Remote control air-tight seal detection system and method

Abstract

The invention relates to a remote control air-tight seal detection system and method, and the system comprises an upper pressure cavity pipeline, a central cavity pipeline, a lower pressure cavity pipeline, an ultrasonic bubble meter, a water tank, a measuring cylinder, a motor, a test shaft, and an air-tight seal detection pipeline. The device comprises a first manual needle valve, a second manual needle valve, a third manual needle valve, a fourth manual needle valve, a fifth manual needle valve, a sixth manual needle valve, a first pneumatic valve, a second pneumatic valve, a third pneumatic valve, a fourth pneumatic valve and a fifth pneumatic valve. According to the invention, the underground tool can remotely meter the number of leaked bubbles in the gas seal test process, the device has the functions of remote collection and metering of leaked gas, and the gas leakage rate can be calculated through the gas leakage amount.

Description

Technical Field

[0001] The present invention relates to the field of indoor evaluation of downhole tools in oil and gas wells, and more particularly to a remote-controlled gas seal detection system and method. Background Art

[0002] As natural gas exploration and development progresses, an increasing number of ultra-high-pressure gas reservoirs are emerging, placing higher demands on the airtightness of downhole tools. Therefore, it is necessary to simulate the downhole environment and conduct airtightness testing on tools entering the well. In existing airtightness tests, the gas is highly compressed, and if a downhole tool leaks, it is impossible to determine the leak based on pressure. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a remote-controlled gas seal detection system and method, which can realize the remote measurement of the number of leaking bubbles during the gas seal test of downhole tools, and at the same time have the function of remote collection and measurement of leaked gas, and can calculate the gas leakage rate based on the gas leakage amount.

[0004] The technical solution adopted by the present invention to solve the technical problem is as follows: constructing a remote-controlled airtightness detection system, including an upper pressure chamber pipeline, a central chamber pipeline, a lower pressure chamber pipeline, an ultrasonic bubble counter, a water tank, a measuring cylinder, a motor, a test wellbore, an airtightness detection pipeline, a first manual needle valve, a second manual needle valve, a third manual needle valve, a fourth manual needle valve, a fifth manual needle valve, a sixth manual needle valve, a first pneumatic valve, a second pneumatic valve, a third pneumatic valve, a fourth pneumatic valve, and a fifth pneumatic valve; The first manual needle valve is arranged on the upper pressure chamber pipeline, and the upper pressure chamber pipeline is remotely controlled by the second pneumatic valve. The second manual needle valve and the fifth manual needle valve are arranged on the central chamber pipeline. The third manual needle valve and the fourth manual needle valve are arranged on the lower pressure chamber pipeline, and the central chamber pipeline and the lower pressure chamber pipeline are remotely controlled by the first pneumatic valve. The upper pressure chamber pipeline, the central chamber pipeline, and the lower pressure chamber pipeline are connected to the airtightness detection pipeline and are controlled by the sixth manual needle valve. The ultrasonic bubble counter is arranged on the airtightness detection pipeline and is respectively connected to the water tank and the measuring cylinder. The third pneumatic valve is arranged between the sixth manual needle valve and the ultrasonic bubble counter. The fourth pneumatic valve is arranged on the branch circuit between the third pneumatic valve and the sixth manual needle valve. The fifth pneumatic valve is arranged on the branch circuit between the ultrasonic bubble counter and the measuring cylinder. The motor is connected to the measuring cylinder, and the motor drives the measuring cylinder to move up and down.

[0005] In the above solution, the motor drives the measuring cylinder to move up and down through PLC remote control.

[0006] In the above solution, the first manual needle valve, the second manual needle valve, the third manual needle valve, the fourth manual needle valve, the fifth manual needle valve and the sixth manual needle valve are all manually controlled.

[0007] In the above solution, the first pneumatic valve, the second pneumatic valve, the third pneumatic valve, the fourth pneumatic valve and the fifth pneumatic valve are all remotely controlled by PLC.

[0008] The present invention also provides a detection method for the remote-controlled gas seal detection system. When performing a gas test, the first manual needle valve, the second manual needle valve, the third manual needle valve, and the sixth manual needle valve are in a normally open state, and the water tank and the ultrasonic bubble counter balance the liquid level through a U-shaped tube. When leak detection is performed on the central cavity and the upper pressure cavity, the fourth manual needle valve is closed and the fifth manual needle valve is opened. If the upper pressure chamber is pressurized and the central chamber is tested for leaks, the first and fourth pneumatic valves are remotely controlled to open, and the residual gas in the central chamber is emptied through the central chamber pipeline and the airtight detection pipeline. After the emptying is completed, the fourth pneumatic valve is closed and the fifth pneumatic valve is opened to balance the liquid levels inside and outside the measuring cylinder. The fifth pneumatic valve is closed and the third pneumatic valve is opened. The gas leaking from the upper pressure chamber to the central chamber can enter the ultrasonic bubble counter through the central chamber pipeline and the airtight detection pipeline. The ultrasonic bubble counter will count the bubbles generated by the gas entering the water, and the leaked gas enters the measuring cylinder through the ultrasonic bubble counter. After the leak detection is completed, the first and third pneumatic valves are closed, and the measuring cylinder is lifted by the motor to balance the liquid levels inside and outside the measuring cylinder, and the gas leakage amount can be read. If the central cavity is pressurized and the upper pressure cavity is tested for leaks, the second and fourth pneumatic valves are remotely controlled to open, and the residual gas in the upper pressure cavity is emptied through the upper pressure cavity pipeline and the air-tightness detection pipeline. After the emptying is completed, the fourth pneumatic valve is closed and the fifth pneumatic valve is opened to balance the liquid levels inside and outside the measuring cylinder. The fifth pneumatic valve is closed and the third pneumatic valve is opened. The gas leaking from the central cavity to the upper pressure cavity can enter the ultrasonic bubble counter through the upper pressure cavity pipeline and the air-tightness detection pipeline. The ultrasonic bubble counter will count the bubbles generated by the gas entering the water, and the leaked gas enters the measuring cylinder through the ultrasonic bubble counter. After the leak detection is completed, the second and third pneumatic valves are closed, and the measuring cylinder is lifted by the motor to balance the liquid levels inside and outside the measuring cylinder, so that the gas leakage amount can be read.

[0009] The present invention also provides another detection method of the remote-controlled airtightness detection system, wherein the first manual needle valve, the second manual needle valve, the third manual needle valve, and the sixth manual needle valve are in a normally open state, and the water tank and the ultrasonic bubble counter balance the liquid level through a U-shaped tube; when leak detection is performed on the lower pressure chamber and the upper pressure chamber, the fifth manual needle valve is closed and the third manual needle valve is opened; If the upper pressure chamber is pressurized and the lower pressure chamber is tested for leaks, the first and fourth pneumatic valves are remotely controlled to open, and the residual gas in the lower pressure chamber is emptied through the lower pressure chamber pipeline and the airtight detection pipeline. After the emptying is completed, the fourth pneumatic valve is closed and the fifth pneumatic valve is opened to balance the liquid levels inside and outside the measuring cylinder. The fifth pneumatic valve is closed and the third pneumatic valve is opened. The gas leaking from the upper pressure chamber to the lower pressure chamber can enter the ultrasonic bubble counter through the lower pressure chamber pipeline and the airtight detection pipeline. The ultrasonic bubble counter will count the bubbles generated by the gas entering the water, and the leaked gas enters the measuring cylinder through the ultrasonic bubble counter. After the leak detection is completed, the first and third pneumatic valves are closed, and the measuring cylinder is lifted by the motor to balance the pages inside and outside the measuring cylinder, and the gas leakage amount can be read. If the lower pressure chamber is pressurized and the upper pressure chamber is tested for leaks, the second and fourth pneumatic valves are remotely controlled to open, and the residual gas in the upper pressure chamber is emptied through the upper pressure chamber pipeline and the air-tightness detection pipeline. After the emptying is completed, the fourth pneumatic valve is closed and the fifth pneumatic valve is opened to balance the liquid levels inside and outside the measuring cylinder. The fifth pneumatic valve is closed and the third pneumatic valve is opened. The gas leaking from the lower pressure chamber to the upper pressure chamber can enter the ultrasonic bubble counter through the upper pressure chamber pipeline and the air-tightness detection pipeline. The ultrasonic bubble counter will count the bubbles generated by the gas entering the water, and the leaked gas enters the measuring cylinder through the ultrasonic bubble counter. After the leak detection is completed, the second and third pneumatic valves are closed, and the measuring cylinder is lifted by the motor to balance the liquid levels inside and outside the measuring cylinder, so that the gas leakage amount can be read.

[0010] The remote control airtightness detection system of the present invention has the following beneficial effects: 1. The present invention can remotely count the bubbles leaking from the tool through an ultrasonic bubble counter; 2. The present invention can realize the gas leak detection function of three cavities by switching valves; 3. The present invention can use a measuring cylinder to remotely collect leaking gas, and the leakage rate can be calculated based on the collected gas volume and time. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which: Figure 1 It is a structural diagram of the remote control airtightness detection system of the present invention. DETAILED DESCRIPTION

[0012] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0013] like Figure 1 As shown, the remote control airtightness detection system of the present invention It includes an upper pressure chamber pipeline 1, a central chamber pipeline 2, a lower pressure chamber pipeline 3, an ultrasonic bubble counter 4, a water tank 5, a measuring cylinder 6, a motor 7, a test wellbore 8, an airtightness detection pipeline 9, a first manual needle valve R1, a second manual needle valve R2, a third manual needle valve R3, a fourth manual needle valve R4, a fifth manual needle valve R5, a sixth manual needle valve R6, a first pneumatic valve RV1, a second pneumatic valve RV2, a third pneumatic valve RV3, a fourth pneumatic valve RV4, and a fifth pneumatic valve RV5.

[0014] The first manual needle valve R1 is located on the upper pressure chamber pipeline 1, which is remotely controlled by the second pneumatic valve RV2. The second and fifth manual needle valves R2 and R5 are located on the central pressure chamber pipeline 2. The third and fourth manual needle valves R3 and R4 are located on the lower pressure chamber pipeline 3, which are remotely controlled by the first pneumatic valve RV1. The upper pressure chamber pipelines 1, 2, and 3 are connected to the airtightness detection pipeline 9 and controlled by the sixth manual needle valve R6. The ultrasonic bubble counter 4 is located on the airtightness detection pipeline 9 and is connected to the water tank 5 and the graduated cylinder 6, respectively. The third pneumatic valve RV3 is located between the sixth manual needle valve R6 and the ultrasonic bubble counter 4. The fourth pneumatic valve RV4 is located in the branch circuit between the third pneumatic valve RV3 and the sixth manual needle valve R6. The fifth pneumatic valve RV5 is provided on a branch circuit between the ultrasonic bubble counter 4 and the measuring cylinder 6 . The motor 7 is connected to the measuring cylinder 6 , and the motor 7 drives the measuring cylinder 6 to move up and down.

[0015] Preferably, the motor 7 drives the measuring cylinder 6 to move up and down through PLC remote control.

[0016] Preferably, the first manual needle valve R1 , the second manual needle valve R2 , the third manual needle valve R3 , the fourth manual needle valve R4 , the fifth manual needle valve R5 , and the sixth manual needle valve R6 are all manually controlled.

[0017] Preferably, the first pneumatic valve RV1 , the second pneumatic valve RV2 , the third pneumatic valve RV3 , the fourth pneumatic valve RV4 , and the fifth pneumatic valve RV5 are all remotely controlled by PLC.

[0018] The present invention also provides a detection method for a remotely controlled gas seal detection system. When performing a gas test, the first manual needle valve R1, the second manual needle valve R2, the third manual needle valve R3, and the sixth manual needle valve R6 are in a normally open state, and the water tank 5 and the ultrasonic bubble counter 4 balance the liquid level through a U-shaped tube. When leak detection is performed on the central cavity and the upper pressure cavity, the fourth manual needle valve R4 is closed and the fifth manual needle valve R5 is opened. If the upper pressure chamber is pressurized and the central chamber is tested for leaks, the first pneumatic valve RV1 and the fourth pneumatic valve RV4 are remotely controlled to open, and the residual gas in the central chamber is emptied through the central chamber pipeline 2 and the airtight detection pipeline 9. After the emptying is completed, the fourth pneumatic valve RV4 is closed, and the fifth pneumatic valve RV5 is opened to balance the liquid levels inside and outside the measuring cylinder 6. The fifth pneumatic valve RV5 is closed, and the third pneumatic valve RV3 is opened. The gas leaking from the upper pressure chamber to the central chamber can enter the ultrasonic bubble counter 4 through the central chamber pipeline 2 and the airtight detection pipeline 9. The ultrasonic bubble counter 4 will count the bubbles generated by the gas entering the water, and the leaked gas enters the measuring cylinder 6 through the ultrasonic bubble counter 4. After the leak detection is completed, the first pneumatic valve RV1 and the third pneumatic valve RV3 are closed, and the measuring cylinder 6 is lifted by the motor 7 to balance the liquid levels inside and outside the measuring cylinder, and the gas leakage amount can be read; If the central cavity is pressurized and the upper pressure cavity is tested for leaks, the second pneumatic valve RV2 and the fourth pneumatic valve RV4 are remotely controlled to open, and the residual gas in the upper pressure cavity is emptied through the upper pressure cavity pipeline 1 and the air-tightness detection pipeline 9. After the emptying is completed, the fourth pneumatic valve RV4 is closed, and the fifth pneumatic valve RV5 is opened to balance the liquid levels inside and outside the measuring cylinder 6. The fifth pneumatic valve RV5 is closed, and the third pneumatic valve RV3 is opened. The gas leaking from the central cavity to the upper pressure cavity can enter the ultrasonic bubble counter 4 through the upper pressure cavity pipeline 1 and the air-tightness detection pipeline 9. The ultrasonic bubble counter 4 will count the bubbles generated by the gas entering the water, and the leaked gas enters the measuring cylinder 6 through the ultrasonic bubble counter 4. After the leak detection is completed, the second pneumatic valve RV2 and the third pneumatic valve RV3 are closed, and the measuring cylinder 6 is lifted by the motor 7 to balance the liquid levels inside and outside the measuring cylinder, and the gas leakage amount can be read.

[0019] The present invention also provides another detection method of a remote-controlled airtightness detection system, wherein the first manual needle valve R1, the second manual needle valve R2, the third manual needle valve R3, and the sixth manual needle valve R6 are in a normally open state, and the water tank 5 and the ultrasonic bubble counter 4 balance the liquid level through a U-shaped tube; when leak detection is performed on the lower pressure chamber and the upper pressure chamber, the fifth manual needle valve R5 is closed and the third manual needle valve R4 is opened; If the upper pressure chamber is pressurized and the lower pressure chamber is tested for leaks, the first pneumatic valve RV1 and the fourth pneumatic valve RV4 are remotely controlled to open, and the residual gas in the lower pressure chamber is emptied through the lower pressure chamber pipeline 3 and the airtightness detection pipeline 9. After the emptying is completed, the fourth pneumatic valve RV4 is closed, and the fifth pneumatic valve RV5 is opened to balance the liquid levels inside and outside the measuring cylinder 6. The fifth pneumatic valve RV5 is closed, and the third pneumatic valve RV3 is opened. The gas leaking from the upper pressure chamber to the lower pressure chamber can enter the ultrasonic bubble counter 4 through the lower pressure chamber pipeline 3 and the airtightness detection pipeline 9. The ultrasonic bubble counter 4 will count the bubbles generated by the gas entering the water, and the leaked gas enters the measuring cylinder 6 through the ultrasonic bubble counter 4. After the leak detection is completed, the first pneumatic valve RV1 and the third pneumatic valve RV3 are closed, and the measuring cylinder 6 is lifted by the motor 7 to balance the inner and outer pages of the measuring cylinder, and the gas leakage amount can be read; If the lower pressure chamber is pressurized and the upper pressure chamber is tested for leaks, the second pneumatic valve RV2 and the fourth pneumatic valve RV4 are remotely controlled to open, and the residual gas in the upper pressure chamber is emptied through the upper pressure chamber pipeline 1 and the airtightness detection pipeline 9. After the emptying is completed, the fourth pneumatic valve RV4 is closed, and the fifth pneumatic valve RV5 is opened to balance the liquid levels inside and outside the measuring cylinder 6. The fifth pneumatic valve RV5 is closed, and the third pneumatic valve RV3 is opened. The gas leaking from the lower pressure chamber to the upper pressure chamber can enter the ultrasonic bubble counter 4 through the upper pressure chamber pipeline 2 and the airtightness detection pipeline 9. The ultrasonic bubble counter 4 will count the bubbles generated by the gas entering the water, and the leaked gas enters the measuring cylinder 6 through the ultrasonic bubble counter 4. After the leak detection is completed, the second pneumatic valve RV2 and the third pneumatic valve RV3 are closed, and the measuring cylinder 6 is lifted by the motor 7 to balance the liquid levels inside and outside the measuring cylinder, and the gas leakage amount can be read.

[0020] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are protected by the present invention.

Claims

1. A remote controlled airtightness detection system, characterized in that: It includes an upper pressure chamber pipeline (1), a central chamber pipeline (2), a lower pressure chamber pipeline (3), an ultrasonic bubble counter (4), a water tank (5), a measuring cylinder (6), a motor (7), a test wellbore (8), an airtightness detection pipeline (9), a first manual needle valve (R1), a second manual needle valve (R2), a third manual needle valve (R3), a fourth manual needle valve (R4), a fifth manual needle valve (R5), a sixth manual needle valve (R6), a first pneumatic valve (RV1), a second pneumatic valve (RV2), a third pneumatic valve (RV3), a fourth pneumatic valve (RV4), and a fifth pneumatic valve (RV5); The first manual needle valve (R1) is arranged on the upper pressure chamber pipeline (1), and the upper pressure chamber pipeline (1) is remotely controlled by the second pneumatic valve (RV2). The second manual needle valve (R2) and the fifth manual needle valve (R5) are arranged on the central cavity pipeline (2). The third manual needle valve (R3) and the fourth manual needle valve (R4) are arranged on the lower pressure chamber pipeline (3), and the central cavity pipeline (2) and the lower pressure chamber pipeline (3) are remotely controlled by the first pneumatic valve (RV1). The upper pressure chamber pipeline (1), the central cavity pipeline (2), and the lower pressure chamber pipeline (3) are connected to the airtightness detection pipeline (9) and are controlled by the sixth manual needle valve. (R6) is controlled, the ultrasonic bubble counter (4) is arranged on the airtight detection pipeline (9) and is respectively connected to the water tank (5) and the measuring cylinder (6), the third pneumatic valve (RV3) is arranged between the sixth manual needle valve (R6) and the ultrasonic bubble counter (4), the fourth pneumatic valve (RV4) is arranged on the branch circuit between the third pneumatic valve (RV3) and the sixth manual needle valve (R6), the fifth pneumatic valve (RV5) is arranged on the branch circuit between the ultrasonic bubble counter (4) and the measuring cylinder (6), the motor (7) is connected to the measuring cylinder (6), and the motor (7) drives the measuring cylinder (6) to move up and down.

2. The remote control airtightness detection system according to claim 1, characterized in that: The motor (7) drives the measuring cylinder (6) to move up and down through PLC remote control.

3. The remote control airtightness detection system according to claim 1, characterized in that: The first manual needle valve (R1), the second manual needle valve (R2), the third manual needle valve (R3), the fourth manual needle valve (R4), the fifth manual needle valve (R5), and the sixth manual needle valve (R6) are all manually controlled.

4. The remote control airtightness detection system according to claim 1, characterized in that: The first pneumatic valve (RV1), the second pneumatic valve (RV2), the third pneumatic valve (RV3), the fourth pneumatic valve (RV4), and the fifth pneumatic valve (RV5) are all remotely controlled by PLC.

5. A detection method for the remote-controlled airtightness detection system according to claim 1, characterized in that: When conducting a gas test, the first manual needle valve (R1), the second manual needle valve (R2), the third manual needle valve (R3), and the sixth manual needle valve (R6) are in a normally open state, and the water tank (5) and the ultrasonic bubble counter (4) balance the liquid level through the U-shaped tube; when leak detection is performed on the central cavity and the upper pressure cavity, the fourth manual needle valve (R4) is closed and the fifth manual needle valve (R5) is opened; If the upper pressure chamber is pressurized and the central chamber is tested for leaks, the first pneumatic valve (RV1) and the fourth pneumatic valve (RV4) are remotely controlled to open, and the residual gas in the central chamber is emptied through the central chamber pipeline (2) and the airtightness detection pipeline (9). After the evacuation is completed, the fourth pneumatic valve (RV4) is closed, the fifth pneumatic valve (RV5) is opened, and the liquid levels inside and outside the measuring cylinder (6) are balanced. The fifth pneumatic valve (RV5) is closed, and the third pneumatic valve (RV3) is opened. The gas leaking from the upper pressure chamber to the central chamber can enter the ultrasonic bubble counter (4) through the central chamber pipeline (2) and the airtightness detection pipeline (9). The ultrasonic bubble counter (4) counts the bubbles generated by the gas entering the water, and the leaked gas enters the measuring cylinder (6) through the ultrasonic bubble counter (4). After the leak detection is completed, the first pneumatic valve (RV1) and the third pneumatic valve (RV3) are closed, and the measuring cylinder (6) is lifted by the motor (7) to balance the liquid levels inside and outside the measuring cylinder, and the gas leakage amount can be read. If the central cavity is pressurized and the upper pressure cavity is tested for leaks, the second pneumatic valve (RV2) and the fourth pneumatic valve (RV4) are remotely controlled to open, and the residual gas in the upper pressure cavity is emptied through the upper pressure cavity pipeline (1) and the air-tightness detection pipeline (9). After the evacuation is completed, the fourth pneumatic valve (RV4) is closed, the fifth pneumatic valve (RV5) is opened, and the liquid levels inside and outside the measuring cylinder (6) are balanced. The fifth pneumatic valve (RV5) is closed, and the third pneumatic valve (RV3) is opened. Gas leaking from the central cavity to the upper pressure cavity can enter the ultrasonic bubble counter (4) through the upper pressure cavity pipeline (1) and the air-tightness detection pipeline (9). The ultrasonic bubble counter (4) counts the bubbles generated by the gas entering the water, and the leaked gas enters the measuring cylinder (6) through the ultrasonic bubble counter (4). After the leak detection is completed, the second pneumatic valve (RV2) and the third pneumatic valve (RV3) are closed, and the measuring cylinder (6) is lifted by the motor (7) to balance the liquid levels inside and outside the measuring cylinder, and the gas leakage amount can be read.

6. A detection method for the remote-controlled airtightness detection system according to claim 1, characterized in that: The first manual needle valve (R1), the second manual needle valve (R2), the third manual needle valve (R3), and the sixth manual needle valve (R6) are in a normally open state, and the water tank (5) and the ultrasonic bubble counter (4) balance the liquid level through the U-shaped tube; when leak detection is performed on the lower pressure chamber and the upper pressure chamber, the fifth manual needle valve (R5) is closed and the third manual needle valve (R4) is opened; If the upper pressure chamber is pressurized and the lower pressure chamber is tested for leaks, the first pneumatic valve (RV1) and the fourth pneumatic valve (RV4) are remotely controlled to open, and the residual gas in the lower pressure chamber is emptied through the lower pressure chamber pipeline (3) and the air-tightness detection pipeline (9). After the evacuation is completed, the fourth pneumatic valve (RV4) is closed, the fifth pneumatic valve (RV5) is opened, and the liquid levels inside and outside the measuring cylinder (6) are balanced. The fifth pneumatic valve (RV5) is closed, and the third pneumatic valve (RV3) is opened. Gas leaking from the upper pressure chamber to the lower pressure chamber can enter the ultrasonic bubble counter (4) through the lower pressure chamber pipeline (3) and the air-tightness detection pipeline (9). The ultrasonic bubble counter (4) counts the bubbles generated by the gas entering the water, and the leaked gas enters the measuring cylinder (6) through the ultrasonic bubble counter (4). After the leak detection is completed, the first pneumatic valve (RV1) and the third pneumatic valve (RV3) are closed, and the measuring cylinder (6) is lifted by the motor (7) to balance the inner and outer pages of the measuring cylinder, and the gas leakage amount can be read. If the lower pressure chamber is pressurized and the upper pressure chamber is tested for leaks, the second pneumatic valve (RV2) and the fourth pneumatic valve (RV4) are remotely controlled to open, and the residual gas in the upper pressure chamber is emptied through the upper pressure chamber pipeline (1) and the airtightness detection pipeline (9). After the evacuation is completed, the fourth pneumatic valve (RV4) is closed, the fifth pneumatic valve (RV5) is opened, and the liquid levels inside and outside the measuring cylinder (6) are balanced. The fifth pneumatic valve (RV5) is closed, and the third pneumatic valve (RV3) is opened. Gas leaking from the lower pressure chamber to the upper pressure chamber can enter the ultrasonic bubble counter (4) through the upper pressure chamber pipeline (2) and the airtightness detection pipeline (9). The ultrasonic bubble counter (4) counts the bubbles generated by the gas entering the water, and the leaked gas enters the measuring cylinder (6) through the ultrasonic bubble counter (4). After the leak detection is completed, the second pneumatic valve (RV2) and the third pneumatic valve (RV3) are closed, and the measuring cylinder (6) is lifted by the motor (7) to balance the liquid levels inside and outside the measuring cylinder, and the gas leakage amount can be read.

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