Oil casing and conveying pipeline detection system

Abstract

The invention discloses an oil casing and conveying pipeline detection system, and belongs to the technical field of coal bed gas extraction and conveying pipe fitting detection. The invention aims to provide a detection system capable of conveniently and safely detecting whether an oil casing and a conveying pipeline are qualified or not. According to the technical scheme, the device comprises a pressure supply part, a first pipeline, an airtight and internal pressure detection test part and an external pressure detection test part, one end of the first pipeline is connected with the pressure supply part, and the other end of the first pipeline is connected with the airtight and internal pressure detection test part and the external pressure detection test part; the first to-be-detected pipe fitting is located in the airtightness and internal pressure detection test part, the interior of the first to-be-detected pipe fitting is communicated with one end of the second pipeline, and the other end of the second pipeline is connected with the first pipeline; a second to-be-detected pipe fitting is sleeved in a pressure-bearing outer pipe of the external pressure detection test part, an annular space between the second to-be-detected pipe fitting and the pressure-bearing outer pipe is sealed and is communicated with one end of a third pipeline, and the other end of the third pipeline is also connected with the first pipeline; the device is used for detecting the oil casing or the conveying pipeline.

Description

Technical Field

[0001] The invention discloses an oil casing and transmission pipeline detection system, belonging to the technical field of coal bed gas mining and transmission pipe detection. Background Art

[0002] CBM wells all use casing cementing. Due to the dual influence of geological factors such as bottom hole temperature, pressure, fluid corrosion, and engineering factors such as fracturing, perforation, and drainage, with the long-term drainage development of coalbed methane fields, the geological activities in the deep underground parts have intensified, and the formation slippage, sand production, frequent underground operations, casing materials, corrosion, and coal mining operations in coal mines have made the working conditions of the oil casing in coalbed methane wells worse and worse. At present, the number of gas wells with oil casing defects and the degree of damage are increasing rapidly. Therefore, the detection and analysis and processing capabilities of oil casing defects have become a key factor in promoting the development of the coalbed methane industry. In addition, the quality inspection of the transmission pipeline also provides safety guarantees for the transportation of coalbed methane.

[0003] Regarding the inspection of oil casing and transmission pipelines, on the one hand, the factory inspection of new oil casing and transmission pipelines varies due to the different manufacturers, and the inspection equipment and sampling inspection rate adopted are different. The user unit needs to conduct sampling inspection before applying them to gas wells to prevent quality problems from affecting the production of gas wells. On the other hand, the reused oil casing and transmission pipelines are in a special working environment for a long time, so they should also be sampled and inspected before reuse.

[0004] Common basic types of oil casing damage include casing deformation, casing rupture, casing dislocation, corrosion perforation and sealing damage at the joints. Currently, there are more than 20,000 coalbed methane extraction wells in the country, and the utilization of oil casing and transmission pipelines is large. In order to ensure the safety of coalbed methane extraction and transportation and avoid casing damage wells affecting the production capacity of coalbed methane wells, it is urgent to develop a set of oil casing and transmission pipeline detection technology platforms to facilitate coalbed methane production units to conduct routine detection of oil casing damage and meet the needs of safe production. Summary of the invention

[0005] In view of the deficiencies in the prior art, the object of the present invention is to provide a detection system that can conveniently and safely detect whether oil casing and transmission pipelines are qualified.

[0006] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: an oil casing and transmission pipeline detection system, comprising a pressure supply part, a first pipeline, an airtight and internal pressure detection test part and an external pressure detection test part, the pressure supply part comprises a water injection pump, a high-pressure pump and a high-pressure air pump, the water inlet end of the water injection pump and the high-pressure pump is connected to a water pool, the water outlet end of the water injection pump and the high-pressure pump and the air outlet end of the high-pressure air pump are connected to one end of the first pipeline, and the other end of the first pipeline is connected to the airtight and internal pressure detection test part and the external pressure detection test part;

[0007] Two unloading valves are installed on the first pipeline, one close to the pressure supply part is the pump end unloading valve, and the other is the pipe fitting unloading valve;

[0008] The first pipe to be inspected is located in the airtightness and internal pressure detection test part, one end of the first pipe to be inspected is closed, the other end is sealed and internally connected to one end of the second pipeline, and the other end of the second pipeline is connected to the first pipeline;

[0009] One end of the second pipe to be inspected is sealed and sleeved into the pressure-bearing outer tube of the external pressure detection test part. The annulus between the second pipe to be inspected and the pressure-bearing outer tube is sealed and connected to one end of the third pipeline. The other end of the third pipeline is also connected to the first pipeline.

[0010] The second pipeline is installed with a first pneumatic stop valve, a first pressure sensor and a first pressure gauge, and the first pressure sensor and the first pressure gauge are located between the first pneumatic stop valve and the first pipe to be inspected;

[0011] The third pipeline is installed with a second pneumatic stop valve, a second pressure sensor and a second pressure gauge, and the second pressure sensor and the second pressure gauge are located between the second pneumatic stop valve and the second pipe to be inspected.

[0012] Furthermore, the airtightness and internal pressure detection test section includes a first test tank, a first light rail and a first load-bearing trolley. The first light rail is laid at the bottom of the first test tank, and a plurality of first load-bearing trolleys are installed on the first light rail. The first pipe to be inspected is horizontally placed on the first load-bearing trolley. One end of the first pipe to be inspected is connected to a plug, and the other end is connected to a casing cap. A high-pressure gas inlet is provided on the casing cap, and the high-pressure gas inlet is connected to the second pipeline.

[0013] The external pressure detection test section includes a second test tank, a second light rail, a second load-bearing trolley and a pressure-bearing outer tube. The second light rail is laid at the bottom of the second test tank. A plurality of second load-bearing trolleys are installed on the second light rail. One end of the pressure-bearing outer tube is open and the other end is closed. The pressure-bearing outer tube is horizontally placed on the second load-bearing trolley. One end of the second pipe to be inspected is connected to a plug and then sleeved into the pressure-bearing outer tube. The space between the outer wall of the second pipe to be inspected and the inner wall of the pressure-bearing outer tube is an annulus. The other end of the second pipe to be inspected is connected to the open end of the pressure-bearing outer tube through a casing head and the annulus is sealed. A high-pressure fluid inlet connected to the annulus is provided on the casing head, and the high-pressure fluid inlet is connected to the third pipeline.

[0014] Furthermore, the sleeve cap is provided with an exhaust outlet, which is connected to the exhaust valve; the sleeve head is provided with a pressure relief outlet, which is connected to the drain valve.

[0015] Furthermore, a plurality of first monitoring cameras are installed on both sides of the top of the first test tank, and a plurality of second monitoring cameras are installed on both sides of the top of the second test tank.

[0016] Furthermore, the first pipe to be inspected is two oil casing or transmission pipelines connected by a coupling, and the second pipe to be inspected is a single oil casing or transmission pipeline.

[0017] Furthermore, the first carrying trolley is provided with a first arc-shaped support platform adapted to the shape of the first pipe to be inspected, and the second carrying trolley is provided with a second arc-shaped support platform adapted to the shape of the pressure-bearing outer pipe.

[0018] Furthermore, the first test trough and the second test trough are both rectangular pits. The first test trough is 25m long, 1.5m wide and 1.2m deep, and the second test trough is 15m long, 1.5m wide and 1.2m deep.

[0019] Furthermore, the present invention also includes a microcomputer high voltage testing system;

[0020] The microcomputer high-pressure test system is connected to the water injection pump, high-pressure pump, and high-pressure air pump and is used to control the start and stop;

[0021] The microcomputer high-pressure test system is connected with the pump end unloading valve, the pipe unloading valve, the first pneumatic stop valve, the second pneumatic stop valve, the exhaust valve, and the drain valve to control the opening and closing of each valve;

[0022] The microcomputer high-voltage test system is connected to the first pressure sensor and the second pressure sensor to receive pressure value information;

[0023] The microcomputer high voltage test system is connected with the first monitoring camera and the second monitoring camera and is used for receiving and playing video information.

[0024] Furthermore, the present invention also includes an air pump, which is connected to the pump end unloading valve, the pipe unloading valve, the first pneumatic stop valve, the second pneumatic stop valve, the exhaust valve, and the drain valve and provides power for opening and closing each valve.

[0025] Furthermore, a water injection check valve is installed at the water outlet of the water injection pump, a low-pressure check valve, a safety valve and a high-pressure check valve are installed in sequence at the air outlet of the high-pressure air pump, and a check valve is installed between the pump end unloading valve and the pipe unloading valve.

[0026] Compared with the prior art, the present invention has the following beneficial effects.

[0027] 1. The pressure supply part in the present invention can provide not only high-pressure air, but also high-pressure water, and can also provide a mixed high-pressure fluid of air and water, which can well simulate the working environment of casing under drilling. The airtightness and internal pressure detection test part and the external pressure detection test part can perform internal pressure resistance, external pressure resistance and airtightness detection on the pipes to be inspected. In this way, the present invention can be used by coalbed methane extraction enterprises to conduct sampling inspections on newly purchased oil casing and transmission pipelines, and to conduct full inspections on reused oil casing and transmission pipelines, and can simultaneously realize the detection of resistance to internal pressure, coupling sealing and resistance to external pressure, thereby providing safety guarantee for the extraction and transportation of coalbed methane.

[0028] 2. The present invention adopts a microcomputer high-pressure test system, which can realize automatic control of various valves and pumps, and can also receive pressure information and video monitoring information in real time. It has a high degree of automation and strong expandability. It can observe test details from multiple angles throughout the process and save data. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments are briefly introduced below.

[0030] Figure 1 It is a structural schematic diagram of the present invention.

[0031] Figure 2 It is a structural schematic diagram of the airtightness and internal pressure detection test part in the present invention.

[0032] Figure 3 It is a schematic structural diagram of the first load-bearing trolley in the present invention.

[0033] Figure 4 It is a structural schematic diagram of the external pressure detection test part in the present invention.

[0034] Figure 5 It is a schematic structural diagram of the second load-bearing trolley in the present invention.

[0035] In the figure: 11 is a water injection pump, 12 is a high-pressure pump, 13 is a high-pressure air pump, 14 is a water tank, 15 is a water injection check valve, 16 is a low-pressure check valve, 17 is a safety valve, 18 is a high-pressure check valve, 2 is a first pipeline, 21 is a pump end unloading valve, 22 is a pipe unloading valve, 23 is a check valve, 3 is an airtight and internal pressure detection test section, 31 is a first test tank, 32 is a first light rail 32, 33 is a first bearing trolley, 331 is a first arc support platform, 34 is a first monitoring camera, 4 is an external pressure detection test section, 41 is a second test tank, 42 ​​is a second light rail, 43 is a second bearing trolley, 431 is a first arc support platform, 44 is a first monitoring camera, 45 is a first external pressure detection test section, 46 is a second test tank, 47 is a second light rail, 48 is a second bearing trolley, 49 is a second external pressure detection test section, 50 is a second external pressure detection test section, 51 is a second external pressure detection test section, 52 is a second external pressure detection test section, 53 is a second external pressure detection test section, 54 is a second external pressure detection test section, 55 is a second external pressure detection test section, 56 is a second external pressure detection test section, 57 is a second external pressure detection test section, 58 is a second external pressure detection test section, 59 is a second external pressure detection test section, 60 is a second external pressure detection test section, 61 is a second external pressure detection test section, 62 is a second external pressure detection test section, 63 is a second external pressure detection test section, 64 is a second external pressure detection test section, 65 is a second external pressure detection test section, 66 is a second external pressure detection test section, 67 is a second external pressure is the second arc-shaped support platform, 44 is the pressure-bearing outer pipe, 45 is the annulus, 46 is the second monitoring camera, 5 is the first pipe to be inspected, 51 is the casing cap, 52 is the high-pressure gas inlet, 53 is the exhaust outlet, 54 is the exhaust valve, 6 is the second pipeline, 61 is the first pneumatic stop valve, 62 is the first pressure sensor, 63 is the first pressure gauge, 7 is the second pipe to be inspected, 71 is the casing head, 72 is the high-pressure fluid inlet, 73 is the pressure relief outlet, 74 is the drain valve, 8 is the third pipeline, 81 is the second pneumatic stop valve, 82 is the second pressure sensor, 83 is the second pressure gauge, and 9 is a microcomputer high-pressure testing system. DETAILED DESCRIPTION

[0036] The technical solution of the present invention is described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] The present invention provides the following embodiments.

[0038] like Figure 1 As shown, the present invention is a detection system for oil casing and transmission pipeline, comprising a pressure supply part, a first pipeline 2, an airtightness and internal pressure detection test part 3 and an external pressure detection test part 4, wherein the pressure supply part comprises a water injection pump 11, a high-pressure pump 12 and a high-pressure air pump 13, the water inlet ends of the water injection pump 11 and the high-pressure pump 12 are connected to a water pool 14, the water outlet ends of the water injection pump 11 and the high-pressure pump 12 and the air outlet end of the high-pressure air pump 13 are all connected to one end of the first pipeline 2, and the other end of the first pipeline 2 is connected to the airtightness and internal pressure detection test part 3 and the external pressure detection test part 4;

[0039] Two unloading valves are installed on the first pipeline 2, the one close to the pressure supply part is the pump end unloading valve 21, and the other is the pipe unloading valve 22;

[0040] The first pipe 5 to be inspected is located in the airtight and internal pressure detection test part 3. One end of the first pipe 5 to be inspected is closed, and the other end is sealed and internally connected to one end of the second pipeline 6. The other end of the second pipeline 6 is connected to the first pipeline 2.

[0041] One end of the second pipe to be inspected 7 is sealed and sleeved into the pressure-bearing outer tube 44 of the external pressure detection test part 4. The annulus 45 between the second pipe to be inspected 7 and the pressure-bearing outer tube 44 is sealed and connected to one end of the third pipeline 8. The other end of the third pipeline 8 is connected to the first pipeline 2.

[0042] The second pipeline 6 is installed with a first pneumatic stop valve 61, a first pressure sensor 62 and a first pressure gauge 63, and the first pressure sensor 62 and the first pressure gauge 63 are located between the first pneumatic stop valve 61 and the first pipe 5 to be inspected;

[0043] The third pipeline 8 is installed with a second pneumatic stop valve 81 , a second pressure sensor 82 and a second pressure gauge 83 . The second pressure sensor 82 and the second pressure gauge 83 are located between the second pneumatic stop valve 81 and the second pipe 7 to be inspected.

[0044] The pressure supply part in the present invention can provide not only high-pressure air, but also high-pressure water, and can also provide a mixed high-pressure fluid of air and water, which can well simulate the working environment of casing under drilling. The airtightness and internal pressure detection test part 3 and the external pressure detection test part 4 can perform internal pressure resistance, external pressure resistance and airtightness detection on the pipe to be inspected. In this way, the coalbed methane mining enterprise can conveniently perform various tests on the oil casing that are very close to the actual working conditions, ensure that the oil casing is qualified, and ensure the safe and stable extraction of coalbed methane.

[0045] like Figure 2 , Figure 3 As shown, the airtightness and internal pressure detection test part 3 includes a first test tank 31, a first light rail 32 and a first carrying trolley 33. The first light rail 32 is laid at the bottom of the first test tank 31, and multiple first carrying trolleys 33 are installed on the first light rail 32. The first pipe 5 to be inspected is horizontally placed on the first carrying trolley 33. One end of the first pipe 5 to be inspected is connected to a plug, and the other end is connected to a casing cap 51. The casing cap 51 is provided with a high-pressure gas inlet 52, and the high-pressure gas inlet 52 is connected to the second pipeline 6; the casing cap 51 is connected to the first pipe 5 to be inspected by a threaded connection, and the casing cap 51 needs to be equipped with multiple different specifications to meet the inspection requirements of oil casing, transmission pipelines or other pressure vessels of different specifications.

[0046] like Figure 4 , Figure 5As shown, the external pressure detection test part 4 includes a second test tank 41, a second light rail 42, a second load-bearing trolley 43 and a pressure-bearing outer tube 44. The second light rail 42 is laid at the bottom of the second test tank 41, and multiple second load-bearing trolleys 43 are installed on the second light rail 42. One end of the pressure-bearing outer tube 44 is open and the other end is closed. The pressure-bearing outer tube 44 is horizontally placed on the second load-bearing trolley 43. One end of the second pipe to be inspected 7 is connected to the plug and then sleeved in the pressure-bearing outer tube 44. The space between the outer wall of the second pipe to be inspected 7 and the inner wall of the pressure-bearing outer tube 44 is an annulus 45. The other end of the second pipe to be inspected 7 is connected to the open end of the pressure-bearing outer tube 44 through a casing head 71 to seal the annulus 45. The casing head 71 is provided with a high-pressure fluid inlet 72 connected to the annulus 45, and the high-pressure fluid inlet 72 is connected to the third pipeline 8. The casing head 71 is threadedly connected to the pressure-bearing outer tube 44 and the second pipe to be inspected 7. As existing parts, the casing head 71 needs to be equipped with multiple casing heads of different specifications to meet the inspection requirements of oil casing, transmission pipelines or other pressure vessels of different specifications.

[0047] The first test tank 31 and the second test tank 41 are respectively provided with a first carrying trolley 33 and a second carrying trolley 43 that can move, so as to conveniently adjust the positions of the first pipe 5 and the second pipe 7 to be inspected for connection operation.

[0048] The sleeve cap 51 is also provided with an exhaust outlet 53 , which is connected to an exhaust valve 54 . The sleeve head 71 is also provided with a pressure relief outlet 73 , which is connected to a drain valve 74 .

[0049] A plurality of first monitoring cameras 34 are installed on both sides of the top of the first test tank 31, and a plurality of second monitoring cameras 46 are installed on both sides of the top of the second test tank 41. The number of the first monitoring cameras 34 can be 6, and the number of the second monitoring cameras 46 can be 4, all of which are used to remotely monitor the detection process, avoiding the safety risk of close-range monitoring by personnel.

[0050] The first pipe to be inspected 5 is two oil casing or transmission pipelines connected by a coupling, and the second pipe to be inspected 7 is a single oil casing or transmission pipeline.

[0051] like Figure 3 , Figure 5 As shown, the first carrying trolley 33 is provided with a first arc-shaped support platform 331 adapted to the shape of the first pipe 5 to be inspected, and the second carrying trolley 43 is provided with a second arc-shaped support platform 431 adapted to the shape of the pressure-bearing outer tube 44.

[0052] The first test trough 31 and the second test trough 41 are both rectangular pits. The first test trough 31 is 25 m long, 1.5 m wide and 1.2 m deep, and the second test trough 41 is 15 m long, 1.5 m wide and 1.2 m deep.

[0053] The first test tank 31 in the air tightness and internal pressure detection test part 3 is a rectangular pit with a length of 25m, which can accommodate two oil casings connected by couplings. In this way, not only the internal pressure resistance of the oil casing can be tested, but also the air tightness of the coupling can be tested at the same time. The external pressure detection test part 4 includes a pressure-bearing outer pipe 44, which can accommodate the second pipe 7 to be tested. After injecting high-pressure fluid into the annulus 45, the external pressure resistance of the second pipe 7 to be tested can be tested. In addition, the first test tank 31 and the second test tank 41 are both pits, and multiple first monitoring cameras 34 and second monitoring cameras 46 are installed on the top, respectively. An exhaust valve 54 and a drain valve 74 are also set, which fully considers the safety risks in the detection process to ensure the smooth progress of the detection.

[0054] like Figure 1 As shown, the present invention also includes a microcomputer high voltage testing system 9;

[0055] The microcomputer high-voltage test system 9 is connected to the water injection pump 11, the high-pressure pump 12, and the high-pressure air pump 13 and controls the start and stop;

[0056] The microcomputer high-pressure test system 9 is connected to the pump end unloading valve 21, the pipe unloading valve 22, the first pneumatic stop valve 61, the second pneumatic stop valve 81, the exhaust valve 54, and the drain valve 74 to control the opening and closing of each valve;

[0057] The microcomputer high-voltage test system 9 is connected to the first pressure sensor 62 and the second pressure sensor 82 to receive and display pressure value information;

[0058] The microcomputer high voltage test system 9 is connected to the first monitoring camera 34 and the second monitoring camera 46 for receiving and playing video information.

[0059] The microcomputer high-voltage test system 9 is a test device used in a high-voltage environment, which can realize real-time pressure detection, data recording and printing functions, ensure the stability and reliability of the test process, and the system sets parameters through human-computer dialogue, automatically completes operations such as pressure increase, pressure maintenance, shutdown, unloading and alarm exhaust, and records and prints test results. This system is a prior art.

[0060] The present invention also includes an air pump, which is connected to the pump end unloading valve 21, the pipe unloading valve 22, the first pneumatic stop valve 61, the second pneumatic stop valve 81, the exhaust valve 54, and the drain valve 74 to provide power for opening and closing each valve.

[0061] like Figure 1As shown, a water injection check valve 15 is installed at the water outlet end of the water injection pump 11, a low-pressure check valve 16, a safety valve 17 and a high-pressure check valve 18 are installed in sequence at the air outlet end of the high-pressure air pump 13, and a check valve 23 is installed between the pump end unloading valve 21 and the pipe unloading valve 22.

[0062] The first test tank 31 and the second test tank 41 in the present invention should be treated with anti-seepage and hardening treatment on their surroundings and bottoms, and a crane or lifting device should be provided on the top to facilitate the movement of the pipes to be tested.

[0063] The specific detection process of the present invention is as follows.

[0064] 1. Air tightness and internal pressure detection

[0065] First, the first pipe 5 to be inspected is lifted onto the first load-bearing trolley 33 in the first test tank 31 by a lifting device, and then one end of the first pipe 5 to be inspected is closed with a plug, and the other end is connected to the sleeve cap 51 and connected to the second pipeline 6. After that, the personnel evacuate and the inspection procedure is started according to the following steps: close the pipe unloading valve 22, open the first pneumatic stop valve 61, start the high-pressure air pump 13, close the pump-end unloading valve 21, and high-pressure air enters the first pipe 5 to be inspected through the first pipeline 2 and the second pipeline 6 and increases the pressure. The first pressure sensor 62 and the first pressure gauge 63 detect and display the pressure value in real time. After reaching the target pressure value, open the pump-end unloading valve 21, close the first pneumatic stop valve 61 (the pump-end unloading valve 21 is opened for a delay of 1 second), and the high-pressure air pump 13 is stopped to maintain the pressure. After the pressure-maintaining time is reached, open the first pneumatic stop valve 61, open the pipe unloading valve 22 to release the pressure, and the inspection is completed.

[0066] 2. External pressure detection

[0067] First, the second pipe to be inspected 7 is hoisted to the second carrying trolley 43 in the second test tank 41 by a hoisting device, and then one end of the second pipe to be inspected 7 is sealed with a plug and inserted into the pressure-bearing outer tube 44. The other end of the second pipe to be inspected 7 is connected to the open end of the pressure-bearing outer tube 44 through a casing head 71. The casing head 71 seals the annulus 45 between the second pipe to be inspected 7 and the pressure-bearing outer tube 44. The interior of the second pipe to be inspected 7 is connected to the outside world. Then, after the third pipeline 8 is connected through the high-pressure fluid inlet 72, the personnel are evacuated and the inspection procedure is started according to the following steps: close the pipe unloading valve 22, open the second gas inlet 72, and then close the pipe unloading valve 22. Move the stop valve 81, start the water injection pump 11, close the pump end unloading valve 21, and inject water into the annulus 45 through the first pipeline 2 and the third pipeline 8. After the annulus 45 is filled with water, start the high-pressure pump 12, and the pressure in the annulus 45 increases. The second pressure sensor 82 and the second pressure gauge 83 detect and display the pressure value in real time. After reaching the target pressure value, open the pump end unloading valve 21, close the second pneumatic stop valve 81 (delay of 1 second after the pump end unloading valve 21 is opened), stop the water injection pump 11 and the high-pressure pump 12, and maintain the pressure. After the pressure maintaining time is reached, open the second pneumatic stop valve 81, open the pipe unloading valve 22 to release the pressure, and the detection is completed.

[0068] During the airtightness and internal pressure testing, the pressure must be able to reach 20Mpa. During the external pressure testing, the pressure must be able to reach 100Mpa. The pressure-bearing outer tube 44 is a special pressure vessel made of 16Mn.

[0069] During the above-mentioned testing process, when the test pressure is ≤5MPa, the allowable pressure drop is ≤0.1MPa, and the pressure holding time is 10 minutes; when the test pressure is between 5-100MPa, the allowable pressure drop is ≤0.5MPa, and the pressure holding time is 10 minutes; if the pressure drop does not meet the above standards, it means that the pipe fitting to be inspected has leakage and is an unqualified pipe fitting. If it is an oil casing, it cannot be used in coalbed methane wells; if it is a transmission pipeline, it cannot be used for gathering and transporting coalbed methane.

[0070] The detection procedures in the above two test processes can be controlled manually or automatically by the microcomputer high-voltage test system 9. After the detection is completed, the microcomputer high-voltage test system 9 automatically saves the relevant data of the current detection, and data query, curve regeneration and print output can be performed through the data management window.

[0071] In addition, the microcomputer high-voltage test system 9 also has real-time fault alarm and handling functions. When abnormal conditions such as overpressure and overload occur, it will automatically send out an alarm signal, control the high-pressure air pump 13 or the water injection pump 11, and the high-pressure pump 12 to shut down, open the exhaust valve 54 or the drain valve 74 to relieve pressure, and display the description of the current fault phenomenon at the same time, so as to facilitate the staff to quickly find and eliminate the fault according to the prompts.

[0072] The invention can be used for detecting oil casing, or transmission pipeline, or other pressure vessels.

[0073] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. An oil casing and transmission pipeline detection system, characterized in that: The invention comprises a pressure supply part, a first pipeline (2), an airtightness and internal pressure detection test part (3) and an external pressure detection test part (4); the pressure supply part comprises a water injection pump (11), a high-pressure pump (12) and a high-pressure air pump (13); the water inlet ends of the water injection pump (11) and the high-pressure pump (12) are connected to a water pool (14); the water outlet ends of the water injection pump (11) and the high-pressure pump (12) and the air outlet end of the high-pressure air pump (13) are all connected to one end of the first pipeline (2); and the other end of the first pipeline (2) is connected to the airtightness and internal pressure detection test part (3) and the external pressure detection test part (4); Two unloading valves are installed on the first pipeline (2), one close to the pressure supply part is a pump end unloading valve (21), and the other is a pipe unloading valve (22); The first pipe to be inspected (5) is located in the airtight and internal pressure detection test part (3), one end of the first pipe to be inspected (5) is closed, the other end is sealed and internally connected to one end of the second pipeline (6), and the other end of the second pipeline (6) is connected to the first pipeline (2); One end of the second pipe to be inspected (7) is sealed and sleeved into the pressure-bearing outer tube (44) of the external pressure detection test part (4); the annulus (45) between the second pipe to be inspected (7) and the pressure-bearing outer tube (44) is sealed and connected to one end of the third pipeline (8); the other end of the third pipeline (8) is connected to the first pipeline (2); A first pneumatic stop valve (61), a first pressure sensor (62) and a first pressure gauge (63) are installed on the second pipeline (6), and the first pressure sensor (62) and the first pressure gauge (63) are located between the first pneumatic stop valve (61) and the first pipe (5) to be inspected; The third pipeline (8) is installed with a second pneumatic stop valve (81), a second pressure sensor (82) and a second pressure gauge (83); the second pressure sensor (82) and the second pressure gauge (83) are located between the second pneumatic stop valve (81) and the second pipe (7) to be inspected.

2. The oil casing and transmission pipeline detection system according to claim 1, characterized in that: The airtightness and internal pressure detection test section (3) comprises a first test tank (31), a first light rail (32) and a first load-bearing trolley (33). The first light rail (32) is laid at the bottom of the first test tank (31). A plurality of first load-bearing trolleys (33) are installed on the first light rail (32). A first pipe to be inspected (5) is horizontally placed on the first load-bearing trolley (33). One end of the first pipe to be inspected (5) is connected to a plug and the other end is connected to a sleeve cap (51). A high-pressure gas inlet (52) is provided on the sleeve cap (51). The high-pressure gas inlet (52) is connected to the second pipeline (6). The external pressure detection test section (4) comprises a second test tank (41), a second light rail (42), a second bearing trolley (43) and a pressure-bearing outer tube (44). The second light rail (42) is laid at the bottom of the second test tank (41). A plurality of second bearing trolleys (43) are installed on the second light rail (42). The pressure-bearing outer tube (44) has an open end and a closed end. The pressure-bearing outer tube (44) is horizontally placed on the second bearing trolley (43). The second pipe to be inspected (7 ) is connected to a plug and then sleeved into a pressure-bearing outer tube (44); the space between the outer wall of the second pipe member to be inspected (7) and the inner wall of the pressure-bearing outer tube (44) is an annulus (45); the other end of the second pipe member to be inspected (7) is connected to the open end of the pressure-bearing outer tube (44) through a casing head (71) and the annulus (45) is sealed; the casing head (71) is provided with a high-pressure fluid inlet (72) connected to the annulus (45); the high-pressure fluid inlet (72) is connected to the third pipeline (8).

3. The oil casing and transmission pipeline detection system according to claim 2, characterized in that: The sleeve cap (51) is also provided with an exhaust outlet (53), which is connected to an exhaust valve (54); the sleeve head (71) is also provided with a pressure relief outlet (73), which is connected to a drain valve (74).

4. The oil casing and transmission pipeline detection system according to claim 3, characterized in that: A plurality of first monitoring cameras (34) are installed on both sides of the top of the first test tank (31), and a plurality of second monitoring cameras (46) are installed on both sides of the top of the second test tank (41).

5. The oil casing and transmission pipeline detection system according to claim 1 or 2, characterized in that: The first pipe member (5) to be inspected is two oil casing or transmission pipelines connected by a coupling, and the second pipe member (7) to be inspected is a single oil casing or transmission pipeline.

6. The oil casing and transmission pipeline detection system according to claim 2, characterized in that: The first carrying trolley (33) is provided with a first arc-shaped support platform (331) adapted to the shape of the first pipe (5) to be inspected, and the second carrying trolley (43) is provided with a second arc-shaped support platform (431) adapted to the shape of the pressure-bearing outer pipe (44).

7. The oil casing and transmission pipeline detection system according to claim 2, characterized in that: The first test trough (31) and the second test trough (41) are both rectangular pits. The first test trough (31) is 25m long, 1.5m wide and 1.2m deep, while the second test trough (41) is 15m long, 1.5m wide and 1.2m deep.

8. The oil casing and transmission pipeline detection system according to claim 4, characterized in that: Also includes a microcomputer high voltage test system (9); The microcomputer high-pressure test system (9) is connected to the water injection pump (11), the high-pressure pump (12), and the high-pressure air pump (13) to control the start and stop; The microcomputer high-pressure test system (9) is connected to the pump end unloading valve (21), the pipe unloading valve (22), the first pneumatic stop valve (61), the second pneumatic stop valve (81), the exhaust valve (54), and the drain valve (74) to control the opening and closing of each valve; The microcomputer high-voltage test system (9) is connected to the first pressure sensor (62) and the second pressure sensor (82) and is used to receive and display pressure value information; The microcomputer high-voltage test system (9) is connected to the first monitoring camera (34) and the second monitoring camera (46) and is used to receive and play video information.

9. The oil casing and transmission pipeline detection system according to claim 3, characterized in that: It also includes an air pump, which is connected to the pump end unloading valve (21), the pipe unloading valve (22), the first pneumatic stop valve (61), the second pneumatic stop valve (81), the exhaust valve (54), and the drain valve (74) and provides power for opening and closing each valve.

10. An oil casing and transmission pipeline detection system according to claim 1 or 2, characterized in that: A water injection check valve (15) is installed at the water outlet end of the water injection pump (11), a low-pressure check valve (16), a safety valve (17) and a high-pressure check valve (18) are installed in sequence at the air outlet end of the high-pressure air pump (13), and a check valve (23) is installed between the pump end unloading valve (21) and the pipe unloading valve (22).

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