Gas-liquid top pressure cylinder for sealing and compensating sucker rod packing

Abstract

The utility model belongs to the field of oil exploitation equipment, especially relates to a gas -liquid top pressure cylinder for pumping rod packing seal compensation. Including the gas -liquid top pressure cylinder body for being used for the casing in pumping rod, the gas -liquid top pressure cylinder body includes the piston pipe for casing in pumping rod outside and the cylinder sleeve of casing in the piston pipe outside, the piston pipe is provided through the cylinder sleeve, still be provided with the piston cover on the piston pipe, the piston cover sets up between the piston pipe and the cylinder sleeve, the piston cover divides the cylinder sleeve into the compensation cavity and reset cavity of upper and lower settings, be provided with sealed liquid medium in the compensation cavity, be provided with the air inlet hole and the air outlet hole on the cylinder sleeve, the air inlet hole and the air outlet hole communicate with the compensation cavity setting. The utility model improves the structure of the existing hydraulic pressure, utilizes the compensation cavity to realize the movement of the piston pipe, and utilizes the sealed liquid medium to realize the sealing of the compensation cavity, thereby avoiding the stability of gas pressure, and ensuring the load demand.

Description

Technical Field

[0001] This utility model belongs to the field of oil extraction equipment, and in particular relates to a gas-liquid top pressure cylinder for compensating sucker rod packing seals. Background Technology

[0002] The sucker rod is a slender rod in an oil well. It connects the oil pump to the pumping unit and moves up and down in the well to transmit power.

[0003] The seal between the sucker rod and the wellhead is a packing seal. The packing seal ring will wear down with the up-and-down reciprocating motion of the sucker rod. When the packing seal ring wears down and the seal is not tight, the workers need to manually pressurize and tighten the packing seal ring, which increases the labor intensity of the workers. If the maintenance and pressurization are not done in time, it will affect the sealing of the packing seal ring on the sucker rod, resulting in pressure imbalance and oil leakage, which will greatly affect the oil pumping efficiency and oil pumping effect.

[0004] To address the aforementioned technical issues, there are currently two main directions for improving the structure of sucker rod packing seals: One approach is to press a compression spring onto the packing seal ring to apply elastic pressure and tighten it. When the packing seal ring wears and becomes loose, the spring force is used to apply real-time pressure and tighten it. However, in actual use, the compression spring gradually elongates, and the elastic force gradually weakens, resulting in poor real-time pressure and tightening effect on the packing seal ring. The other approach is to press a hydraulic cylinder onto the packing seal ring, using the movement of the cylinder's piston rod to apply real-time pressure and tighten the packing seal ring. While this method solves the problem of lost elastic force, the hydraulic cylinder requires a hydraulic pump station to provide pressure, resulting in high operating costs. Furthermore, repeated start-stop cycles can easily damage the hydraulic pump station, further increasing operating costs. Utility Model Content

[0005] This utility model addresses the technical problems existing in the current sucker rod packing seal by proposing a gas-liquid top pressure cylinder for compensating sucker rod packing seals that is reasonably designed, simple in structure, easy to process, and safe and reliable in use.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: This utility model provides a gas-liquid top-pressure cylinder for compensating the packing seal of a sucker rod, including a gas-liquid top-pressure cylinder body for mounting on a sucker rod. The gas-liquid top-pressure cylinder body includes a piston tube for mounting outside the sucker rod and a cylinder sleeve for mounting outside the piston tube. The piston tube passes through the cylinder sleeve, and a piston sleeve is also provided on the piston tube. The piston sleeve is located between the piston tube and the cylinder sleeve, and the piston sleeve divides the cylinder sleeve into a compensation chamber and a reset chamber arranged vertically. A sealing liquid medium is provided in the compensation chamber. An air inlet and an air outlet are provided on the cylinder sleeve, and the air inlet and air outlet are connected to the compensation chamber.

[0007] Preferably, the compensation cavity is filled with nitrogen gas.

[0008] Preferably, the air inlet is connected to an inflation valve.

[0009] Preferably, the vent is connected to a pressure gauge.

[0010] Preferably, a return spring is also fitted onto the piston tube, and the return spring is disposed inside the return cavity.

[0011] Compared with the prior art, the advantages and positive effects of this utility model are as follows: This utility model provides a gas-hydraulic top pressure cylinder for compensating the packing seal of a sucker rod. By improving the existing hydraulic pressurization structure, the piston tube is moved using the compensation chamber, while the sealing liquid medium is used to seal the compensation chamber, thereby avoiding the instability of gas pressure and ensuring the load requirements. In addition, the pressure is mainly adjusted by gas, further reducing the implementation cost. Attached Figure Description

[0012] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the gas-liquid top pressure cylinder for compensating sucker rod packing seals provided in Example 1; In the above figures, 1 is the cylinder liner; 11 is the reset chamber; 12 is the compensation chamber; 121 is the sealing liquid medium; 13 is the air inlet; 14 is the air outlet; 2 is the piston tube; 21 is the piston sleeve; 3 is the reset spring; 4 is the sucker rod; 5 is the packing sleeve; 51 is the packing. Detailed Implementation

[0014] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0015] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0016] Example 1, as Figure 1 As shown, this embodiment aims to solve the technical problems of failure and high cost of existing packing pressure sealing structures on sucker rods. To achieve the above objective, this embodiment provides a gas-hydraulic top-pressure cylinder for compensating sucker rod packing seals, including a gas-hydraulic top-pressure cylinder body for mounting on the sucker rod 4. Of course, a packing sleeve 5 is installed on the sucker rod 4, and a packing 51 is provided inside the packing sleeve 5. The packing is mounted on the sucker rod 4. In this embodiment, no improvements are involved to the sucker rod 4, the packing 51, or the packing sleeve 5. Therefore, they are not described in detail in this embodiment.

[0017] The gas-liquid top-pressure cylinder body provided in this embodiment includes a piston tube 2 for mounting outside the sucker rod 4 and a cylinder liner 1 for mounting outside the piston tube 2. The piston tube 2 is generally tubular, while the cylinder liner 1 is cylindrical. The piston tube 2 passes through the cylinder liner 1, that is, the top of the piston tube 2 extends out of the cylinder liner 1, and the bottom of the piston tube 2 can extend out of the cylinder liner 1. The bottom of the piston tube 2 forms contact with the packing 51 to apply pressure to the packing 51.

[0018] To control the movement of the piston tube 2 and facilitate pressure application to the packing 51, a piston sleeve 21 is provided on the piston tube 2. The piston sleeve 21 is located between the piston tube 2 and the cylinder liner 1. The piston sleeve 21 functions similarly to the piston head of an existing cylinder or hydraulic cylinder. Its outer ring is fitted with a sealing ring, thereby dividing the cylinder liner 1 into an upper and lower compensation chamber 12 and a reset chamber 11. The compensation chamber 12 is used to apply pressure, causing the piston tube 2 to move downward and press against the packing 51. The reset chamber 11 is used to reset the piston tube 2 after the compensation chamber 12 is depressurized, facilitating the replacement of the packing 51 or the entire pressurized cylinder.

[0019] To address the high cost of hydraulic sealing while ensuring load requirements, this embodiment fills the compensation chamber 12 with a sealing liquid medium 121, which can be hydraulic oil or other oil-based products. The sealing liquid medium 121 occupies only a portion of the compensation chamber space and, under gravity, automatically flows to the part of the compensation chamber 12 that contacts the piston sleeve 21. Simultaneously, an air inlet 13 and an air outlet 14 are provided on the cylinder liner 1, communicating with the compensation chamber 12. Thus, by filling the compensation chamber 12 with nitrogen, the pressure in the compensation chamber 12 pushes the sealing liquid medium 121 downwards, thereby pushing the piston sleeve 21 and causing the piston tube 2 to move downwards, thus applying pressure to the packing 51. The presence of the sealing liquid medium 121 satisfies the load requirements for pressurizing the piston sleeve 21 and also provides a seal for the nitrogen. Furthermore, since the nitrogen can be stored in a nitrogen tank, frequent equipment starts are avoided, thereby extending the equipment's service life.

[0020] To ensure the stability and accuracy of the air pressure in the compensation chamber 12, an inflation valve is connected to the air inlet 13, and the other end of the inflation valve is connected to a nitrogen generator or nitrogen tank to ensure real-time nitrogen input and sealing. A pressure gauge is connected to the air outlet 14 to ensure precise pressure readings. Of course, a valve is also connected to the other end of the pressure gauge to allow for pressure relief.

[0021] To save energy, in this embodiment, a return spring 3 is also installed on the piston tube 2, and the return spring 3 is located in the return cavity 1111. In this way, after depressurization, the piston rod can be moved in the reverse direction using the return spring 3, which facilitates the replacement of the packing 51 or the entire top pressure cylinder. Of course, a venting method can also be used, but considering that the implementation cost and processing cost are greater than installing the return spring 3, the use of the return spring 3 is preferred.

[0022] The above settings effectively prevent spring loss and high operating costs associated with hydraulic structures, thus significantly extending the service life of the pressure equipment.

[0023] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A pneumatic-hydraulic pressure cylinder for compensating sucker rod packing seals, characterized in that, The device includes a gas-hydraulic top-pressure cylinder body for mounting on a sucker rod. The gas-hydraulic top-pressure cylinder body includes a piston tube mounted outside the sucker rod and a cylinder sleeve mounted outside the piston tube. The piston tube passes through the cylinder sleeve, and a piston sleeve is also provided on the piston tube. The piston sleeve is located between the piston tube and the cylinder sleeve, and the piston sleeve divides the cylinder sleeve into a compensation chamber and a reset chamber, which are arranged vertically. A sealing liquid medium is provided in the compensation chamber. An air inlet and an air outlet are provided on the cylinder sleeve, and the air inlet and air outlet are connected to the compensation chamber.

2. The gas-hydraulic pressure cylinder for compensating sucker rod packing seals according to claim 1, characterized in that, The compensation chamber is filled with nitrogen gas.

3. The gas-hydraulic pressure cylinder for compensating sucker rod packing seals according to claim 2, characterized in that, The air inlet is connected to an air filling valve.

4. The gas-hydraulic pressure cylinder for compensating sucker rod packing seals according to claim 3, characterized in that, The vent is connected to a pressure gauge.

5. The gas-hydraulic pressure cylinder for compensating sucker rod packing seals according to any one of claims 1 to 4, characterized in that, A return spring is also fitted onto the piston tube, and the return spring is disposed inside the return cavity.

Images