Nitrogen charging and detecting device for PVT sampling barrel

Abstract

The utility model discloses a nitrogen charging and checking device for a PVT sampling barrel, and solves the technical problems that the conventional nitrogen charging and checking device is single in function and low in safety coefficient. The device comprises a supporting box, a nitrogen charging mechanism, a fixed protection mechanism and a nitrogen testing mechanism are arranged on the supporting box, and the fixed protection mechanism comprises a fixed protection area arranged on the supporting box and used for placing a PVT sampling barrel; the number of the fixed chain pliers is two, and the two fixed chain pliers are respectively arranged in the fixed protection area and are used for jointly clamping and fixing the PVT sampling barrel; the protection plate is hinged to the supporting box and used for sealing and fixing the opening of the protection area. According to the utility model, nitrogen charging and nitrogen testing operations can be integrated, the functions are diversified, the fixation and shielding protection of the PVT sampling barrel can be realized, the personal safety of workers is ensured, and the potential safety hazard is eliminated.

Description

Technical Field

[0001] The utility model belongs to the technical field of logging devices, and particularly relates to a nitrogen filling and nitrogen testing device for a PVT sampling cylinder. Background Art

[0002] Marine oil and gas resources are abundant. At present, modern science and technology already has great capabilities for their development, and the marine oil and gas industry has developed into a new and high-output leading industry in the marine economy. The PVT sampling cylinder, also called the PVT sampler, is an important part of the logging instrument.

[0003] At present, when using the PVT sampling cylinder, it is necessary to perform nitrogen filling operation on the PVT sampling cylinder and then perform nitrogen testing operation. However, in the related technology, the functions of the nitrogen filling device and the nitrogen testing device of the PVT sampling cylinder are relatively single, and can only perform nitrogen filling operation or nitrogen testing operation separately, which is difficult to meet the on-site requirements.

[0004] Moreover, when the staff performs nitrogen filling operation and nitrogen testing operation through the nitrogen filling device and the nitrogen testing device, due to the lack of fixing and protecting devices for the PVT sampling cylinder, components such as the PVT sampling cylinder and the gas filling pipeline are exposed outside. Once the adapter pipe breaks, it will threaten the personal safety of the staff and there are relatively large potential safety hazards. Summary of the Utility Model

[0005] In order to solve all or part of the above problems, the purpose of the utility model is to provide a nitrogen filling and nitrogen testing device for a PVT sampling cylinder, which can integrate nitrogen filling and nitrogen testing, meet the on-site requirements, and can fix and protect the PVT sampling cylinder, ensure the personal safety of the staff, and eliminate potential safety hazards.

[0006] The utility model provides a nitrogen filling and nitrogen testing device for a PVT sampling cylinder, which includes a support box. A nitrogen filling mechanism, a fixing and protecting mechanism, and a nitrogen testing mechanism are arranged on the support box. The fixing and protecting mechanism is used to fix and protect the PVT sampling cylinder. The nitrogen filling mechanism is used to perform nitrogen filling operation on the PVT sampling cylinder. The nitrogen testing mechanism is used to perform nitrogen testing operation on the PVT sampling cylinder;

[0007] The fixing and protecting mechanism includes:

[0008] A fixing and protecting area is arranged on the support box and is for the PVT sampling cylinder to be placed in;

[0009] Two fixing chain tongs are respectively arranged in the fixing and protecting area. The two fixing chain tongs are used to jointly clamp and fix the PVT sampling cylinder;

[0010] A protection plate is hinged to the support box and is used to cover the opening of the fixing and protecting area.

[0011] Optionally, a guide rail is provided in the fixed protection area, one of the fixed chain clamps is slidably connected to the guide rail, and the distance between the two fixed chain clamps can be adjusted to adapt to PVT sampling tubes of different sizes.

[0012] Optionally, the protective plate is connected to the supporting box via a limiting lock.

[0013] Optionally, a pair of lifting handles are fixedly connected to the protective plate.

[0014] Optionally, the nitrogen charging mechanism comprises:

[0015] A nitrogen cylinder storage area is provided on the back side of the support box and is used for nitrogen cylinders to be placed therein;

[0016] A nitrogen filling pipeline, one end of which is located in the nitrogen bottle storage area and is used to be connected to the nitrogen bottle, and the other end of which is located in the fixed protection area and is used to be connected to the PVT sampling tube;

[0017] A storage area door panel, hinged to the back side of the support box and used to cover the opening of the nitrogen cylinder storage area;

[0018] A first pressure gauge, connected to the gas inlet end of the nitrogen filling pipeline, and used to monitor the pressure of the nitrogen bottle;

[0019] A second pressure gauge, connected to the exhaust end of the nitrogen filling pipeline, and used to monitor the pressure of the PVT sampling tube;

[0020] A third pressure gauge is connected to the pressure relief pipe of the nitrogen filling pipeline and is used to monitor the pressure of the nitrogen filling pipeline;

[0021] A first control valve connected to the nitrogen filling pipeline;

[0022] A second control valve connected to the nitrogen filling pipeline;

[0023] A third control valve connected to the pressure relief pipe of the nitrogen filling pipeline;

[0024] A control panel is arranged on the front side of the support box, and the first pressure gauge, the second pressure gauge, the third pressure gauge, the first control valve, the second control valve and the third control valve are respectively inlaid on the control panel;

[0025] Wherein, the first pressure gauge, the first control valve, the second pressure gauge, and the second control valve are arranged in sequence on the nitrogen filling pipeline.

[0026] Optionally, a clearance opening is provided on the front side of the support box, the clearance opening is aligned with the switch valve of the nitrogen cylinder, and a switch door plate capable of covering the clearance opening is hinged on the support box.

[0027] Optionally, the nitrogen testing mechanism includes:

[0028] A storage area, arranged on the back side of the support box, for placing a pneumatic hydraulic pump, a water storage tank and a sewage tank;

[0029] A nitrogen testing pipeline, one end of which is located in the storage area and used for connecting to the pneumatic hydraulic pump, and the other end is located in the fixed protection area and used for connecting to the PVT sampling cylinder;

[0030] A fourth pressure gauge, connected to the intake pipeline of the pneumatic hydraulic pump, and used for monitoring the intake pressure;

[0031] A fifth pressure gauge, connected to the nitrogen testing pipeline, and used for monitoring the pressure of the PVT sampling cylinder;

[0032] A sixth pressure gauge, connected to the pressure relief pipe of the nitrogen testing pipeline, and used for monitoring the pressure of the nitrogen testing pipeline;

[0033] A fourth control valve, connected to the intake pipeline of the pneumatic hydraulic pump;

[0034] A fifth control valve, connected to the nitrogen testing pipeline;

[0035] A sixth control valve, connected to the pressure relief pipe of the nitrogen testing pipeline;

[0036] An operation tabletop, arranged on the front side of the support box, and the fourth pressure gauge, the fifth pressure gauge, the sixth pressure gauge, the fourth control valve, the fifth control valve and the sixth control valve are respectively inlaid on the operation tabletop.

[0037] Optionally, two closing door panels are hinged to the back side of the support box, and the two closing door panels can jointly cover the opening of the storage area.

[0038] Optionally, self-locking casters are respectively arranged at the four corners of the bottom of the support box.

[0039] As can be seen from the above technical solutions, the PVT sampling cylinder nitrogen filling and nitrogen testing device provided by the present utility model has the following advantages:

[0040] This device can integrate nitrogen filling and nitrogen testing operations, meet on-site requirements, and has more diverse functions. At the same time, this device can fix and protect the PVT sampling cylinder, ensure the personal safety of staff, and eliminate potential safety hazards.

[0041] Other features and advantages of the present utility model will be described in the subsequent description. Description of the Drawings

[0042] The accompanying drawings are used to provide a further understanding of the technical solution of the utility model and constitute a part of the specification. Together with the embodiments of the utility model, they are used to explain the technical solution of the utility model and do not constitute a limitation on the technical solution of the utility model.

[0043] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the utility model;

[0044] Figure 2 It is a schematic diagram of the structure of an embodiment of the utility model, mainly showing the fixed protection mechanism;

[0045] Figure 3 It is a front view of an embodiment of the utility model;

[0046] Figure 4 It is a schematic diagram of the structure of an embodiment of the utility model, mainly showing the back side of the support box;

[0047] Figure 5 This is a schematic diagram of the pipeline of the nitrogen filling pipeline in the embodiment of the utility model;

[0048] Figure 6 This is a schematic diagram of the pipeline of the nitrogen testing pipeline in the embodiment of the utility model.

[0049] Description of reference numerals:

[0050] 1. Support box; 2. Nitrogen charging mechanism; 201. Nitrogen cylinder storage area; 202. Storage area door; 203. Nitrogen charging pipeline; 204. First pressure gauge; 205. Second pressure gauge; 206. Third pressure gauge; 207. First control valve; 208. Second control valve; 209. Third control valve; 230. Control panel; 231. Make way; 232. Switch door; 3. Fixed protection mechanism; 301. Fixed protection area; 30 2. Fixed chain clamp; 303. Protective plate; 304. Guide rail; 305. Limit lock; 306. Lifting handle; 4. Nitrogen test mechanism; 401. Storage area; 402. Closed door panel; 403. Nitrogen test pipeline; 404. Fourth pressure gauge; 405. Fifth pressure gauge; 406. Sixth pressure gauge; 407. Fourth control valve; 408. Fifth control valve; 409. Sixth control valve; 410. Operating table; 5. Self-locking casters. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solution and advantages of the utility model more clear, the embodiments of the utility model will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments and features in the embodiments of the utility model can be combined with each other arbitrarily without conflict.

[0052] like Figure 1 , Figure 2 ,Figure 3 , Figure 4 , Figure 5 , Figure 6 The present embodiment of the utility model is shown. In this embodiment, a nitrogen filling and nitrogen testing device for a PVT sampling cylinder is disclosed, which includes a support box 1 with a hollow interior. A nitrogen filling mechanism 2, a fixed protection mechanism 3, and a nitrogen testing mechanism 4 are sequentially arranged on the support box 1. The fixed protection mechanism 3 is used to fix and protect the PVT sampling cylinder. The nitrogen filling mechanism 2 is used to perform nitrogen filling operations on the PVT sampling cylinder. The nitrogen testing mechanism 4 is used to perform nitrogen testing operations on the PVT sampling cylinder.

[0053] In one embodiment, as shown in Figure 1 , Figure 2 , the fixed protection mechanism 3 includes a fixed protection area 301 arranged on the top of the support box 1. By opening the top of the support box 1, a corresponding position inside the support box 1 forms the fixed protection area 301. Two fixed chain clamps 302 are arranged in the fixed protection area 301, and the two fixed chain clamps 302 are used to jointly clamp and fix the PVT sampling cylinder. At the same time, a protection plate 303 is hinged on the support box 1, and the protection plate 303 can cover the opening of the fixed protection area 301 to realize the shielding protection of components such as the PVT sampling cylinder.

[0054] The PVT sampling cylinder nitrogen filling and nitrogen testing device in this embodiment can integrate nitrogen filling and nitrogen testing operations, meet on-site requirements, and have more diverse functions. At the same time, the device can fix and protect the PVT sampling cylinder, ensure the personal safety of staff, and eliminate potential safety hazards.

[0055] In one embodiment, as shown in Figure 1 , Figure 2 , a guide rail 304 is arranged in the fixed protection area 301. The guide rail 304 is horizontal, and both ends of the guide rail 304 are fixedly connected to the support box 1. One of the fixed chain clamps 302 is slidably connected to the guide rail 304, and the other fixed chain clamp 302 is fixedly connected to the support box 1, so that the distance between the two fixed chain clamps 302 can be adjusted to adapt to PVT sampling cylinders of different sizes.

[0056] In one embodiment, as shown in Figure 1 , Figure 2 , the protection plate 303 is connected to the support box 1 through a limit lock 305 to improve the connection stability between the protection plate 303 and the support box 1, thereby improving the shielding protection effect. At the same time, a pair of lifting handles 306 are fixedly connected to the protection plate 303 to facilitate the staff's lifting operation of the protection plate 303.

[0057] In one embodiment, as shown in Figure 3 , Figure 4As shown, the nitrogen filling mechanism 2 includes a nitrogen cylinder storage area 201 provided on the back side of the support box 1. By opening the back side of the support box 1, a corresponding position inside the support box 1 forms the nitrogen cylinder storage area 201, and the nitrogen cylinder can be placed into the nitrogen cylinder storage area 201. At the same time, a storage area door panel 202 is hinged on the back side of the support box 1, and the storage area door panel 202 is used to cover the opening of the nitrogen cylinder storage area 201 to achieve shielding and protection of the nitrogen cylinder.

[0058] In one embodiment, as Figure 3 、 Figure 4 、 Figure 5 shown, the nitrogen filling mechanism 2 further includes a nitrogen filling pipeline 203. One end of the nitrogen filling pipeline 203 is located inside the nitrogen cylinder storage area 201 and is used to connect to the nitrogen cylinder, and the other end of the nitrogen filling pipeline 203 is located inside the fixed protection area 301 and is used to connect to the PVT sampling cylinder.

[0059] In one embodiment, as Figure 5 shown, a first pressure gauge 204 is connected to the intake end of the nitrogen filling pipeline 203, a second pressure gauge 205 is connected to the exhaust end of the nitrogen filling pipeline 203, and a third pressure gauge 206 is connected to the pressure relief pipe of the nitrogen filling pipeline 203. The first pressure gauge 204 is used to monitor the pressure of the nitrogen cylinder, the second pressure gauge 205 is used to monitor the pressure of the PVT sampling cylinder, and the third pressure gauge 206 is used to monitor the pressure of the nitrogen filling pipeline 203.

[0060] In one embodiment, as Figure 5 shown, a first control valve 207 and a second control valve 208 are connected to the nitrogen filling pipeline 203, and the first pressure gauge 204, the first control valve 207, the second pressure gauge 205, and the second control valve 208 are arranged in sequence on the nitrogen filling pipeline 203. At the same time, a third control valve 209 is connected to the pressure relief pipe of the nitrogen filling pipeline 203.

[0061] In one embodiment, as Figure 3 、 Figure 5 shown, the first control valve 207, the second control valve 208, and the third control valve 209 respectively adopt rotary control valves. A control table 230 is provided on the front side of the support box 1, and the first pressure gauge 204, the second pressure gauge 205, the third pressure gauge 206, the first control valve 207, the second control valve 208, and the third control valve 209 are respectively embedded in the control table 230, so that the staff can quickly control the opening and closing of the corresponding control valves and facilitate the staff to observe the measured values of the pressure gauges.

[0062] In one embodiment, as Figure 3 、 Figure 4As shown in the figure, a relief opening 231 is provided on the front side of the support box 1. After the nitrogen cylinder is placed in the nitrogen cylinder storage area 201, the relief opening 231 is aligned with the switch valve of the nitrogen cylinder, so that the staff can quickly control the opening and closing of the nitrogen cylinder. At the same time, a switch door panel 232 capable of covering the relief opening 231 is hinged on the support box 1 to achieve the shielding protection of the nitrogen cylinder.

[0063] When performing nitrogen filling operation, open the limit lock 305, then pull the lifting handle 306 to drive the protection plate 303 to turn upwards. Then, place the PVT sampling cylinder into the fixed protection area 301 and fix the PVT sampling cylinder through the fixed chain clamp 302. Subsequently, connect the nitrogen filling pipeline 203 to the PVT sampling cylinder, then pull the lifting handle 306 to drive the protection plate 303 to turn downwards, and make the protection plate 303 cover the opening of the fixed protection area 301, and then close the limit lock 305.

[0064] Subsequently, place the nitrogen cylinder into the nitrogen cylinder storage area 201, and connect the nitrogen filling pipeline 203 to the nitrogen cylinder. Confirm that the first control valve 207, the second control valve 208 and the third control valve 209 are respectively in the closed state, and then open the switch valve of the nitrogen cylinder. At this time, nitrogen enters the nitrogen filling pipeline 203, and the measured value of the first pressure gauge 204 is the pressure value of the nitrogen cylinder.

[0065] Immediately afterwards, open the second control valve 208, and nitrogen enters the PVT sampling cylinder through the nitrogen filling pipeline 203. During this process, according to the formation requirements, control the filling pressure of nitrogen at 800 - 1200 Psi. After the PVT sampling cylinder is filled, close the switch valve of the nitrogen cylinder, and then open the third control valve 209 to discharge the nitrogen in the nitrogen filling pipeline 203 through its pressure relief pipe. When the measured values of the first pressure gauge 204, the second pressure gauge 205 and the third pressure gauge 206 are all "0", the protection plate 303 can be opened and the nitrogen filling pipeline 203 can be disassembled, thus completing the nitrogen filling operation.

[0066] In one embodiment, as Figure 3 、 Figure 4 shown, the nitrogen inspection mechanism 4 includes a storage area 401 provided on the back side of the support box 1. By opening the back side of the support box 1, a corresponding position inside the support box 1 forms the storage area 401, and the storage area 401 is for placing the pneumatic hydraulic pump, the water storage tank and the sewage tank. At the same time, two closing door panels 402 are hinged on the back side of the support box 1, and the two closing door panels 402 can jointly cover the opening of the storage area 401 to achieve the shielding protection of components such as the starting hydraulic pump.

[0067] In one embodiment, as Figure 4 、 Figure 6As shown, the nitrogen inspection mechanism 4 further includes a nitrogen inspection pipeline 403. One end of the nitrogen inspection pipeline 403 is located in the placement area 401 and is used to connect to the pneumatic hydraulic pump. The other end of the nitrogen filling pipeline 203 is located in the fixed protection area 301 and is used to connect to the PVT sampling cylinder.

[0068] In one embodiment, as Figure 3 、 Figure 6 shown, a fourth pressure gauge 404 and a fourth control valve 407 are connected to the intake pipeline of the pneumatic hydraulic pump. A fifth pressure gauge 405 and a fifth control valve 408 are connected to the nitrogen inspection pipeline 403. A sixth pressure gauge 406 and a sixth control valve 409 are connected to the pressure relief pipe of the nitrogen inspection pipeline 403. The fourth pressure gauge 404 is used to monitor the intake pressure. The fifth pressure gauge 405 is used to monitor the pressure of the PVT sampling cylinder. The sixth pressure gauge 406 is used to monitor the pressure of the nitrogen inspection pipeline 403.

[0069] In one embodiment, as Figure 3 、 Figure 6 shown, the fourth control valve 407, the fifth control valve 408, and the sixth control valve 409 respectively adopt rotary control valves. An operation table 410 is provided on the front side of the support box 1. The fourth pressure gauge 404, the fifth pressure gauge 405, the sixth pressure gauge 406, the fourth control valve 407, the fifth control valve 408, and the sixth control valve 409 are respectively embedded in the operation table 410, so that the staff can quickly control the opening and closing of the corresponding control valves and facilitate the staff to observe the measured values of the pressure gauges.

[0070] When nitrogen inspection operation is required, connect the nitrogen inspection pipeline 403 to the PVT sampling cylinder, and check whether the seals of the middle piston and the sample valve switch in the PVT sampling cylinder meet the requirements. Then, cover the opening of the fixed protection area 301 with the protection plate 303 and close the limit lock 305.

[0071] Subsequently, place the pneumatic hydraulic pump, the water storage tank, and the sewage tank into the placement area 401. Connect the water inlet end of the pneumatic hydraulic pump to the water storage tank, connect the nitrogen inspection pipeline 403 to the discharge end of the pneumatic hydraulic pump, and at the same time connect the pressure relief pipe of the nitrogen inspection pipeline 403 to the sewage tank.

[0072] Immediately afterwards, turn on the external air source and open the fourth control valve 407 and the fifth control valve 408. The external air source enters the pneumatic hydraulic pump and starts the pneumatic hydraulic pump. At this time, the pneumatic hydraulic pump pumps the clear water in the water storage tank into the PVT sampling cylinder. When the measured value of the fifth pressure gauge 405 remains unchanged, close the fifth control valve 408. At this time, if the measured value of the fifth pressure gauge 405 does not drop, it means that nitrogen filling is successful. If the pressure drops, troubleshoot one by one and perform nitrogen filling operation again.

[0073] Finally, close the fourth control valve 407 and open the sixth control valve 409, so that the clear water in the nitrogen inspection pipeline 403 is discharged into the sewage tank through its pressure relief pipe. When the measured values of the fifth pressure gauge 405 and the sixth pressure gauge 406 are both "0", the protective plate 303 can be opened, and the nitrogen filling pipeline 203 and the PVT sampling cylinder can be disassembled, thus completing the nitrogen inspection operation.

[0074] In one embodiment, as Figure 1 , Figure 2 shown, self-locking casters 5 are respectively arranged at the four corners of the bottom of the support box 1, so as to facilitate the staff to quickly move and transfer the device, improving the operation convenience.

[0075] It can be seen from the above process that the device can realize the integration of nitrogen filling and nitrogen inspection operations, and components such as the PVT sampling cylinder can be shielded and protected, so as to achieve isolation from the staff. If a dangerous situation occurs, personnel can better avoid danger. At the same time, the PVT sampling cylinder can be fixed during the nitrogen filling process, making the nitrogen filling operation safe and reliable, thus ensuring the personal safety of the staff and eliminating potential safety hazards.

[0076] It should be noted that unless otherwise specified, the technical terms or scientific terms used in this utility model should have the ordinary meanings understood by those skilled in the art to which this utility model belongs.

[0077] In addition, terms such as "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. In the description of this utility model, "a plurality of" means more than two, unless otherwise clearly and specifically defined.

[0078] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of this utility model, rather than to limit it; although this utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered by the scope of the claims and the description of this utility model. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. This utility model is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A nitrogen filling and testing device for a PVT sampling tube, comprising a support box (1), characterized in that: The support box (1) is provided with a nitrogen charging mechanism (2), a fixing protection mechanism (3) and a nitrogen testing mechanism (4); the fixing protection mechanism (3) is used to fix and protect the PVT sampling tube; the nitrogen charging mechanism (2) is used to perform nitrogen charging operation on the PVT sampling tube; and the nitrogen testing mechanism (4) is used to perform nitrogen testing operation on the PVT sampling tube; The fixed protection mechanism (3) comprises: A fixed protection area (301) is arranged on the support box (1) and is for the PVT sampling tube to be placed in; Two fixed chain clamps (302) are respectively arranged in the fixed protection area (301), and the two fixed chain clamps (302) are used to clamp and fix the PVT sampling tube together; A protection plate (303) is hinged to the support box (1) and is used to cover the opening of the fixed protection area (301).

2. The nitrogen filling and testing device for a PVT sampling tube according to claim 1 is characterized in that: A guide rail (304) is provided in the fixed protection area (301), one of the fixed chain clamps (302) is slidably connected to the guide rail (304), and the distance between the two fixed chain clamps (302) can be adjusted to fit PVT sampling tubes of different sizes.

3. The nitrogen filling and testing device for a PVT sampling tube according to claim 1 is characterized in that: The protective plate (303) is connected to the supporting box (1) via a limiting lock (305).

4. The nitrogen filling and testing device for a PVT sampling tube according to claim 3 is characterized in that: A pair of lifting handles (306) are fixedly connected to the protective plate (303).

5. The nitrogen filling and testing device for a PVT sampling tube according to claim 1, characterized in that: The nitrogen charging mechanism (2) comprises: A nitrogen bottle storage area (201) is arranged on the back side of the support box (1) and is used to store nitrogen bottles; A nitrogen filling pipeline (203), one end of which is located in the nitrogen bottle storage area (201) and is used to connect to the nitrogen bottle, and the other end of which is located in the fixed protection area (301) and is used to connect to the PVT sampling tube; A storage area door panel (202) is hinged to the back side of the support box (1) and is used to cover the opening of the nitrogen bottle storage area (201); A first pressure gauge (204), connected to the gas inlet end of the nitrogen filling pipeline (203) and used to monitor the pressure of the nitrogen bottle; A second pressure gauge (205), connected to the exhaust end of the nitrogen filling pipeline (203), and used to monitor the pressure of the PVT sampling tube; a third pressure gauge (206), connected to the pressure relief pipe of the nitrogen filling pipeline (203) and used to monitor the pressure of the nitrogen filling pipeline (203); A first control valve (207) connected to the nitrogen filling pipeline (203); A second control valve (208) connected to the nitrogen filling pipeline (203); a third control valve (209) connected to the pressure relief pipe of the nitrogen filling pipeline (203); A control panel (230) is arranged on the front side of the support box (1), and the first pressure gauge (204), the second pressure gauge (205), the third pressure gauge (206), the first control valve (207), the second control valve (208) and the third control valve (209) are respectively embedded on the control panel (230); The first pressure gauge (204), the first control valve (207), the second pressure gauge (205), and the second control valve (208) are arranged in sequence on the nitrogen filling pipeline (203).

6. The nitrogen filling and testing device for a PVT sampling tube according to claim 5, characterized in that: The front side of the support box (1) is provided with a clearance opening (231), the clearance opening (231) is aligned with the switch valve of the nitrogen bottle, and the support box (1) is hinged with a switch door plate (232) capable of covering the clearance opening (231).

7. The nitrogen filling and testing device for a PVT sampling tube according to claim 1, characterized in that: The nitrogen testing mechanism (4) comprises: A storage area (401) is arranged on the back side of the support box (1) and is used to place a pneumatic hydraulic pump, a water tank and a sewage tank; A nitrogen testing pipeline (403), one end of which is located in the storage area (401) and is used to connect to the pneumatic hydraulic pump, and the other end of which is located in the fixed protection area (301) and is used to connect to the PVT sampling tube; a fourth pressure gauge (404), connected to the air intake line of the pneumatic hydraulic pump and used to monitor the air intake pressure; A fifth pressure gauge (405), connected to the nitrogen testing pipeline (403) and used to monitor the pressure of the PVT sampling tube; a sixth pressure gauge (406), connected to the pressure relief pipe of the nitrogen testing pipeline (403) and used to monitor the pressure of the nitrogen testing pipeline (403); a fourth control valve (407) connected to an air inlet line of the pneumatic hydraulic pump; a fifth control valve (408), connected to the nitrogen testing pipeline (403); a sixth control valve (409), connected to the pressure relief pipe of the nitrogen testing pipeline (403); An operating table (410) is arranged on the front side of the support box (1), and the fourth pressure gauge (404), the fifth pressure gauge (405), the sixth pressure gauge (406), the fourth control valve (407), the fifth control valve (408) and the sixth control valve (409) are respectively embedded on the operating table (410).

8. The nitrogen filling and testing device for a PVT sampling tube according to claim 7, characterized in that: Two closed door panels (402) are hinged on the back side of the support box (1), and the two closed door panels (402) can jointly cover the opening of the storage area (401).

9. The nitrogen filling and testing device for a PVT sampling tube according to any one of claims 1 to 8, characterized in that: Self-locking casters (5) are respectively arranged at the four corners of the bottom of the support box (1).

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