Polish rod centralizer of rod-pumped well

Abstract

The utility model discloses a rod-pumped well polish rod centralizer, and relates to the technical field of oil pumping units, in particular to the rod-pumped well polish rod centralizer which is fixedly installed on an oil pumping unit rack, used for centralizing a polish rod of an oil pumping unit and comprises a barrel, the barrel is arranged outside the polish rod in a sleeved mode, and a certain distance exists between the inner wall of the barrel and the polish rod. The barrel body is fixedly installed on the pumping unit rack, the barrel body surrounds the polish rod, a certain distance exists between the barrel body and the polish rod, a plurality of righting assemblies on the barrel body are used for abutting against and limiting a plurality of portions of the outer side wall of the polish rod, the whole polish rod is located in the center of the barrel body, and therefore the polish rod is righting. According to the centering assembly, the multiple rolling balls make contact with the outer side wall of the polish rod, one point of the spherical surface of each rolling ball makes contact with the outer wall of the polish rod, and compared with the prior art, the direct contact area of the centering device and the polish rod is reduced, so that the friction force between the centering device and the polish rod is reduced, abrasion to the polish rod is greatly reduced, and the service life of the polish rod is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of oil pumping units, in particular to a polished rod centralizer for an oil pumping well. Background Art

[0002] During on-site construction such as oilfield well repair operations, dynamometer test, and pumping unit parameter adjustment, the "hair braid" is suspended on a rope hanger. A cover plate is fixed to the side of the rope hanger by bolts to prevent the bare rod from falling off. When the rope hanger is subjected to the upward pulling force of the "hair braid", due to the structure of the rope hanger itself, it is easy to cause the upper part of the rope hanger to tilt, causing the bare rod to deviate along the tangent direction of the donkey head, causing the bare rod to bend and twist, or even break and become scrapped. The emergence of the above problems not only delays the start of the pumping unit, but also increases the consumption of materials. In order to achieve the purpose of straightening, the operator has to use methods such as pushing the rope hanger or using wooden sticks to adjust the alignment between the bare rod and the donkey head. This not only violates the relevant operating procedures, is time-consuming and labor-intensive, and has low work efficiency, but also may cause major safety accidents.

[0003] In the published Chinese patent application, the publication number is: CN219974438U, and the patent name is: A pumping unit rod straightener, including two straightening mechanisms and a connecting seat connecting the two straightening mechanisms. The two straightening mechanisms are arranged at intervals along the height direction of the connecting seat. The straightening mechanism includes a wheel fork and two pulleys symmetrically arranged on the wheel fork. The sliding space of the rod is formed between the two pulleys. The rod and the two pulleys are against each other to generate friction while limiting the rod from deviating in the direction of the two pulleys through the two pulleys. The friction drives the pulley to rotate to match the reciprocating motion of the rod during operation. The two straightening mechanisms are perpendicular to each other. Although, the prior art uses four pulleys to cooperate with each other to achieve positioning in four directions, so as to constrain the rod to the center position, thereby achieving the straightening of the rod. The friction between the rod and the pulley causes the pulley to rotate, reducing the wear and loss of the device. However, when the oil pump drives the rod to reciprocate and lift, friction is generated between the rod and the pulley. The friction between the two is relatively large, which causes wear to both the rod and the pulley, reducing the service life of the rod and the pulley. Therefore, the existing technology has certain limitations.

[0004] In summary, the problems existing in the prior art are: the friction between the fixed pulley and the polished rod is large, which easily causes the polished rod to wear and reduces the service life of the polished rod. In order to solve the problems existing in the prior art, this case is specially proposed to solve them. Utility Model Content

[0005] 1. Technical issues to be resolved

[0006] In view of the deficiencies in the prior art, the utility model provides a polished rod centralizer for a pumping well, which solves the problems raised in the above-mentioned background technology.

[0007] (II) Technical solution

[0008] To achieve the above purpose, the utility model is implemented through the following technical solutions: a pumping well polished rod straightener, which is fixedly installed on the pumping unit frame and is used to straighten the pumping unit polished rod, including a cylinder, the cylinder is sleeved on the outside of the polished rod, and there is a certain distance between the inner wall of the cylinder and the polished rod, a plurality of straightening components are arranged on the side wall of the cylinder, one end of each straightening component abuts against the outer wall of the polished rod, and one end of each straightening component abuts against the outer wall of the polished rod at multiple positions respectively; the straightening component includes a rotary handle, a threaded rod, an annular shell and a plurality of rolling balls, the threaded rod transversely penetrates the side wall of the cylinder and the two are threadedly connected, one end of the threaded rod is rotatably connected to the outer ring side wall of the annular shell, and the other end of the threaded rod is fixedly connected to the rotary handle; a semi-annular inner cavity is opened inside the annular shell, each of the rolling balls is arranged in the semi-annular inner cavity of the annular shell, and the local spherical surface of the rolling ball penetrates the inner ring side wall of the annular shell; the rolling ball and the annular shell are both made of tin-based babbitt alloy material.

[0009] Optionally, a support rod is fixedly connected to the outer wall of the cylinder, and a fixing plate is fixedly connected to one end of the support rod away from the cylinder. The fixing plate has a plurality of bolt holes, and the fixing plate is fixedly mounted to the oil pump frame by a plurality of steel bolts.

[0010] Optionally, the cylinder is composed of a first semi-ring shell and a second semi-ring shell, and the first semi-ring shell is detachably connected to the second semi-ring shell.

[0011] Optionally, the first semi-ring shell and the second semi-ring shell are respectively fixedly connected with ear plates at the upper and lower parts, and the ear plates on the first semi-ring shell and the ear plates on the second semi-ring shell are fixedly installed by bolts.

[0012] (III) Beneficial effects

[0013] The utility model provides a polished rod centralizer for a pumping well, which has the following beneficial effects:

[0014] The rod straightener for a pumping well has the effect of straightening the rod and reducing the wear on the rod through the coordinated arrangement of a cylinder and a plurality of straightening components. The cylinder is fixedly installed on the pumping unit frame, the cylinder surrounds the rod with a certain distance between the two, and a plurality of straightening components on the cylinder are used to abut and limit a plurality of positions of the outer wall of the rod, so that the rod is located as a whole in the center of the cylinder, thereby achieving the straightening of the rod; the straightening component uses a plurality of rolling balls to contact the outer wall of the rod, and a spherical surface of each rolling ball contacts the outer wall of the rod. Compared with the prior art, the direct contact area between the straightener and the rod is reduced, thereby reducing the friction between the two. At the same time, the rolling ball is made of tin-based babbitt alloy material, which greatly reduces the friction between the rolling ball and the rod, thereby greatly reducing the wear on the rod and extending the service life of the rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0016] Figure 1 This is a three-dimensional structural schematic diagram of a polished rod centralizer for a pumping well according to the utility model;

[0017] Figure 2 This is a schematic cross-sectional view of a polished rod centralizer for a pumping well according to the utility model;

[0018] Figure 3 for Figure 2 The enlarged structural diagram at A in the middle;

[0019] Figure 4 It is a three-dimensional structural schematic diagram of an annular shell in a polished rod centralizer for a pumping well according to the utility model;

[0020] Figure 5 The utility model is a three-dimensional structural schematic diagram of a threaded rod in a polished rod centralizer for a pumping well.

[0021] In the figure: 1, cylinder; 101, first semi-ring shell; 102, second semi-ring shell; 103, ear plate; 104, bolt; 2, bare rod; 3, support rod; 4, fixing plate; 5, threaded rod; 6, rotary handle; 7, annular shell; 8, semi-ring inner cavity; 9, rolling ball. DETAILED DESCRIPTION

[0022] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indications or implications.

[0023] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments.

[0024] See also Figures 1 to 5 The utility model provides a technical solution: a pumping well bare rod straightener, which is fixedly installed on the pumping unit frame and is used to straighten the pumping unit bare rod 2, including a cylinder 1, a support rod 3 is fixedly connected to the outer wall of the cylinder 1, and a fixing plate 4 is fixedly connected to the end of the support rod 3 away from the cylinder 1. The fixing plate 4 is provided with a plurality of bolt holes, and the fixing plate 4 is fixedly installed with the pumping unit frame through a plurality of steel bolts.

[0025] The support rod 3 and the fixing plate 4 are used to support and fix the cylinder 1 on the oil pumping unit frame.

[0026] The cylinder 1 is sleeved on the outside of the polished rod 2, and there is a certain distance between the inner wall of the cylinder 1 and the polished rod 2. A plurality of straightening components are arranged on the side wall of the cylinder 1, and one end of each straightening component abuts against the outer wall of the polished rod 2, and one end of each straightening component abuts against the outer wall of the polished rod 2 at multiple positions.

[0027] The cylinder 1 has a certain height and is sleeved outside the polished rod 2 along the length direction thereof. Each straightening assembly is used to straighten the polished rod 2. By fixing the cylinder 1 on the pumping unit frame, the cylinder 1 surrounds the polished rod 2 with a certain distance between the two, and using multiple straightening assemblies on the cylinder 1 to abut and limit multiple parts of the outer wall of the polished rod 2, the polished rod 2 is located in the center of the cylinder 1 as a whole, thereby achieving the straightening of the polished rod 2.

[0028] The straightening assembly includes a rotary handle 6, a threaded rod 5, an annular shell 7 and a plurality of rolling balls 9. The threaded rod 5 transversely penetrates the side wall of the cylinder 1 and the two are threadedly connected. One end of the threaded rod 5 is rotatably connected to the outer ring side wall of the annular shell 7, and the other end of the threaded rod 5 is fixedly connected to the rotary handle 6. A semi-annular inner cavity 8 is provided inside the annular shell 7. Each rolling ball 9 is arranged in the semi-annular inner cavity 8 of the annular shell 7, and a partial spherical surface of the rolling ball 9 penetrates the inner ring side wall of the annular shell 7. Each rolling ball 9 can roll in the annular shell 7, and the semi-annular inner cavity 8 of the annular shell 7 is filled with lubricating oil. The rolling ball 9 and the annular shell 7 are both made of tin-based babbitt alloy material.

[0029] The rotary handle 6 and the threaded rod 5 are used to adjust the distance between the annular shell 7 and the polished rod 2. By rotating the rotary handle 6, the rotary handle 6 drives the threaded rod 5 to rotate on the side wall of the cylinder 1, and the threaded rod 5 rotates to push the annular shell 7 to move laterally, and the annular shell 7 moves closer to or away from the polished rod 2 when moving laterally. When the annular shell 7 is close to the polished rod 2, the annular shell 7 pushes each ball 9 to approach the polished rod 2, and each ball 9 abuts against the polished rod 2. When each ball 9 in the plurality of straightening assemblies abuts against the polished rod 2 at different positions and different heights, each straightening assembly straightens the polished rod 2 through each ball 9.

[0030] The straightening assembly uses a plurality of rolling balls 9 to contact the outer wall of the polished rod 2. The spherical surface of each rolling ball 9 contacts the outer wall of the polished rod 2 at one point. Compared with the prior art, the direct contact area between the straightening device and the polished rod 2 is reduced, thereby reducing the friction between the two and greatly reducing the wear of the straightening device on the polished rod 2. At the same time, the rolling balls 9 are made of tin-based babbitt alloy material, which greatly reduces the friction between the rolling balls 9 and the polished rod 2, thereby greatly reducing the wear on the polished rod 2 and extending the service life of the polished rod 2.

[0031] Specifically, the cylinder 1 is composed of a first semi-ring shell 101 and a second semi-ring shell 102, and the first semi-ring shell 101 is detachably connected to the second semi-ring shell 102. The upper and lower parts of the first semi-ring shell 101 and the second semi-ring shell 102 are respectively fixedly connected (including welding) with ear plates 103, and the ear plates 103 on the first semi-ring shell 101 and the ear plates 103 on the second semi-ring shell 102 are fixedly installed by bolts 104.

[0032] The cylinder 1 adopts a two-petal structure so as to be easily mounted on the outside of the polished rod 2. The first semi-ring shell 101 and the second semi-ring shell 102 are fixedly installed by bolts 104 and then combined to form the cylinder 1. The cylinder 1 is composed of the first semi-ring shell 101 and the second semi-ring shell 102, which is convenient for maintenance and installation. When installing a pumping well polished rod centralizer shown in this case, the installation work can be achieved without changing the original pumping unit and the polished rod 2 structure.

[0033] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A polished rod centralizer for a pumping well, characterized in that: It is fixedly mounted on a pumping unit frame and is used to straighten a bare rod (2) of the pumping unit, comprising a cylinder (1), the cylinder (1) being sleeved outside the bare rod (2), and a certain distance between the inner wall of the cylinder (1) and the bare rod (2), a plurality of straightening components being arranged on the side wall of the cylinder (1), one end of each straightening component being in contact with the outer wall of the bare rod (2), and one end of each straightening component being in contact with the outer wall of the bare rod (2) at a plurality of positions; The straightening assembly comprises a rotary handle (6), a threaded rod (5), an annular shell (7) and a plurality of rolling balls (9); the threaded rod (5) transversely penetrates the side wall of the cylinder (1) and the two are threadedly connected; one end of the threaded rod (5) is rotatably connected to the outer ring side wall of the annular shell (7), and the other end of the threaded rod (5) is fixedly connected to the rotary handle (6); a semi-annular inner cavity (8) is provided inside the annular shell (7), and each of the rolling balls (9) is arranged in the semi-annular inner cavity (8) of the annular shell (7), and a partial spherical surface of the rolling ball (9) penetrates the inner ring side wall of the annular shell (7); The rolling ball (9) and the annular shell (7) are both made of tin-based babbitt alloy material.

2. A polished rod centralizer for a pumping well according to claim 1, characterized in that: A support rod (3) is fixedly connected to the outer wall of the cylinder (1); an end of the support rod (3) away from the cylinder (1) is fixedly connected to a fixing plate (4); a plurality of bolt holes are provided on the fixing plate (4); and the fixing plate (4) is fixedly mounted to the oil pump frame via a plurality of steel bolts.

3. A polished rod centralizer for a pumping well according to claim 2, characterized in that: The cylinder (1) is composed of a first semi-ring shell (101) and a second semi-ring shell (102), and the first semi-ring shell (101) and the second semi-ring shell (102) are detachably connected.

4. A polished rod centralizer for a pumping well according to claim 3, characterized in that: The first semi-ring shell (101) and the second semi-ring shell (102) are respectively fixedly connected with ear plates (103) at the upper and lower parts thereof; the ear plates (103) on the first semi-ring shell (101) and the ear plates (103) on the second semi-ring shell (102) are fixedly mounted by bolts (104).

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