Sucker rod string righting device

Abstract

An upper oil pipe, an oil pipe coupling and a lower oil pipe are sequentially connected, a hanging section, an inserting section and an overflowing channel are arranged on the outer wall of a centralizing sleeve, the outer diameter of the hanging section is larger than the inner diameter of the lower oil pipe, and the outer diameter of the hanging section is smaller than the inner diameter of the oil pipe coupling. The length of the hanging section is smaller than the distance between the lower end face of the upper oil pipe and the upper end face of the lower oil pipe, the insertion section can be inserted into the upper portion of the lower oil pipe, the centralizing sleeve is hung on the upper portion of the lower oil pipe, a shoulder of the hanging section is located on the upper end face of the lower oil pipe, and the hanging section is located below the lower end face of the upper oil pipe. The hanging section is located in the tubing coupling, the outer diameter of a rod body of the matched sucker rod is smaller than the inner diameter of the centralizing sleeve, the matched sucker rod is put into the upper tubing, the tubing coupling, the centralizing sleeve and the lower tubing, the rod body of the matched sucker rod is matched with the inner wall of the centralizing sleeve, and the matched sucker rod is not in contact with the inner wall of the upper tubing and the inner wall of the lower tubing. And the upper oil pipe is communicated with the lower oil pipe through the overflowing channel.

Description

Technical Field

[0001] The utility model relates to oil production equipment in the petroleum industry, in particular to a pumping rod column straightening device. Background Art

[0002] In the sucker rod pumping system, whether it is a vertical well or an inclined well, the sucker rod and the oil pipe are in relative motion in contact. Therefore, there is inevitable wear between the sucker rod and the oil pipe, especially in deep wells and inclined wells. The sucker rod is easy to bend in the oil pipe, resulting in serious eccentric wear of the sucker rod on the oil pipe. After the eccentric wear occurs, the oil pipe and the sucker rod cannot be used, resulting in oil well operation, short maintenance-free period of the oil well, increased operating costs, increased rod and pipe consumption, more oil well shutdown time, and reduced crude oil production. In order to solve this problem, the oil field uses a device called sucker rod anti-wear pair on wells with eccentric wear. This device is to set an anti-wear sleeve on the smooth anti-wear rod, and go down into the oil pipe on the pump with the sucker rod. When pumping oil, the anti-wear sleeve is required to be fixed on the inner wall of the oil pipe, and the smooth anti-wear rod moves relative to the anti-wear sleeve. The surface of the anti-wear rod body is smooth, and the friction is small when moving, and no wear will occur. However, the anti-wear sleeve of this device has a small supporting force with the inner wall of the oil pipe, and always moves with the smooth anti-wear rod, and the anti-wear sleeve itself is easy to wear. Therefore, the problem of eccentric wear of the oil pipe by the sucker rod still exists.

[0003] The sucker rod pump oil production equipment has the characteristics of simple structure and strong adaptability. It is currently the most widely used mechanical oil production equipment in onshore oil production. In this type of sucker rod pump oil production equipment, the sucker rod reciprocates in the oil pipe, and the sucker rod and the oil pipe wear each other eccentrically, especially in deep wells and directional wells with high water content. Well inclination, unstable bending of the sucker rod and the oil pipe are the direct causes of the eccentric wear between the sucker rod and the oil pipe, and well fluid corrosion plays a catalytic role in eccentric wear. The failure of the sucker rod and the oil pipe due to eccentric wear will increase the cost of well repair, reduce the time of well opening, affect the production of the oil well, and increase the cost of oil production.

[0004] In order to reduce the eccentric wear between the sucker rod and the tubing, people install sucker rod centralizers on the sucker rods. The materials of such sucker rod centralizers are usually non-metallic materials. It is hoped that the eccentric wear between the sucker rod and the tubing can be reduced by wearing the sucker rod centralizers. However, due to the catalytic effect of well fluid corrosion on eccentric wear, such sucker rod centralizers inevitably eccentrically wear against the sucker rod and the tubing, and the sucker rod and the tubing inevitably fail due to eccentric wear. Later, people used lined tubing and anti-corrosion sucker rods to reduce the corrosion and eccentric wear of the sucker rod and the tubing, but the cost is high, the lined tubing reduces the inner diameter of the tubing, and the temperature resistance of the lined tubing is also limited. Therefore, the problem of eccentric wear of the sucker rod and the tubing still exists. Utility Model Content

[0005] The utility model aims to design a sucker rod column straightening device, which has a long service life, does not wear the oil pipe, and avoids the problem of eccentric wear of the sucker rod and the oil pipe due to eccentricity of the sucker rod in the oil pipe.

[0006] The purpose of the utility model is achieved in this way: it includes an upper oil pipe, an oil pipe coupling, and a lower oil pipe, which are connected in sequence, and also includes a straightening sleeve and a matching sucker rod. The outer wall of the straightening sleeve has a hanging section, an insertion section, and a flow passage. The outer diameter of the hanging section is greater than the inner diameter of the lower oil pipe, the outer diameter of the hanging section is smaller than the inner diameter of the oil pipe coupling, the length of the hanging section is smaller than the distance between the lower end face of the upper oil pipe and the upper end face of the lower oil pipe, the insertion section is matched with the inner wall of the lower oil pipe, and the insertion section can be inserted into In the upper part of the lower oil pipe, the straightening sleeve is suspended on the upper part of the lower oil pipe, the shoulder of the hanging section sits on the upper end surface of the lower oil pipe, the hanging section is located below the lower end surface of the upper oil pipe, the hanging section is located in the oil pipe coupling, the outer diameter of the rod body of the matching sucker rod is smaller than the inner diameter of the straightening sleeve, the matching sucker rod is lowered into the upper oil pipe, the oil pipe coupling, the straightening sleeve and the lower oil pipe, the rod body of the matching sucker rod is matched with the inner wall of the straightening sleeve, so that the matching sucker rod does not contact the inner walls of the upper oil pipe and the lower oil pipe, and the flow passage enables the upper oil pipe to communicate with the lower oil pipe.

[0007] The beneficial effects of the utility model are as follows: the matched sucker rod can always reciprocate in the straightening sleeve, so that it is in a straightening state, and does not contact the inner walls of the upper oil pipe and the lower oil pipe, and the inner walls of the upper oil pipe and the lower oil pipe will not be worn. The matched sucker rod and the straightening sleeve have been finely processed. Although there is relative sliding between them, the friction coefficient is small, the wear is light, and it is not easy to wear. Therefore, the utility model has good performance and long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Attached Figure 1 It is an installation diagram of an embodiment of the utility model.

[0009] Attached Figure 2 This utility model Figure 1 The outline drawing of the parts marked as 3. DETAILED DESCRIPTION

[0010] The embodiments of the present utility model are described below in conjunction with the accompanying drawings.

[0011] As shown in the figure, the embodiment of the utility model includes an upper oil pipe 1, an oil pipe coupling 2, a straightening sleeve 3, a matching sucker rod 4, and a lower oil pipe 5. The upper oil pipe 1, the oil pipe coupling 2, and the lower oil pipe 5 are connected in sequence. The outer wall of the straightening sleeve 3 has a hanging section 3-1, an inserting section 3-2, and a flow passage 3-3. The outer diameter of the hanging section 3-1 is greater than the inner diameter of the lower oil pipe 5, and the outer diameter of the hanging section 3-1 is smaller than the inner diameter of the oil pipe coupling 2. The length of the hanging section 3-1 is smaller than the distance between the lower end face of the upper oil pipe 1 and the upper end face of the lower oil pipe 5. The inserting section 3-2 is matched with the inner wall of the lower oil pipe 5, and the inserting section 3-2 can be inserted The supporting sleeve 3 is suspended on the upper part of the lower oil pipe 5, the shoulder of the suspension section 3-1 sits on the upper end surface of the lower oil pipe 5, the suspension section 3-1 is located below the lower end surface of the upper oil pipe 1, the suspension section 3-1 is located in the oil pipe coupling 2, the outer diameter of the rod body of the matching sucker rod 4 is smaller than the inner diameter of the supporting sleeve 3, the matching sucker rod 4 is lowered into the upper oil pipe 1, the oil pipe coupling 2, the supporting sleeve 3, and the lower oil pipe 5, the rod body of the matching sucker rod 4 is matched with the inner wall of the supporting sleeve 3, so that the matching sucker rod 4 does not contact the inner wall of the upper oil pipe 1 and the lower oil pipe 5, and the flow passage 3-3 makes the upper oil pipe 1 communicate with the lower oil pipe 5. The inner hole of the supporting sleeve 3 is trumpet-shaped, which is convenient for the matching sucker rod 4 to be lowered.

[0012] The straightening sleeve 3 cannot move up and down or move radially under the restriction of the lower end surface of the upper oil pipe 1 and the upper end surface of the lower oil pipe 5. The length of the hanging section 3-1 does not hinder the connection between the upper oil pipe 1, the oil pipe coupling 2 and the lower oil pipe 5.

[0013] The upper oil pipe 1, the oil pipe coupling 2, the straightening sleeve 3, and the lower oil pipe 5 are a unit body, and the entire oil pipe string is composed of a plurality of the unit bodies connected in series according to the oil well pump depth. The number of the matching sucker rods 4 matches the unit body.

Claims

1. A sucker rod string straightening device, comprising an upper oil pipe (1), an oil pipe coupling (2), and a lower oil pipe (5), wherein the upper oil pipe (1), the oil pipe coupling (2), and the lower oil pipe (5) are connected in sequence, and wherein: It also includes a straightening sleeve (3) and a matching sucker rod (4); the outer wall of the straightening sleeve (3) has a hanging section (3-1), an insertion section (3-2), and a flow passage (3-3); the outer diameter of the hanging section (3-1) is greater than the inner diameter of the lower oil pipe (5); the outer diameter of the hanging section (3-1) is smaller than the inner diameter of the oil pipe coupling (2); the length of the hanging section (3-1) is smaller than the distance between the lower end surface of the upper oil pipe (1) and the upper end surface of the lower oil pipe (5); the insertion section (3-2) matches the inner wall of the lower oil pipe (5); the insertion section (3-2) can be inserted into the upper part of the lower oil pipe (5); the straightening sleeve (3) is hung on the upper part of the lower oil pipe (5); The shoulder of the hanging section (3-1) is seated on the upper end surface of the lower oil pipe (5), the hanging section (3-1) is located below the lower end surface of the upper oil pipe (1), the hanging section (3-1) is located inside the oil pipe coupling (2), the outer diameter of the rod body of the matching sucker rod (4) is smaller than the inner diameter of the straightening sleeve (3), the matching sucker rod (4) is lowered into the upper oil pipe (1), the oil pipe coupling (2), the straightening sleeve (3), and the lower oil pipe (5), the rod body of the matching sucker rod (4) is matched with the inner wall of the straightening sleeve (3), so that the matching sucker rod (4) does not contact the inner walls of the upper oil pipe (1) and the lower oil pipe (5), and the flow passage (3-3) enables the upper oil pipe (1) to communicate with the lower oil pipe (5).

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