Polish rod structure of oil pumping unit

Abstract

The utility model provides a polish rod structure of a pumping unit. The polish rod structure comprises a center rod, a sleeve and a connecting part. The center rod is sleeved with the sleeve, the sleeve is fixedly connected with the center rod through a connecting part, the center rod is cylindrical, and the sleeve is a cylinder with the axis coinciding with the axis of the center rod. The device has an automatic righting function, so that the problem of eccentric wear of the polish rod of the pumping unit is effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of oil extraction, in particular to a polished rod structure of a pumping unit. Background Art

[0002] In the process of oil extraction, a pumping unit is a commonly used oil production equipment. During the operation of the pumping unit, due to various factors, such as well deviation, elastic deformation of the sucker rod string, and imbalance of the pumping unit, it is not easy to align the polished rod of the existing beam pumping unit with the wellhead device exactly by 100% in the installation position.

[0003] Therefore, during the reciprocating motion of the polished rod of the pumping unit, the polished rod often causes eccentric wear, which affects the normal operation and service life of the packing of the pumping unit. The sealing of the wellhead packing fails, resulting in crude oil leakage and environmental pollution. In addition, the eccentric wear of the polished rod of the pumping unit may also cause the polished rod to contact the packing gland, resulting in rapid wear of the wear-resistant coating on the polished rod of the pumping unit. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a polished rod structure of a pumping unit, which has a certain deviation correction function, and thus effectively solves the problem of eccentric wear of the polished rod of the pumping unit.

[0005] To achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A polished rod structure of a pumping unit, comprising a central rod, a sleeve and a connecting component;

[0007] The sleeve is sleeved on the central rod and fixedly connected with the central rod through the connecting component; the central rod is cylindrical in shape, and the sleeve is a cylindrical body with its axis coinciding with the axis of the central rod.

[0008] Preferably, both ends of the sleeve in the axial direction respectively have a first port and a second port, the connecting component covers the first port and is fixedly connected with the sleeve, a connecting through hole is arranged on the connecting component, and the central rod passes through the connecting through hole and is fixedly connected to the connecting component.

[0009] Preferably, internal threads are arranged on the inner wall of the connecting through hole, and external threads matching the internal threads are arranged on the outer wall of the central rod, so that the central rod is connected in the connecting through hole by threads.

[0010] Preferably, the central rod is fixedly connected with the connecting component by welding.

[0011] Preferably, the connecting component and / or the sleeve are made of elastic materials.

[0012] The polished rod structure of the pumping unit of the present utility model adopts the technical solution of sleeving the central rod with the sleeve and fixedly connecting the sleeve to the central rod through the connecting component, which has a certain deviation correction function, thereby effectively solving the problem of eccentric wear of the polished rod of the pumping unit. Brief Description of the Drawings

[0013] Figure 1 Schematic diagram of the working state of an embodiment of the polished rod structure of the pumping unit of the present utility model.

[0014] In the figure: 1 - sealing component; 2 - central rod; 3 - sleeve; 4 - connecting component; 5 - accommodating hole; 6 - connecting through-hole; 8 - first port; 9 - second port; 10 - annular cavity. Detailed Description of the Specific Embodiment

[0015] In order to make the purpose, technical solution and advantages of the present utility model clearer, the polished rod structure of the pumping unit and the pumping unit of the present utility model will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0016] As Figure 1 shown, a polished rod structure of a pumping unit, wherein the pumping unit has a sealing component 1, including a central rod 2, a sleeve 3 and a connecting component 4. The sleeve 3 is sleeved on the central rod 2 and fixedly connected to the central rod 2 through the connecting component 4. During use, the central rod 2 is connected to a driving device (not shown in the figure) in the pumping unit. The sealing component 1 is an accommodating hole 5 (sealing packing) that matches the outer contour shape of the sleeve 3. The sleeve 3 is inserted into the accommodating hole 5, and the driving device drives the sleeve 3 to perform a linear reciprocating motion in the accommodating hole 5 through the central rod 2. It should be noted that the outer wall of the sleeve 3 and the accommodating hole 5 are in a sealed connection. Adopting such a technical solution, an annular cavity (10) with a circular cross-section is formed between the outer wall of the central rod 2 and the inner wall of the sleeve 3. When the pumping unit works, the polished rod structure makes a reciprocating motion. Since there is a certain gap (annular cavity (10)) between the central rod 2 and the sleeve 3, by using this gap, the central rod 2 absorbs the installation deviation of the pumping unit or the deviation generated by the arc-shaped walking beam, and the central rod 2 deforms, which can automatically correct the position of the sleeve 3 in the packing 5, overcome the wear caused by the position deviation between the pumping unit and the wellhead device, and extend the service life of the polished rod of the pumping unit and the sealing component (packing). In actual production, the sleeve 3 can be selected from other new wear-resistant material pipes besides steel.

[0017] Specifically, as Figure 1As shown, both axial ends of the sleeve 3 respectively have a first port 8 and a second port 9. The connecting member 4 (the outer profile of the connecting member 4 can be a cylindrical shape with an outer diameter the same as that of the sleeve) covers the first port 8 and is fixedly connected to the sleeve 3. In actual production, the connecting member 4 can be fixedly connected to the sleeve 3 by continuous welding, but it is not limited to this. Any technical solution that can achieve the purpose of the invention, such as integral molding, can also be adopted. Through the technical solution of covering the first port 8 with the connecting member 4, it can prevent oil from entering the annular space 10 between the sleeve 3 and the central rod 2 during actual operation.

[0018] Furthermore, as Figure 1 shown, a connecting through-hole 6 is provided on the connecting member 4, and the central rod 2 passes through the connecting through-hole 6 and is fixedly connected to the connecting member 4. By adopting such a technical solution, the part of the sleeve 3 except the first port 8 is in a radially separated state from the central rod 2. When the axial length of the sleeve 3 reaches a certain value, the part of the sleeve 3 that has a distance from the first port 8 in the axial direction can generate a relative radial displacement with respect to the central rod 2. In this way, when affected by some actual factors (such as well deviation, etc.), resulting in the inclination or deformation of the central rod, the sleeve 3 can adjust the relative radial position between itself and the central rod 2 (the adjustment of the relative radial position between the sleeve 3 and the central rod 2 here refers to the adjustment of the relative radial position between the part of the sleeve 3 that has a certain distance from the first port 8 in the axial direction and the central rod 2) through the limitation of the receiving hole 5 to ensure the straightness of its own running track, thereby preventing the phenomenon of eccentric wear between the sleeve 3 and the inner wall of the receiving hole 5. In actual production, the connecting member 4 and / or the sleeve 3 can be made of elastic materials. In this way, the relative radial position adjustment between the sleeve 3 and the central rod 2 can be realized through the elastic deformation generated by the connecting member 4 and / or the sleeve 3.

[0019] The connection between the central rod 2 and the connecting member 4 can also be achieved by providing internal threads on the inner wall of the connecting through-hole 6 and external threads matching the internal threads on the outer wall of the central rod 2, so that the central rod 2 is threadedly connected in the connecting through-hole 6. It should be noted that the connection between the central rod 2 and the connecting member 4 is not limited to threaded connection. Other methods such as fixedly connecting the central rod 2 to the connecting member 4 by welding can also be adopted.

[0020] The above-described embodiments only represent several implementation manners of the present utility model. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present utility model. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present utility model, several deformations and improvements can still be made, and these all belong to the protection scope of the present utility model. Therefore, the protection scope of the patent of the present utility model should be subject to the appended claims.

Claims

1. The polished rod structure of a pumping unit, characterized in that: It includes a central rod (2), a sleeve (3) and a connecting component (4); The sleeve (3) is sleeved on the central rod (2) and fixedly connected to the central rod (2) through the connecting component (4); The central rod (2) is cylindrical in shape, and the sleeve (3) is a cylindrical body with its axis coinciding with the axis of the central rod (2).

2. The polished rod structure of a pumping unit according to claim 1, characterized in that: Both ends of the sleeve (3) in the axial direction respectively have a first port (8) and a second port (9). The connecting component (4) covers the first port (8) and is fixedly connected to the sleeve (3). A connecting through hole (6) is provided on the connecting component (4), and the central rod (2) passes through the connecting through hole (6) and is fixedly connected to the connecting component (4).

3. The polished rod structure of a pumping unit according to claim 2, characterized in that: Internal threads are provided on the inner wall of the connecting through hole (6), and external threads matching the internal threads are provided on the outer wall of the central rod (2), so that the central rod (2) is connected in the connecting through hole (6) by threads.

4. The polished rod structure of a pumping unit according to claim 2, characterized in that: The central rod (2) is fixedly connected to the connecting component (4) by welding.

5. The polished rod structure of a pumping unit according to claim 2, characterized in that: The connecting component (4) and / or the sleeve (3) are made of elastic materials.

Images