CN117127967A - System and method for detecting coal seam drilling gas extraction leakage point - Google Patents
System and method for detecting coal seam drilling gas extraction leakage point Download PDFInfo
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- 238000000605 extraction Methods 0.000 title claims abstract description 218
- 238000005553 drilling Methods 0.000 title claims abstract description 128
- 239000003245 coal Substances 0.000 title claims abstract description 36
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- 230000000903 blocking effect Effects 0.000 claims description 3
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- 238000005086 pumping Methods 0.000 claims description 3
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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
- E21B47/00—Survey of boreholes or wells
- E21B47/10—Locating fluid leaks, intrusions or movements
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/006—Production of coal-bed methane
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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
- 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
- E21B49/086—Withdrawing samples at the surface
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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
- E21B49/087—Well testing, e.g. testing for reservoir productivity or formation parameters
- E21B49/0875—Well testing, e.g. testing for reservoir productivity or formation parameters determining specific fluid parameters
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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
- E21B49/087—Well testing, e.g. testing for reservoir productivity or formation parameters
- E21B49/088—Well testing, e.g. testing for reservoir productivity or formation parameters combined with sampling
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Abstract
The invention relates to a coal seam drilling gas extraction leakage point detection system and a detection method, wherein the system comprises an extraction drilling hole, a first end of a main extraction pipe penetrates through a hole sealing device and extends into the extraction drilling hole, a second end of the main extraction pipe is arranged outside the extraction drilling hole and is respectively connected with a first gas collecting pipeline and a second gas collecting pipeline, N detection points are uniformly arranged in the extraction drilling hole at equal intervals along the length direction of the drilling hole, a plurality of sampling holes are uniformly formed in the surface of the extraction drilling hole, sampled Kong Caiji gas is conveyed into the second gas collecting pipeline through the main extraction pipe, an extraction probe pipe penetrates through the main extraction pipe, a top sieve pore is formed in a pipe orifice of the extraction probe pipe, and the extraction probe pipe is conveyed into the first gas collecting pipeline.
Description
Technical Field
The invention relates to the technical field of mine goaf monitoring equipment, in particular to a detection system and a detection method for coal seam drilling gas extraction leakage points.
Background
The number of high-gas mines and protruding mines in coal mines in China is gradually increased, gas extraction is of great significance to relieving coal mine gas accidents, and whether holes are leaked directly influences gas extraction effects. The leakage of the holes and Kong Bianlie gap leakage are main factors which lead to low gas extraction concentration, so that it is important to verify whether the extraction drilling holes have leakage points. The traditional drilling leakage detection method is that the gas concentration and the extraction negative pressure are measured by manually sampling through the detection tube, so that time and labor are wasted, errors in the sampling process are large, and measured gas sample related parameters are affected to a certain extent. Therefore, we propose a system and a method for detecting the leakage point of coal seam drilling gas extraction to solve the above problems.
Disclosure of Invention
In order to solve the technical problems in the background art, the invention provides a detection system and a detection method for a coal seam drilling gas extraction leakage point.
The invention adopts the following technical scheme: a coal seam drilling gas extraction leakage point detection system, which comprises an extraction drilling hole drilled on a coal seam,
a hole sealing device is arranged at the orifice of the extraction drilling hole;
the first end of the extraction main pipe passes through the hole sealing device and extends into the extraction drilling hole, and the pipe orifice of the first end is in a blocking state;
the second end of the extraction main pipe is arranged outside the extraction drilling hole, and the second end is respectively connected with the first gas collecting pipeline and the second gas collecting pipeline;
the first gas collecting pipeline is connected to a first branch of the extraction main pipe;
the second gas collecting pipeline is connected to a second branch of the extraction main pipe;
the second branch is positioned at the front end of the first branch;
n detection points are arranged in the extraction drilling hole at equal intervals in the length direction of the drilling hole, wherein N is greater than or equal to 4;
the part of the extraction main pipe positioned in the extraction drilling hole is divided into a plurality of sampling areas according to the N detection points;
the surface of the extraction drilling hole positioned in the sampling area is uniformly provided with a plurality of sampling holes, and the plurality of sampling holes are used for collecting the gas in the corresponding sampling area and are conveyed into the second gas collecting pipeline through the extraction main pipe;
a extraction probe tube is arranged in the extraction main tube in a penetrating way;
one end of the extraction probe pipe positioned in the extraction drilling hole extends to a pipe orifice of the first end of the extraction main pipe and penetrates out of the end;
one end of the extraction probe pipe, which is positioned outside the extraction drilling hole, extends to the first branch;
the extraction probe pipe is positioned at a pipe orifice in the extraction drilling hole, is provided with a top sieve pore and is used for collecting gas near a corresponding detection point and is conveyed into a first gas collecting pipeline through the extraction probe pipe;
the first gas collecting pipeline is connected with a first gas measuring port;
the second gas collecting pipeline is connected with a second gas measuring port;
the first gas measuring port and the second gas measuring port are used for comparing the gas sample acquired by each pipeline and the gas concentration monitored and displayed by the concentration detector;
the tail ends of the first gas collecting pipeline and the second gas collecting pipeline are converged to an extension pipe;
the front end of the extension pipe is communicated with the extraction collection flow pipe.
Further, the first gas collecting pipe is connected with a concentration valve.
Further, the second gas collecting pipeline is connected with a flow detection unit for detecting gas flow of a gas leakage point in the extraction drilling hole.
Further, the flow detection unit comprises a water drain device, an air inlet flow increasing port, a flow valve and a flow meter which are sequentially connected along the length direction of the second gas collecting pipeline.
Further, the flow detection unit further comprises a protection valve and a check valve which are sequentially connected to the second gas collecting pipeline; the protection valve and the check valve are connected to the rear end of the flowmeter.
Further, a probe plug is arranged at one end part of the extraction probe outside the extraction drilling hole.
Further, a third air measuring port and a single-hole main valve are arranged on the extension pipe.
The invention further provides a detection method for detecting the leakage point based on the coal seam drilling gas extraction leakage point detection system, which comprises the following steps:
s100, arranging extraction drilling holes; installing a main extraction pipe, an extraction probe pipe, a first gas collecting pipeline and a second gas collecting pipeline; plugging the hole opening of the extraction drilling hole; inserting the extraction main pipe into the extraction drilling hole;
s200, acquiring image information of the extraction drilling hole, marking N detection points at equal intervals on the basis of the hole length of the extraction drilling hole, and sequentially sequencing the N detection points into 1, 2, 3 … …, N-1 and N detection points, wherein N is more than or equal to 4;
s300, extending the extraction main pipe to an N-number detection point, taking the N-number detection point as an initial detection point, extracting a detection gas sample in a sampling area of the initial detection point through a top sieve pore of the extraction probe pipe, collecting the detection gas sample to a first gas collecting pipeline, and detecting the concentration of gas in the detection gas sample through a first gas detecting port;
the sampling holes uniformly distributed on the extraction main pipe extract the comparative gas samples in sampling areas of detection points 1, 2, 3 and … …, N-1 and N, collect the comparative gas samples to a second gas collecting pipeline, and detect the gas concentration in the comparative gas sample through a second gas detecting port;
s400, sampling for multiple times, and carrying out fitting calculation on the data to obtain a gas concentration average value C1 in the detected gas sample and a gas concentration average value C2 in the comparison gas sample;
s500, comparing the C1 with the C2, and judging whether the N detection point is a target leakage point;
if C1=C2, the extraction borehole has no target leakage point or N number detection point is the leakage point;
at this time, the concentration of the detected gas sample collected by the first gas collecting pipeline is compared with a preset standard gas concentration threshold range, and if the concentration of the detected gas sample is lower than the standard gas concentration threshold range, the N-th detection point is the target leakage point. Otherwise, no target leakage point exists in the extraction drilling hole;
further, in the step S500, if C1 > C2, the detection points 1, 2, 3 … … N-1 have the target leak point in the sampling area, and then continue to perform halving until the target leak point is found, including the following steps:
s501, taking the intermediate points of 1, 2, 3 … … N-1 and N detection points (6)The number detection point is used as a secondary detection point, a top sieve pore (11) of the extraction probe tube (10) extracts a detection gas sample in a sampling area of the secondary detection point, and the detection gas sample is collected to a first gas collecting pipeline (4) and the gas concentration in the gas sample is detected through a first gas detection port (12);
s502, sampling for multiple times, and carrying out fitting calculation on the data to obtain a gas concentration average value C11 in the detected gas sample;
if C11=C2, the sampling area above the secondary detection point in the extraction drilling hole (1) is provided with a target leakage point, and then the sampling area above the corresponding serial number of the secondary detection point is continued to be divided into two parts until the target leakage point is found;
if C1 is more than C2, the sampling area below the secondary detection point in the extraction drilling hole (1) contains the target leakage point, and the two parts are continued to be carried out on the area below the corresponding serial number of the secondary detection point until the target leakage point is found.
Further, the method also comprises the following steps:
and S600, after the target leakage point is found, closing the first gas collecting pipeline, and enabling the gas in the extraction drilling hole to flow out through the second gas collecting pipeline, wherein the gas is used for detecting the gas flow of the leakage point through the flow detection unit.
Compared with the prior art, the invention has the advantages that: according to the coal seam drilling gas extraction leakage point detection system, the extraction drilling hole is divided into N detection points, each detection point is located in a corresponding sampling area, gas near the detection point is extracted through the extraction probe tube, the concentration of the gas in the whole extraction drilling hole is collected through the sampling hole on the extraction main tube, and the gas concentration are compared to obtain the target leakage point. The system can accurately monitor the information of a plurality of detection points in the extraction drilling hole, increases the accuracy of judging the positions of the leakage points in the drilling hole, and finally judges the specific positions of the leakage points in the drilling hole by analyzing the gas concentration of the gas sample of the detection points and the concentration in the whole extraction drilling hole in a step-by-step mode. The manual test sampling is avoided, the accuracy and the instantaneity of the gas extraction drilling leakage point test are improved, the efficient extraction of coal seam gas is ensured, and obvious economic and social benefits can be generated.
In addition, the invention also provides a coal seam drilling gas extraction leakage point detection method based on the detection system, and the target leakage point in the extraction drilling hole is searched by combining a dichotomy, so that a target area can be quickly found, the searching time is saved, and the searching efficiency is improved.
Drawings
FIG. 1 is an overall schematic diagram of a coal seam drilling gas extraction leak detection system according to the present invention;
FIG. 2 is a schematic diagram illustrating an embodiment of a system for detecting a gas drainage leak in a coal seam borehole according to the present invention;
fig. 3 is a flowchart of a method for detecting a coal seam drilling gas extraction leakage point according to the present invention.
Wherein:
1-extracting and drilling; 2-hole sealing device; 3-extracting a main pipe; 4-a first gas collecting pipeline; 5-a second gas collecting pipeline; 6-detecting points; 7-sampling area; 8-a single-hole main valve; 9-sampling holes; 10-extracting a probe tube; 11-top mesh; 12-a first gas measuring port; 13-a second gas port; 14-extending the tube; 15-pumping the collection flow tube; 16-concentration valve; 17-a water drainer; 18-an air inlet flow increasing port; 19-a flow valve; 20-a flow meter; 21-a protection valve; 22-check valve; 23-third gas measuring port.
Detailed Description
In the following, in order to facilitate the understanding of the technical solutions of the present invention by a person skilled in the art, reference will be made to the accompanying drawings for further description. It should be understood that the description is only illustrative and is not intended to limit the scope of the invention.
In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the invention. It may be evident, however, that one or more embodiments may be practiced without these specific details. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present invention.
Embodiment one:
referring to fig. 1, an overall schematic diagram of a coal seam drilling gas extraction leakage point detection system according to the present invention includes an extraction drilling hole 1 drilled in a coal seam, wherein the extraction drilling hole 1 is inclined obliquely above the coal seam. It should be noted that, in general, if no leak exists in the extraction borehole 1, the gas concentration in the extraction borehole 1 is kept substantially uniform throughout the respective range due to the movement of the internal gas flow.
The hole opening of the extraction drilling hole 1 is provided with a hole sealing device 2. The first end of the extraction main pipe 3 passes through the hole sealing device 2 and extends into the extraction drilling hole 1, and the pipe orifice of the first end is in a blocking state. The second end of the extraction main pipe 3 is arranged outside the extraction drilling hole 1, and the second end is respectively connected with the first gas collecting pipeline 4 and the second gas collecting pipeline 5. The first gas collecting pipeline 4 is connected to a first branch of the extraction main pipe 3, and the second gas collecting pipeline 5 is connected to a second branch of the extraction main pipe 3. The second branch is positioned at the front end of the first branch. N detection points 6 are arranged in the extraction drilling hole 1 at equal intervals along the length direction of the drilling hole, and are orderly sequenced from the No. 1 detection point to the N detection point from the orifice into the drilling hole. N is 4 or more. The part of the extraction main pipe 3 positioned in the extraction drilling hole 1 is divided into a plurality of sampling areas 7 according to N detection points 6. The surface of the extraction drilling hole 1 positioned in the sampling area 7 is uniformly provided with a plurality of sampling holes 9, and the plurality of sampling holes 9 are used for collecting the gas in the corresponding sampling area 7 and are conveyed into the second gas collecting pipeline 5 through the extraction main pipe 3. The extraction probe pipe 10 is penetrated in the extraction main pipe 3, and one end of the extraction probe pipe 10 positioned in the extraction drilling hole 1 extends to the pipe orifice of the first end of the extraction main pipe 3 and penetrates out from the end. One end of the extraction probe pipe 10, which is positioned outside the extraction drilling hole 1, extends to the first branch, and a top sieve hole 11 is arranged at the pipe orifice of the extraction probe pipe 10, which is positioned in the extraction drilling hole 1, and is used for collecting gas near the corresponding detection point 6 and conveying the gas into the first gas collecting pipeline 4 through the extraction probe pipe 10. Therefore, the extraction system can be used for respectively collecting the gas concentration near the detection point and the gas concentration of the whole in the extraction drilling hole in two ways.
In this embodiment, the first gas collecting pipeline 4 is connected with the first gas measuring port 12, the second gas collecting pipeline 5 is connected with the second gas measuring port 13, and the first gas measuring port 12 and the second gas measuring port 13 are used for comparing gas samples collected by each pipeline and monitoring and displaying the gas concentration through the concentration detector. The tail ends of the first gas collecting pipeline 4 and the second gas collecting pipeline 5 are converged to an extension pipe 14, and the front end of the extension pipe 14 is communicated with a pumping and collecting flow pipe 15 and used for carrying the pumped gas in a centralized manner.
As shown in fig. 1, a total of 9 detection points are set, assuming that the leak point is within the sampling area where the detection point 6 is located.
Firstly, the extraction main pipe 3 extends to a No. 9 detection point at the innermost side of an extraction drilling hole, and gas sucked by a top sieve hole 11 of the extraction probe rod 10 comes from a sampling area of the No. 9 detection point, namely, gas collected in the first gas collecting pipeline 4 only comes from a sampling area of the No. 9 detection point. And because the whole flow direction of the gas in the extraction drilling hole is from top to bottom, namely, the gas is gathered from the No. 9 detection point to the No. 1 detection point, the air permeated by the No. 6 detection point cannot flow back to the No. 9 detection point, but can flow downwards. Thus, the gas sucked in by the sampling holes 9 on the extraction main pipe 3 comes from the collection of the gas in all sampling areas from the detection point 9 to the detection point 1, namely, the gas collected in the second gas collecting pipeline 5 comes from the collection of the gas in all sampling areas from the detection point 9 to the detection point 1.
At this time, the average value of the gas concentration of the detected gas obtained in the first gas collecting pipeline 4 is c1, and the average value of the gas concentration of the detected gas obtained in the second gas collecting pipeline 5 is c2, and at this time, the value of c2 is diluted by the air overflowed from the air leakage point because the 6 th detection point is the leakage point, and the situation that c1 > c2 is necessarily occurred.
Then, the extraction main pipe 3 is extended to the No. 8 detection point, and the gas sucked by the top sieve holes 11 of the extraction probe rod 10 comes from the sampling area where the No. 9 detection point and the No. 8 detection point are located because the whole gas flow direction in the extraction drilling hole flows from top to bottom. I.e. the gas collected in the first gas collecting pipeline 4 comes only from the sampling area where the detection points No. 9 and No. 8 are located. And because the whole flow direction of the gas in the extraction drilling hole is from top to bottom, namely from the detection point 9 to the detection point 1, the air permeated by the detection point 6 cannot flow back to the detection point 9 and the detection point 8, but can flow downwards, so that the gas sucked by the sampling hole 9 on the extraction main pipe 3 comes from the collection of the gas in all the sampling areas from the detection point 9 to the detection point 1, namely the gas collected in the second gas collecting pipeline 5 comes from the collection of the gas in all the sampling areas from the detection point 9 to the detection point 1.
At this time, the average value of the gas concentration of the detected gas obtained in the first gas collecting pipeline 4 is c11, and the average value of the gas concentration of the gas obtained in the second gas collecting pipeline 5 is c2 after sampling for multiple times and fitting calculation and error judgment are performed on the data, and at this time, the value of c2 is diluted by the air overflowed from the air leakage point because the 6 # detection point is the leakage point, so that the situation that c11 is greater than c2 is necessarily caused.
When the extraction main pipe 3 extends to the No. 6 detection point, the gas collected in the first gas collecting pipeline 4 only comes from the sampling area from the No. 9 detection point to the No. 6 detection point, and the gas collected in the second gas collecting pipeline 5 comes from the collection of the gas in all the sampling areas from the No. 9 detection point to the No. 1 detection point. At this time, because the air in the leak is simultaneously drawn out from the first gas collecting pipe 4 and the second gas collecting pipe 4 due to the leak, the average value of the detected gas concentration obtained in the first gas collecting pipe 4 is c12, and the gas concentrations drawn by the two parts are nearly identical, that is, c12=c2.
At this time, it can be basically confirmed that the leak in the extraction borehole 1 is in the sampling area where the No. 6 detection point is located.
In summary, in the coal seam drilling gas extraction leakage point detection system designed by the invention, the extraction drilling hole is divided into N detection points, each detection point is positioned in a corresponding sampling area, gas near the detection point is extracted through the extraction probe pipe, the gas concentration in the whole extraction drilling hole is collected through the sampling hole on the extraction main pipe, and the gas concentration are compared to obtain the target leakage point. The system can accurately monitor the information of a plurality of detection points in the extraction drilling hole, increases the accuracy of judging the positions of the leakage points in the drilling hole, and finally judges the specific positions of the leakage points in the drilling hole by analyzing the gas concentration of the gas sample of the detection points and the concentration in the whole extraction drilling hole in a step-by-step mode. The manual test sampling is avoided, the accuracy and the instantaneity of the gas extraction drilling leakage point test are improved, the efficient extraction of coal seam gas is ensured, and obvious economic and social benefits can be generated.
Embodiment two:
fig. 2 is an overall schematic diagram of another structure of a coal seam drilling gas drainage leakage point detection system according to the present invention, as shown in the figure, in this embodiment, on the basis of the first embodiment, a flow detection unit is further connected to the second gas collecting pipe 5, for detecting the leakage point gas flow in the drainage drilling hole 1. In the specific implementation, as shown in the first embodiment, when the leak point is detected as the detection point 6, the first gas collecting pipeline 5 is closed, so that all the gas in the extraction drilling hole 1 flows to the second gas collecting pipeline 5 in a concentrated and concurrent manner. The flow of the leak is measured by a flow detection unit to determine if further leak maintenance is required.
Specifically, as shown in fig. 2, the flow detection unit includes a water drain 17, an air inlet and flow increasing port 18, a flow valve 19 and a flow meter 20, which are sequentially connected along the length direction of the second gas collecting pipeline 5. The water drain 17 is used for draining moisture in the gas collected in the second gas collecting pipeline 5 to reduce the measurement influence on the flowmeter. The air inlet flow increasing port is used for opening the air inlet flow increasing port at the moment when the single-hole flow is lower than the lower limit of the measuring range of the flowmeter, and the air inlet flow increasing port is opened at the moment, so that the outside air enters the pipeline under the action of negative pressure in the pipe, and the flow of the gas can be increased to enable the flowmeter to display the reading. Of course, the gas inlet flow increasing port only can influence the concentration of the gas in the pipe, and the purity of the gas in the pipe cannot be influenced. At this time, the gas passes through the drainer 17 and the inlet increasing port 18, then enters the flow valve 19 and the flow meter 20, the flow of the gas is detected by the flow meter, and the influence of the added negative pressure is subtracted by calculation, so that the flow data of the gas is obtained.
In addition, in the present embodiment, the protection valve 21 and the check valve 22 on the second gas collecting line 5; a protection valve 21 and a check valve 22 are connected to the rear end of the flow meter 20. The protection valve 21 is used to ensure that the air flow in the second collecting duct 5 is not too great. The check valve is used for limiting the gas in the second gas collecting pipeline 5 to flow in one direction only and preventing the gas from flowing in the opposite direction. Typically such valves operate automatically, with the valve flap opening under fluid pressure flowing in one direction, and the valve flap acting on the valve seat by the fluid pressure and its own weight when the fluid flows in the opposite direction, thereby shutting off flow.
Preferably, a concentration valve 16 is connected to the first gas collecting line 4.
Preferably, a probe plug is arranged at the end part of the extraction probe 10, which is positioned outside the extraction drilling hole 1, and is used for controlling the closure of the extraction pipeline.
Preferably, the extension pipe 14 is provided with a third gas measuring port 23 and a single-hole main valve 8 for controlling the flow of gas to the suction collection flow pipe 15.
As shown in fig. 3, the invention further provides a detection method based on the coal seam drilling gas extraction leakage point detection system, and the method is combined with a dichotomy to find the target leakage point in the extraction drilling hole, so that the target area can be quickly found under the condition that whether the target leakage point exists in the extraction drilling hole is unclear, the search time is saved, and the search efficiency is improved.
The specific implementation method comprises the following steps:
s100, arranging extraction drilling holes 1; the extraction main pipe 3, the extraction probe pipe 10, the first gas collecting pipeline 4 and the second gas collecting pipeline 5 are installed; plugging the orifice of the extraction drilling hole 1; inserting the extraction main pipe 3 into the extraction drilling hole 1;
s200, acquiring image information of the extraction drilling hole 1, marking N detection points 6 at equal intervals based on the hole length of the extraction drilling hole 1, and sequentially sequencing the N detection points 6 into 1, 2, 3 … …, N-1 and N number detection points 6, wherein N is more than or equal to 4;
s300, extending the extraction main pipe to an N detection point 6, taking the N detection point 6 as an initial detection point, extracting a detection gas sample in a sampling area of the initial detection point by using a top sieve hole 11 of the extraction probe pipe 10, collecting the detection gas sample to a first gas collecting pipeline 4, and detecting the gas concentration in the detection gas sample through a first gas detection port 12;
the sampling holes 9 uniformly arranged on the extraction main pipe 10 extract the comparative gas samples in the sampling areas of 1, 2, 3 … …, N-1 and N detection points 6, collect the comparative gas samples to the second gas collecting pipeline 5, and detect the gas concentration in the comparative gas samples through the second gas detecting port 13;
s400, sampling for multiple times, and carrying out fitting calculation and error judgment on the data to obtain a gas concentration average value C1 in a detected gas sample and a gas concentration average value C2 in a comparison gas sample;
s500, comparing the C1 with the C2, and judging whether the detection point N is a target leakage point;
if C1=C2, the extraction borehole has no target leakage point or N number detection point is the leakage point;
at this time, the concentration of the detected gas sample collected by the first gas collecting pipeline 4 is compared with a preset standard gas concentration threshold range, and if the detected gas sample concentration is lower than the standard gas concentration threshold range, the detection point 9 is the target leakage point. Otherwise, no target leakage point exists in the extraction drilling hole.
If C1 is larger than C2, the detection points 1, 2 and 3 … … N-1 are in the sampling area where the detection point 6 is located, and then the target leakage point is continued to be halved until the target leakage point is found.
Preferably, in step S500, if C1 > C2, the target leak point exists in the sampling area where the detection point No. 1, 2, 3 … … N-1 is located 6, and then the process continues until the target leak point is found, comprising the steps of:
s501, taking the middle points of 1, 2, 3 … … N-1 and N number detection points 6The number detection point is used as a secondary detection point, a top sieve hole 11 of the extraction probe 10 extracts a detection gas sample in a sampling area of the secondary detection point, and the detection gas sample is collected to the first gas collecting pipeline 4 and the gas concentration in the gas sample is detected through a first gas detection port 12;
s502, sampling for multiple times, fitting calculation and error judgment are carried out on the data, and a gas concentration average value C11 in the detected gas sample is obtained;
if c11=c2, if there is a target leak point in the sampling area above the secondary detection point in the extraction drilling hole 1, continuing to divide the sampling area above the corresponding serial number of the secondary detection point into two parts until the target leak point is found;
if C1 is larger than C2, the sampling area below the secondary detection point in the extraction drilling hole 1 is provided with the target leakage point, and the two parts are continued to be carried out on the area below the corresponding serial number of the secondary detection point until the target leakage point is found.
As an example of embodiment one, if the leak is in the sampling area corresponding to the detection point No. 6, the steps of the detection method are as follows:
the first step is the same as the step of step-by-step detection, the No. 9 detection point is taken as an initial detection point, the gas sucked by the top sieve holes 11 of the extraction probe rod 10 comes from the sampling area of the No. 9 detection point, namely, the gas collected in the first gas collecting pipeline 4 only comes from the sampling area of the No. 9 detection point, and the gas collected in the second gas collecting pipeline 5 comes from the collection of the gas in all the sampling areas from the No. 9 detection point to the No. 1 detection point.
At this time, the average value of the gas concentration of the detected gas obtained in the first gas collecting pipeline 4 is c1, which is necessarily greater than the average value of the gas concentration obtained in the second gas collecting pipeline 5, and c2 is obtained through sampling for multiple times, fitting calculation and error judgment on the data.
And secondly, stretching the top sieve holes 11 of the extraction probe rod 10 to the middle point of the detection points 1-9, namely the detection point 5, wherein the gas sucked by the top sieve holes 11 of the extraction probe rod 10 comes from the sampling areas of the detection points 9, 8 and … …, namely the gas collected in the first gas collecting pipeline 4 is collected only from the sampling areas from the detection points 9 to the detection points 5, and the gas collected in the second gas collecting pipeline 5 comes from the collection of the gas in all the sampling areas from the detection points 9 to the detection points 1.
And sampling for multiple times, and performing fitting calculation on the data, wherein the average value of the gas concentration of the detected gas obtained in the first gas collecting pipeline 4 is c1, which is necessarily equal to the average value of the gas concentration obtained in the second gas collecting pipeline 5, is c2.
And thirdly, extending the extraction probe rod to the middle point, namely a No. 5 detection point to a middle detection point corresponding to a No. 9 detection point, namely a No. 7 detection point, for extraction detection. At this time, the gas sucked by the top sieve holes 11 of the extraction probe 10 comes from the sampling areas of the detection points 9, 8 and 7, namely, the gas collected in the first gas collecting pipeline 4 only comes from the sampling areas from the detection point 9 to the detection point 7, and the gas collected in the second gas collecting pipeline 5 comes from the collection of the gas in all the sampling areas from the detection point 9 to the detection point 1.
The average value of the gas concentration of the detected gas obtained in the first gas collecting pipeline 4 is c1, which is necessarily greater than the average value of the gas concentration obtained in the second gas collecting pipeline 5, and c2 is obtained through sampling for multiple times, fitting calculation and error judgment on the data.
At this time, it can be determined that the leak point is necessarily in the sampling area corresponding to the detection point No. 6.
In summary, the embodiment adopts a corresponding step-by-step detection manner, and 4 steps are required to be completed to find the target leak point. However, when the dichotomy is adopted for detection, the target leakage point can be determined in only 3 steps.
The above is only one example, and it is obvious that the longer the length of the extraction drill hole is, the more detection points are, the higher the efficiency of the method is. Therefore, the detection method is combined with a dichotomy to find the target leakage point in the extraction drilling hole, so that the target area can be quickly found, the searching time is saved, and the searching efficiency is improved.
In addition, the method in combination with the second embodiment further includes the following steps:
and S600, after the target leakage point is found, closing the first gas collecting pipeline 4, and allowing the gas in the extraction drilling hole 1 to flow out through the second gas collecting pipeline 5, wherein the gas is used for detecting the gas flow of the leakage point through the flow detection unit. To determine if the leak requires subsequent maintenance.
The above examples are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solution of the present invention should fall within the scope of protection defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (10)
1. The coal seam drilling gas extraction leakage point detection system comprises an extraction drilling hole (1) drilled on a coal seam, and is characterized in that,
a hole sealing device (2) is arranged at the orifice of the extraction drilling hole (1);
the first end of the extraction main pipe (3) passes through the hole sealing device (2) and extends into the extraction drilling hole (1), and the pipe orifice of the end is in a blocking state;
the second end of the extraction main pipe (3) is arranged outside the extraction drilling hole (1), and the second end is respectively connected with the first gas collecting pipeline (4) and the second gas collecting pipeline (5);
the first gas collecting pipeline (4) is connected to a first branch of the extraction main pipe (3);
the second gas collecting pipeline (5) is connected to a second branch of the extraction main pipe (3);
the second branch is positioned at the front end of the first branch;
n detection points (6) are arranged in the extraction drilling hole (1) at equal intervals in the length direction of the drilling hole, wherein N is more than or equal to 4;
the part of the extraction main pipe (3) positioned in the extraction drilling hole (1) is divided into a plurality of sampling areas (7) according to the N detection points (6);
the surface of the extraction drilling hole (1) positioned in the sampling area (7) is uniformly provided with a plurality of sampling holes (9), and the plurality of sampling holes (9) are used for collecting gas in the corresponding sampling area (7) and are conveyed into the second gas collecting pipeline (5) through the extraction main pipe (3);
a extraction probe tube (10) is arranged in the extraction main tube (3) in a penetrating way;
one end of the extraction probe tube (10) positioned in the extraction drilling hole (1) extends to a tube orifice at the first end of the extraction main tube (3) and penetrates out of the end;
one end of the extraction probe tube (10) positioned outside the extraction drilling hole (1) extends to the first branch;
the extraction probe tube (10) is positioned at a tube orifice in the extraction drilling hole (1) and provided with a top sieve pore (11) for collecting gas near a corresponding detection point (6) and conveying the gas to the first gas collecting pipeline (4) through the extraction probe tube (10);
the first gas collecting pipeline (4) is connected with a first gas measuring port (12);
the second gas collecting pipeline (5) is connected with a second gas measuring port (13);
the first gas measuring port (12) and the second gas measuring port (13) are used for comparing gas sample acquired by each pipeline and monitoring and displaying the gas concentration through the concentration detector;
the tail ends of the first gas collecting pipeline (4) and the second gas collecting pipeline (5) are converged to an extension pipe (14);
the front end of the extension pipe (14) is communicated with the pumping collection flow pipe (15).
2. The coal seam drilling gas extraction leakage point detection system according to claim 1, wherein the second gas collecting pipeline (5) is connected with a flow detection unit for detecting leakage point gas flow in the extraction drilling hole (1).
3. The coal seam drilling gas extraction leakage point detection system according to claim 2, wherein the flow detection unit comprises a water drain (17), an air inlet flow increasing port (18), a flow valve (19) and a flow meter (20) which are sequentially connected along the length direction of the second gas collecting pipeline (5).
4. A coal seam drilling gas extraction leak detection system as claimed in claim 3, wherein the flow detection unit further comprises a protection valve (21) and a non-return valve (22) connected in sequence to the second gas collection line (5); the protection valve (21) and the check valve (22) are connected to the rear end of the flowmeter (20).
5. The coal seam drilling gas extraction leak detection system of claim 4, wherein the first gas collection pipeline (4) is connected with a concentration valve (16).
6. The coal seam drilling gas extraction leakage point detection system according to claim 5, wherein an end part of the extraction probe tube (10) located outside the extraction drilling hole (1) is provided with a probe tube plug.
7. The coal seam drilling gas extraction leak detection system of claim 6, wherein a third gas port (23) and a single-hole main valve (8) are arranged on the extension pipe (14).
8. A method for detecting coal seam drilling gas extraction leakage points, which uses the coal seam drilling gas extraction leakage point detection system as claimed in any one of claims 1 to 7, and is characterized by comprising the following steps:
s100, arranging extraction drilling holes (1); a main extraction pipe (3), an extraction probe pipe (10), a first gas collecting pipeline (4) and a second gas collecting pipeline (5) are installed; plugging the orifice of the extraction drilling hole (1); inserting the extraction main pipe (3) into the extraction drilling hole (1);
s200, acquiring image information of the extraction drilling hole (1), marking N detection points (6) at equal intervals based on the hole length of the extraction drilling hole (1), and sequentially sequencing the N detection points (6) into 1, 2, 3 … …, N-1 and N number detection points (6), wherein N is more than or equal to 4;
s300, extending a main extraction pipe to an N detection point (6), taking the N detection point (6) as an initial detection point, extracting a detection gas sample in a sampling area of the initial detection point by a top sieve opening (11) of an extraction probe pipe (10), collecting the detection gas sample to a first gas collecting pipeline (4), and detecting the concentration of gas in the detection gas sample through a first gas detection port (12);
the sampling holes (9) uniformly arranged on the extraction main pipe (10) are used for extracting comparative gas samples in sampling areas of 1, 2, 3 … …, N-1 and N detection points (6), and collecting the comparative gas samples to the second gas collecting pipeline (5), and detecting the gas concentration in the comparative gas samples through the second gas measuring port (13);
s400, sampling for multiple times, and carrying out fitting calculation on the data to obtain a gas concentration average value C1 in the detected gas sample and a gas concentration average value C2 in the comparison gas sample;
s500, comparing the C1 with the C2, and judging whether the detection point N is a target leakage point;
if C1=C2, the extraction borehole has no target leakage point or N number detection point is the leakage point;
at this time, the concentration of the detected gas sample collected by the first gas collecting pipeline (4) is compared with a preset standard gas concentration threshold range, and if the concentration is lower than the standard gas concentration threshold range, the N-th detection point is the target leakage point. Otherwise, no target leakage point exists in the extraction drilling hole;
if C1 is more than C2, the detection points 1, 2 and 3 … … N-1 are in the sampling area where the detection point (6) is located, and then the target leakage point is continued to be halved until the target leakage point is found.
9. The method for detecting leakage points of coal seam drilling gas extraction according to claim 8, wherein in the step S500, if C1 > C2, the detection points 1, 2, 3 … … N-1 (6) are located in the sampling area, and the target leakage points are located, the method continues to be divided into two parts until the target leakage points are found, comprising the following steps:
s501, taking the intermediate points of 1, 2, 3 … … N-1 and N detection points (6)The number detection point is used as a secondary detection point, and a top sieve pore (11) of the extraction probe tube (10) extracts a detection gas sample in a sampling area of the secondary detection pointThe gas concentration is collected to a first gas collecting pipeline (4) and detected in the gas sample through a first gas measuring port (12);
s502, sampling for multiple times, and carrying out fitting calculation on the data to obtain a gas concentration average value C11 in the detected gas sample;
if C11=C2, the sampling area above the secondary detection point in the extraction drilling hole (1) is provided with a target leakage point, and then the sampling area above the corresponding serial number of the secondary detection point is continued to be divided into two parts until the target leakage point is found;
if C1 is more than C2, the sampling area below the secondary detection point in the extraction drilling hole (1) contains the target leakage point, and the two parts are continued to be carried out on the area below the corresponding serial number of the secondary detection point until the target leakage point is found.
10. The method for detecting coal seam drilling gas extraction leakage points according to claim 8, further comprising the steps of:
and S600, after the target leakage point is found, closing the first gas collecting pipeline (4), and allowing all the gas in the extraction drilling hole (1) to flow out through the second gas collecting pipeline (5), wherein the gas is used for detecting the gas flow of the leakage point through the flow detection unit.
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