CN-121994477-A - Dynamic seal pressure test device and method for polished rod

Abstract

The invention belongs to the technical field of sealing of an oil pumping polished rod and a packing box, and particularly relates to a polished rod dynamic sealing pressure test device and a polished rod dynamic sealing pressure test method. The utility model provides a polished rod dynamic seal pressure testing device, includes polished rod, two packing boxes and control cabinet, is equipped with the cross between two packing boxes, the polished rod passes the packing box is connected with the cross and power supply, the polished rod forms sealedly in packing box department, one side of cross is connected with pressure sensor, pressure sensor is connected with pressure monitoring record appearance, the opposite side sealing connection of cross has the energy storage bottle, the energy storage bottle has the force (forcing) pump through high-pressure line connection, the control cabinet is connected with force (forcing) pump and power supply electricity respectively. The invention adopts the power source to provide linear motion to simulate the motion of the polish rod so as to test and examine the influence of polish rods with different shapes and packing box structures on the sealing performance under the condition of pressure.

Inventors

• ZHANG ZHONGQIN
• JI WANRONG
• HE JUN
• WANG YANFENG
• XIE YU
• WANG WENGANG
• ZHANG XINGPEI
• HE XIAXIA

Assignees

• 中国石油天然气股份有限公司

Dates

Publication Date

20260508

Application Date

20241107

Claims (7)

1. 1. The polish rod dynamic seal pressure test device is characterized by comprising a polish rod (1), two packing boxes (2) and a control console (11), wherein a four-way valve (3) is arranged between the two packing boxes (2), the polish rod (1) passes through the packing boxes (2) and is connected with a power source (9) through the four-way valve (3), the polish rod (1) forms a seal at the packing boxes (2), one side of the four-way valve (3) is connected with a pressure sensor (7), the pressure sensor (7) is connected with a pressure monitoring recorder (8), the other side of the four-way valve (3) is connected with an energy storage bottle (4) in a sealing manner, the energy storage bottle (4) is connected with a pressurizing pump (5) through a high-pressure pipeline, and the control console (11) is respectively electrically connected with the pressurizing pump (5) and the power source (9).
2. 2. The polish rod dynamic seal pressure test device according to claim 1, wherein the side of the four-way joint (3) connected with the pressure sensor (7) is also provided with a pressure gauge (6).
3. 3. The polish rod dynamic seal pressure test device according to claim 1, wherein a limiter (10) is arranged at the designed travel positions of the two ends of the polish rod (1), and the limiter (10) is electrically connected with a control console (11).
4. 4. The polish rod dynamic seal pressure test device according to claim 1, wherein the power source (9) comprises a compressed air station and an air cylinder, and the air cylinder is driven by the compressed air station to drive the polish rod (1) to do reciprocating linear motion.
5. 5. The polish rod dynamic seal pressure test device according to claim 1, wherein the power source (9) comprises a hydraulic station and a hydraulic cylinder, and the hydraulic station drives the hydraulic cylinder to drive the polish rod (1) to do reciprocating linear motion.
6. 6. The polish rod dynamic seal pressure test device according to claim 1, wherein the power source (9) comprises a motor, a speed reducer, a crank, a connecting rod and a sliding block, and the motor drives the speed reducer, the crank, the connecting rod and the sliding block to drive the polish rod (1) to do reciprocating linear motion.
7. 7. The polish rod dynamic seal pressure test method using the polish rod dynamic seal pressure test device as claimed in claim 1, and is characterized by comprising the following steps: S1, a booster pump (5) is communicated with an energy storage bottle (4) in a sealing way through a high-pressure pipeline, the energy storage bottle (4) is connected with a four-way valve (3) in a sealing way, and pressure is transmitted to a sealing position of a polished rod (1) and a packing box (2) in a range of 1.6-25 MPa; S2, starting a power source (9) to drive a polish rod (1) to do reciprocating linear motion, enabling the polish rod (1) to pass through a packing box (2) and a four-way (3) and forming sealing at the packing box (2), controlling the stroke of the polish rod (1) by a limiter (10) arranged at two ends, transmitting signals of the limiter (10) to a control console (11), controlling an electric element of the control console (11) to act, controlling the polish rod (1) to change direction, and testing dynamic sealing pressure by reciprocating operation of the polish rod (1); and S3, the pressure sensor (7) is connected with the four-way valve (3) through threads, the monitored pressure change is transmitted to the pressure monitoring recorder (8), the pressure monitoring recorder (8) receives the signal of the pressure sensor (7) and converts the signal into a pressure value, the sealing performance of the polish rod (1) and the packing box (2) is judged through pressure monitoring record, and the influence of the shape of the polish rod (1) and the sealing structure of the packing box (2) on the sealing performance can be analyzed.

Description

Dynamic seal pressure test device and method for polished rod Technical Field The invention belongs to the technical field of sealing of an oil pumping polished rod and a packing box, and particularly relates to a polished rod dynamic sealing pressure test device and a polished rod dynamic sealing pressure test method. Background In the sucker rod pumping system, a wellhead polished rod makes reciprocating linear motion relative to a packing box, and the sealing performance of the sucker rod pumping system relates to the aspects of safe production, environmental protection, pumping efficiency and the like. Because the length of the polish rod is 8-10 meters, the dynamic sealing performance of the polish rod and the packing box is difficult, the prior art only has the static sealing performance of the polish rod and the packing box, the sealing performance of the polish rod and the packing box can not be completely reflected, and the roundness of the polish rod exceeds the standard, and the sealing structure affects the sealing performance. The patent CN212180240U discloses a static and dynamic simulation test device of a polish rod sealer, which is mainly used for simulating on-site static and dynamic sealing performance and performance parameters such as the service life of a conical packing rubber sealing piece to carry out test and verification work when a polish rod sealer is researched and developed and manufactured in factories, but can only carry out test under normal pressure, and cannot realize dynamic pressure test. Disclosure of Invention Aiming at the problems, the invention aims to provide a polish rod dynamic sealing pressure test device and a method, wherein the device adopts a power source to provide linear motion to simulate polish rod motion so as to test and test the influence of polish rods with different shapes and packing box structures on sealing performance under the condition of pressure. The technical scheme of the invention is that the polish rod dynamic seal pressure test device comprises a polish rod, two packing boxes and a control console, wherein a four-way joint is arranged between the two packing boxes, the polish rod penetrates through the packing boxes and is connected with a power source through the four-way joint, the polish rod forms a seal at the packing boxes, one side of the four-way joint is connected with a pressure sensor, the pressure sensor is connected with a pressure monitoring recorder, the other side of the four-way joint is connected with an energy storage bottle in a sealing manner, the energy storage bottle is connected with a pressurizing pump through a high-pressure pipeline, and the control console is respectively and electrically connected with the pressurizing pump and the power source. And one side of the four-way joint, which is connected with the pressure sensor, is also provided with a pressure gauge. And the design travel positions at the two ends of the polish rod are provided with limiters, and the limiters are electrically connected with the control console. The power source comprises a compressed air station and an air cylinder, and the air cylinder is driven by the compressed air station to drive the polish rod to do reciprocating linear motion. The power source comprises a hydraulic station and a hydraulic cylinder, and the hydraulic station drives the hydraulic cylinder to drive the polish rod to do reciprocating linear motion. The power source comprises a motor, a speed reducer, a crank, a connecting rod and a sliding block, and the motor drives the speed reducer, the crank, the connecting rod and the sliding block to drive the polish rod to do reciprocating linear motion. A polish rod dynamic seal pressure test method, which uses the polish rod dynamic seal pressure test device, comprises the following steps: S1, a booster pump is communicated with an energy storage bottle in a sealing way through a high-pressure pipeline, the energy storage bottle is connected with a four-way joint in a sealing way, and pressure is transmitted to a sealing position of a polished rod and a packing box, wherein the pressure range is 1.6-25 MPa; S2, starting a power source to drive the polish rod to do reciprocating linear motion, enabling the polish rod to pass through the packing box and the four-way joint, forming sealing at the packing box, controlling the stroke of the polish rod by limiters arranged at two ends, transmitting signals of the limiters to a control console, controlling the motion of electric elements of the control console, controlling the reversing of the polish rod, and testing dynamic sealing pressure by the reciprocating motion of the polish rod; and S3, the pressure sensor is connected with the four-way joint through threads, the monitored pressure change is transmitted to the pressure monitoring recorder, the pressure monitoring recorder receives the pressure sensor signal and converts the pressure sensor signal into a pressure v