Dynamic sealing pressure test device and method for polished rod

Abstract

The invention belongs to the technical field of oil pumping polish rod and packing box sealing, and particularly relates to a polish rod dynamic sealing pressure testing device and method. A polish rod dynamic sealing pressure testing device comprises a polish rod, two packing boxes and a control console, a four-way joint is arranged between the two packing boxes, the polish rod penetrates through the packing boxes and is connected with the four-way joint and a power source, the polish rod is sealed at the packing boxes, one side of the four-way joint is connected with a pressure sensor, and the other 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 sealed mode, the energy storage bottle is connected with a pressure pump through a high-pressure pipeline, and the console is electrically connected with the pressure pump and the power source. According to the invention, a power source is adopted to provide linear motion to simulate polish rod motion so as to test the influence of polish rods in different shapes and packing box structures on the sealing performance under a pressure condition.

Description

Technical Field

[0001] This invention belongs to the field of oil sucker rod and packing box sealing technology, and specifically relates to a dynamic sealing pressure testing device and method for a sucker rod. Background Technology

[0002] In rod-operated pumping systems, the polished rod at the wellhead reciprocates linearly relative to the packing box, and its sealing performance is crucial to safety, environmental protection, and pumping efficiency. Because the polished rod is 8-10 meters long, assessing the dynamic sealing performance between the polished rod and the packing box is challenging. Current technologies only assess the static sealing performance, which cannot fully reflect the overall sealing performance of the polished rod and packing box, nor can they account for the impact of excessive polished rod roundness or the sealing structure on sealing performance.

[0003] Patent CN212180240U discloses a static and dynamic simulation test device for a smooth rod seal. It is mainly used to simulate the static and dynamic sealing performance and the service life of the tapered packing rubber seal during the research and development and manufacturing of smooth rod seals in the factory. However, it can only be tested under normal pressure and cannot achieve dynamic pressure testing. Summary of the Invention

[0004] To address the aforementioned problems, the present invention aims to provide a dynamic sealing pressure testing device and method for a smooth rod. This device uses a power source to provide linear motion to simulate the movement of the smooth rod, thereby testing and verifying the influence of smooth rods of different shapes and packing box structures on sealing performance under pressure conditions.

[0005] The technical solution of the present invention is as follows: a dynamic sealing pressure testing device for a smooth rod, comprising a smooth rod, two packing boxes, and a control console. A four-way valve is provided between the two packing boxes. The smooth rod passes through the packing boxes and is connected to a power source via the four-way valve. The smooth rod forms a seal at the packing boxes. A pressure sensor is connected to one side of the four-way valve, and the pressure sensor is connected to a pressure monitoring recorder. An energy storage bottle is sealed and connected to the other side of the four-way valve. The energy storage bottle is connected to a pressure pump via a high-pressure pipeline. The control console is electrically connected to both the pressure pump and the power source.

[0006] A pressure gauge is also provided on the side of the four-way connector that is connected to the pressure sensor.

[0007] Limiters are provided at the designed travel points at both ends of the optical rod, and the limiters are electrically connected to the control console.

[0008] The power source includes a compressed air station and a cylinder. The compressed air station drives the cylinder to drive the guide rod to perform reciprocating linear motion.

[0009] The power source includes a hydraulic station and a hydraulic cylinder. The hydraulic station drives the hydraulic cylinder to drive the guide rod to perform reciprocating linear motion.

[0010] The power source includes a motor, a reducer, a crank, a connecting rod, and a slider. The motor drives the reducer, crank, connecting rod, and slider to drive the guide rod to perform reciprocating linear motion.

[0011] A method for dynamic sealing pressure testing of a polished rod, using a dynamic sealing pressure testing device for a polished rod as described above, includes the following steps: S1: Connect the pressurizing pump to the energy storage bottle via a high-pressure pipeline in a sealed manner. The energy storage bottle is connected to the four-way valve in a sealed manner to transmit the pressure to the seal between the polished rod and the packing box. The pressure range is 1.6MPa~25MPa. S2: Start the power source to drive the light rod to reciprocate linearly. The light rod passes through the packing box and the four-way valve, and forms a seal at the packing box. The stroke of the light rod is controlled by limiters set at both ends. The limiter signals are transmitted to the control console. The electrical components of the control console are activated to control the light rod to change direction. The light rod reciprocates to test the dynamic sealing pressure. S3: The pressure sensor is connected to the four-way connector via a thread, and transmits the monitored pressure changes as signals to the pressure monitoring recorder. The pressure monitoring recorder receives the pressure sensor signals and converts them into pressure values. Through pressure monitoring and recording, the sealing performance of the guide rod and packing box can be determined, and the influence of the guide rod shape and packing box sealing structure on the sealing performance can be analyzed.

[0012] The technical advantages of this invention are as follows: 1. This invention uses a power source to provide linear motion to simulate the movement of the guide rod, thereby testing and verifying the influence of different shapes of guide rods and packing box structures on sealing performance; 2. The pressurization pump of this invention is connected to the energy storage bottle via a high-pressure pipeline, and the energy storage bottle is connected to the four-way seal, transmitting pressure to the sealing point between the guide rod and the packing box, solving the problem of small sealing pressure chamber and sensitivity to pressure leakage changes between the guide rod and the packing box; 3. This invention achieves dynamic pressure testing between the guide rod and the packing box under pressurization, solving the problem that previous methods only tested static sealing performance and could not truly reflect dynamic sealing conditions, leading to qualified static sealing performance tests but leakage in actual use. This invention achieves the goal of completing dynamic sealing performance testing before the product leaves the factory, avoiding leakage in actual use. It also facilitates research on sealing mechanisms, provides experimental data for determining the technical parameters of the guide rod, and allows for targeted improvements to the experimental product through dynamic sealing testing, improving product reliability, reducing leakage during use, and preventing environmental pollution incidents.

[0013] The following will provide further explanation in conjunction with the accompanying drawings. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a dynamic sealing pressure testing device for a smooth rod according to an embodiment of the present invention.

[0015] Figure 2 This is a schematic diagram of the structure of the magnetic induction sensor according to an embodiment of the present invention. Attached reference numerals: 1-Smooth rod; 2-Packing box; 3-Four-way valve; 4-Storage bottle; 5-Pressure pump; 6-Pressure gauge; 7-Pressure sensor; 8-Pressure monitoring recorder; 9-Power source; 10-Limit switch; 11-Control console. Detailed Implementation Example 1

[0016] like Figure 1 As shown, a dynamic sealing pressure testing device for a smooth rod includes a smooth rod 1, two packing boxes 2, and a control console 11. A four-way connector 3 is provided between the two packing boxes 2. The smooth rod 1 passes through the packing boxes 2 and the four-way connector 3 and is connected to a power source 9. The smooth rod 1 forms a seal at the packing boxes 2. A pressure sensor 7 is connected to one side of the four-way connector 3. The pressure sensor 7 is connected to a pressure monitoring recorder 8. An energy storage bottle 4 is sealed to the other side of the four-way connector 3. The energy storage bottle 4 is connected to a pressure pump 5 through a high-pressure pipeline. The control console 11 is electrically connected to the pressure pump 5 and the power source 9 respectively.

[0017] In actual use, the present invention starts the power source 9 to drive the guide rod 1 to reciprocate linearly. The guide rod 1 passes through the packing box 2 and the four-way connector 3, and forms a seal at the packing box 2. The electrical components of the control console 11 are activated to control the guide rod 1 to change direction. The guide rod 1 reciprocates to test the dynamic sealing pressure. The pressure sensor 7 is connected to the four-way connector 3 through a thread and transmits the monitored pressure changes as a signal to the pressure monitoring recorder 8. The pressure monitoring recorder 8 receives the signal from the pressure sensor 7 and converts it into a pressure value. Through pressure monitoring and recording, the sealing performance of the guide rod 1 and the packing box 2 can be judged. The influence of the shape of the guide rod 1 and the sealing structure of the packing box 2 on the sealing performance can be analyzed. This invention employs a power source to provide linear motion to simulate the movement of a guide rod, testing the impact of different guide rod shapes and packing box structures on sealing performance. The pressurization pump is connected to a sealed energy storage bottle via a high-pressure pipeline, and the energy storage bottle is connected to a four-way seal, transmitting pressure to the seal between the guide rod and the packing box. This solves the problem of small pressure chambers and sensitivity to pressure leakage changes in the seal between the guide rod and the packing box. Under pressurization, this invention achieves dynamic pressure testing between the guide rod and the packing box, addressing the previous method of only testing static sealing performance, which could not accurately reflect dynamic sealing conditions. This resulted in static sealing performance tests being passed, but leaks occurring during actual use. This invention achieves the goal of completing dynamic sealing performance testing before product delivery, preventing leaks in actual use. It also facilitates research on sealing mechanisms, provides experimental data for determining guide rod technical parameters, and allows for targeted improvements to the experimental product through dynamic sealing testing, enhancing product reliability, reducing leaks during use, and preventing environmental pollution incidents. Example 2

[0018] Preferably, based on Embodiment 1, in this embodiment, the side of the four-way valve 3 connected to the pressure sensor 7 is also provided with a pressure gauge 6.

[0019] In actual use, the side of the four-way valve 3 connected to the pressure sensor 7 is also equipped with a pressure gauge 6, which can display the test pressure in real time. Example 3

[0020] Preferably, based on Embodiment 1 or Embodiment 2, in this embodiment, limiters 10 are provided at the designed stroke of both ends of the light rod 1, and the limiters 10 are electrically connected to the control console 11.

[0021] In practical use, limiters 10 are installed at both ends of the designed travel of the optical rod 1. These limiters 10 are electrically connected to the control console 11. The travel of the optical rod is controlled by the limiters at both ends. Signals from the limiters are transmitted to the control console, causing the electrical components of the control console to activate and control the optical rod to reverse direction, achieving reciprocating linear motion. Each limiter includes two magnetic induction sensors and one magnetic ring. The magnetic ring is positioned within the travel range of the optical rod. When the magnetic ring reaches a magnetic induction sensor, the sensor sends a signal to reverse direction. The distance between the two limiters is equal to the travel of the optical rod. Figure 2 As shown, the magnetic induction sensor consists of two alloy springs with high magnetic permeability and low coercivity, sealed in a glass tube filled with inert gas. The two springs maintain a certain overlap and appropriate gap, with gold-plated ends serving as contacts, and a fuse welded to the outside of the tube. When the magnetic field strength at the sensor's location is sufficiently high, the two springs attract each other, causing the contacts to conduct; when the magnetic field weakens to a certain level, it is released by the spring's own elasticity. This prevents the magnetic ring from contacting the limit switch. When the magnetic ring travels to one side of the sensor's position, the springs engage with the contacts, connecting the circuit and outputting a reversing signal; the magnetic ring moves in the opposite direction, reaching the other side's sensor position, where the springs engage with the contacts, connecting the circuit again and outputting a reversing signal, repeating this process to ensure continuous reciprocating motion of the guide rod. Simultaneously, the magnetic induction sensor has an indicator light that illuminates during reversal. Example 4

[0022] Preferably, based on Embodiment 1 or Embodiment 3, in this embodiment, the power source 9 includes a compressed air station and a cylinder, and the compressed air station drives the cylinder to drive the light rod 1 to perform reciprocating linear motion.

[0023] In actual use, the power source 9 of the present invention includes a compressed air station and a cylinder. The compressed air station drives the cylinder to supply reciprocating linear motion, and the cylinder is connected to the light rod to drive the light rod 1 to perform reciprocating linear motion. Example 5

[0024] Preferably, based on Embodiment 1 or Embodiment 4, in this embodiment, the power source 9 includes a hydraulic station and a hydraulic cylinder, and the hydraulic station drives the hydraulic cylinder to drive the light rod 1 to perform reciprocating linear motion.

[0025] In actual use, the power source 9 of the present invention includes a hydraulic station and a hydraulic cylinder. The hydraulic station drives the hydraulic cylinder to supply reciprocating linear motion, and the hydraulic cylinder connects to the guide rod, thereby driving the guide rod 1 to perform reciprocating linear motion. Example 6

[0026] Preferably, based on Embodiment 1 or Embodiment 4, in this embodiment, the power source 9 includes a motor, a reducer, a crank, a connecting rod, and a slider. The motor drives the reducer, crank, connecting rod, and slider to drive the light rod 1 to perform reciprocating linear motion.

[0027] In actual use, the power source 9 of the present invention includes a motor, a reducer, a crank, a connecting rod, and a slider. The motor drives the reducer, crank, connecting rod, and slider to supply reciprocating linear motion. The slider connects to the optical rod and drives the optical rod 1 to perform reciprocating linear motion. Example 7

[0028] A method for dynamic sealing pressure testing of a polished rod, using a dynamic sealing pressure testing device for a polished rod as described above, includes the following steps: S1: The pressurizing pump 5 is connected to the energy storage bottle 4 in a sealed manner through a high-pressure pipeline. The energy storage bottle 4 is connected to the four-way valve 3 in a sealed manner, and the pressure is transmitted to the seal between the polished rod 1 and the packing box 2. The pressure range is 1.6MPa~25MPa. S2: Start the power source 9 to drive the light rod 1 to reciprocate linearly. The light rod 1 passes through the packing box 2 and the four-way valve 3 and forms a seal at the packing box 2. The stroke of the light rod 1 is controlled by the limiters 10 set at both ends. The limiters 10 transmit signals to the control console 11. The electrical components of the control console 11 are activated to control the light rod 1 to change direction. The light rod 1 reciprocates to test the dynamic sealing pressure. S3: Pressure sensor 7 is connected to four-way connector 3 via a thread, and transmits the monitored pressure changes as signals to pressure monitoring recorder 8. Pressure monitoring recorder 8 receives the signals from pressure sensor 7 and converts them into pressure values. Through pressure monitoring and recording, the sealing performance of the smooth rod 1 and packing box 2 can be determined, and the influence of the shape of smooth rod 1 and the sealing structure of packing box 2 on sealing performance can be analyzed.

[0029] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A dynamic sealing pressure testing device for a smooth rod, characterized in that: The device includes a light rod (1), two packing boxes (2), and a control console (11). A four-way connector (3) is provided between the two packing boxes (2). The light rod (1) passes through the packing box (2) and the four-way connector (3) and is connected to the power source (9). The light rod (1) forms a seal at the packing box (2). A pressure sensor (7) is connected to one side of the four-way connector (3). The pressure sensor (7) is connected to a pressure monitoring recorder (8). An energy storage bottle (4) is sealed to the other side of the four-way connector (3). The energy storage bottle (4) is connected to a pressure pump (5) through a high-pressure pipeline. The control console (11) is electrically connected to the pressure pump (5) and the power source (9) respectively.

2. The dynamic sealing pressure testing device for a smooth rod according to claim 1, characterized in that: The side of the four-way valve (3) connected to the pressure sensor (7) is also equipped with a pressure gauge (6).

3. The dynamic sealing pressure testing device for a smooth rod according to claim 1, characterized in that: Limiters (10) are provided at the designed travel points at both ends of the light rod (1), and the limiters (10) are electrically connected to the control console (11).

4. The dynamic sealing pressure testing device for a smooth rod according to claim 1, characterized in that: The power source (9) includes a compressed air station and a cylinder. The compressed air station drives the cylinder to drive the light rod (1) to perform reciprocating linear motion.

5. The dynamic sealing pressure testing device for a smooth rod according to claim 1, characterized in that: The power source (9) includes a hydraulic station and a hydraulic cylinder. The hydraulic station drives the hydraulic cylinder to drive the light rod (1) to perform reciprocating linear motion.

6. The dynamic sealing pressure testing device for a smooth rod according to claim 1, characterized in that: The power source (9) includes a motor, a reducer, a crank, a connecting rod, and a slider. The motor drives the reducer, crank, connecting rod, and slider to drive the light rod (1) to perform reciprocating linear motion.

7. A method for dynamic sealing pressure testing of a polished rod, using the dynamic sealing pressure testing device for a polished rod as described in claim 1, characterized in that: Includes the following steps: S1: Connect the pressurizing pump (5) to the energy storage bottle (4) via a high-pressure pipeline in a sealed manner. Connect the energy storage bottle (4) to the four-way valve (3) in a sealed manner. Transfer the pressure to the seal between the polished rod (1) and the packing box (2). The pressure range is 1.6MPa~25MPa. S2: Start the power source (9) to drive the light rod (1) to make reciprocating linear motion. The light rod (1) passes through the packing box (2) and the four-way valve (3) and forms a seal at the packing box (2). The stroke of the light rod (1) is controlled by the limiters (10) set at both ends. The limiter (10) transmits the signal to the control console (11). The electrical components of the control console (11) are activated to control the light rod (1) to change direction. The light rod (1) runs back and forth to test the dynamic sealing pressure. S3: The pressure sensor (7) is connected to the four-way connector (3) through a thread, and transmits the monitored pressure change as a signal to the pressure monitoring recorder (8). The pressure monitoring recorder (8) receives the signal from the pressure sensor (7) and converts it into a pressure value. Through pressure monitoring and recording, the sealing performance of the smooth rod (1) and the packing box (2) can be judged. The influence of the shape of the smooth rod (1) and the sealing structure of the packing box (2) on the sealing performance can be analyzed.

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