Oil pipe centralizer

Abstract

The utility model discloses an oil pipe centralizer which comprises a pipe body and a centralizing mechanism. The pipe body comprises an upper connector, a lower connector and a central pipe, and the two ends of the central pipe are detachably connected with the upper connector and the lower connector respectively. The centralizing mechanism comprises a pair of rocker seats, a pair of rockers and a centralizing block which are arranged in a group, the two rocker seats abut against the outer side of the center pipe respectively, the rockers are hinged to the rocker seats, and the centralizing block is hinged between the two rockers. According to the utility model, the pair of rocker seats, the pair of rockers and the centralizing blocks are arranged in groups, so that a centralizing structure which is more stable and better in adaptability is constructed.

Description

Technical Field

[0001] This utility model relates to the field of downhole tool technology, specifically to a tubing centralizer. Background Technology

[0002] In oil well operations, if the tubing is not centered, cement slurry cannot be evenly distributed between the casing and the wellbore during subsequent operations, such as cementing. Therefore, tubing centralizers are typically used to keep the tubing centered within the wellbore, allowing the cement slurry to distribute evenly around the tubing and form a high-quality cement annulus. For example, in some deep wells and deviated wells, tubing centralizers ensure a uniform annular space between the tubing and the wellbore, thereby improving cementing quality. For subsequent oil production operations, tubing centering also helps reduce wear. When the tubing is not centered, the swaying and vibration during production will increase friction with the casing wall, easily leading to damage to both the tubing and casing. Centralizers stabilize the tubing, extending the service life of both the tubing and casing.

[0003] Currently, tubing centralizers on the market are mainly divided into elastic centralizers and mechanical centralizers. Rigid centralizers have high requirements for environmental factors such as the wellbore, and cannot have sections with varying diameters, otherwise they will not function properly. Furthermore, due to their relatively fixed structure, they are prone to significant friction and collision with the inner wall of the casing during tubing insertion and retrieval, potentially leading to wear of the casing or tubing. The bow-shaped springs of elastic centralizers may experience elastic fatigue and deformation over long-term use, resulting in a gradual decrease in centralizing effect. For example, utility model patent CN217999512U discloses a tubing centralizer that constructs a centralizing structure by setting a first centralizing element, a second centralizing element, and an anti-slip mechanism; specifically, centralizing is achieved using the first and second centralizing elements, and anti-slip teeth increase the friction between the centralizer and the tubing, increasing stability. However, this structure is prone to excessive friction, reducing service life and stability.

[0004] This means that existing tubing centralizers generally suffer from poor adaptability. Utility Model Content

[0005] The purpose of this utility model is to overcome the above-mentioned technical deficiencies and propose a tubing centralizer to solve the technical problem that the tubing centralizers in the prior art generally have poor adaptability.

[0006] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0007] This utility model provides a tubing centralizer, including a tubing body and a centralizing mechanism; the tubing body includes an upper connector, a lower connector and a central tube, the two ends of the central tube being detachably connected to the upper connector and the lower connector respectively; the centralizing mechanism includes a pair of rocker arm seats, a pair of rocker arms and a centralizing block arranged in a group, the two rocker arm seats respectively abutting against the outside of the central tube, the rocker arms being hinged to the rocker arm seats, and a centralizing block being hinged between the two rocker arms.

[0008] In some embodiments, the straightening mechanism includes at least three sets of rocker seats, rocker arms, and straightening blocks.

[0009] In some embodiments, each set of rocker seats is evenly distributed around the outer wall of the central tube.

[0010] In some embodiments, a shearing ring is fitted onto the side of the central tube near the lower connector.

[0011] In some embodiments, a shear pin is provided between the lower connector and the shear ring.

[0012] In some embodiments, the central tube is threadedly connected to the lower connector.

[0013] In some embodiments, the rocker arm and the centering block are connected by a pin.

[0014] In some embodiments, the side of the straightening block opposite to the central tube is curved.

[0015] In some embodiments, the rocker arm has a clearance surface on the side near the upper connector.

[0016] In some embodiments, the two ends of the central tube are threadedly connected to the upper connector and the lower connector, respectively.

[0017] Compared with the prior art, the tubing centralizer provided by this utility model constructs a basic centralizing structure through a pair of rocker arm seats, a pair of rockers, and a centralizing block arranged in a group. Furthermore, the two rocker arm seats are respectively abutted against the outside of the central tube, the rockers are hinged to the rocker arm seats, and a centralizing block is hinged between the two rockers. This allows the rocker arm seats to drive the rockers to rotate and drive the centralizing block to tilt and protrude outward, ultimately forming a uniform and gentle centralizing and fixing shape. This not only avoids the problems of elastic fatigue and deformation of elastic centralizers, but also effectively prevents the service life from being reduced due to excessive friction and collision. Attached Figure Description

[0018] Figure 1 This is a cross-sectional view of a tubing stabilizer provided in an embodiment of this utility model (stabilizing block not open).

[0019] Figure 2 This is a cross-sectional view (with the centralizing block in the open state) of a tubing centralizer provided in an embodiment of this utility model.

[0020] Figure 3 yes Figure 2 The left view.

[0021] Explanation of reference numerals in the attached figures:

[0022] 100. Pipe body; 110. Upper connector; 120. Lower connector; 130. Central pipe; 200. Straightening mechanism; 210. Rocker arm seat; 220. Rocker arm; 221. Yield surface; 230. Straightening block; 240. Pin; 300. Shear ring; 400. Shear pin. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0024] To address the technical problem of limited adaptability in existing tubing centralizers, this invention provides a tubing centralizer that effectively improves adaptability.

[0025] It should be noted that the tubing centralizer described in this utility model is used for, but not limited to, downhole operations. For ease of explanation, this utility model only uses the application of a tubing centralizer in downhole equipment as an example. The principle of the tubing centralizer applied to other types of equipment is essentially the same as that applied to downhole equipment, and will not be described in detail here.

[0026] Please see Figure 1 - Figure 3 , Figure 1 This is a schematic diagram of the structure of a tubing centralizer according to an embodiment of the present invention. The tubing centralizer includes a tubing body 100 and a centralizing mechanism 200. The tubing body 100 includes an upper connector 110, a lower connector 120 and a central tube 130. The two ends of the central tube 130 are detachably connected to the upper connector 110 and the lower connector 120, respectively. The centralizing mechanism 200 includes a pair of rocker arm seats 210, a pair of rocker arms 220 and a centralizing block 230 arranged in a group. The two rocker arm seats 210 are respectively abutted against the outside of the central tube 130. The rocker arms 220 are hinged to the rocker arm seats 210, and the centralizing block 230 is hinged between the two rocker arms 220.

[0027] In this embodiment, a basic straightening structure is constructed by a pair of rocker arm seats 210, a pair of rockers 220, and a straightening block 230 arranged in a group. Furthermore, the two rocker arm seats 210 are respectively abutted against the outside of the central tube 130, the rockers 220 are hinged to the rocker arm seats 210, and the straightening block 230 is hinged between the two rockers 220. This allows the rocker arm seats 210 to drive the rockers 220 to rotate and drive the straightening block 230 to tilt and protrude outward, ultimately forming a uniform and gentle straightening and fixing shape. This not only avoids the problems of elastic fatigue and deformation of the elastic straightener, but also effectively prevents the service life from decreasing due to excessive friction and collision, thus effectively improving applicability.

[0028] In one embodiment, please refer to Figure 1 , Figure 3 The straightening mechanism 200 includes at least three sets of rocker seats 210, rocker 220 and straightening blocks 230.

[0029] In this embodiment, setting the number of groups to three helps to improve the speed and stability of the straightening process.

[0030] In one embodiment, please refer to Figure 2 , Figure 3 Each rocker arm seat 210 is evenly distributed around the outer wall of the central tube 130.

[0031] In this embodiment, each set of rocker arm seats 210 is evenly distributed around the outer wall of the central tube 130, which can improve the uniformity of the straightening.

[0032] In one embodiment, please refer to Figure 1 A shearing ring 300 is fitted on the side of the central tube 130 near the lower connector 120.

[0033] In one embodiment, please refer to Figure 1 A shear pin 400 is inserted between the lower connector 120 and the shear ring 300.

[0034] In one embodiment, please refer to Figure 1 The central tube 130 is threadedly connected to the lower connector 120.

[0035] In one embodiment, please refer to Figure 1 The rocker arm 220 is connected to the straightening block 230 via a pin 240.

[0036] In one embodiment, please refer to Figure 1 , Figure 3 The side of the straightening block 230 that is away from the center tube 130 has an arc.

[0037] In this embodiment, the straightening block 230 has an arc on the side opposite to the central tube 130, so that it can fit better with the sleeve.

[0038] In one embodiment, please refer to Figure 1 The rocker arm 220 has a clearance surface 221 on the side near the upper connector 110.

[0039] In this embodiment, the arrangement of the give-off surface 221 helps the rocker arm 220 to rotate at a larger angle, thereby increasing the range of diameter variation.

[0040] In one embodiment, please refer to Figure 1 The two ends of the central tube 130 are threadedly connected to the upper connector 110 and the lower connector 120, respectively.

[0041] To better understand this utility model, the following is combined with... Figures 1 to 2 The technical solution of this utility model is described in detail below:

[0042] First, when the lower connector 120 is equipped with tools or reaches the bottom, the resistance generated reaches the shearing start value of the shearing pin 400, and the tubing centralizer begins to work. Then, the shearing pin 400 is sheared, and the shearing ring 300 moves downwards to abut against the lower connector 120. The shearing ring 300 is threadedly connected to the central tube 130, which in turn drives the rocker arm seat 210 downwards. The rocker arm seat 210 has an outward tilt angle, and the rocker arm 220 extends outwards along the tilt angle of the rocker arm seat 210. The rocker arm 220 is connected to the centralizing block 230 via a pin 240, causing the centralizing block 230 to move closer to the inner wall of the casing until complete contact is made, completing the centralization. This structure, through the rocker arm structure of the rocker arm seat 210 and the rocker arm 220, achieves diameter variation and stable support and centralization, effectively avoiding problems such as reduced lifespan, excessive wear, and collisions, thus effectively improving the adaptability of the tubing centralizer.

[0043] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A tubing centralizer, characterized in that, include: The tube body includes an upper connector, a lower connector, and a central tube, with both ends of the central tube being detachably connected to the upper connector and the lower connector, respectively. as well as The straightening mechanism includes a pair of rocker arm seats, a pair of rockers, and a straightening block arranged in a group. The two rocker arm seats respectively abut against the outside of the central tube. The rockers are hinged to the rocker arm seats, and a straightening block is hinged between the two rockers.

2. The tubing centralizer according to claim 1, characterized in that, The straightening mechanism includes at least three sets of rocker arm seats, rocker arms, and straightening blocks.

3. A tubing centralizer according to claim 2, characterized in that, Each set of rocker arm seats is evenly distributed around the outer wall of the central tube.

4. A tubing centralizer according to claim 1, characterized in that, A shearing ring is fitted on the side of the central tube near the lower connector.

5. A tubing centralizer according to claim 4, characterized in that, A shear pin is inserted between the lower connector and the shear ring.

6. A tubing centralizer according to claim 4, characterized in that, The central tube is threadedly connected to the lower connector.

7. A tubing centralizer according to claim 1, characterized in that, The rocker arm and the straightening block are connected by a pin.

8. A tubing centralizer according to claim 1, characterized in that, The straightening block has an arc on the side opposite to the central tube.

9. A tubing centralizer according to claim 1, characterized in that, The rocker arm has a clearance surface on the side near the upper connector.

10. A tubing centralizer according to claim 1, characterized in that, The two ends of the central tube are threadedly connected to the upper connector and the lower connector, respectively.

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