Device for determining hole sealing depth of coal seam gas extraction drill hole

Abstract

The utility model discloses a device for determining the hole sealing depth of a coal seam gas extraction drill hole, and belongs to the field of coal mine underground gas extraction. The device comprises a tracing gas cylinder, a bundling pipe, an automatic valve, a flow sensor, a pressure sensor, an extraction pipe and an SF6 detector. The tracer gas cylinder is connected with a bundling pipe, the bundling pipe is communicated into the tracer gas chamber, a pressure sensor is arranged in the tracer gas chamber, a flow sensor and an automatic valve are arranged in the bundling pipe, the bundling pipe is communicated into the tracer gas chamber, and the extraction pipe is connected with an SF6 detector. The device solves the problems that in the prior art, the tracer gas detection precision is insufficient, the leakproofness of a hole sealing area cannot be judged, the hole sealing depth quality evaluation time is long, and the precision is low. Through intelligent and automatic improvement, accurate and rapid detection of the concentration and pressure of the tracer gas in the tracer gas chamber is realized.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of coal mine underground gas extraction, and particularly relates to a device for determining the sealing depth of a coal seam gas extraction borehole. BACKGROUND

[0002] During coal mining, the coal seam gas extraction system is crucial, and the sealing depth is one of the key factors determining the gas extraction effect. The gradually increasing gas pressure in the coal seam puts forward higher requirements for the depth and quality of sealing.

[0003] Currently, the application of tracer gas in the field of gas extraction is gradually becoming increasingly widespread and important. This technology is mainly applied to the sealing device and sealing quality inspection link in the gas extraction process, providing strong technical support for coal mine safety production. However, some problems that need to be solved have been found in actual application.

[0004] Specifically, the current tracer gas chamber arrangement is relatively simple, lacking sufficient refinement and standardization. At the same time, the gas injection device is also relatively simple, without fully considering the complexity of gas diffusion and pressure distribution. Such simple equipment and arrangement can easily lead to uneven pressure distribution of tracer gas in the gas chamber, and unstable gas diffusion direction and speed. This not only affects the detection accuracy of tracer gas, making the sealing quality and sealing depth inspection results have large errors, but also may bring potential safety hazards to coal mine production.

[0005] Therefore, it is necessary to conduct more in-depth research and improvement on the application of tracer gas in the field of gas extraction. UTILITY MODEL CONTENT

[0006] The core content of the utility model is to provide a device for determining the sealing depth of a coal seam gas extraction borehole, aiming to overcome the problems of insufficient detection accuracy of tracer gas in the tracer gas chamber, inability to judge whether the sealing area is tight, long quality judgment time of sealing depth, and low precision in the prior art. The device retains the effectiveness of the traditional method, and integrates intelligent and automated improvements to realize more accurate and efficient determination of the concentration and pressure of tracer gas in the tracer gas chamber, thereby efficiently and accurately evaluating the quality of the sealing depth of the coal seam gas extraction borehole. The ultimate goal is to improve the gas extraction efficiency and significantly reduce the judgment error of the sealing depth.

[0007] The utility model discloses a technical scheme provides a kind of device for determining coal seam gas extraction borehole sealing depth, including tracer gas bottle, cluster tube, one end of cluster tube and tracer gas bottle connection;The port of the other end of cluster tube extends to tracer gas chamber, and automatic valve and flow sensor are provided at the port, for control and detection gas flow that tracer gas bottle is flowed into tracer gas chamber;Pressure sensor is provided in tracer gas chamber, for detecting the pressure of tracer gas in tracer gas chamber.

[0008] The device for determining coal seam gas extraction borehole sealing depth also includes an SF6 detector, and the extraction pipe is connected to the SF6 detector.

[0009] Further, the cluster tube and the tracer gas bottle are connected through the cluster tube valve, and a pressure gauge is provided on the cluster tube.

[0010] Further, the pressure sensor, the flow sensor and the automatic valve are all connected to a terminal platform, which is used to monitor and adjust the flow and pressure of the tracer gas chamber.

[0011] Further, the flow sensor also synchronously detects whether the automatic valve is normally closed.

[0012] Further, the pressure sensor also synchronously detects the tightness of the sealing area.

[0013] The tracer gas bottle contains tracer gas, and the tracer gas is preferably SF6 tracer gas.

[0014] Further, an SF6 detector is provided between the extraction pipe and the roadway extraction branch pipe, which is used to detect the SF6 content in the extracted gas.

[0015] The device for determining coal seam gas extraction borehole sealing depth has the following advantages compared with the prior art:

[0016] 1. Intelligent and automated improvement: By integrating the automatic valve, the flow sensor and the pressure sensor, intelligent and automated control of the tracer gas injection and detection process is realized, improving the detection efficiency and accuracy.

[0017] 2. Reduce error: through real-time monitoring data by pressure sensor and flow sensor, analyze whether the quality of the enclosed area is insufficient or the length or quality of the hole sealing section, which can further reduce the error and get reasonable and reliable results. More specifically, the pressure sensor can transmit data back to the terminal platform in real time, which is convenient for timely evaluation of hole sealing quality. The pressure sensor can control the automatic valve in real time, stop or start the input of tracer gas at any time, which can efficiently complete the quality length check of the hole sealing section. The flow sensor can further check the flow rate of the gas to realize the precise control of the gas chamber gas concentration, achieve efficient and accurate evaluation of the quality of the hole sealing depth, thereby improving the gas extraction efficiency and greatly reducing the judgment error of the hole sealing depth.

[0018] 3. The device for determining the hole sealing depth of the coal seam gas extraction drilling hole of the utility model can further improve the accuracy and reliability of the tracer gas detection by optimizing the arrangement mode of the tracer gas chamber, improving the design of the gas injection device, and introducing more advanced detection technology and equipment, thereby providing more powerful protection for the safety production of coal mines. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is the schematic diagram of the drilling hole plane arrangement of the utility model;

[0020] Figure 2 is the schematic diagram of the hole sealing plane arrangement of the utility model;

[0021] Figure 3 is the internal arrangement structure diagram of the tracer gas chamber of the utility model;

[0022] In the drawings, the reference signs are as follows: 1 is a transportation crossheading, 2 is a transportation crossheading working face, 3 is an air return crossheading, 4 is a goaf, 5 is a first drilling hole, 6 is a second drilling hole, 7 is a third drilling hole, 8 is a fourth drilling hole, 9 is a fifth drilling hole, 10 is a sixth drilling hole, 11 is a hole sealing section, 12 is a tracer gas chamber, 13 is a hole sealing area, 14 is an extraction pipe, 15 is a pressure gauge, 16 is a cluster tube valve, 17 is a cluster tube, 18 is a tracer gas cylinder, 19 is a test valve, 20 is an SF6 detector, 21 is a roadway extraction branch pipe, 22 is an automatic valve, 23 is a pressure sensor, and 24 is a flow sensor. DETAILED DESCRIPTION

[0023] The implementation of the utility model is further described below in combination with the drawings:

[0024] Referring to Figures 1-3 , the utility model provides a kind of plane arrangement schematic diagram of the device for determining the hole sealing depth of the coal seam gas extraction drilling hole.

[0025] With Figure 1The schematic diagram of the drilling plane arrangement of the example mining working face illustrates the arrangement mode and use method of the device for determining the sealing depth of the gas extraction drilling hole in the coal seam.

[0026] On one side of the transport gate road working face 2 of the goaf 4, a transport gate road 1 is arranged below, and an air return gate road 3 is arranged above, and in the space formed by the transport gate road 1 and the air return gate road 3, the coal seam drilling holes are constructed on the mining side of the transport gate road 1, and the gas extraction drilling holes with different sealing section depths are constructed at an average interval, to obtain the first drilling hole 5, the second drilling hole 6, the third drilling hole 7, the fourth drilling hole 8, the fifth drilling hole 9, the sixth drilling hole 10, and the six drilling holes with different sealing section depths 11. The sealing section 11 is retained in the drilling hole, and the sealing area 13 is arranged, and the tracer gas chamber 12 is formed between the sealing section 11 and the sealing area 13. The extraction pipe 14 is buried in each drilling hole.

[0027] The device for determining the sealing depth of the gas extraction drilling hole in the coal seam is arranged in the tracer gas chamber 12, and the device for determining the sealing depth of the gas extraction drilling hole in the coal seam comprises a tracer gas bottle 18 and a cluster pipe 17, one end of the cluster pipe 17 is connected with the tracer gas bottle 18, the cluster pipe 17 is provided with a cluster pipe valve 16 and a pressure gauge 15; the other end of the cluster pipe 17 is provided with an automatic valve 22 and a flow sensor 24, and the port of the other end of the cluster pipe 17 extends into the tracer gas chamber 12, and the port is provided with the automatic valve 22 and the flow sensor 24, which are used for controlling and detecting the gas flow rate of the tracer gas bottle 18 into the tracer gas chamber 12; the pressure sensor 23 is arranged in the tracer gas chamber 12, and the pressure value of the tracer gas SF6 in the tracer gas chamber 12 is monitored in real time.

[0028] The pressure sensor 23, the flow sensor 24 and the automatic valve 22 are connected with a terminal platform, the terminal platform is used for monitoring and adjusting the flow and pressure of the tracer gas chamber 12, the pressure sensor 23 and the flow sensor 24 transmit the detected data to the terminal platform in real time, the opening size and opening and closing of the automatic valve 22 are adjusted and controlled through the terminal platform, the flow rate of the tracer gas into the tracer gas chamber is adjusted, and then the concentration and pressure of the tracer gas in the tracer gas chamber are ensured.

[0029] The pressure sensor 23 can detect the sealing degree of the sealing area 13 and control the pressure of the tracer gas in the tracer gas chamber 12.

[0030] The flow sensor 24 can detect the flow rate and flow of the gas filled into the tracer gas chamber 12 from the tracer gas bottle 18, and the concentration is convenient to control.

[0031] The device for determining the sealing depth of the gas extraction borehole in the coal seam further comprises an SF6 detector 20, and the extraction pipe 14 is connected with the SF6 detector 20, more specifically, the SF6 detector 20 is arranged between the extraction pipe 14 and a roadway extraction branch pipe 21, and is used for detecting the SF6 gas content in the extraction gas, a detection valve 19 is arranged on the pipe connected with the extraction pipe 14 and the SF6 detector 20, and a high negative pressure sampler is arranged at one end of the pipe connected with the extraction pipe.

[0032] The tracer gas bottle 18 contains SF6 tracer gas.

[0033] The device for determining the sealing depth of the gas extraction borehole in the coal seam has the following specific operation steps:

[0034] (1) A drilling hole is constructed every interval on the working face 2 of the coal mine mining area transport crossheading, and a first drilling hole 5, a second drilling hole 6, a third drilling hole 7, a fourth drilling hole 8, a fifth drilling hole 9 and a sixth drilling hole 10 are constructed.

[0035] (2) After the extraction pipe 14 is buried in each drilling hole, sealing and extraction are performed, a part of the gas chamber space (1.5 meters are recommended) at the front end of the drilling hole is not sealed first, and the position of the gas chamber is sealed later. The drilling depth is the same, and the depth of the sealing section of the first drilling hole 5 is 7 meters, the depth of the sealing section of the second drilling hole 6 is 8 meters, the depth of the sealing section of the third drilling hole 7 is 9 meters, the depth of the sealing section of the fourth drilling hole 8 is 10 meters, the depth of the sealing section of the fifth drilling hole 9 is 11 meters, and the depth of the sealing section of the sixth drilling hole 10 is 12 meters. The extraction pipe 14 is connected with the SF6 detector 20.

[0036] (3) The gas chamber space (1.5 meters are recommended) is made into a tracer gas chamber 12 (1 meter is recommended) and a sealing area 13 (0.5 meter is recommended).

[0037] (4) The pressure sensor 23 is arranged in the tracer gas chamber 12, and the flow sensor 24 is arranged in the cluster pipe 17, and the cluster pipe 17 is provided with an automatic valve 22.

[0038] (5) One end of the cluster pipe 17 provided with the flow sensor 24 and the automatic valve 22 is connected to the tracer gas chamber 12 after the sealing area 13, and the other end is connected to the tracer gas bottle 18. The automatic valve 22 and the flow sensor 24 are arranged in the tracer gas chamber 12 on the cluster pipe 17.

[0039] (6) The pressure sensor 23, the automatic valve 22 and the flow sensor 24 are opened.

[0040] (7) Inject tracer gas SF6 into tracer gas chamber 12, first open the cluster tube valve 16 connected with cluster tube 17, then open the switch of tracer gas cylinder 18, and observe pressure gauge 15, pressure sensor 23 and flow sensor 24, when the required pressure value is stable, operate automatic valve 22 to automatically close, to obtain SF6 gas with required pressure or concentration. Different pressure values can be set according to different gas chamber sizes and hole sealing lengths, to accelerate gas diffusion and efficiently and accurately seal the hole.

[0041] (8) The pressure sensor 23 can be observed to see its pressure change, if the change is too large in a short time, it means that the hole sealing of the control area 13 is not tight, which will cause the tracer gas to leak in the control area 13, affecting the experimental results. If the pressure change is not drastic, it means that the control area 13 is relatively tight, and the next step of research can be carried out.

[0042] (9) After waiting for a period of time for stable extraction, open the test valve 19, and use the high negative pressure sampler to extract gas through the extraction pipe 14.

[0043] (10) Measure the SF6 in the extracted gas at the first borehole 5 hole sealing depth, measure the SF6 in the extracted gas at the second borehole 6 hole sealing depth, measure the SF6 in the extracted gas at the third borehole 7 hole sealing depth, measure the SF6 in the extracted gas at the fourth borehole 8 hole sealing depth, measure the SF6 in the extracted gas at the fifth borehole 9 hole sealing depth, and measure the SF6 in the extracted gas at the sixth borehole 10 hole sealing depth.

[0044] (11) By observing whether the extracted gas contains tracer gas SF6, the depth and quality effectiveness of the hole sealing can be known, that is, the shortest hole sealing depth of the borehole without tracer gas SF6 in the extracted gas is the best hole sealing depth for the coal seam gas extraction borehole.

Claims

1. A device for determining the sealing depth of a gas drainage borehole in a coal seam, characterized in that: The device for determining the sealing depth of the coal seam gas drainage borehole includes a tracer gas cylinder, a bundled tube, an automatic valve, a flow sensor, a pressure sensor, and an SF6 detector. One end of the bundled tube is connected to the tracer gas cylinder; the other end of the bundled tube extends into the tracer gas chamber, and an automatic valve and a flow sensor are installed at the port to control and detect the gas flow rate from the tracer gas cylinder into the tracer gas chamber; a pressure sensor is installed inside the tracer gas chamber to detect the pressure of the tracer gas inside the chamber; and the SF6 detector is connected to the extraction tube.

2. The device for determining the sealing depth of a coal seam gas drainage borehole according to claim 1, characterized in that: The bundle tube and the tracer gas cylinder are connected by a bundle tube valve, and a pressure gauge is installed in the bundle tube.

3. The device for determining the sealing depth of a coal seam gas drainage borehole according to claim 1, characterized in that: The pressure sensor, flow sensor, and automatic valve are all connected to the terminal platform. The terminal platform is used to monitor and adjust the flow and pressure of the tracer gas chamber. The pressure sensor and flow sensor transmit the detected data back to the terminal platform in real time. The terminal platform controls the opening size and opening and closing of the automatic valve to adjust the flow of tracer gas into the tracer gas chamber, thereby ensuring the concentration and pressure of the tracer gas in the tracer gas chamber.

4. The device for determining the sealing depth of a coal seam gas drainage borehole according to claim 1, characterized in that: The flow sensor also simultaneously detects whether the automatic valve is closed properly.

5. The device for determining the sealing depth of a coal seam gas drainage borehole according to claim 1, characterized in that: The pressure sensor also simultaneously detects the tightness of the sealing area.

6. The device for determining the sealing depth of a coal seam gas drainage borehole according to claim 1, characterized in that: The tracer gas cylinder contains tracer gas SF6.

7. The device for determining the sealing depth of a coal seam gas drainage borehole according to claim 1, characterized in that: A detection valve is installed on the pipeline connecting the extraction pipe and the SF6 detector.

8. The device for determining the sealing depth of a coal seam gas drainage borehole according to claim 1, characterized in that: The extraction pipe is connected to the roadway extraction branch pipe.

9. The device for determining the sealing depth of a coal seam gas drainage borehole according to claim 1, characterized in that: A high negative pressure sampler is installed at one end of the pipeline connecting the SF6 detector to the sampling pipe.

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