors are large in the sampling process, and the measured related parameters of a gas sample are influenced to a certain degree.
Disclosure of Invention
In order to solve the problems, the invention designs a coal seam drilling hole leakage point detection device, which utilizes a multi-core beam tube to collect gas samples of a plurality of sampling measurement ports in a gas extraction drilling hole in real time, tests the gas concentration and extraction negative pressure of the collected gas samples, respectively corresponds to the plurality of sampling measurement ports of the drilling hole according to the monitoring result of the multi-core beam tube, and can measure the leakage point position and the sealing quality of the drilling hole by analyzing the change rule of the gas concentration and the extraction negative pressure. The manual testing and sampling are avoided, the accuracy and the real-time performance of the gas extraction drilling leakage point testing are improved, and the efficient extraction of the coal seam gas is guaranteed. The invention further provides a coal seam drilling leak source detection method.
In order to achieve the purpose, the invention adopts the technical scheme that:
in a first technical scheme, a coal seam drilling leak source detection device is used for measuring the position of an extraction drilling leak source in a coal seam, a drilling and hole sealing device is arranged at an orifice of an extraction drilling hole, an extraction pipe penetrates through the drilling and hole sealing device, a first end of the extraction pipe is arranged in the extraction drilling hole and close to the position of the orifice of the extraction drilling hole, the other end of the extraction pipe is communicated with an extraction main pipe, and the coal seam drilling leak source detection device comprises:
the beam tube detector is positioned outside the extraction drill hole;
the bundle pipe is provided with at least 4 cores, the bundle pipe penetrates through the drilling and hole sealing device, the outer end of the bundle pipe is connected with a bundle pipe detector through a bundle pipe hose, each core of the bundle pipe is provided with a gas sampling port at the inner tail end of the hole, the gas sampling ports are arranged in the extraction drill hole at equal intervals from the hole bottom to the hole opening of the extraction drill hole, gas acquired by each gas sampling port is conveyed to the bundle pipe detector through the bundle pipe, and the bundle pipe detector is used for monitoring and displaying the gas concentration and extraction negative pressure of a gas sample acquired by each gas sampling port.
In the first technical scheme, preferably, the extraction pipe is provided with a valve body.
In the first aspect, preferably, the plurality of gas sampling ports are arranged in a straight line.
In the first aspect, the bundle tube preferably has at least 4, 5, 7, 8, 10, 12 or 16 cores.
In a second technical scheme, the method for detecting the coal seam drilling missing point by using the device for detecting the coal seam drilling missing point in the first technical scheme comprises the following steps,
step 1, arranging a beam tube and a gas sampling port: on the basis of the hole length of an extraction drilled hole, n beam tube cores are arranged, a gas sampling port is arranged at the tail end of each beam tube core, a first gas sampling port is arranged at a unit distance away from the position of a drilling and hole sealing device, an nth gas sampling port is arranged at the bottom of the hole, and the rest gas sampling ports are arranged at equal intervals between the first gas sampling port and the nth gas sampling port;
step 2, starting the detection equipment: connecting the bundle pipe core with a bundle pipe detector through a bundle pipe hose, starting a bundle pipe monitor, and reading extraction negative pressure and gas extraction concentration corresponding to all gas sampling ports by the bundle pipe monitor;
step 3, judging the position of the missing point: when the gas concentration and the extraction negative pressure corresponding to the first gas sampling port to the mth gas sampling port have the trend of obviously reducing, and the gas concentration and the extraction negative pressure reduction amplitude corresponding to the mth gas sampling port are most obvious, the gas concentration and the extraction negative pressure reduction amplitude corresponding to the (m + 1) th gas sampling port are slightly lower than those of other gas sampling ports, and the sampled gas extraction concentration from the (m + 2) th gas sampling port to the nth gas sampling port is normal and is obviously reduced compared with the sampled gas extraction negative pressure in a normal state, judging that the mth gas sampling port is a leakage point;
when the gas concentration and the extraction negative pressure corresponding to the first gas sampling port to the mth gas sampling port have the trend of obviously reducing, the reduction range of the gas concentration and the extraction negative pressure corresponding to the (m-1) th gas sampling port and the mth gas sampling port is larger than that of other gas sampling ports, the sampling gas extraction concentration from the (m + 1) th gas sampling port to the nth gas sampling port is normal, and the sampling gas extraction negative pressure from the (m + 1) th gas sampling port to the nth gas sampling port is obviously reduced compared with that before, the leakage point is positioned between the m-1 th gas sampling port and the m-1 th gas sampling port, and if the gas concentration and the extraction negative pressure reduction amplitude corresponding to the m-1 th gas sampling port are larger than those corresponding to the m-1 th gas sampling port, the leakage point is close to the m-1 th gas sampling port; and if the gas concentration and the extraction negative pressure reduction amplitude corresponding to the (m-1) th gas sampling port are larger than those corresponding to the (m) th gas sampling port, the leakage point is close to the (m-1) th gas sampling port.
The beneficial effects of the invention are as follows:
the invention designs a coal seam drilling leakage point detection device in a negative pressure state, which utilizes a multi-core beam tube to collect gas samples of a plurality of sampling measurement ports in a gas extraction drilling hole in real time, tests the gas concentration and the extraction negative pressure of the collected gas samples, can monitor the information of a plurality of sampling points at the same time, reduces the section of the leakage point, increases the accuracy of the position judgment of the drilling leakage point, analyzes the gas concentration and the extraction negative pressure of the gas samples of the plurality of sampling points through a beam tube monitor, and finally judges the specific position of the drilling leakage point. The method avoids manual testing and sampling, improves the accuracy and real-time performance of the gas extraction drilling leakage point test, ensures the efficient extraction of the coal seam gas, can generate obvious economic and social benefits, and has wide application prospect in the aspect of drilling leakage point detection in high gas and outburst mines.
Drawings
Fig. 1 is a schematic diagram of a coal seam drilling leak source detection device and method in a certain mine negative pressure state.
The reference numerals include:
1-extraction drill hole, 2-coal seam, 3-bundle pipe, 4-extraction inner pipe, 5-gas sampling port, 6-drill hole sealing device, 7-extraction hose, 8-extraction main pipe, 9-bundle pipe hose, 10-bundle pipe detector, 11-control cabinet, 12-negative pressure pump, and 13-concentration and negative pressure display device.
Detailed Description
In order to make the purpose, technical solution and advantages of the present technical solution more clear, the present technical solution is further described in detail below with reference to specific embodiments. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present teachings.
Example 1
As shown in fig. 1, the embodiment provides a coal seam 2 drilling leakage point detection device for measuring a leakage point position of an extraction drilling hole 1 in a coal seam 2, a drilling hole sealing device 6 is arranged at an orifice of the extraction drilling hole 1, an extraction pipe penetrates through the drilling hole sealing device 6, a first end of the extraction pipe is arranged in the extraction drilling hole 1 and close to the orifice of the extraction drilling hole 1, the other end of the extraction pipe is communicated with an extraction main pipe 8, and the coal seam 2 drilling leakage point detection device comprises:
the beam tube detector 10 is positioned outside the extraction borehole 1; the bundle pipe 3, the bundle pipe 3 has 4 cores at least, the bundle pipe 3 passes drilling hole sealing device 6, the outer end of the bundle pipe 3 is connected with bundle pipe detector 10 through bundle pipe hose 9, each core of the bundle pipe 3 all has gas sample connection 5 at the downthehole end, and a plurality of gas sample connection 5 are arranged at equal intervals from the hole bottom of the extraction borehole 1 to the drill way in the extraction borehole 1, the gas that each gas sample connection 5 obtained is carried to the bundle pipe detector 10 through the bundle pipe 3, the bundle pipe detector 10 is used for monitoring and displaying the gas concentration and the extraction negative pressure that each gas sample connection 5 obtained the gas sample.
Preferably, the extraction pipe is provided with a valve body. The plurality of gas sampling ports 5 are arranged in a straight line. The bundle tube 3 has at least 4, 5, 7, 8, 10, 12 or 16 cores.
Example 2
The embodiment provides a method for detecting a coal seam 2 drilling leak source, which uses the device for detecting a coal seam 2 drilling leak source as in embodiment 1, and comprises the following steps,
step 1, arranging a beam tube 3 and a gas sampling port 5: on the basis of the hole length of the extraction drill hole 1, n bundle pipes 3 are arranged, a gas sampling port 5 is arranged at the tail end of each bundle pipe 3, a first gas sampling port 5 is arranged at a unit distance from the position of the drill hole sealing device 6, an nth gas sampling port 5 is arranged at the hole bottom, and the rest gas sampling ports 5 are arranged at equal intervals between the first gas sampling port 5 and the nth gas sampling port 5;
step 2, starting the detection equipment: connecting the core of the beam tube 3 with a beam tube detector 10 through a beam tube hose 9, starting a beam tube 3 monitor, and reading extraction negative pressure and gas extraction concentration corresponding to all gas sampling ports 5 by the beam tube 3 monitor;
step 3, judging the position of the missing point: when the gas concentration and the extraction negative pressure corresponding to the first gas sampling port 5 to the mth gas sampling port 5 have the trend of obviously reducing, and the gas concentration and the extraction negative pressure reducing amplitude corresponding to the mth gas sampling port 5 are most obvious, the gas concentration and the extraction negative pressure reducing amplitude corresponding to the m +1 th gas sampling port 5 are slightly lower than those of other gas sampling ports 5, and the sampled gas extraction concentration of the m +2 th gas sampling port 5 to the nth gas sampling port 5 is not changed normally and the sampled gas extraction negative pressure is obviously reduced compared with the normal state, the mth gas sampling port 5 is judged to be a leakage point;
when the gas concentration and the extraction negative pressure corresponding to the first gas sampling port 5 to the mth gas sampling port 5 have the tendency of obviously reducing, the reduction range of the gas concentration and the extraction negative pressure corresponding to the m-1 th gas sampling port 5 and the mth gas sampling port 5 is larger than that of other gas sampling ports 5, the sampling gas extraction concentration of the m +1 th gas sampling port 5 to the nth gas sampling port 5 is normal, and the sampling gas extraction negative pressure of the m +1 th gas sampling port 5 to the nth gas sampling port 5 is obviously reduced compared with that before, the leakage point is located between the m-1 th gas sampling port 5 and the m-th gas sampling port 5, if the gas concentration and the extraction negative pressure reduction amplitude corresponding to the mth gas sampling port 5 are larger than those corresponding to the m-1 th gas sampling port 5, the leakage point is close to the mth gas sampling port 5; if the gas concentration and the extraction negative pressure reduction amplitude corresponding to the m-1 th gas sampling port 5 are larger than those corresponding to the m-1 th gas sampling port 5, the leakage point is close to the m-1 th gas sampling port 5.
The device and the method for detecting the leakage point of the coal seam 2 drilled hole by using the device are described in detail below by taking the 8-core bundle pipe 3 as an example by combining the technical schemes of the embodiment 1 and the embodiment 2. The present invention is not limited to the 8-core bundle tube 3, and the bundle tube 3 may be, for example, 4, 5, 7, 8, 10, 12, 16, etc.
Example 3
Specifically, a well-constructed gas extraction borehole 1 is connected to an extraction main pipe 8 through an extraction hose 7, the extraction main pipe 8 is connected with an extraction system for extraction, under the condition that no leakage point exists in the borehole, the negative pressure linearly attenuates along with the increase of the depth of the borehole, and the gas extraction concentration is stable.
If a leakage point exists in the drill hole, an 8-core beam tube 3 is inserted into the extraction drill hole 1, and the connection of each beam tube 3 and a gas sampling port 5 corresponding to the beam tube 3 is ensured while the beam tube 1 is inserted. The 8-core beam tube 3 is finally connected with a beam tube 3 monitor at the orifice, and the concentration and the negative pressure of the sampled gas can be displayed by a concentration and negative pressure display device 13. The beam tube 3 monitor is started, the concentration and the negative pressure of the negative pressure display device 13 are adjusted to be consistent with the negative pressure of the orifice, and the sampling port of the beam tube 3 is connected with the beam tube 3 monitor. And analyzing the extraction concentration and negative pressure data of the gas sample at the sampling port of the 8-core beam tube 3 to obtain the leakage point position of the drill hole.
Specifically, the device for detecting the leakage point of the coal seam 2 in the negative pressure state belongs to a method for detecting the leakage point and the sealing property of the drill hole, and is used for detecting and plugging the leakage of the gas extraction drill hole 1 of a high gas mine and a outburst mine. Taking a drill hole in which a certain ore is being extracted as an example, when the gas extraction concentration of the drill hole is found to be low, leakage detection needs to be carried out on the gas extraction drill hole 1. Firstly, on the premise that an extraction main pipe 8 and an extraction pipe normally run, the positions of 8 sampling ports are theoretically calculated, taking a drill hole 48m as an example, a first gas sampling port 5 is arranged at a position 6m away from the inner side of a drilling and hole sealing device 6, a second gas sampling port 5 is arranged at a position 12m away from the inner side of the drilling and hole sealing device 6, a third gas sampling port 5 is arranged at a position 18m away from the inner side of the drilling and hole sealing device 6, a fourth gas sampling port 5 is arranged at a position 24m away from the inner side of the drilling and hole sealing device 6, a fifth gas sampling port 5 is arranged at a position 30m away from the inner side of the drilling and hole sealing device 6, a sixth gas sampling port 5 is arranged at a position 36m away from the inner side of the drilling and hole sealing device 6, a seventh gas sampling port 5 is arranged at a position 42m away from the inner side of the drilling and hole sealing device 6, and an eighth gas sampling port 5 is arranged at a position 48m away from the inner side of the drilling and hole sealing device 6, i.e. the bottom of the well. The extraction pipes in the embodiment are extraction inner pipes 4 and extraction hoses 7, and the extraction inner pipes 4 are connected with extraction main pipes 8 through the extraction hoses 7.
And dividing an 8-core beam tube 3 into 8 beam tubes 3 according to the preset length, burying the beam tubes 3 in the positions of corresponding sampling ports in the drill hole, wherein the port of each beam tube 3 is connected with a gas sampling port 5, and starting a beam tube 3 monitor, a control cabinet 11 and a negative pressure pump 12. The start and stop of each beam pipe 3 can be controlled by the control cabinet 1111, and the extraction negative pressure and the gas extraction concentration corresponding to each gas sampling port 5 can be read out by the concentration and negative pressure display device 13 of the monitor of the beam pipe 3.
By taking the fourth gas sampling port 5 as a leakage point for example, it can be seen through the negative pressure and concentration display device that the gas concentration and the extraction negative pressure corresponding to the beam pipes 3 connected to the first gas sampling port 5 to the beam pipes 3 connected to the fourth gas sampling port 5 have a trend of being obviously reduced, and the gas concentration and the extraction negative pressure corresponding to the beam pipes 3 connected to the fourth gas sampling port 5 have the most obvious reduction range. The beam pipe 3 connected with the fifth gas sampling port 5 is close to the beam pipe 3 connected with the fourth gas sampling port 5, so that the gas extraction concentration is slightly lower than the monitoring data of other beam pipes 3, the sampling gas extraction concentrations of the beam pipes 3 connected with the sixth gas sampling port 5 to the beam pipes 3 connected with the eighth gas sampling port 5 are normal and unchanged, but the sampling gas extraction negative pressure of the beam pipes 3 connected with the fifth gas sampling port 5 to the beam pipes 3 connected with the eighth gas sampling port 5 is obviously reduced compared with that before.
If the leak point of the drill hole is located before the two sampling points, the leak point between the fifth gas sampling port 5 and the sixth gas sampling port 5 is exemplified. According to the negative pressure and concentration display device, the gas concentration and the extraction negative pressure corresponding to the beam pipes 3 connected with the first gas sampling port 5 and the sixth gas sampling port 5 have the trend of obviously reducing, and the gas concentration and the extraction negative pressure corresponding to the beam pipes 3 connected with the fifth gas sampling port 5 and the sixth gas sampling port 5 have the obvious reduction range. If the position of the leakage point is close to the sixth gas sampling port 5, the reduction range of the sampling monitoring gas extraction concentration and the extraction negative pressure of the beam pipe 3 connected with the sixth gas sampling port 5 is larger than the sampling monitoring result (extraction concentration and extraction negative pressure) of the beam pipe 3 connected with the fifth gas sampling port 5, and vice versa. The sampling gas extraction concentration of the bundle pipe 3 connected with the seventh gas sampling port 5 and the sampling gas extraction concentration of the bundle pipe 3 connected with the eighth gas sampling port 5 are normal, but the sampling gas extraction negative pressure of the bundle pipe 3 connected with the seventh gas sampling port 5 and the sampling gas extraction negative pressure of the bundle pipe 3 connected with the eighth gas sampling port 5 are obviously reduced compared with the previous sampling gas extraction negative pressure.
After the test is finished, the specific position of the leakage point of the drilling hole is judged according to the monitoring data of the beam pipe 3 connected with the first gas sampling port 5 and the beam pipe 3 connected with the eighth gas sampling port 5.
In the embodiment, the extraction negative pressure and the extraction concentration of the gas extraction borehole 1 are monitored by sampling through the 8-core beam tube 3, the gas concentration and the extraction negative pressure of the general borehole leakage point and the section between the leakage point and the orifice are sharply reduced, the gas concentration of the section from the leakage point to the bottom of the hole is kept unchanged, and the extraction negative pressure is obviously reduced. 8 core beam pipe 3 divide into 8 sampling points, and 8 sampling point evenly distributed, can detect the information of 8 sampling points simultaneously, has reduced the district section of leak source, has increased the accuracy nature that the leak source position of drilling was judged, analyzes the gas concentration and the drainage negative pressure of the gas appearance of 8 sampling points through 3 monitors of beam pipe, finally judges the concrete position of drilling leak source.
The foregoing is only a preferred embodiment of the present invention, and many variations in the specific embodiments and applications of the invention may be made by those skilled in the art without departing from the spirit of the invention, which falls within the scope of the claims of this patent.
Claims (5)
1. The utility model provides a coal seam drilling leak source detection device for take out and adopt drilling leak source position in the measurement coal seam, the drill way department of taking out and adopting the drilling has drilling hole sealing device, and the pipe of taking out and adopting passes drilling hole sealing device, and the first end setting of pipe of taking out is close to and takes out and adopt drilling hole mouth position in taking out and adopting the drilling, and the other end is responsible for the intercommunication with taking out and adopting its characterized in that: coal seam drilling leak source detection device includes:
the beam tube detector is positioned outside the extraction drill hole;
the bundle pipe is provided with at least 4 cores, the bundle pipe penetrates through the drilling and hole sealing device, the outer end of the bundle pipe is connected with a bundle pipe detector through a bundle pipe hose, each core of the bundle pipe is provided with a gas sampling port at the inner tail end of the hole, the gas sampling ports are arranged in the extraction drill hole at equal intervals from the hole bottom to the hole opening of the extraction drill hole, gas acquired by each gas sampling port is conveyed to the bundle pipe detector through the bundle pipe, and the bundle pipe detector is used for monitoring and displaying the gas concentration and extraction negative pressure of a gas sample acquired by each gas sampling port.
2. The coal seam drilling leak source detection device of claim 1, characterized in that: and a valve body is arranged on the extraction pipe.
3. The coal seam drilling leak source detection device of claim 1, characterized in that: the gas sampling ports are arranged in a straight line.
4. The coal seam drilling leak source detection device of claim 1, characterized in that: the bundle has at least 4, 5, 7, 8, 10, 12, or 16 cores.
5. A method for detecting a coal seam drilling leak source by using the device for detecting a coal seam drilling leak source according to any one of claims 1-4, wherein: comprises the following steps of (a) carrying out,
step 1, arranging a beam tube and a gas sampling port: on the basis of the hole length of an extraction drilled hole, n beam tube cores are arranged, a gas sampling port is arranged at the tail end of each beam tube core, a first gas sampling port is arranged at a unit distance away from the position of a drilling and hole sealing device, an nth gas sampling port is arranged at the bottom of the hole, and the rest gas sampling ports are arranged at equal intervals between the first gas sampling port and the nth gas sampling port;
step 2, starting the detection equipment: connecting the bundle pipe core with a bundle pipe detector through a bundle pipe hose, starting a bundle pipe monitor, and reading extraction negative pressure and gas extraction concentration corresponding to all gas sampling ports by the bundle pipe monitor;
step 3, judging the position of the missing point: when the gas concentration and the extraction negative pressure corresponding to the first gas sampling port to the mth gas sampling port have the trend of obviously reducing, and the gas concentration and the extraction negative pressure reduction amplitude corresponding to the mth gas sampling port are most obvious, the gas concentration and the extraction negative pressure reduction amplitude corresponding to the (m + 1) th gas sampling port are slightly lower than those of other gas sampling ports, and the sampled gas extraction concentration from the (m + 2) th gas sampling port to the nth gas sampling port is normal and is obviously reduced compared with the sampled gas extraction negative pressure in a normal state, judging that the mth gas sampling port is a leakage point;
when the gas concentration and the extraction negative pressure corresponding to the first gas sampling port to the mth gas sampling port have the trend of obviously reducing, the reduction range of the gas concentration and the extraction negative pressure corresponding to the (m-1) th gas sampling port and the mth gas sampling port is larger than that of other gas sampling ports, the sampling gas extraction concentration from the (m + 1) th gas sampling port to the nth gas sampling port is normal, and the sampling gas extraction negative pressure from the (m + 1) th gas sampling port to the nth gas sampling port is obviously reduced compared with that before, the leakage point is positioned between the m-1 th gas sampling port and the m-1 th gas sampling port, and if the gas concentration and the extraction negative pressure reduction amplitude corresponding to the m-1 th gas sampling port are larger than those corresponding to the m-1 th gas sampling port, the leakage point is close to the m-1 th gas sampling port; and if the gas concentration and the extraction negative pressure reduction amplitude corresponding to the (m-1) th gas sampling port are larger than those corresponding to the (m) th gas sampling port, the leakage point is close to the (m-1) th gas sampling port.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115263245A (en) * | 2022-07-20 | 2022-11-01 | 安徽省皖北煤电集团有限责任公司 | Coal mine gas extraction drilling gas leakage detection positioning device |
| WO2023236631A1 (en) * | 2022-06-09 | 2023-12-14 | 中煤科工集团沈阳研究院有限公司 | Hole sealing quality measurement device and hole sealing quality evaluation method for gas extraction drilling |
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