Light rod sealer inspection device and method thereof

Abstract

The application provides a polished rod seal device inspection device and method thereof, which comprises a rotating power system, a polished rod seal detection system, a bias adjustment detection system, a pressure test detection system, a gas pressure system and a circulation system. The rotating power system provides tension, stroke and stroke frequency for the polished rod seal detection system. The polished rod seal detection system provides a bias adjustment angle and a bias adjustment distance for the bias adjustment detection system, and provides a pressure test polished rod seal device and a platform for the pressure test detection system. The pressure test detection system provides well fluid, temperature, pressure and time for the polished rod seal detection system. The gas pressure system provides gas pressure and pressure test gas for the pressure test detection system, and the pressure test well fluid in the polished rod seal detection system is cleaned and enters the circulation system. The polished rod seal device inspection device and method thereof improve the reliability, safety and service life of the polished rod seal device, and the test inspection is convenient and fast, the test cost is low, the labor intensity of the oil production workers can be reduced, and green production of the well site can be maintained.

Description

Technical Field

[0001] This invention relates to the field of polished rod seal inspection technology in oil wells, and in particular to a polished rod seal inspection device and method. Background Technology

[0002] Polished rod seals are crucial components for sealing the wellhead on the production tree of oil pumping units. With numerous models and specifications, and operating in a wide area with many points of contact, their safety and reliability are paramount. Leakage can cause contamination of the wellhead and well site, and even accidents involving the pumping unit and wellhead machinery. As the number of oil wells and the workload increase, the demand for polished rod seals also increases, leading to ever-higher requirements for their safety and reliability. Domestic and international oilfield companies conduct performance tests and inspections before and after purchasing products, ensuring they meet their company's product procurement standards before use.

[0003] Currently, domestic oil production companies are increasingly emphasizing product quality, but their testing equipment and methods are still imperfect. Testing and inspection methods are simplistic, and the inspection indicators are incomplete, failing to meet the technical requirements of enterprise product procurement standards. Due to the lack of comprehensive testing equipment and methods, manufacturers and purchasing units primarily rely on two methods to verify product performance under different conditions: one is to install the manufactured polished rod seals on oil wells in the field to verify their compliance with all required technical parameters; the other is to test their sealing performance through hydrostatic pressure testing. However, due to the limited testing items and the specific characteristics of oil wells, laboratory hydrostatic pressure testing cannot meet the technical requirements for dynamic sealing of polished rod seals on oil wells, nor can it determine the service life of the polished rod seals. Packing is only replaced after polished rod seal failure is discovered in field applications.

[0004] The varying reservoir properties, crude oil properties, well type, water cut salinity, polished rod wear and corrosion, pumping speed (stroke, stroke rate), wellhead back pressure, and surface equipment conditions in each oilfield necessitate different requirements for the model and specifications of polished rod seals. Even the same model and specifications will exhibit different performance and lifespan under these varying conditions. On-site testing at production wells is limited to testing the performance under specific conditions for each type of well, resulting in inconsistent results and incurring long testing cycles and high costs. Therefore, the actual effectiveness of manufactured products in oilfields is highly unpredictable, posing significant safety and environmental risks in oilfield production. Consequently, designing a comprehensive testing and inspection device and method is a crucial requirement.

[0005] Publication No.: CN110657980A, relates to a testing system for the sealing performance of packing at the wellhead of an oil well, belonging to the field of sealing device testing technology. It includes a simulated wellbore, packing boxes, a sucker rod, a drive mechanism, a transmission mechanism, an oil supply system for supplying experimental oil to the simulated wellbore, and a cooling medium supply system for supplying cooling medium to the sucker rod. Packing boxes are installed at both ends of the simulated wellbore, and the sucker rod passes axially through the simulated wellbore. The transmission mechanism converts the rotational motion of the drive mechanism into the linear reciprocating motion of the sucker rod. A cooling channel is provided inside the sucker rod. This invention can simulate the working condition of the rubber tower-shaped packing seal during the reciprocating motion of the sucker rod at the wellhead of an oil well, allowing rubber tower-shaped packing manufacturers to test and verify the use of packing under various working conditions in their own production plants. The testing is more convenient and faster, reducing testing costs, while ensuring that the rubber tower-shaped packing supplied to oilfield production units is efficient and durable.

[0006] Publication No.: CN208420283U, This utility model relates to the field of oilfield machinery technology and is an electric testing device for a polished rod seal. It includes a drive screw, a drive polished rod, a support ring platform, and a mounting ring platform. The support ring platform is located on the outer side of the middle of the drive screw, and a transmission component is provided on the support ring platform to enable the drive screw to reciprocate up and down. The lower end of the drive screw and the upper end of the drive polished rod are fixedly mounted together by a fixing device. The mounting ring platform is fitted onto the outer side of the middle of the drive polished rod, and an anti-rotation component is provided on the outer side of the drive screw corresponding to the position between the support ring platform and the mounting ring platform. This utility model has a reasonable and compact structure and is easy to use. It simulates the sucker rod suction operation through the interaction of the drive motor, reducer, and drive polished rod, realizing the sealing test and service life test of the polished rod seal, and has the characteristics of being fast, efficient, and accurate.

[0007] Publication No.: CN212180240U A static and dynamic simulation test device for a polished rod seal is disclosed. This device includes an upper support plate, a lower support plate, a simulated polished rod, and a polished rod seal. A cylinder is mounted on the surface of the upper support plate. The lower end of the simulated polished rod is inserted into the conical packing rubber seal on the polished rod seal. A cap on the simulated polished rod is screwed onto the piston rod of the cylinder. A pressure iron is provided at the lower end of the polished rod seal. A reversing valve stop is installed near the upper support plate at the upper end of the simulated polished rod via a connecting nut. A first support plate is installed at one end of the reversing valve stop. Limit switches are provided at both the upper and lower ends of the first support plate. This invention has a simple structure and is mainly used in factories for testing and verifying the static and dynamic sealing performance and the service life of the conical packing rubber seal during the research and development and manufacturing of polished rod seals. It provides direct data for research, design, and manufacturing, thereby improving the reliability, safety, and service life of the polished rod seal.

[0008] The above-mentioned existing technologies are all quite different from the present invention and have failed to solve the technical problem we want to solve. Therefore, we have invented a new inspection device and method for smooth rod seals. Summary of the Invention

[0009] The purpose of this invention is to provide a device and method for testing the sealing performance of various models and specifications of polished rod seals under different parameters, different pressure and temperature ratios of crude oil, raw water and raw gas, and different physical properties of crude oil.

[0010] The objective of this invention can be achieved through the following technical measures: a polished rod seal inspection device, comprising a rotary power system, a polished rod seal detection system, an alignment detection system, a pressure testing system, a pneumatic system, and a circulation system. The rotary power system is connected to the polished rod seal detection system, providing tension, stroke, and stroke rate for the connection. The polished rod seal detection system is connected to the alignment detection system and the pressure testing system, providing the alignment detection system with the alignment angle and alignment distance, and providing the pressure testing system with a pressure-testing polished rod seal and platform. The pressure testing system is connected to the pneumatic system and the circulation system, providing the polished rod seal detection system with the testing well fluid, temperature, pressure, and time. The pneumatic system provides the pressure and testing gas to the pressure testing system, and the testing well fluid in the polished rod seal detection system is purged and enters the circulation system.

[0011] The objective of this invention can also be achieved through the following technical measures:

[0012] The rotary power system includes a frequency converter cabinet, a speed control unit, a motor, a turntable, a speed measurement platform, a rotating handle, a wire rope, a fixed pulley, and a suspension device. The frequency converter cabinet is connected to the motor, providing power and adjusting the speed. The rotating handle and the turntable are mounted on the motor shaft. The speed measurement platform is installed between the frequency converter cabinet, the speed control unit, and the fixed pulley, measuring the speed signal of the turntable and transmitting it to the speed control unit for display, thus adjusting the stroke and stroke rate. The wire rope is connected to the rotating handle, the fixed pulley, and the suspension device, and pulls the optical rod of the optical rod sealing detection system to reciprocate through the fixed pulley and the suspension device.

[0013] The rotary power system also includes multiple stroke holes and a rotating pin. The rotating handle is provided with the multiple stroke holes, and the rotating pin is connected to the rotating handle bearing through the stroke hole. The rotating pin is fixed in the stroke hole and connected to the bearing for free rotation. The rotating pin pulls the wire rope to make a circular reciprocating motion as the rotating handle rotates. The wire rope pulls the guide rod to make a reciprocating motion through the fixed pulley and the suspension device. By adjusting the stroke hole where the rotating pin is located on the rotating handle, the reciprocating distance of the guide rod is different, and the distance is the stroke.

[0014] The speed measurement platform includes a speed sensor, a connecting rod, a bracket, and a floor. The floor is used to fix the motor, the bracket is fixed to the floor, one end of the connecting rod is fixed to the speed sensor, and the other end is fixed to the bracket. The speed sensor measures the rotation speed signal of the turntable and transmits the rotation speed signal to the speed control unit.

[0015] The suspension device is installed between the offset distance frame of the smooth rod sealing detection system and the fixed pulley, and serves to connect the smooth rod and the wire rope.

[0016] The suspension device includes a suspension body, a plumb bob, a suspension connector, a smooth rod connector, and a pressure plate screw hole. The suspension body is connected to the steel wire rope through the plumb bob. The suspension connector is threaded to the smooth rod through the smooth rod connector. The pressure plate is fixed to the suspension body by screws into the pressure plate screw hole, thus fixing the steel wire rope and serving to connect the smooth rod and the steel wire rope.

[0017] The smooth rod sealing testing system includes a smooth rod and, in sequence, an adjustment distance frame, an A-type smooth rod seal, a four-way valve, a C-type smooth rod seal, an adjustment angle frame, a fixed baffle, a spring, and a smooth rod coupling. The adjustment distance frame and the adjustment angle frame provide adjustment displacement and support force for the smooth rod. The smooth rod reciprocates within the A-type smooth rod seal, the four-way valve, and the C-type smooth rod seal to test the wear-resistant sealing performance of the packing inside. The spring passes through the smooth rod to provide tension, the fixed baffle acts to block the spring, and the smooth rod coupling fixes the spring.

[0018] The fixing baffle includes screws, an upper plate, a guide rod hole, a lower plate, a steel plate, a reinforcing rib, and a base. The upper plate is connected and fixed to the lower plate by the screws. The lower plate is welded to the steel plate and the reinforcing rib. The steel plate and the reinforcing rib are welded to the base. The base is fixed to the floor. The guide rod passes through the guide rod hole. The fixing baffle flattens and fixes the guide rod and blocks the spring.

[0019] The offset adjustment bracket includes a fixed ring, packing, a guide rod hole, an upper hinge seat, a lead screw, an upper support rod, a double hinge seat, a lower support rod, a lower hinge seat, and a base. The fixed ring is welded to the upper hinge seat, and the packing and the guide rod hole are installed inside the fixed ring. The upper hinge seat is shaft-connected to the upper support rod, and the double hinge seat is shaft-connected to the upper and lower support rods. The lower support rod is shaft-connected to the lower hinge seat, and the lower hinge seat is welded and fixed to the base. A handwheel is fixed to one end of the lead screw. Rotating the handwheel clockwise raises the fixed ring, and rotating the handwheel counterclockwise lowers the fixed ring. The guide rod passes through the guide rod hole and moves up and down accordingly, thus adjusting the offset angle and offset distance of the C-type guide rod seal and the A-type guide rod seal.

[0020] The Type A smooth rod seal includes a gland, gland, packing, secondary packing, packing tube, sealing ring, sealer spring, adjusting connector, adjusting cap, sealing ring, and clamp head. The gland is threaded to the packing tube and contains the gland and packing. Tightening the gland compresses the packing, sealing the smooth rod. The adjusting connector is threaded to the packing tube and contains the secondary packing, sealing ring, and sealer spring. Tightening the packing tube compresses the secondary packing, sealing ring, and sealer spring, sealing the smooth rod. The adjusting connector connects to the sealing ring and clamp head via the adjusting cap, serving both sealing and adjusting functions. The smooth rod passes through the packing and secondary packing, and hydraulic static and dynamic sealing performance tests are conducted.

[0021] The polished rod sealing test system also includes a type B polished rod seal and a tee. The type B polished rod seal is installed on the tee and connected by a clamp. A test mandrel of the smallest applicable polished rod specification is installed in the polished rod seal and the packing is pressed to perform a hydraulic static sealing performance test.

[0022] The Type B smooth rod seal includes a gland, a pressure cap, a packing housing, packing, a washer, a sealing cap, a lead screw, a rubber seat, a rubber, and a clamp seat. The pressure cap is threaded to the packing housing and contains the gland, packing, and washer. A test mandrel of the smallest specification applicable to the smooth rod is installed, passing through the pressure cap, gland, and packing and inserted into the tee. Tightening the pressure cap compresses the gland and packing, thus sealing the mandrel, i.e., primary sealing. The sealing cap is threaded to the packing housing and contains the lead screw, rubber seat, and rubber. Tightening the lead screw compresses the rubber, thus sealing the mandrel, i.e., secondary sealing. The clamp seat is an integral structure with the packing housing. Below the rubber, the clamp seat is connected to the tee via the clamp seat.

[0023] The four-way connector includes a right clamp head, a retaining clamp, a four-way clamp head, a left clamp head, a fixed base plate, a bracket, and a base. The retaining clamp is bolted to the fixed base plate to hold and fix the four-way connector. The fixed base plate is welded to the bracket, and the bracket is welded to the base. The right clamp head of the four-way connector is clamped to the clamp head of the A-type smooth rod seal. The front of the four-way clamp head is connected to the clamp of the high-pressure hydraulic control valve and the pressure test pipe of the pressure testing system, and the rear is connected to the clamp of the circulation valve of the circulation system. The left clamp head is clamped to the clamp seat of the C-type smooth rod seal.

[0024] Two of the four-way valves are installed between the type A smooth rod seal and the type C smooth rod seal, and the other two are installed between the three-way valve and the high-pressure hydraulic control valve, connected by clamps.

[0025] The C-type polished rod seal includes a scraper packing, a gland, a pressure cap, a packing cylinder, a packing, a stop, a rubber block seat, a set screw cap, a set screw, a rubber block, a ball head, a sealing ring, a ball head cap, a pressure cap, an adjusting disc, and a clamp seat. The pressure cap is threadedly connected to the packing cylinder and contains the scraper packing and the gland. The scraper packing presses against the gland, and the gland presses against the packing. The packing is located inside the packing cylinder and presses against the stop. When the pressure cap is tightened, the axial compression of the packing seals the polished rod, i.e., it provides a primary seal. The set screw cap is threadedly connected to the packing cylinder and contains... The device includes a set screw, a rubber block seat, and a rubber block. Tightening the set screw causes the rubber block to compress radially, thus sealing the polished rod (i.e., a secondary seal). The ball head is integrated with the packing cylinder and is threadedly connected to the adjusting disc via a ball head cap. The ball head presses against the sealing ring for sealing, and the ball head rotates under stress, thus self-aligning. The adjusting disc is threadedly connected to the clamp seat via a pressure cap. The pressure cap presses against the adjusting disc for sealing, and the adjusting disc adjusts under stress. The polished rod passes through the inner packing and the rubber block, allowing for hydraulic static and dynamic sealing performance tests.

[0026] The angle adjustment frame includes a fixed ring, packing, a guide rod hole, an upper hinge seat, a lead screw, an upper support rod, a double hinge seat, a handwheel, a lower support rod, a lower hinge seat, and a base. The fixed ring is welded to the upper hinge seat, and the fixed ring contains the packing and the guide rod hole. The upper hinge seat is shaft-connected to the upper support rod, and the double hinge seat is shaft-connected to the upper and lower support rods. The lower support rod is shaft-connected to the lower hinge seat, and the lower hinge seat is welded and fixed to the base. The handwheel is fixed to one end of the lead screw. Rotating the handwheel clockwise raises the fixed ring, and rotating the handwheel counterclockwise lowers the fixed ring. The guide rod passes through the guide rod hole and moves up and down accordingly, thus adjusting the angle and distance of the C-type guide rod seal and the A-type guide rod seal. The guide rod passes through the guide rod hole, which serves to fix and adjust the guide rod.

[0027] The misalignment detection system includes a displacement sensor, an angle sensor, and a misalignment display screen. The displacement sensor is installed on the A-type smooth rod seal to detect its misalignment distance, and the angle sensor is installed on the C-type smooth rod seal to detect its misalignment angle. The misalignment display screen is connected to the displacement sensor and the angle sensor respectively to display the misalignment distance and the misalignment angle.

[0028] The pressure testing system includes a well fluid tank, a supply valve, a heater, an inlet valve, a hydraulic station, a hydrostatic testing platform, an electric heating control box, a pressure testing monitoring and operation platform, an outlet pipe, an outlet valve, a test pipe, and a high-pressure hydraulic control valve. The well fluid tank is connected to the heater via the supply valve. The electric heating control box provides power to the heater and regulates the temperature of the heated well fluid. The heater is connected to the inlet valve, which is connected to the hydrostatic testing platform. The heated well fluid enters the hydrostatic testing platform through the inlet valve. The pressure testing monitoring and operation platform is connected to the hydrostatic testing platform via a cable. The system provides electrical power and regulates pressure. After the pressure is regulated by the pressure testing and monitoring platform, the well fluid enters the polished rod seal detection system through the outlet pipe, outlet valve, pressure testing pipe, and high-pressure hydraulic control valve. The high-pressure hydraulic control valve is connected to the four-way valve of the polished rod seal detection system. The pressure testing and monitoring platform controls the opening and closing of the high-pressure hydraulic control valve to provide different pressure stabilization times for the polished rod seal detection system. The hydraulic station is connected to the pressure testing and monitoring platform and is connected to the high-pressure hydraulic control valve through the hydraulic pipeline. The pressure testing and monitoring platform regulates the opening and closing of the high-pressure hydraulic control valve by the hydraulic station.

[0029] The pneumatic system includes a pneumatic control valve, a pressurizing air pipe, an air compressor, an air supply valve, and an air compressor control box. The air compressor control box provides power to the air compressor via a cable. The pneumatic control valve is connected to the hydrostatic test platform of the pressure testing system to regulate the air pressure of the hydrostatic test platform. The air compressor is connected to the pressurizing air pipe and provides air pressure to the smooth rod seal testing system through the switching of the pneumatic control valve.

[0030] The objective of this invention can also be achieved through the following technical measures: a method for inspecting the eccentricity angle and adjustment distance of a polished rod seal, wherein the method employs a polished rod seal inspection device, comprising:

[0031] When inspecting the adjustment distance parameter of the Type A smooth rod seal, loosen the adjustment cap of the Type A smooth rod seal, use the adjustment distance to lift or lower the height of the smooth rod, the smooth rod pulls the adjustment joint to cause displacement, the displacement distance is transmitted to the adjustment display screen through the displacement sensor, and the adjustment distance index of the Type A smooth rod seal 15 is measured.

[0032] When inspecting the adjustment angle parameter of the C-type smooth rod seal, loosen the ball head cover of the C-type smooth rod seal, use the adjustment angle bracket to lift or lower the height of the smooth rod, the smooth rod pulls the ball head to tilt, the adjustment angle is transmitted to the adjustment display screen through the angle sensor, and the acute angle value of the C-type smooth rod seal is displayed. 90 minus the difference of the acute angle value multiplied by 2 is the adjustment angle index.

[0033] The objective of this invention can also be achieved through the following technical measures:

[0034] The inspection method for the eccentric angle and adjustment distance of the polished rod seal also includes adjusting the steel wire rope, the adjustment distance frame, the polished rod, the A-type polished rod seal, the four-way valve, the C-type polished rod seal, the adjustment angle frame, and the fixed baffle to align the eight points with the line after inspection and recording. Then, the adjustment cap of the A-type polished rod seal and the ball head cap of the C-type polished rod seal are tightened respectively.

[0035] The objective of this invention can also be achieved through the following technical measures: a method for testing the hydraulic dynamic and static sealing performance of a polished rod seal, wherein the method employs a polished rod seal testing device, comprising:

[0036] Different pressures are set on the pressure testing monitoring and operation platform, and different heating temperatures are set on the electric heating control box. At the same time, the air compressor control box starts the air compressor to supply air to the water pressure test platform through the air supply valve, and controls the various air pressure valves inside to adjust the outlet pressure of the water pressure test platform.

[0037] Well fluid enters the hydrostatic test platform through an electric heating control box with different heating temperatures set. The hydrostatic test platform pressurizes the well fluid according to different pressures set. The fluid then enters the four-way valve through the outlet pipe, outlet valve, test pipe, and high-pressure hydraulic control valve. Well fluids at different temperatures and pressures enter the A-type polished rod seal, B-type polished rod seal, three-way valve, and C-type polished rod seal, respectively.

[0038] When performing a static sealing test, the smooth rod remains stationary. Gradually increase the pressure to 1.5 times the rated working pressure and stabilize the pressure for 3 minutes. There should be no leakage or permanent deformation. This is the static sealing test for the type B smooth rod seal.

[0039] When performing dynamic sealing tests, start and adjust the frequency converter cabinet to generate reciprocating motion of the polished rod. Perform dynamic sealing tests on the A-type polished rod seal and the C-type polished rod seal under different strokes, pressures, temperatures, and well fluids. Gradually increase the pressure to 1.2 times the rated working pressure and maintain it at a stroke rate of 6 times / minute for 15 minutes. There should be no leakage or permanent deformation.

[0040] The objective of this invention can also be achieved through the following technical measures: a method for testing the airtightness of a polished rod seal, which employs a polished rod seal testing device, comprising:

[0041] The pneumatic system, consisting of a pneumatic control valve, a pressurizing air pipe, an air compressor, an air supply valve, and an air compressor control box, is used for air tightness testing and supplying air to the hydraulic test platform. When the test system is stopped, the pneumatic system is started through the air compressor control box. The air compressor introduces air into the test platform system through the pressurizing air pipe and the high-pressure hydraulic control valve to test the air tightness of the Type A, Type B, and Type C smooth rod seals.

[0042] After the hydraulic dynamic and static sealing of the polished rod sealer is tested, close the liquid outlet valve, open the high-pressure hydraulic control valve, close the air supply valve, open the air control valve and the circulation valve, start the air compressor through the air compressor control box, and the air compressor pumps air to the four-way valve and circulation pipeline through the pressurization pipe and the high-pressure hydraulic control valve to clean the line. After cleaning, close the valve of the well fluid tank and the circulation valve.

[0043] For static airtightness testing, gradually increase the pressure to 1.5 times the rated working pressure and stabilize the pressure for 3 minutes. There should be no leakage or permanent deformation. For dynamic airtightness testing, gradually increase the pressure to 1.2 times the rated working pressure and maintain the pressure at 6 times / minute for 15 minutes. There should be no leakage or permanent deformation.

[0044] This invention addresses the problems of poor sealing performance and short service life of polished rod seals currently used in oil wells due to a lack of inspection. The purpose of this invention is to provide a comprehensive inspection device and method for polished rod seals. Compared with existing technologies, the advantages of this invention are:

[0045] This invention features a simple structure and is primarily used for testing and verifying the static and dynamic sealing performance of polished rod seals, as well as the service life of packing rubber seals. It is also used to test the rated working pressure of the polished rod seal body and its connecting parts; to test and verify the airtightness of the polished rod seal; and to test the adjustment angle, adjustment distance, and other indicators of various polished rod seal models and specifications. This provides direct data for research, design, and manufacturing, thereby improving the reliability, safety, and service life of polished rod seals. Manufacturers can complete the testing and verification of polished rod seals under different working conditions indoors, making testing convenient, quick, and inexpensive. Simultaneously, oilfield production units can conduct incoming inspections to ensure the safety and durability of polished rod seals, reducing the labor intensity of oilfield workers and maintaining green production at well sites. Attached Figure Description

[0046] Figure 1 This is a structural diagram of a specific embodiment of the optical rod seal inspection device of the present invention;

[0047] Figure 2 This is a schematic diagram of the structure of the fixed baffle in a specific embodiment of the present invention;

[0048] Figure 3 This is a schematic diagram of the rotational speed measurement platform in a specific embodiment of the present invention;

[0049] Figure 4 This is a schematic diagram of the structure of the hanger in a specific embodiment of the present invention;

[0050] Figure 5 This is a schematic diagram of the structure of the offset distance adjustment frame in a specific embodiment of the present invention;

[0051] Figure 6 This is a schematic diagram of the structure of the Type A smooth rod seal in a specific embodiment of the present invention;

[0052] Figure 7 This is a schematic diagram of the four-way valve structure in a specific embodiment of the present invention;

[0053] Figure 8 This is a schematic diagram of the B-type smooth rod seal in a specific embodiment of the present invention;

[0054] Figure 9 This is a schematic diagram of the C-type smooth rod seal in a specific embodiment of the present invention;

[0055] Figure 10 This is a schematic diagram of the structure of the angle adjustment frame in a specific embodiment of the present invention. Detailed Implementation

[0056] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0057] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments of the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, and / or combinations thereof.

[0058] The polished rod seal inspection device of the present invention comprises six systems: a rotary power system, a polished rod seal detection system, an alignment detection system, a pressure testing system, a pneumatic system, and a circulation system. The rotary power system is connected to the polished rod seal detection system, providing tension, stroke, and number of strokes. The polished rod seal detection system is connected to the alignment detection system and the pressure testing system, providing the alignment angle and distance for the alignment detection system, and providing the pressure testing polished rod seal and platform for the pressure testing system. The pressure testing system is connected to the polished rod seal detection system, the pneumatic system, and the circulation system, providing the well fluid, temperature, pressure, and time for inspection of the polished rod seal detection system. The pneumatic system provides the pressure and testing gas to the pressure testing system, and the testing well fluid within the polished rod seal detection system is purged and enters the circulation system.

[0059] like Figure 1 As shown, Figure 1This is a structural diagram of the polished rod seal inspection device of the present invention. The polished rod seal inspection device includes a frequency converter cabinet 1, a speed control unit 2, a motor 3, a motor shaft 4, a turntable 5, a speed measuring platform 6, a stroke hole 7, a rotating pin 8, a rotating handle 9, a wire rope 10, a fixed pulley 11, a suspension device 12, an adjustment distance frame 13, a polished rod 14, a type A polished rod seal 15, a displacement sensor 16, a four-way valve 17, a type B polished rod seal 18, a three-way valve 19, a circulation valve 20, an angle sensor 21, a type C polished rod seal 22, and an adjustment angle frame. Composed of: 23. Fixed baffle; 24. Spring; 25. Polished rod coupling; 26. Circulation pipeline; 27. Well fluid tank; 28. Liquid supply valve; 29. ​​Heater; 30. Liquid inlet valve; 31. Hydraulic station; 32. Water pressure test platform; 33. Electric heating control box; 34. Pressure test monitoring and operation platform; 35. Liquid outlet pipe; 36. Liquid outlet valve; 37. Pressure test pipe; 38. High-pressure hydraulic control valve; 39. Pneumatic control valve; 40. Pressurization air pipe; 41. Air compressor; 42. Air supply valve; 43. Air compressor control box; 44. Deviation display screen; etc.

[0060] The rotary power system is composed of Figure 1 The system consists of a frequency converter cabinet 1, a speed control unit 2, a motor 3, a motor shaft 4, a turntable 5, a speed measuring platform 6, a stroke hole 7, a rotating pin 8, a rotating handle 9, a wire rope 10, a fixed pulley 11, and a suspension device 12. The frequency converter cabinet 1 provides power to the motor 3 and adjusts its speed via cables. The speed control unit 2 receives the speed signal from the speed measuring platform 6 via wires, providing a basis for setting the stroke of the guide rod. Adjusting the stroke hole 7, where the rotating pin 8 is located on the rotating handle 9, provides a basis for setting the stroke of the guide rod.

[0061] Structural diagram of the present invention Figure 3 The speed measurement platform 6 is installed between the frequency converter cabinet 1, the speed control unit 2, and the fixed pulley 11, and serves to adjust the stroke rate and stroke. The speed measurement platform 6 includes a speed sensor 6-1, a sensor cable 6-2, a connecting rod 6-3, a bracket 6-4, and a floor 6-5.

[0062] The motor 3 is fixed to the floor 6-5. The frequency converter cabinet 1 supplies power to control its speed. A rotating handle 9 and a turntable 5 are installed on the motor shaft 4. The rotation of the turntable 5 senses the speed sensor 6-1. The sensed signal is transmitted to the speed control unit 2 through the sensor line 6-2 to display the speed.

[0063] The connecting rod 6-3 has a speed sensor 6-1 fixed at one end and a bracket 6-4 fixed at the other end. The bracket 6-4 is fixed to the floor 6-5.

[0064] The rotating handle 9 is provided with a stroke hole 7. The rotating pin 8 is connected to the bearing of the rotating handle 9 through the stroke hole 7. The rotating pin 8 is fixed in the stroke hole 7 and the bearing is connected to rotate freely. Its rotation pulls the wire rope 10 to make a circular reciprocating motion. The wire rope 10 pulls the light rod 14 to make a reciprocating motion through the fixed pulley 11 and the suspension device 12.

[0065] By adjusting the frequency of the inverter cabinet 1, the motor 3 rotates at different speeds. The speed is detected by the speed measurement platform 6 and displayed on the tachometer of the speed control unit 2. The number of revolutions per minute of the rotating handle 9 is calculated, i.e., the number of strokes. Adjusting the rotating pin 8 at different stroke holes 7 on the rotating handle 9 results in different reciprocating distances of the guide rod; this distance represents the stroke.

[0066] Structural diagram of the present invention Figure 4 The suspension device 12 is installed between the offset adjustment frame 13 and the fixed pulley 11, and serves to connect the smooth rod 14 and the wire rope 10.

[0067] like Figure 4 As shown, the suspension device 12 includes: a suspension body 12-1, a plumb bob 12-2, a suspension connector 12-3, a smooth rod connector 12-4, and a pressure plate screw hole 12-5. The suspension body 12-1 is connected to the wire rope 10 via the plumb bob 12-2. The suspension connector 12-3 is connected to the smooth rod 14 via the smooth rod connector 12-4. The pressure plate is fixed to the suspension body 12-1 by screws into the pressure plate screw hole 12-5, thus fixing the wire rope 10 and connecting the smooth rod 14 and the wire rope 10.

[0068] The bare rod seal detection system is composed of Figure 1 The system consists of an adjustment distance bracket 13, a polished rod 14, an A-type polished rod seal 15, a four-way connector 17, a B-type polished rod seal 18, a three-way connector 19, a C-type polished rod seal 22, an adjustment angle bracket 23, a fixing baffle 24, a spring 25, and a polished rod coupling 26. The adjustment distance bracket 13 and the adjustment angle bracket 23 provide adjustment displacement and support force for the polished rod 14. The polished rod 14 reciprocates within the A-type polished rod seal 15, the four-way connector 17, and the C-type polished rod seal 22 to test the wear-resistant sealing performance of the packing. The spring 25 is threaded through the polished rod 14, providing it with tension.

[0069] Installation method of bare rod 14: Apply grease to the surface of bare rod 14, tighten bare rod coupling 26, and horizontally connect bare rod joint 12-4 to spring 25, pass through fixed baffle 24 and its bare rod hole 24-3, tilt angle bracket 23, type A bare rod seal 15, four-way connector 17, type C bare rod seal 22, and tilt distance bracket 13 in sequence. The bare rod joint 12-4 and the suspension joint 12-3 of the hanger 12 are securely threaded together to complete the bare rod installation.

[0070] The structure of the fixed baffle 24 is as follows: Figure 2As shown, it consists of screw 24-1, upper plate 24-2, smooth rod hole 24-3, lower plate 24-4, steel plate 24-5, plate rib 24-6, base 24-7, etc. A spring 25, threaded onto the smooth rod 14, is installed between the smooth rod coupling 26 and the fixed baffle 24, as well as its upper plate 24-2 and lower plate 24-4. The fixed baffle 24 serves to block the spring 25. The spring 25 exerts a pushing and pulling action with the reciprocating motion of the smooth rod 14.

[0071] Structural diagram of the present invention Figure 5 The offset adjustment bracket 13 is installed between the type A guide rod seal and the hanger 12. The guide rod 14 passes through the guide rod hole 13-3 and serves to fix and adjust the guide rod 14.

[0072] like Figure 5 As shown, the offset adjustment frame 13 includes a fixing ring 13-1, packing 13-2, a smooth rod hole 13-3, an upper hinge seat 13-4, an upper support rod 13-5, a double hinge seat 13-6, a handwheel 13-7, a lead screw 13-8, a lower support rod 13-9, a lower hinge seat 13-10, and a base 13-11. The fixing ring 13-1 is welded to the upper hinge seat 13-4, and the fixing ring 13-1 contains the packing 13-2 and its smooth rod hole 13-3. The upper hinge seat 13-4 is axially connected to the upper support rod 13-5, the double hinge seat 13-6 is axially connected to the upper support rod 13-5 and the lower support rod 13-9, the lower support rod 13-9 is axially connected to the lower hinge seat 13-10, and the lower hinge seat 13-10 is welded and fixed to the base 13-11. Handwheel 13-7 is fixed to one end of lead screw 13-8. Rotating handwheel 13-7 clockwise rotates lead screw 13-8, pulling double hinge seat 13-6 and fixing ring 13-1 upwards. Rotating handwheel 13-7 counterclockwise rotates lead screw 13-8, pushing double hinge seat 13-6 and fixing ring 13-1 downwards. A smooth rod 14 passes through the smooth rod hole 13-3, moving up and down accordingly, adjusting the angle and distance of the C-type smooth rod seal 18 and A-type smooth rod seal 15. Lead screw 13-8 is internally threaded into double hinge seat 13-6; rotating lead screw 13-8 pushes and pulls double hinge seat 13-6 to move.

[0073] Structural diagram of the present invention Figure 6 The A-type smooth rod seal 15 is installed between the offset distance frame 13 and the four-way 17. The smooth rod 14 passes through its inner packing 15-3 and secondary packing 15-4, and hydraulic static and dynamic sealing performance tests are carried out.

[0074] like Figure 6As shown, the Type A smooth rod seal 15 includes a gland 15-1, a gland 15-2, a packing 15-3, a secondary packing 15-4, a packing tube 15-5, a sealing ring 15-6, a spring 15-7, an adjusting joint 15-8, an adjusting pressure cap 15-9, a sealing ring 15-10, and a clamp head 15-11, etc.

[0075] The gland 15-1 is threadedly connected to the packing tube 15-5. It contains a gland 15-2 and a packing 15-3. Tightening the gland 15-1 causes the gland 15-2 to press against the packing 15-3, thus sealing the smooth rod 14.

[0076] The alignment connector 15-8 is threadedly connected to the packing tube body 15-5. It contains a secondary packing 15-4, a sealing ring 15-6, and a spring 15-7. Tightening the packing tube body 15-5 compresses the secondary packing 15-4, sealing ring 15-6, and spring 15-7, thus sealing the smooth rod 14. The alignment connector 15-8 is connected to the sealing ring 15-10 and the clamp head 15-11 via the alignment cap 15-9, serving both sealing and alignment functions.

[0077] Structural diagram of the present invention Figure 7 The four-way valve 17 and its fixed parts are as follows: two of the four-way valves are installed between the type A smooth rod seal 15 and the type C smooth rod seal 22, and the other two are installed between the three-way valve 19 and the high-pressure hydraulic control valve 39, connected by clamps.

[0078] like Figure 7 As shown, the four-way connector 17 and its fixing parts include the right clamp head 17-1, the clamp 17-2, the four-way clamp head 17-3, the left clamp head 17-4, the fixing base plate 17-5, the bracket 17-6, the base 17-7, etc.

[0079] The clamp 17-2 is bolted to the fixed base plate 17-5, holding and fixing the four-way valve 17. The fixed plate 17-7 is welded to the bracket 17-6, and the base 17-7 of the bracket 17-6 is welded and fixed. The right clamp head 17-1 of the four-way valve 17 is clamped to the clamp head 15-11 of the A-type smooth rod sealer 15. The front of the four-way clamp head 17-3 is clamped to the high-pressure hydraulic control valve 39 and the test pressure pipe 38, and the rear is clamped to the circulation valve 20. The left clamp head 17-4 is clamped to the clamp seat 22-16 of the C-type smooth rod sealer 22.

[0080] Structural diagram of the present invention Figure 8 For the B-type smooth rod seal 18, install it on the tee 19 and connect it with a clamp. Install the test mandrel with the smallest applicable smooth rod specification in the smooth rod seal 18 and press the packing to perform a hydraulic static sealing performance test.

[0081] like Figure 8The B-type smooth rod seal shown includes 18 parts, such as grate 18-1, pressure cap 18-2, packing housing 18-3, packing 18-4, gasket 18-5, sealing cap 18-6, screw 18-7, rubber seat 18-8, rubber 18-9, clamp seat 18-10, etc.

[0082] The pressure cap 18-2 is threadedly connected to the packing housing 18-3. It contains a gland 18-1, packing 18-4, and a washer 18-5. A test mandrel of the smallest applicable size for the smooth rod is inserted into the tee 19 through the pressure cap 18-2, gland 18-1, and packing 18-4. Tightening the pressure cap 18-2 compresses the gland 18-1 and packing 18-4, thus compressing the packing 18-4 and sealing the mandrel, providing a primary seal.

[0083] The sealing cap 18-6 is threadedly connected to the packing housing 18-3. It contains a lead screw 18-7, a rubber seat 18-8, and a rubber 18-9. Tightening the lead screw 18-7 compresses the rubber 18-9, which acts as a sealing mandrel, i.e., a secondary seal.

[0084] Structural diagram of the present invention Figure 9 The C-type smooth rod seal 22 is installed between the four-way 17 and the angle adjustment frame 23. The smooth rod 14 passes through its inner packing 22-5 and rubber block 22-10 to conduct hydraulic static and dynamic sealing performance tests.

[0085] like Figure 9 As shown, the C-type smooth rod seal 22 includes an oil scraper packing 22-1, a gland 22-2, a pressure cap 22-3, a packing cylinder 22-4, a packing 22-5, a retainer 22-6, a rubber block seat 22-7, a top screw cap 22-8, a top screw 22-9, a rubber block 22-10, a ball head 22-11, a sealing ring 22-12, a ball head cap 22-13, a pressure cap 22-14, an adjusting disc 22-15, and a clamp seat 22-16, etc.

[0086] The pressure cap 22-3 is threadedly connected to the packing cylinder 22-4. It contains oil scraper packing 22-1 and gland 22-2. Oil scraper packing 22-1 presses on gland 22-2, and gland 22-2 presses on packing 22-5. Packing 22-5 is inside the packing cylinder 22-4 and presses on the stop 22-6. When the pressure cap 22-3 is tightened, the packing 22-5 acts as a seal for the polished rod 14, i.e., a primary seal.

[0087] The top screw cover 22-8 is threadedly connected to the packing cylinder 22-4. It contains a top screw 22-9, a rubber block seat 22-7, and a rubber block 22-10. When the top screw 22-9 is tightened and the rubber block 22-10 is radially compressed, it acts as a seal for the smooth rod 14, i.e., a secondary seal.

[0088] The ball head 22-11 is integrated with the packing cylinder 22-4 and is threadedly connected to the adjusting disc 22-15 via the ball head cover 22-13. The ball head 22-11 presses against the sealing ring 22-12 to provide a sealing function. When the packing cylinder 22-4 is under force, the ball head 22-11 rotates, which serves as a self-aligning function.

[0089] The adjusting disc 22-15 is threadedly connected to the clamp seat 22-16 via a pressure cap 22-14. The pressure cap 22-14 presses against the adjusting disc 22-15 to provide a sealing function, and the adjusting disc 22-15 is subjected to force to perform the adjusting function.

[0090] Structural diagram of the present invention Figure 10 The angle adjustment bracket 23 is installed between the C-type guide rod sealer 22 and the fixed baffle 24. The guide rod 14 passes through the guide rod hole 23-3 and serves to fix and adjust the guide rod 14.

[0091] like Figure 10 As shown, the angle adjustment frame 23 includes a fixing ring 23-1, packing 23-2, a smooth rod hole 23-3, an upper hinge seat 23-4, an upper support rod 23-5, a double hinge seat 23-6, a handwheel 23-7, a lead screw 23-8, a lower support rod 23-9, a lower hinge seat 23-10, and a base 23-11. The fixing ring 23-1 is welded to the upper hinge seat 23-4, and the fixing ring 23-1 contains the packing 23-2 and its smooth rod hole 23-3. The upper hinge seat 23-4 is axially connected to the upper support rod 23-5, the double hinge seat 23-6 is axially connected to the upper support rod 23-5 and the lower support rod 23-9, the lower support rod 23-9 is axially connected to the lower hinge seat 23-10, and the lower hinge seat 23-10 is welded and fixed to the base 23-11. Rotating handwheel 23-7 clockwise raises the fixing ring 23-1, while rotating it counterclockwise lowers it. A guide rod 14 passes through the guide rod hole 23-3, moving up and down accordingly to align the C-type guide rod seal 18 and adjust the distance of the A-type guide rod seal 15. The lead screw 13-8 is internally threaded into the double hinge seat 13-6; rotating the lead screw 13-8 pushes and pulls the double hinge seat 13-6 to move it.

[0092] The alignment detection system is composed of Figure 1 The device consists of a displacement sensor 16, an angle sensor 21, and an adjustment display screen 45, used to measure the eccentricity angle and adjustment distance of the polished rod seal. The displacement sensor 16 is installed on the type A polished rod seal 15 to detect its adjustment distance. The angle sensor 21 is installed on the type C polished rod seal 22 to detect its adjustment angle. The adjustment display screen 45 displays the adjustment distance and adjustment angle.

[0093] The tilting display screen 45 is connected to the displacement sensor 16 and the angle sensor 21 via cables. The displacement sensor 16 is installed on the tilting joint 15-8 of the A-type smooth rod sealer 15 by magnet or adhesive. The angle sensor 21 is installed on the ball head 22-11 of the C-type smooth rod sealer 22 by magnet or adhesive.

[0094] The pressure testing system is composed of Figure 1 The system comprises a well fluid tank 28, a supply valve 29, a heater 30, an inlet valve 31, a hydraulic station 32, a hydrostatic testing platform 33, an electric heating control box 34, a pressure testing monitoring and operation platform 35, an outlet pipe 36, an outlet valve 37, a pressure testing pipe 38, and a high-pressure hydraulic control valve 39. The well fluid tank 28 is connected to the heater 30 via the supply valve 29. The electric heating control box 34 provides power to the heater 30 and regulates the temperature of the heated well fluid. The heater 30 is connected to the inlet valve 31, which in turn is connected to the hydrostatic testing platform 33. The heated well fluid enters the hydrostatic testing platform 33 through the inlet valve 31. The pressure testing monitoring and operation platform 35 provides power to the hydrostatic testing platform 33 via a cable and regulates the pressure. After the pressure is regulated by the pressure testing monitoring and operation platform 35, the well fluid enters the smooth rod seal detection system via the outlet pipe 36, the outlet valve 37, the pressure testing pipe 38, and the high-pressure hydraulic control valve 39. The high-pressure hydraulic control valve 39 is connected to the four-way valve 17. The pressure testing monitoring and operation platform 35 controls the opening and closing of the high-pressure hydraulic control valve 39, providing different pressure stabilization times for the smooth rod seal detection system. The hydraulic station 32 is connected to the pressure testing monitoring and operation platform 35 via control lines and to the high-pressure hydraulic control valve 39 via hydraulic pipelines. The pressure testing monitoring and operation platform 35 regulates the opening and closing of the high-pressure hydraulic control valve 39 by the hydraulic station 32.

[0095] The pneumatic system is composed of Figure 1 The system consists of a pneumatic control valve 40, a pressurizing air pipe 41, an air compressor 42, an air supply valve 43, and an air compressor control box 44. The air compressor control box 44 provides power to the air compressor 42 via a cable. The pneumatic control valve 40 is connected to the hydrostatic testing platform 33 to regulate the air pressure on the platform. The air compressor 42 is connected to the pressurizing air pipe 41 and provides air pressure to the smooth rod seal detection system via the switching of the pneumatic control valve 40.

[0096] The circulatory system is composed of Figure 1 It consists of circulation valve 20, circulation pipeline 27, etc. Tee 19 is connected to circulation valve 20, and circulation valve 20 is connected to well fluid tank 28 via circulation pipeline 27. After the smooth rod seal detection system has finished operating, the high-pressure hydraulic control valve 39 is opened, and the pneumatic system is activated to pressurize and clean the well fluid in tee 17 and tee 19. The well fluid then enters well fluid tank 28 through circulation valve 20 and circulation pipeline 27 for recycling.

[0097] The specific testing indicators and methods of this invention will be described below.

[0098] The specific testing indicators for this invention are as follows:

[0099] According to the product procurement technical requirements of Shengli Oilfield: For example, Q / SLCG 0174-2017 gate packing eccentric universal polished rod seal. The specifications of a polished rod seal generally include: product model, polished rod diameter, rated working pressure, working temperature, adjustment angle, adjustment distance, total height, and sealing method. See Table 1.

[0100] Table 1 Model Specifications

[0101]

[0102] The adjustment distance is as follows: Install the inspection mandrel (smooth rod) of the smallest specification applicable to the smooth rod in the seal and tighten the packing. Measure the maximum lateral movement distance of the mandrel, which should meet the requirements of Table 1.

[0103] The adjustment angle is as follows: Move the ball head to its swing limit position, using the upper surface of the ball head cap as a reference plane, measure the minimum acute angle between the reference plane and the outer cylindrical surface of the ball head packing box using an angle gauge. Subtract this acute angle from 90° and multiply by 2 to obtain the adjustment angle. Alternatively, measure the maximum obtuse angle, subtract 90° from this obtuse angle, and multiply by 2 to obtain the adjustment angle. It should meet the requirements of Table 1.

[0104] The hydraulic sealing performance test is as follows: Install the test mandrel (polish) of the smallest specification applicable to the smooth rod in the seal and press the packing. Gradually increase the pressure to 1.5 times the rated working pressure specified in Table 1, stabilize the pressure for 3 minutes, and there should be no leakage or permanent deformation.

[0105] The hydraulic seal performance test is as follows: Install the test mandrel (polish) of the smallest specification applicable to the smooth rod in the sealer and press the packing. Gradually increase the pressure to 1.2 times the rated working pressure specified in Table 1. Hold at 6 strokes / minute for 15 minutes. There should be no leakage or permanent deformation.

[0106] The airtightness test is as follows: After the hydraulic static and dynamic sealing performance tests are completed, start the compressor to purge the well fluid. After the well fluid is cleaned, close the inlet and outlet well fluid valves and perform a static airtightness test. Gradually increase the pressure to 1.5 times the rated working pressure specified in Table 1 and hold the pressure for 3 minutes. There should be no leakage or permanent deformation. To perform a static airtightness test, gradually increase the pressure to 1.2 times the rated working pressure specified in Table 1 and maintain the pressure at 6 strokes per minute for 15 minutes. There should be no leakage or permanent deformation.

[0107] The specific testing method of this invention is as follows:

[0108] I. Inspection methods for the eccentricity angle and adjustment distance of the polished rod seal: When inspecting the adjustment distance parameter of the type A polished rod seal 15, loosen the adjustment cap 15-9 of the type A polished rod seal 15, and use the adjustment distance frame 13 to raise or lower the height of the polished rod 14. The polished rod 14 pulls the adjustment joint 15-8, causing displacement. The displacement distance is transmitted to the adjustment display screen 45 through the displacement sensor 16, thus measuring the adjustment distance index of the type A polished rod seal 15. When inspecting the adjustment angle parameter of the type C polished rod seal 22, loosen the ball head cap 22-13 of the type C polished rod seal 22, and use the adjustment angle frame 23 to raise or lower the height of the polished rod 14. The polished rod 14 pulls the ball head 22-11, causing tilting. The adjustment angle is transmitted to the adjustment display screen 45 through the angle sensor 21, displaying the acute angle value of the type C polished rod seal 22. The difference between 90° and this acute angle value, multiplied by 2, is the adjustment angle index. After inspection and recording, adjust the eight points of the wire rope 10, the offset distance frame 13, the smooth rod 14, the A-type smooth rod seal 15, the four-way connector 17, the C-type smooth rod seal 22, the offset angle frame 23, and the fixed baffle 24 to align them with a straight line. Then, tighten the offset pressure cap 15-9 of the A-type smooth rod seal 15 and the ball head cap 22-13 of the C-type smooth rod seal 22 respectively.

[0109] II. Hydraulic Dynamic and Static Sealing Test Methods for Polished Rod Seals

[0110] Different pressures are set on the pressure testing monitoring and operation platform 35, and different heating temperatures are set on the electric heating control box 34. At the same time, the air compressor control box 44 starts the air compressor 42 to supply air to the water pressure test platform 33 through the air supply valve 44, and controls the air pressure valves inside to adjust the outlet pressure of the water pressure test platform 33.

[0111] Well fluid enters the hydrostatic test platform 33 through an electric heating control box 34 with different heating temperatures set. The hydrostatic test platform 33 pressurizes the well fluid according to different pressures set, and the fluid enters the four-way valve 17 through the outlet pipe 36, outlet valve 37, test pressure pipe 38, and high-pressure hydraulic control valve 39. Well fluids at different temperatures and pressures entering the four-way valve respectively enter the A-type polished rod seal 15, B-type polished rod seal 18, three-way valve 19, and C-type polished rod seal 22.

[0112] When performing a static sealing test, the polished rod 14 should remain stationary. Gradually increase the pressure to 1.5 times the rated working pressure specified in Table 1, and stabilize the pressure for 3 minutes. There should be no leakage or permanent deformation. This is the static sealing test for the type B polished rod seal 18.

[0113] When performing dynamic sealing tests, start and adjust the frequency converter 1, and the polished rod 14 will reciprocate. Perform dynamic sealing tests on the type A polished rod seal 15 and type C polished rod seal 22 under different strokes, pressures, temperatures, and well fluids. Gradually increase the pressure to 1.2 times the rated working pressure specified in Table 1, and maintain the pressure at 6 strokes / min for 15 minutes. There should be no leakage or permanent deformation.

[0114] III. Air tightness test method for polished rod seal

[0115] The pneumatic system, consisting of a pneumatic control valve 40, a pressurizing air pipe 41, an air compressor 42, an air supply valve 43, and an air compressor control box 45, is used for air tightness testing and supplying air to the hydraulic test platform 34. When the pressure test system is stopped, the pneumatic system is started via the air compressor control box 44. The air compressor 42 introduces air into the test platform system through the pressurizing air pipe 41 and the high-pressure hydraulic control valve 39 to test the air tightness of the type A smooth rod seal 15, type B smooth rod seal 18, and type C smooth rod seal 22.

[0116] After the hydraulic dynamic and static sealing tests of the smooth rod seal are completed, close the outlet valve 37, open the high-pressure hydraulic control valve 39, close the air supply valve 43, open the air control valve 40 and the circulation valve 20, and start the air compressor 42 through the air compressor control box 44. The air compressor 42 pumps air through the pressurization pipe 41 and the high-pressure hydraulic control valve 39 to the four-way valve 17, the circulation valve 20, and the circulation pipeline 27 to clean the lines. After cleaning, close the valve of the well fluid tank 28 and the circulation valve 20. To perform a static airtightness test, gradually increase the pressure to 1.5 times the rated working pressure specified in Table 1, stabilize the pressure for 3 minutes, and there should be no leakage or permanent deformation. To perform a dynamic airtightness test, gradually increase the pressure to 1.2 times the rated working pressure specified in Table 1, maintain the pressure at 6 times / minute for 15 minutes, and there should be no leakage or permanent deformation.

[0117] The following are several specific embodiments of the application of the present invention.

[0118] Example 1: Inspection method for the eccentricity angle and adjustment distance of the smooth rod seal.

[0119] When inspecting the adjustment distance parameter of the Type A smooth rod seal 15, loosen the adjustment cap 15-9 of the Type A smooth rod seal 15. Use the adjustment distance bracket 13 to raise or lower the height of the smooth rod 14. The smooth rod 14 pulls the adjustment joint 15-8, causing displacement. The displacement distance is transmitted to the adjustment display screen 45 through the displacement sensor 16, thus measuring the adjustment distance index of the Type A smooth rod seal 15. If the adjustment distance is less than or equal to 16mm, the inspection is qualified; otherwise, it is unqualified.

[0120] When checking the deviation angle parameter of the C-type polished rod seal 22, loosen the ball head cover 22-13 of the C-type polished rod seal 22, lift or lower the height of the polished rod 14 with the deviation angle bracket 23. The polished rod 14 pulls the ball head 22-11 to tilt. The deviation angle is transmitted to the deviation display screen 45 through the angle sensor 21, and the acute angle value of the C-type polished rod seal 22 is displayed. Multiply the difference between 90 and the acute angle value by 2, which is the deviation angle index. If the deviation angle is less than or equal to 4°, the inspection is qualified; otherwise, it is unqualified.

[0121] After the inspection and recording are completed, adjust the wire rope 10, deviation distance bracket 13, polished rod 14, A-type polished rod seal 15, four-way joint 17, C-type polished rod seal 22, deviation angle bracket 23, fixed baffle 24, etc. to be in a straight line, and then tighten the deviation adjusting nut 15-9 of the A-type polished rod seal 15 and the ball head cover 22-13 of the C-type polished rod seal 22 respectively.

[0122] Example 2: Conduct the hydraulic static and dynamic sealing tests of the polished rod seal.

[0123] During the inspection, select well fluids with different viscosities, freezing points, and salinities. The well fluid in the well fluid tank 28 is a mixture of crude oil and raw water.

[0124] Under the condition of a mixture of high-viscosity, high-freezing-point crude oil and high-salinity raw water, conduct the high-temperature and low-pressure hydraulic dynamic sealing test. Assume that the crude oil viscosity is 400 mPa·s, the crude oil freezing point is 30 °C, the raw water salinity is 8000 mg / L, the mixture temperature is 80 °C, and the pressure test pressure is 1.0 MPa. Run for 24 hours at a stroke frequency of 4 times per minute; run for 24 hours at a stroke frequency of 6 times per minute. There is no leakage and permanent deformation at each connection, the body, and the packing of the A-type polished rod seal 15 and the C-type polished rod seal 22, and the inspection is qualified; otherwise, it is unqualified. There is no leakage and permanent deformation of the B-type polished rod seal 18.

[0125] Under the condition of a mixture of high-viscosity, high-freezing-point crude oil and high-salinity raw water, conduct the high-pressure and low-temperature hydraulic static sealing test. Assume that the crude oil viscosity is 400 mPa·s, the crude oil freezing point is 30 °C, the raw water salinity is 8000 mg / L, the mixture temperature is 40 °C, and the pressure test pressure is 12 MPa. There is no leakage and permanent deformation at each connection, the body, and the packing of the A-type polished rod seal 15, the B-type polished rod seal 18, and the C-type polished rod seal 22, and the inspection is qualified; otherwise, it is unqualified.

[0126] Under the condition of a mixture of low-viscosity and low-freezing-point crude oil and low-salinity raw water, a high-temperature and low-pressure hydraulic dynamic sealing test is carried out. Assume that the crude oil viscosity is 80 mPa·s, the crude oil freezing point is 15 °C, the raw water high salinity is 3000 mg / L, the mixture temperature is 80 °C, and the test pressure is 1.0 MPa. At a stroke frequency of 4 times per minute, it runs for 24 h; at a stroke frequency of 6 times per minute, it runs for 24 h. There is no leakage and permanent deformation at each connection, the body, and the packing of the Type A polished rod seal 15 and the Type C polished rod seal 22, and the inspection is qualified, otherwise it is unqualified. There is no leakage and permanent deformation of the Type B polished rod seal 18.

[0127] Under the condition of a mixture of low-viscosity and low-freezing-point crude oil and low-salinity raw water, a high-pressure and low-temperature static hydraulic dynamic sealing test is carried out. Assume that the crude oil viscosity is 80 mPa·s, the crude oil freezing point is 15 °C, the raw water high salinity is 3000 mg / L, the mixture temperature is 40 °C, and the test pressure is 9.6 MPa. There is no leakage and permanent deformation at each connection, the body, and the packing of the Type A polished rod seal 15, the Type B polished rod seal 18, and the Type C polished rod seal 22, and the inspection is qualified, otherwise it is unqualified.

[0128] Example 3: Airtightness test of the polished rod seal.

[0129] After the hydraulic dynamic and static sealing tests of the polished rod seal are completed, close the liquid outlet valve 37, open the high-pressure hydraulic control valve 39, close the air supply valve 43, open the air control valve 40 and the circulation valve 20, and start the air compressor 42 through the air compressor control box 44. The air compressor 42 blows and sweeps the four-way 17, the circulation valve 20, and the circulation pipeline 27 through the pressure boosting air pipe 41 and the high-pressure hydraulic control valve 39. After sweeping is completed, close the valve of the inlet well liquid tank 28 and the circulation valve 20.

[0130] Start the air compressor 42 through the air compressor control box 44 to compress air into the pressure boosting air pipe 41, and enter the four-way 17 through the test pressure pipe 38 and the high-pressure hydraulic control valve 39 to supply air to the Type A polished rod seal 15, the Type B polished rod seal 18, and the Type C polished rod seal 22.

[0131] For the static airtightness test, gradually pressurize to 1.5 times the rated working pressure specified in Table 1 and stabilize the pressure for 3 min. There is no leakage or air leakage at each connection, the body, and the packing of the Type A polished rod seal 15, the Type B polished rod seal 18, and the Type C polished rod seal 22, and the inspection is qualified, otherwise it is unqualified. For the dynamic airtightness test, gradually pressurize to 1.2 times the rated working pressure specified in Table 1, and at a stroke frequency of 6 times per minute, maintain for 15 min. There is no leakage or air leakage at each connection, the body, and the packing of the Type A polished rod seal 15 and the Type C polished rod seal 22, and the inspection is qualified, otherwise it is unqualified. There is no leakage and permanent deformation of the Type B polished rod seal 18.

[0132] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0133] Except for the technical features described in the specification, all other technologies are known to those skilled in the art.

Claims

1. A testing device for smooth rod seals, characterized in that, The polished rod seal inspection device includes a rotary power system, a polished rod seal detection system, an alignment detection system, a pressure testing system, a pneumatic system, and a circulation system. The rotary power system is connected to the polished rod seal detection system, providing tension, stroke, and number of strokes. The polished rod seal detection system is connected to the alignment detection system and the pressure testing system, providing the alignment detection system with the alignment angle and alignment distance, and providing the pressure testing system with the polished rod seal and platform. The pressure testing system is connected to the pneumatic system and the circulation system, providing the polished rod seal detection system with the testing well fluid, temperature, pressure, and time. The pneumatic system provides the pressure and testing gas to the pressure testing system, and the testing well fluid in the polished rod seal detection system is purged and enters the circulation system.

2. The inspection device for a smooth rod seal according to claim 1, characterized in that, The rotary power system includes a frequency converter cabinet, a speed control unit, a motor, a turntable, a speed measurement platform, a rotating handle, a wire rope, a fixed pulley, and a suspension device. The frequency converter cabinet is connected to the motor, providing power and adjusting the speed. The rotating handle and the turntable are mounted on the motor shaft. The speed measurement platform is installed between the frequency converter cabinet, the speed control unit, and the fixed pulley, measuring the speed signal of the turntable and transmitting it to the speed control unit for display, thus adjusting the stroke and stroke rate. The wire rope is connected to the rotating handle, the fixed pulley, and the suspension device, and pulls the optical rod of the optical rod sealing detection system to reciprocate through the fixed pulley and the suspension device.

3. The inspection device for a smooth rod seal according to claim 2, characterized in that, The rotary power system also includes multiple stroke holes and a rotating pin. The rotating handle is provided with the multiple stroke holes, and the rotating pin is connected to the rotating handle bearing through the stroke hole. The rotating pin is fixed in the stroke hole and connected to the bearing for free rotation. The rotating pin pulls the wire rope to make a circular reciprocating motion as the rotating handle rotates. The wire rope pulls the guide rod to make a reciprocating motion through the fixed pulley and the suspension device. By adjusting the stroke hole where the rotating pin is located on the rotating handle, the reciprocating distance of the guide rod is different, and the distance is the stroke.

4. The inspection device for a smooth rod seal according to claim 2, characterized in that, The speed measurement platform includes a speed sensor, a connecting rod, a bracket, and a floor. The floor is used to fix the motor, the bracket is fixed to the floor, one end of the connecting rod is fixed to the speed sensor, and the other end is fixed to the bracket. The speed sensor measures the rotation speed signal of the turntable and transmits the rotation speed signal to the speed control unit.

5. The inspection device for a smooth rod seal according to claim 2, characterized in that, The suspension device is installed between the offset distance frame of the smooth rod sealing detection system and the fixed pulley, and serves to connect the smooth rod and the wire rope.

6. The inspection device for a smooth rod seal according to claim 5, characterized in that, The suspension device includes a suspension body, a plumb bob, a suspension connector, a smooth rod connector, and a pressure plate screw hole. The suspension body is connected to the steel wire rope through the plumb bob. The suspension connector is threaded to the smooth rod through the smooth rod connector. The pressure plate is fixed to the suspension body by screws into the pressure plate screw hole, thus fixing the steel wire rope and serving to connect the smooth rod and the steel wire rope.

7. The inspection device for a smooth rod seal according to claim 1, characterized in that, The smooth rod sealing testing system includes a smooth rod and, in sequence, an adjustment distance frame, an A-type smooth rod seal, a four-way valve, a C-type smooth rod seal, an adjustment angle frame, a fixed baffle, a spring, and a smooth rod coupling. The adjustment distance frame and the adjustment angle frame provide adjustment displacement and support force for the smooth rod. The smooth rod reciprocates within the A-type smooth rod seal, the four-way valve, and the C-type smooth rod seal to test the wear-resistant sealing performance of the packing inside. The spring passes through the smooth rod to provide tension, the fixed baffle acts to block the spring, and the smooth rod coupling fixes the spring.

8. The inspection device for a smooth rod seal according to claim 7, characterized in that, The fixing baffle includes screws, an upper plate, a guide rod hole, a lower plate, a steel plate, a reinforcing rib, and a base. The upper plate is connected and fixed to the lower plate by the screws. The lower plate is welded to the steel plate and the reinforcing rib. The steel plate and the reinforcing rib are welded to the base. The base is fixed to the floor. The guide rod passes through the guide rod hole. The fixing baffle flattens and fixes the guide rod and blocks the spring.

9. The inspection device for a smooth rod seal according to claim 7, characterized in that, The offset adjustment bracket includes a fixed ring, packing, a guide rod hole, an upper hinge seat, a lead screw, an upper support rod, a double hinge seat, a lower support rod, a lower hinge seat, and a base. The fixed ring is welded to the upper hinge seat, and the packing and the guide rod hole are installed inside the fixed ring. The upper hinge seat is shaft-connected to the upper support rod, and the double hinge seat is shaft-connected to the upper and lower support rods. The lower support rod is shaft-connected to the lower hinge seat, and the lower hinge seat is welded and fixed to the base. A handwheel is fixed to one end of the lead screw. Rotating the handwheel clockwise raises the fixed ring, and rotating the handwheel counterclockwise lowers the fixed ring. The guide rod passes through the guide rod hole and moves up and down accordingly, thus adjusting the offset angle and offset distance of the C-type guide rod seal and the A-type guide rod seal.

10. The inspection device for a smooth rod seal according to claim 7, characterized in that, The Type A smooth rod seal includes a gland, gland, packing, secondary packing, packing tube, sealing ring, sealer spring, adjusting connector, adjusting cap, sealing ring, and clamp head. The gland is threaded to the packing tube and contains the gland and packing. Tightening the gland compresses the packing, sealing the smooth rod. The adjusting connector is threaded to the packing tube and contains the secondary packing, sealing ring, and sealer spring. Tightening the packing tube compresses the secondary packing, sealing ring, and sealer spring, sealing the smooth rod. The adjusting connector connects to the sealing ring and clamp head via the adjusting cap, serving both sealing and adjusting functions. The smooth rod passes through the packing and secondary packing, and hydraulic static and dynamic sealing performance tests are conducted.

11. The inspection device for a smooth rod seal according to claim 7, characterized in that, The polished rod sealing test system also includes a type B polished rod seal and a tee. The type B polished rod seal is installed on the tee and connected by a clamp. A test mandrel of the smallest applicable polished rod specification is installed in the polished rod seal and the packing is pressed to perform a hydraulic static sealing performance test.

12. The inspection device for a smooth rod seal according to claim 11, characterized in that, The Type B smooth rod seal includes a gland, a pressure cap, a packing housing, packing, a washer, a sealing cap, a lead screw, a rubber seat, a rubber, and a clamp seat. The pressure cap is threaded to the packing housing and contains the gland, packing, and washer. A test mandrel of the smallest specification applicable to the smooth rod is installed, passing through the pressure cap, gland, and packing and inserted into the tee. Tightening the pressure cap compresses the gland and packing, thus sealing the mandrel, i.e., primary sealing. The sealing cap is threaded to the packing housing and contains the lead screw, rubber seat, and rubber. Tightening the lead screw compresses the rubber, thus sealing the mandrel, i.e., secondary sealing. The clamp seat is an integral structure with the packing housing. Below the rubber, the clamp seat is connected to the tee via the clamp seat.

13. The inspection device for a smooth rod seal according to claim 11, characterized in that, The four-way connector includes a right clamp head, a retaining clamp, a four-way clamp head, a left clamp head, a fixed base plate, a bracket, and a base. The retaining clamp is bolted to the fixed base plate to hold and fix the four-way connector. The fixed base plate is welded to the bracket, and the bracket is welded to the base. The right clamp head of the four-way connector is clamped to the clamp head of the A-type smooth rod seal. The front of the four-way clamp head is connected to the clamp of the high-pressure hydraulic control valve and the pressure test pipe of the pressure testing system, and the rear is connected to the clamp of the circulation valve of the circulation system. The left clamp head is clamped to the clamp seat of the C-type smooth rod seal.

14. The inspection device for a smooth rod seal according to claim 13, characterized in that, Two of the four-way valves are installed between the type A smooth rod seal and the type C smooth rod seal, and the other two are installed between the three-way valve and the high-pressure hydraulic control valve, connected by clamps.

15. The inspection device for a smooth rod seal according to claim 7, characterized in that, The C-type polished rod seal includes an oil scraper packing, a gland, a packing cylinder, a packing, a stop, a rubber block seat, a set screw cap, a set screw, a rubber block, a ball head, a sealing ring, a ball head cap, a pressure cap, an adjusting disc, and a clamp seat. The pressure cap is threadedly connected to the packing cylinder and contains the oil scraper packing and the gland. The oil scraper packing presses against the gland, and the gland presses against the packing. The packing is located inside the packing cylinder and presses against the stop. Tightening the pressure cap allows the packing to seal the polished rod when axially compressed, thus providing a primary seal. The set screw cap is threadedly connected to the packing cylinder and contains the... The set screw, the rubber block seat, and the rubber block are tightened. When the set screw is tightened, the rubber block, when radially compressed, seals the polished rod, i.e., a secondary seal. The ball head is integrated with the packing cylinder and is threadedly connected to the adjusting disc through the ball head cap. The ball head presses on the sealing ring to provide a seal. When the packing cylinder is under force, the ball head rotates, providing a self-aligning function. The adjusting disc is threadedly connected to the clamp seat through the pressure cap. The pressure cap presses on the adjusting disc to provide a seal. When the adjusting disc is under force, it provides a pitch adjustment function. The polished rod passes through the inner packing and the rubber block to conduct hydraulic static and dynamic sealing performance tests.

16. The inspection device for a smooth rod seal according to claim 7, characterized in that, The angle adjustment frame includes a fixed ring, packing, a guide rod hole, an upper hinge seat, a lead screw, an upper support rod, a double hinge seat, a handwheel, a lower support rod, a lower hinge seat, and a base. The fixed ring is welded to the upper hinge seat, and the fixed ring contains the packing and the guide rod hole. The upper hinge seat is shaft-connected to the upper support rod, and the double hinge seat is shaft-connected to the upper and lower support rods. The lower support rod is shaft-connected to the lower hinge seat, and the lower hinge seat is welded and fixed to the base. The handwheel is fixed to one end of the lead screw. Rotating the handwheel clockwise raises the fixed ring, and rotating the handwheel counterclockwise lowers the fixed ring. The guide rod passes through the guide rod hole and moves up and down accordingly, thus adjusting the angle and distance of the C-type guide rod seal and the A-type guide rod seal. The guide rod passes through the guide rod hole, which serves to fix and adjust the guide rod.

17. The inspection device for a smooth rod seal according to claim 7, characterized in that, The misalignment detection system includes a displacement sensor, an angle sensor, and a misalignment display screen. The displacement sensor is installed on the A-type smooth rod seal to detect its misalignment distance, and the angle sensor is installed on the C-type smooth rod seal to detect its misalignment angle. The misalignment display screen is connected to the displacement sensor and the angle sensor respectively to display the misalignment distance and the misalignment angle.

18. The inspection device for a smooth rod seal according to claim 1, characterized in that, The pressure testing system includes a well fluid tank, a supply valve, a heater, an inlet valve, a hydraulic station, a hydrostatic testing platform, an electric heating control box, a pressure testing monitoring and operation platform, an outlet pipe, an outlet valve, a test pipe, and a high-pressure hydraulic control valve. The well fluid tank is connected to the heater via the supply valve. The electric heating control box provides power to the heater and regulates the temperature of the heated well fluid. The heater is connected to the inlet valve, which is connected to the hydrostatic testing platform. The heated well fluid enters the hydrostatic testing platform through the inlet valve. The pressure testing monitoring and operation platform is connected to the hydrostatic testing platform via a cable. The system provides electrical power and regulates pressure. After the pressure is regulated by the pressure testing and monitoring platform, the well fluid enters the polished rod seal detection system through the outlet pipe, outlet valve, pressure testing pipe, and high-pressure hydraulic control valve. The high-pressure hydraulic control valve is connected to the four-way valve of the polished rod seal detection system. The pressure testing and monitoring platform controls the opening and closing of the high-pressure hydraulic control valve to provide different pressure stabilization times for the polished rod seal detection system. The hydraulic station is connected to the pressure testing and monitoring platform and is connected to the high-pressure hydraulic control valve through the hydraulic pipeline. The pressure testing and monitoring platform regulates the opening and closing of the high-pressure hydraulic control valve by the hydraulic station.

19. The inspection device for a smooth rod seal according to claim 18, characterized in that, The circulation system includes a circulation valve and a circulation pipeline. The tee of the polished rod seal detection system is connected to the circulation valve. The circulation valve is connected to the well fluid tank through the circulation pipeline. After the polished rod seal detection system has finished operating, the high-pressure hydraulic control valve is opened, and the pneumatic system is started to pressurize and clean the well fluid in the tee and four-way valves of the polished rod seal detection system. The well fluid then enters the well fluid tank through the circulation valve and circulation pipeline for recycling and reuse.

20. The inspection device for a smooth rod seal according to claim 1, characterized in that, The pneumatic system includes a pneumatic control valve, a pressurizing air pipe, an air compressor, an air supply valve, and an air compressor control box. The air compressor control box provides power to the air compressor via a cable. The pneumatic control valve is connected to the hydrostatic test platform of the pressure testing system to regulate the air pressure of the hydrostatic test platform. The air compressor is connected to the pressurizing air pipe and provides air pressure to the smooth rod seal testing system through the switching of the pneumatic control valve.

21. A method for inspecting the eccentricity angle and adjustment distance of a smooth rod seal, characterized in that, The method for inspecting the eccentricity angle and adjustment distance of the polished rod seal uses the polished rod seal inspection device as described in claim 1, comprising: When inspecting the adjustment distance parameter of the Type A smooth rod seal, loosen the adjustment cap of the Type A smooth rod seal, use the adjustment distance to lift or lower the height of the smooth rod, the smooth rod pulls the adjustment joint to cause displacement, the displacement distance is transmitted to the adjustment display screen through the displacement sensor, and the adjustment distance index of the Type A smooth rod seal 15 is measured. When inspecting the adjustment angle parameter of the C-type smooth rod seal, loosen the ball head cover of the C-type smooth rod seal, use the adjustment angle bracket to lift or lower the height of the smooth rod, the smooth rod pulls the ball head to tilt, the adjustment angle is transmitted to the adjustment display screen through the angle sensor, and the acute angle value of the C-type smooth rod seal is displayed. 90 minus the difference of the acute angle value multiplied by 2 is the adjustment angle index.

22. The method for inspecting the eccentricity angle and adjustment distance of the smooth rod seal according to claim 21, characterized in that, The inspection method for the eccentric angle and adjustment distance of the polished rod seal also includes adjusting the steel wire rope, the adjustment distance frame, the polished rod, the A-type polished rod seal, the four-way valve, the C-type polished rod seal, the adjustment angle frame, and the fixed baffle to align the eight points with the line after inspection and recording. Then, the adjustment cap of the A-type polished rod seal and the ball head cap of the C-type polished rod seal are tightened respectively.

23. A method for testing the hydraulic dynamic and static sealing performance of a smooth rod seal, characterized in that, The hydraulic dynamic and static sealing performance testing method for the polished rod seal uses the polished rod seal testing device as described in claim 1, comprising: Different pressures are set on the pressure testing monitoring and operation platform, and different heating temperatures are set on the electric heating control box. At the same time, the air compressor control box starts the air compressor to supply air to the water pressure test platform through the air supply valve, and controls the various air pressure valves inside to adjust the outlet pressure of the water pressure test platform. Well fluid enters the hydrostatic test platform through an electric heating control box with different heating temperatures set. The hydrostatic test platform pressurizes the well fluid according to different pressures set. The fluid then enters the four-way valve through the outlet pipe, outlet valve, test pipe, and high-pressure hydraulic control valve. Well fluids at different temperatures and pressures enter the A-type polished rod seal, B-type polished rod seal, three-way valve, and C-type polished rod seal, respectively. When performing a static sealing test, the smooth rod remains stationary. Gradually increase the pressure to 1.5 times the rated working pressure and stabilize the pressure for 3 minutes. There should be no leakage or permanent deformation. This is the static sealing test for the type B smooth rod seal. When performing dynamic sealing tests, start and adjust the frequency converter cabinet to generate reciprocating motion of the polished rod. Perform dynamic sealing tests on the Type A and Type C polished rod seals under different strokes, pressures, temperatures, and well fluids. Gradually increase the pressure to 1.2 times the rated working pressure and maintain it at a stroke rate of 6 times / minute for 15 minutes. There should be no leakage or permanent deformation.

24. A method for testing the airtightness of a smooth rod seal, characterized in that, The airtightness testing method for the polished rod seal uses the polished rod seal testing device as described in claim 1, comprising: The pneumatic system, consisting of a pneumatic control valve, a pressurizing air pipe, an air compressor, an air supply valve, and an air compressor control box, is used for air tightness testing and supplying air to the hydraulic test platform. When the test system is stopped, the pneumatic system is started through the air compressor control box. The air compressor introduces air into the test platform system through the pressurizing air pipe and the high-pressure hydraulic control valve to test the air tightness of the Type A, Type B, and Type C smooth rod seals. After the hydraulic dynamic and static sealing of the polished rod sealer is tested, close the liquid outlet valve, open the high-pressure hydraulic control valve, close the air supply valve, open the air control valve and the circulation valve, start the air compressor through the air compressor control box, and the air compressor pumps air to the four-way valve and circulation pipeline through the pressurization pipe and the high-pressure hydraulic control valve to clean the line. After cleaning, close the valve of the well fluid tank and the circulation valve. For static airtightness testing, gradually increase the pressure to 1.5 times the rated working pressure and stabilize the pressure for 3 minutes. There should be no leakage or permanent deformation. For dynamic airtightness testing, gradually increase the pressure to 1.2 times the rated working pressure and maintain the pressure at 6 times per minute for 15 minutes. There should be no leakage or permanent deformation.

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