A downhole collared tubing inspection device

Abstract

The utility model discloses a kind of underground beam tube pipeline detection devices, it is related to underground sampling technical field, it is arranged between main beam and system sampling cabinet, main beam includes multiple sampling tubes extended to different key areas in underground;Multiple sampling ports are provided on system sampling cabinet corresponding to multiple sampling tubes;Underground beam tube pipeline detection device includes the communication pipeline connected between sampling port and its corresponding sampling tube;One negative pressure vacuum gauge is respectively provided on each communication pipeline. Negative pressure vacuum gauge can monitor the pressure condition in sampling tube in real time, accurately, by real-time monitoring pressure change, the conduction condition of beam tube pipeline can be accurately judged according to pressure value.

Description

Technical Field

[0001] This utility model relates to the field of downhole sampling technology, and in particular to a downhole bundled pipe testing device. Background Technology

[0002] In mine production, underground tube systems are typically installed to monitor the gas composition and concentration in different key areas in real time. These systems use multiple sampling tubes to transport gas samples from various underground areas to a surface sampling cabinet for analysis. However, due to the complex underground environment, tube systems are prone to breakage, blockage, and other malfunctions, leading to inaccurate or unreliable gas sample collection, severely impacting mine safety monitoring and fire prevention / extinguishing decisions. Utility Model Content

[0003] The purpose of this invention is to provide an underground bundled pipe detection device that can monitor the pressure of underground bundled pipes, accurately determine the continuity of the pipes, and promptly detect pipe faults, thus providing effective technical support for mine fire prevention and extinguishing decisions.

[0004] To achieve the above objectives, this utility model provides a downhole bundled tubing inspection device, which is installed between the main main bundle and the system sampling cabinet. The main main bundle includes multiple sampling tubes extending to different key areas downhole. The system sampling cabinet is provided with multiple sampling ports corresponding to the multiple sampling tubes. The downhole bundled tubing inspection device includes a connecting pipe connecting the sampling port and its corresponding sampling tube. A negative pressure vacuum gauge is installed on each connecting pipe.

[0005] With the above structure, the negative pressure vacuum gauge can monitor the pressure inside the sampling tube in real time and accurately. By monitoring pressure changes in real time, the continuity of the bundled tube can be accurately determined based on the pressure values. When the measured value is less than -0.02 MPa, it can be determined in time that the tube may be broken or disconnected; when the measured value is greater than -0.06 MPa, it can be determined that the tube may be blocked. This accurate monitoring and judgment helps to detect bundled tube faults in a timely manner, avoid safety accidents caused by failure to detect faults in time, provide strong protection for safe production in the mine, ensure the accuracy and reliability of underground bundled tube monitoring data, and provide a reliable basis for mine fire prevention and extinguishing decisions.

[0006] Preferably, a filter for filtering moisture and impurities is also installed on the connecting pipeline between the negative pressure vacuum gauge and the sampling tube. The filter effectively removes moisture and impurities from the pre-analytical pipeline. In the complex downhole environment, moisture and impurities in the gas can severely damage the analytical instrument, shorten its lifespan, and affect pipeline flow, reducing system stability and reliability. The filter provides excellent protection for the analytical instrument, extends its lifespan, ensures unobstructed surface pipelines, improves system stability and reliability, reduces system failures caused by impurities and moisture, and lowers system maintenance costs.

[0007] Preferably, the system also includes a high-pressure pipe, a pressure-reducing valve mounted on the high-pressure pipe, and a positive pressure gauge; a switch valve is installed at the end of the sampling pipe; the inlet of the high-pressure pipe is connected to a high-pressure gas supply device, and its outlet is connected in parallel with the connecting pipeline to the sampling pipe; a three-way valve is installed at the connection point of the three components; the sampling pipe and the connecting pipeline, or the sampling pipe and the high-pressure pipe, are switched and connected via the three-way valve. By setting up a positive pressure detection system consisting of a high-pressure pipe, a pressure-reducing valve, a positive pressure gauge, and a three-way valve, the sampling pipe can be periodically tested for positive pressure. During the testing process, by precisely controlling the gas pressure and observing the changes in the positive pressure gauge readings, the continuity of the pipeline can be detected more intuitively and accurately, offering higher sensitivity and accuracy compared to traditional testing methods. Positive pressure can disperse blockages, achieving a certain degree of pipeline unblocking effect. For minor blockages in pipelines, positive pressure can clear them and restore normal ventilation. For severe blockages, positive pressure detection can also detect them in time, providing clear guidance for subsequent maintenance work, reducing the impact of pipeline blockages on gas collection, and ensuring the normal operation of the downhole bundle system.

[0008] Preferably, multiple sets of main pipe bundles are provided; multiple high-pressure main branch pipes are connected in parallel to each high-pressure pipe; the number of high-pressure main branch pipes corresponds to the number of main pipe bundles; multiple high-pressure branch pipes are connected in parallel to each high-pressure main branch pipe, and each high-pressure branch pipe is connected to a corresponding three-way valve. For cases with multiple sets of main pipe bundles, by setting up high-pressure main branch pipes and high-pressure branch pipes and connecting them to corresponding three-way valves, positive pressure detection of different sampling pipes can be achieved. This design has high flexibility and scalability, and can meet the needs of mines of different sizes and layouts. In large-scale underground pipe bundle systems, multiple sets of main pipe bundles can be detected simultaneously, greatly improving detection efficiency, reducing detection time, facilitating system upgrades and maintenance, and reducing detection costs.

[0009] Preferably, a filter is provided at the air inlet end of the high-pressure pipe.

[0010] Preferably, the three-way valve is a solenoid valve, which is connected to the controller signal, enabling remote control of its opening and closing.

[0011] Preferably, each sampling tube consists of multiple sampling sub-tubes of fixed length connected together, with a switch valve installed between adjacent sampling sub-tubes. By configuring the sampling tube as a series of connected sampling sub-tubes and installing a switch valve between adjacent sampling sub-tubes, the leak point can be quickly located by sequentially opening the switch valves and detecting the pressure.

[0012] After adopting the above technical solution, the beneficial effects of this utility model are:

[0013] This utility model provides a downhole bundled tube testing device that solves the technical problem in the prior art where the continuity of the downhole bundled tube during the sampling process cannot be accurately determined. This utility model can monitor the pressure in the sampling tube in real time and accurately through a negative pressure vacuum gauge. By monitoring the pressure changes in real time, the continuity of the bundled tube can be accurately determined based on the pressure value. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a downhole tubing testing device according to the present invention.

[0015] In the diagram, 1 is the sampling tube, 2 is the connecting pipe, 21 is the negative pressure vacuum gauge, 3 is the filter, 4 is the high pressure pipe, 40 is the high pressure main branch pipe, 401 is the high pressure branch pipe, 41 is the pressure reducing valve, 42 is the positive pressure gauge, and 5 is the three-way valve. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings.

[0017] The orientations mentioned in this specification are based on the orientation of the downhole bundled pipe testing device of this utility model when it is working normally. They do not limit the orientation during storage and transportation, and only represent relative positional relationships, not absolute positional relationships.

[0018] like Figure 1 As shown, a downhole bundle testing device is installed between the main bundle and the system sampling cabinet to monitor the integrity of the downhole bundle.

[0019] The main bundle includes multiple sampling tubes 1 extending to different key areas downhole; the system sampling cabinet is equipped with multiple sampling ports corresponding to the multiple sampling tubes 1. The downhole bundle pipeline detection device includes a connecting pipeline 2 connecting the sampling port and its corresponding sampling tube 1; each connecting pipeline 2 is equipped with a negative pressure vacuum gauge 21.

[0020] When the system sampling cabinet performs negative pressure sampling on sampling tube 1, the pressure of sampling tube 1 can be monitored in real time by connecting a negative pressure vacuum gauge 21 to the connecting pipe 2. Based on the measurement value of the vacuum gauge, the continuity status of the bundled tube pipeline can be accurately determined. In this embodiment, when the measurement value of the negative pressure vacuum gauge 21 is less than -0.02 MPa, it can be determined that the pipeline may be broken or disconnected; when the measurement value is greater than -0.06 MPa, it can be determined that the pipeline may be blocked. This helps to detect bundled tube faults in a timely manner, ensures the authenticity and reliability of underground bundled tube monitoring data, and provides effective technical support for mine fire prevention and extinguishing decisions.

[0021] A filter 3, a positive and negative pressure vacuum filter, is installed on the connecting pipe 2 between the negative pressure vacuum gauge 21 and the sampling tube 1 to filter moisture and impurities. By installing filter 3, moisture and impurities in the pre-analytical pipeline can be effectively filtered, preventing them from entering the ground-based post-analytical pipeline and the instrument. This not only provides excellent protection for the instrument and extends its service life, but also ensures the unobstructed flow of the ground pipeline, improving the stability and reliability of the system.

[0022] A downhole tubing inspection device further includes a high-pressure pipe 4, a pressure reducing valve 41 installed on the high-pressure pipe 4, and a positive pressure gauge 42; a switch valve is installed at the end of the sampling pipe 1. The air inlet of the high-pressure pipe 4 is connected to a high-pressure air supply device, and its air outlet is connected in parallel with the connecting pipe 2 to the sampling pipe 1. A three-way valve 5 is installed at the connection point of the three; the three-way valve 5 can selectively connect the sampling pipe 1 and the connecting pipe 2 or connect the sampling pipe 1 and the high-pressure pipe 4; that is, when ab is open, ac is closed; when ac is open, ab is closed, and bc is closed. In order to achieve automated control, the three-way valve 5 is a solenoid valve, which is connected to the controller signal, and its opening and closing status can be remotely controlled by a person.

[0023] During positive pressure testing, the switch valve at the end of sampling tube 1 is closed, and the three-way valve 5 connects sampling tube 1 and high-pressure tube 4, creating a relatively sealed state. The high-pressure gas supply device provides stable high-pressure air, and the pressure of the high-pressure gas is precisely controlled by the pressure reducing valve 41 to ensure that the gas pressure entering sampling tube 1 is within a suitable range, meeting the testing requirements without damaging sampling tube 1 or other equipment due to excessive pressure. In this embodiment, the output pressure of the pressure reducing valve is controlled within the range of 0.3-0.4 MPa (the downhole tubing withstand pressure is less than 0.6 MPa). This pressure range ensures accurate detection of pipeline continuity while guaranteeing safe equipment operation. The continuity status is determined by observing the changes in the positive pressure gauge 42.

[0024] When the pipeline is unobstructed, the pressure in sampling tube 1 at the closed end may rise to the predetermined pressure value within seconds, with unimpeded pressure rise, and the pressure value remains unchanged after standing. If sampling tube 1 is broken, the expected pressure value cannot be reached; if sampling tube 1 partially leaks, the pressure rise will be significantly hindered, and it may eventually reach the predetermined pressure value, but the pressure value will gradually decrease after standing. If sampling tube 1 is severely blocked, the negative pressure vacuum gauge 21 can detect it during the sampling process; if it is slightly blocked, there will be some resistance to the pressure rise, and the gas can barely accumulate to a certain pressure in the pipeline, but due to the unstable flow of gas at the blocked part, local eddies and pressure fluctuations will be generated. These fluctuations will be transmitted to the positive pressure gauge 42, causing the pointer of the positive pressure gauge 42 to fluctuate significantly, and the pressure value will fluctuate within a certain range, instead of remaining relatively stable as when the pipeline is unobstructed.

[0025] By setting up a positive pressure detection system consisting of a high-pressure pipe 4, a pressure reducing valve 41, a positive pressure gauge 42, and a three-way valve 5, the sampling pipe 1 can be tested in a positive pressure manner on a regular basis. This allows for a more intuitive and accurate detection of pipe patency issues. Furthermore, the positive pressure can disperse blockages and achieve a certain effect in unblocking the pipes.

[0026] The main pipe bundles are configured in multiple groups; in this embodiment, two groups are configured, and each high-pressure pipe 4 has multiple high-pressure main branch pipes 40 connected in parallel. The number of high-pressure main branch pipes 40 corresponds to the number of main pipe bundles, and in this embodiment, two are configured. Each high-pressure main branch pipe 40 has multiple high-pressure branch pipes 401 connected in parallel, and each high-pressure branch pipe 401 is connected to a corresponding three-way valve 5. In this embodiment, each main pipe bundle has ten sampling pipes 1, and each sampling pipe 1 is equipped with a corresponding three-way valve 5, so each high-pressure main branch pipe 40 has a high-pressure branch pipe 401 connected in parallel. By controlling the opening status of different three-way valves 5, positive pressure detection of different sampling pipes 1 can be achieved. For the case of multiple main pipe bundles, by setting high-pressure main branch pipes 40 and high-pressure branch pipes 401 and connecting them with corresponding three-way valves, positive pressure detection of different sampling pipes 1 can be achieved, meeting the detection requirements of large-scale downhole bundle systems.

[0027] Furthermore, a filter 3 is also installed at the air inlet of the high-pressure pipe 4 to further filter impurities in the air entering the high-pressure pipe, ensuring the quality of the gas entering the sampling pipe 1 and reducing the impact on the pipeline and testing equipment.

[0028] In practical applications, the sampling tube 1 is relatively long, and each sampling tube 1 consists of multiple sampling sub-tubes of fixed length connected together. Adjacent sampling sub-tubes are connected by connectors. To enable rapid location of leaks, a switch valve is installed between adjacent sampling sub-tubes. The switch valve is a solenoid valve. By sequentially opening the switch valve and detecting its pressure, the location of the leaking sampling tube 1 can be determined, enabling rapid location of the leak for accurate replacement and repair, thus improving maintenance efficiency.

[0029] The working process of the downhole tubing inspection device of this utility model is as follows:

[0030] 1. Routine monitoring.

[0031] During daily use, the pressure of sampling tube 1 is monitored in real time by the negative pressure vacuum gauge 21 on the connecting pipe 2. When the measured value of the negative pressure vacuum gauge 21 is abnormal, the type of fault that may occur in the pipeline is determined based on the measured value, such as breakage, disconnection or blockage.

[0032] 2. Positive pressure detection.

[0033] Perform positive pressure checks regularly. Close the switch valve at the end of sampling tube 1, and remotely control the three-way valve 5 via the controller to connect sampling tube 1 and high-pressure tube 4. Turn on the high-pressure gas supply device, adjust the gas pressure through the pressure reducing valve 41, and observe the changes in the positive pressure gauge reading. Determine the continuity of the sampling tube based on these changes. If a blockage is found in the pipeline, the positive pressure can be used to clear the blockage.

[0034] 3. Locate the leak point.

[0035] When a leak is detected in sampling tube 1, the controller sequentially opens the valves between the two adjacent sampling tubes and detects pressure changes. Based on the pressure changes, the leak point is quickly located, and precise replacement and repair are performed.

[0036] Of course, the above description is not intended to limit the present utility model, and the present utility model is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present utility model should also fall within the protection scope of the present utility model.

Claims

1. A downhole tubing inspection device, characterized in that: The sampling system is positioned between the main pipe bundle and the system sampling cabinet. The main pipe bundle includes multiple sampling tubes extending to different key areas downhole. The system sampling cabinet is equipped with multiple sampling ports corresponding to the multiple sampling tubes. The downhole tubing testing device includes a connecting pipe between the sampling port and its corresponding sampling tube; each connecting pipe is equipped with a negative pressure vacuum gauge. A filter for filtering moisture and impurities is also installed on the connecting pipeline between the negative pressure vacuum gauge and the sampling tube; It also includes a high-pressure pipe, a pressure reducing valve installed on the high-pressure pipe, and a positive pressure gauge; the end of the sampling pipe is provided with a switch valve; The inlet end of the high-pressure pipe is connected to a high-pressure gas supply device, and its outlet end is connected in parallel with the connecting pipeline to the sampling pipe. A three-way valve is provided at the connection point of the three. The sampling pipe and the connecting pipeline or the sampling pipe and the high-pressure pipe are switched and connected through the three-way valve.

2. The downhole tubing inspection device according to claim 1, characterized in that: The main beam is provided in multiple groups; Each high-pressure pipe has multiple high-pressure main branch pipes connected in parallel; the number of high-pressure main branch pipes corresponds to the number of main pipe bundles; each high-pressure main branch pipe has multiple high-pressure branch pipes connected in parallel, and each high-pressure branch pipe is connected to a corresponding three-way valve.

3. The downhole tubing inspection device according to claim 1, characterized in that: A filter is installed at the air inlet end of the high-pressure pipe.

4. The downhole tubing inspection device according to claim 1, characterized in that: The three-way valve is an electromagnetic valve, which is connected to the controller signal, enabling remote control of its opening and closing.

5. The downhole tubing inspection device according to claim 1, characterized in that: Each sampling tube consists of multiple sampling sub-tubes of fixed length connected together, and a switch valve is provided between two adjacent sampling sub-tubes.

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