Packing box for intelligently sealing polish rod of oil pumping unit

Abstract

The packing box comprises a box body, packing, a gland and the polish rod, the packing is installed in the box body, the gland can be arranged at one end of the box body in a sleeved mode and is connected with or makes contact with one end of the packing in an abutting mode, and one end of the polish rod can be inserted into the box body in an axial moving mode and penetrates through the gland and the packing. The device further comprises a pressure sensor, an elastic piece and a drive control assembly, the pressure sensor is arranged at the other end of the packing to detect pressure information, and the elastic piece is arranged between the other end of the packing and the pressure sensor. The drive control assembly is connected with the gland to control the gland to act to extrude the packing to deform according to the pressure information. The rubber packing compression device can solve the problems that rubber packing compression is not quantitative, and operators need to conduct tour inspection and screwing operation frequently, and the purposes of improving the packing box sealing rate and improving the oil pumping unit system efficiency are achieved.

Description

Technical Field

[0001] This utility model relates to the field of oil extraction technology, and in particular to a packing box for intelligent sealing of the polished rod of an oil pumping unit. Background Technology

[0002] A packing box is a dynamic sealing device installed at the wellhead to seal the annular space between the tubing and the polished rod. When the polished rod moves up and down under the drive of the surface pumping equipment, the sealing function of the packing box prevents crude oil from leaking out.

[0003] The working principle of a typical packing box is as follows: tightening the cap compresses the annular rubber packing inside the box cavity, deforming it and gripping the smooth rod to achieve a seal. The main drawbacks are as follows: First, there is no precise measurement of the rubber packing compression; it relies on the operator's experience. If the cap is tightened too loosely, the rubber packing will not compress sufficiently, leading to a poor seal between the packing and the smooth rod and potential leakage. If the cap is tightened too tightly, the rubber packing will be over-compressed, resulting in excessive friction between the packing and the lever, increasing energy consumption and reducing system efficiency. Second, the workload is relatively high. The relative movement and friction between the smooth rod and the packing cause wear on the rubber packing, requiring the operator to periodically tighten the cap, with no fixed interval, further increasing the workload. Utility Model Content

[0004] This utility model provides a packing box for intelligent sealing of the polished rod of an oil pumping unit, which solves the problems of indefinite compression of rubber packing and the need for operators to frequently conduct inspections and tightening operations, thereby improving the sealing rate of the packing box and increasing the efficiency of the oil pumping unit system.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a packing box for intelligent sealing of the polished rod of an oil pumping unit, comprising a box body, packing, a pressure cap, and a polished rod. The packing is installed in the box body. The pressure cap can be sleeved on one end of the box body and connected to or in contact with one end of the packing. One end of the polished rod can be axially moved into the box body and passes through the pressure cap and the packing. The invention is characterized by further including a pressure sensor, an elastic element, and a drive control assembly. The pressure sensor is disposed at the other end of the packing to detect pressure information. The elastic element is disposed between the other end of the packing and the pressure sensor. The drive control assembly is connected to the pressure cap to control the pressure cap to move and deform the packing according to the pressure information.

[0006] Furthermore, it also includes a detection switch, which is installed on the end of the housing near the pressure cap to emit a trigger signal when touched by the pressure cap. The drive control component is connected to the detection switch to send a reminder message and stop controlling the pressure cap action when the trigger signal is received.

[0007] Furthermore, it also includes a pressure ring, which is disposed on the inner side of the pressure cap opposite to one end of the packing, and the pressure ring abuts against one end of the packing.

[0008] Furthermore, the drive control component includes a controller, a transmission gear, and a drive motor. The controller, the drive motor, and the pressure sensor are electrically connected. The output end of the drive motor drives the transmission gear to rotate. The transmission gear is connected to and drives the pressure cap to rotate to generate axial displacement.

[0009] Furthermore, the controller is mounted on the drive motor, or the controller and the drive motor are respectively mounted on a fixed bracket, which is connected to the outside of the housing.

[0010] Furthermore, the housing is provided with a receiving cavity, and the packing, the elastic element and the pressure sensor are located in the receiving cavity and distributed along the axial direction.

[0011] Furthermore, the pressure sensor end of the receiving cavity is provided with a mounting boss; it also includes a bottom retaining ring, which is mounted on the mounting boss and located at the bottom of the pressure sensor.

[0012] Furthermore, it also includes a well sealer and a coupling, with the other end of the polished rod passing through the well sealer, and the coupling being connected and sealed to the top of the well sealer and the other end of the housing via threads.

[0013] Furthermore, the number of packing roots is multiple, and the multiple packing roots are axially distributed to form a packing root group.

[0014] Furthermore, the packing material is rubber.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. In this utility model, one end of the smooth rod can be axially moved and inserted into the box body and pass through the pressure cap and packing. The pressure cap can be sleeved on one end of the box body and connected to or in contact with one end of the packing. The pressure sensor is set at the other end of the packing to detect pressure information. The elastic element is set between the other end of the packing and the pressure sensor. The drive control component is connected to the pressure cap to control the action of the pressure cap according to the pressure information to compress the packing and deform it. This solves the problems of no quantitative compression of the packing and the need for operators to frequently conduct inspections and tightening operations, thereby improving the sealing rate of the packing box and improving the efficiency of the pumping unit system.

[0017] 2. In this utility model, the detection switch is installed on the end of the housing near the pressure cap to send a trigger signal when the pressure cap touches it. The drive control component is connected to the detection switch to send a reminder message when the trigger signal is received, so as to remind the packing to be replaced and to stop the control of the pressure cap to prevent damage to the system.

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, the packing box for intelligent sealing of the polished rod of an oil pumping unit according to the present invention is not limited to the embodiments. Attached Figure Description

[0019] Figure 1 This is a partial sectional view of the present invention;

[0020] Figure 2 This is the front view of this utility model;

[0021] Figure 3 This is a perspective view of the present invention;

[0022] In the picture:

[0023] 1. Smooth rod; 2. Pressure cap; 3. Drive gear; 4. Drive motor; 5. Controller; 6. Detection switch wiring;

[0024] 7. Pressure sensor wiring; 8. Coupling; 9. Well sealer; 10. Housing; 11. Fixing bracket; 12. Detection

[0025] 13. Switch; 14. Driven gear; 15. Bottom retaining ring; 16. Pressure sensor; 17. Elastic element; 18. Packing packing assembly;

[0026] 18. Pressure ring. Detailed Implementation

[0027] In this utility model, the use of terms such as "upper," "lower," "inner," "outer," and "top / bottom" to indicate orientation or positional relationships is based on the orientation or positional relationships shown in the accompanying drawings and is only for the convenience of describing this utility model. It does not indicate or imply that the device referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0028] Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" refers to two or more. In the description of this utility model, unless otherwise explicitly specified and limited, terms such as "installed," "equipped with," "sleeved / connected," and "connected" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] Please see Figures 1-3 As shown, this utility model discloses a packing box for intelligent sealing of the polished rod of an oil pumping unit, comprising a box body 10, packing, a pressure cap 2, and a polished rod 1. The box body 10 has a receiving cavity. The packing is made of rubber, and there are multiple packings arranged axially to form a packing group 17, which is installed in the receiving cavity of the box body 10. The pressure cap 2 is sleeved on one end of the box body 10 and connected to one end of the packing group 17 via a pressure ring 18. Specifically, the pressure cap 2 and the box body 10 are connected by threads. The pressure ring 18 is located on the inner side of the pressure cap 2 opposite to one end of the packing group 17 and abuts against one end of the packing group 17. One end of the polished rod 1 is axially movable and inserted into the box body 10, passing through the pressure cap 2 and the packing group 17. This utility model also includes a well sealer 9 and a coupling 8. The other end of the polished rod 1 passes through the well sealer 9, and the coupling 8 is connected and sealed to the top of the well sealer 9 and the other end of the box body 10 via threads.

[0030] This utility model also includes a pressure sensor 15, an elastic element 16, a drive control assembly, and a detection switch 12. In this embodiment, the drive control assembly includes a controller 5, a transmission gear, and a drive motor 4. The transmission gear includes a driving gear 3 and a driven gear 13. Specifically, the pressure sensor 15 is disposed at the other end of the packing assembly 17 to detect pressure information, and the elastic element 16 is disposed between the other end of the packing assembly 17 and the pressure sensor 15. In this embodiment, the elastic element 16 adopts a spring accumulator with a sensitive response and simple structure, but is not limited to this. The transmission gear and drive motor 4 in the drive control assembly are connected to the pressure cover 2. Specifically, the passive gear 13 is welded to the pressure cover 2, but not limited to this, to control the action of the pressure cover 2 according to the pressure information to compress and deform the packing assembly 17, so that the deformed packing assembly 17 hugs the light rod 1 to perform a sealing function. The detection switch 12 is installed on the end of the housing 10 near the pressure cover 2 to send a trigger signal when it is touched by the pressure cover 2. The controller 5 in the drive control assembly is connected to the detection switch 12. Specifically, the controller 5 can use the chip model TK8610, but is not limited to this. The detection switch 12 is connected to the drive control assembly through the detection switch connection 6 to send a reminder message when it receives the trigger signal, reminding the operator to replace the packing assembly 17 and stop controlling the action of the pressure cover 2 to prevent damage to the system. The controller 5, drive motor 4, and pressure sensor 15 are electrically connected. Specifically, the pressure sensor 15 is connected to the controller 5 via a pressure sensor connection line 7. The output of the drive motor 4 drives the driving gear 3 in the transmission gear to rotate forward or backward. The driving gear 3 meshes with the driven gear 13 in the transmission gear. The driven gear 13 connects to and drives the pressure cover 2 to rotate, generating axial displacement. Correspondingly, the pressure cover 2 can move up and down axially. The controller 5 is connected to and mounted on the drive motor 4. The drive motor 4 is mounted on a fixed bracket 11, which is connected to the housing 10. In addition, the controller 5 can be connected to a handheld terminal or a remote control center for convenient remote control.

[0031] In this invention, the packing assembly 17, the spring accumulator, and the pressure sensor 15 are located in the receiving cavity of the packing box and are distributed along the axial direction. The end of the receiving cavity where the pressure sensor 15 is located is also provided with a mounting boss. This invention also includes a bottom retaining ring 14, which is mounted on the mounting boss and located at the bottom of the pressure sensor 15.

[0032] Working Principle: Before normal operation, assemble the relevant components according to the attached diagram, ensuring that the pressure cap 2 is tightened and has sufficient room for movement. Power on the system and connect to the controller 5 via a handheld terminal or remote control center to set the maximum and minimum pressure control values. Start the pumping unit for normal production. During the operation of the pumping unit, the polished rod 1 moves up and down, rubbing against the rubber packing assembly 17. The rubber packing assembly 17 gradually wears down, and the pressure inside the housing 10 gradually decreases. When the pressure value is lower than the set minimum pressure control value, the controller 5 starts the drive motor 4. The drive motor 4 rotates the active gear 3, which drives the passive gear 13 to rotate the pressure cap 2, compressing the rubber packing assembly 17 and deforming it, thereby preventing well fluid leakage. When the pressure value inside the housing 10 is greater than the set maximum pressure control value, the drive motor 4 stops rotating under the control of the controller 5, thus maintaining a reasonable pressure range inside the housing 10. After prolonged operation, the rubber packing assembly 17 gradually wears down. When the gland 2 rotates to its compression limit, the gland 2 presses against the detection switch 12, generating a signal that is transmitted to the controller 5. The controller 5 then generates an alarm message and transmits it to the handheld terminal and the remote data center, reminding the operator to replace the rubber packing assembly 17 in a timely manner. At the same time, the controller 5 stops sending a signal to the drive motor 4 to continue rotating and pressurizing the gland 2, preventing damage to the system. When the rubber packing assembly 17 needs to be replaced, first stop the pumping unit and then close the wellhead sealer 9. Use the handheld terminal to control the drive motor 4 to reverse, which will allow you to remove the gland 2 and the driven gear 13. Disconnect the power to the intelligent housing 10 system, remove the rubber packing assembly 17 for replacement, initially tighten the gland 2 and the driven gear 13, and then power on the intelligent housing 10 system. The controller 5 automatically controls the drive motor 4 to apply the set pressure to the housing 10, opens the wellhead sealer 9, and starts the pumping unit to complete the packing replacement.

[0033] This invention utilizes a pressure sensor 15 to monitor the pressure of the rubber packing assembly 17 within the housing 10 in real time, and automatically controls the pressure cap 2 to tighten the packing assembly 17. This enables timely tightening of the packing assembly 17 without requiring manual tightening of the pressure cap 2 after machine shutdown, ensuring oil well production and reducing labor costs. Simultaneously, the pressure of the pressure cap 2 on the packing assembly 17 is maintained within a set range, preventing leakage due to insufficient pressure and reducing system efficiency due to excessive pressure. This invention can automatically control the tightening of the packing assembly 17 and transmit data to a remote data center in real time for packing assembly 17 replacement. It also enables semi-automatic control of the opening and tightening of the pressure cap 2, significantly reducing the workload of operators.

[0034] The packing box for intelligent sealing of the polished rod of an oil pumping unit according to this utility model is identical to or can be implemented using existing technologies for the parts not described herein.

[0035] The above embodiments are only used to further illustrate the packing box for intelligent sealing of the polished rod of an oil pumping unit according to the present invention. However, the present invention is not limited to the embodiments. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A packing box for intelligent sealing of a polished rod in an oil pumping unit, comprising a box body, packing, a pressure cap, and a polished rod, wherein the packing is installed in the box body, the pressure cap is sleeved on one end of the box body and connected to or in contact with one end of the packing, and one end of the polished rod is axially movable and inserted into the box body, passing through the pressure cap and the packing, characterized in that: It also includes a pressure sensor, an elastic element, and a drive control assembly. The pressure sensor is disposed at the other end of the packing to detect pressure information, and the elastic element is disposed between the other end of the packing and the pressure sensor. The drive control assembly is connected to the gland to control the gland to move and deform the packing according to the pressure information.

2. The packing box according to claim 1, characterized in that: It also includes a detection switch, which is installed on the end of the housing near the pressure cap to generate a trigger signal when touched by the pressure cap. The drive control component is connected to the detection switch to send a reminder message and stop controlling the pressure cap action when the trigger signal is received.

3. The packing box according to claim 1, characterized in that: It also includes a pressure ring, which is disposed on the inner side of the pressure cap opposite to one end of the packing, and the pressure ring abuts against one end of the packing.

4. The packing box according to claim 1, characterized in that: The drive control component includes a controller, a transmission gear, and a drive motor. The controller, the drive motor, and the pressure sensor are electrically connected. The output end of the drive motor drives the transmission gear to rotate. The transmission gear is connected to and drives the pressure cap to rotate to generate axial displacement.

5. The packing box according to claim 4, characterized in that: The controller is mounted on the drive motor, or the controller and the drive motor are respectively mounted on a fixed bracket, which is connected to the outside of the housing.

6. The packing box according to claim 1, characterized in that: The housing is provided with a receiving cavity, and the packing, the elastic element and the pressure sensor are located in the receiving cavity and distributed along the axial direction.

7. The packing box according to claim 6, characterized in that: The pressure sensor end of the accommodating cavity is also provided with a mounting boss; it also includes a bottom retaining ring, which is mounted on the mounting boss and located at the bottom of the pressure sensor.

8. The packing box according to claim 1, characterized in that: It also includes a well sealer and a coupling, with the other end of the polished rod passing through the well sealer, and the coupling being connected and sealed to the top of the well sealer and the other end of the housing by threads.

9. The packing box according to claim 1, characterized in that: The number of packing roots is multiple, and the multiple packing roots are axially distributed to form a packing root group.

10. The packing box according to claim 1 or 9, characterized in that: The packing material is rubber.

Images