A hydraulic rigid centralizer

Abstract

The utility model discloses a hydraulic rigid centralizer, including a pipe body, the outer wall of the pipe body is fixedly connected with a first fixed sleeve, the outer wall of the pipe body is fixedly connected with a second fixed sleeve, the first fixed sleeve is fixedly connected with a hydraulic hollow pipe at one end close to the second fixed sleeve, a sealing ring is provided in the hydraulic hollow pipe and is slidably connected with the sealing ring, the sealing ring is sleeved on the outer wall of the pipe body and is slidably connected with the sealing ring, the sealing ring is fixedly connected with a sliding pipe, the sliding pipe is fixedly connected with a plurality of first centralizing plates, each of the first centralizing plates is fixedly connected with a second centralizing plate, and a plurality of the second centralizing plates are fixedly connected with the second fixed sleeve. The utility model can push the sealing ring to move by injecting hydraulic oil, so that the first centralizing plate and the second centralizing plate are bent outward and contact and resist against the well wall, so as to complete the centering of the pipe body, and the pipe diameter is small when lowering, and the lowering is simple.

Description

Technical Field

[0001] The utility model relates to the technical field of centralizers, in particular to a hydraulic rigid centralizer. Background Art

[0002] At present, more and more wells are being developed at home and abroad using horizontal well technology for the development of oil and gas. Centralizers of various forms and specifications are one of the most commonly used tools in cementing construction. Their main function is to ensure that the casing is centered in the wellbore and improve the quality of cementing.

[0003] During cementing of existing horizontal wells, the casing often deviates toward the lower well wall and has poor centering, resulting in poor cementing quality of the horizontal well, which seriously restricts the advantages of horizontal wells. Conventional centralizers also have the problems of large outer diameter and difficulty in lowering. To solve the above problems, a hydraulic rigid centralizer is proposed in the present application. Utility Model Content

[0004] The utility model aims to solve the shortcomings of the prior art and proposes a hydraulic rigid centralizer, which can push the sealing ring to move by injecting hydraulic oil, so that the first centralizing plate and the second centralizing plate are bent outward and contacted with the well wall to complete the centering of the pipe body, and the pipe diameter is small when it is lowered, and the lowering is simple.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A hydraulic rigid centralizer comprises a tube body, wherein the outer wall of the tube body is fixedly connected to a first fixed sleeve, the outer wall of the tube body is fixedly connected to a second fixed sleeve, the end of the first fixed sleeve close to the second fixed sleeve is fixedly connected to a hydraulic hollow tube, a sealing ring is provided in the hydraulic hollow tube and is slidably connected to the tube body, the sealing ring is sleeved on the outer wall of the tube body and is slidably connected to the tube, the sealing ring is fixedly connected to a sliding tube, the sliding tube passes through the hydraulic hollow tube and is slidably connected to the hydraulic hollow tube, the sliding tube is fixedly connected to a plurality of first centralizing plates, each of the first centralizing plates is fixedly connected to a second centralizing plate, a plurality of the second centralizing plates are fixedly connected to the second fixed sleeve, and the first fixed sleeve is penetrated by a hydraulic injection port fixedly connected to the first fixed sleeve.

[0007] Preferably, the outer ring of the sealing ring is sealed with the inner wall of the hydraulic hollow tube, and the inner ring of the sealing ring is sealed with the outer wall of the tube body.

[0008] Preferably, the sliding sleeve is arranged on the outer wall of the tube body and is slidably connected thereto.

[0009] Preferably, the plurality of first centralizing plates are distributed at equal intervals.

[0010] Preferably, the first centralizing plate and the second centralizing plate are made of stainless steel alloy.

[0011] Preferably, the hydraulic hollow tube is communicated with the hydraulic injection port.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] 1. The pipe diameter of the present application is small before it is lowered into the well and large after it is lowered into the well, so that the device can be smoothly lowered to a suitable position and is easy to lower.

[0014] 2. Through the outward deformation of the first and second straightening plates, the deformed part can be brought into contact with the well wall, so that the pipe body is located in the center of the well and the pipe body is straightened in the center.

[0015] In summary, by injecting hydraulic oil, the sealing ring can be pushed to move, so that the first and second straightening plates are bent outward and contact and abut against the well wall, thus completing the centering of the pipe body. Moreover, the pipe diameter is small when lowering, and lowering is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural schematic diagram of a hydraulic rigid centralizer proposed by the utility model;

[0017] Figure 2 A cross-sectional view of a hydraulic rigid centralizer proposed in the utility model;

[0018] Figure 3 for Figure 2 A magnified view of the structure in the middle.

[0019] In the figure: 1 tube body, 2 first fixed sleeve, 3 second fixed sleeve, 4 hydraulic hollow tube, 5 sliding tube, 6 first centralizing plate, 7 second centralizing plate, 8 sealing ring, 9 hydraulic injection port. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0021] Reference Figure 1-Figure 3 A hydraulic rigid centralizer includes a pipe body 1, a first fixed sleeve 2 is fixedly connected to the outer wall of the pipe body 1, and a second fixed sleeve 3 is fixedly connected to the outer wall of the pipe body 1. Through this arrangement, the pipe body 1 can be centrally arranged in the well, and the pipe diameter is small before being lowered into the well and large after being lowered into the well, so that the device can be smoothly lowered to a suitable position.

[0022] One end of the first fixed sleeve 2 close to the second fixed sleeve 3 is fixedly connected with a hydraulic hollow tube 4, and a sealing ring 8 is provided in the hydraulic hollow tube 4 and is slidably connected thereto. The sealing ring 8 is sleeved on the outer wall of the tube body 1 and is slidably connected thereto. The outer ring of the sealing ring 8 is sealed with the inner wall of the hydraulic hollow tube 4, and the inner ring of the sealing ring 8 is sealed with the outer wall of the tube body 1. By injecting hydraulic oil into the hydraulic hollow tube 4, the sealing ring 8 is pushed to slide in the hydraulic hollow tube 4 by the hydraulic oil.

[0023] The sealing ring 8 is fixedly connected to the sliding tube 5, which is sleeved on the outer wall of the pipe body 1 and slidably connected thereto, and the sliding tube 5 passes through the hydraulic hollow tube 4 and is slidably connected thereto, and the sliding tube 5 is fixedly connected to a plurality of first straightening plates 6, and the plurality of first straightening plates 6 are distributed at equal intervals, and each first straightening plate 6 is fixedly connected to a second straightening plate 7, and the first straightening plates 6 and the second straightening plates 7 are made of stainless steel alloy, and the plurality of second straightening plates 7 are fixedly connected to the second fixed sleeve 3, and the outward deformation of the first straightening plates 6 and the second straightening plates 7 can make the deformed part contact and resist against the well wall, so that the pipe body 1 is located in the center of the well, and the pipe body 1 is centered and straightened.

[0024] The first fixed sleeve 2 is penetrated by a hydraulic injection port 9 fixedly connected thereto, the hydraulic hollow tube 4 is communicated with the hydraulic injection port 9, the hydraulic injection port 9 is connected to an external hydraulic pipe, and hydraulic oil is injected from the outside. This technology is prior art and will not be described in detail here.

[0025] In the utility model, in this application, hydraulic oil is injected from the outside into the hydraulic hollow tube 4 through the hydraulic injection port 9, and the sealing ring 8 is pushed to move in the hydraulic hollow tube 4 by the hydraulic oil. The movement of the sealing ring 8 drives the sliding tube 5 to move, so that the multiple first straightening plates 6 and the second straightening plates 7 are bent outward, so that the tube body 1 is centered and straightened. The utility model has the characteristics of small original outer diameter and safe lowering, large outer diameter after expansion, and strong straightening ability, which can ensure the centering degree of the tube body 1.

[0026] The utility model solves the problem that the casing in the prior art has poor centering, resulting in poor cementing quality of horizontal wells and seriously restricting the advantages of horizontal wells, by arranging the first and second centralizing plates to bend outward and contact and abut against the well wall. In addition, conventional centralizers have the problems of large outer diameter and difficulty in lowering.

Claims

1. A hydraulic rigid centralizer, comprising a pipe body (1), characterized in that: The outer wall of the tube body (1) is fixedly connected to a first fixed sleeve (2), and the outer wall of the tube body (1) is fixedly connected to a second fixed sleeve (3). One end of the first fixed sleeve (2) close to the second fixed sleeve (3) is fixedly connected to a hydraulic hollow tube (4). A sealing ring (8) is provided in the hydraulic hollow tube (4) and is slidably connected thereto. The sealing ring (8) is sleeved on the outer wall of the tube body (1) and is slidably connected thereto. The sealing ring (8) is fixedly connected to a sliding tube (5). The sliding tube (5) passes through the hydraulic hollow tube (4) and is slidably connected thereto. The sliding tube (5) is fixedly connected to a plurality of first straightening plates (6), each of the first straightening plates (6) is fixedly connected to a second straightening plate (7), and a plurality of the second straightening plates (7) are fixedly connected to the second fixed sleeve (3). A hydraulic injection port (9) is passed through the first fixed sleeve (2) and is fixedly connected thereto.

2. A hydraulic rigid centralizer according to claim 1, characterized in that: The outer ring of the sealing ring (8) is sealed with the inner wall of the hydraulic hollow tube (4), and the inner ring of the sealing ring (8) is sealed with the outer wall of the tube body (1).

3. A hydraulic rigid centralizer according to claim 1, characterized in that: The sliding tube (5) is sleeved on the outer wall of the tube body (1) and is slidably connected thereto.

4. A hydraulic rigid centralizer according to claim 1, characterized in that: The plurality of first centralizing plates (6) are distributed at equal intervals.

5. A hydraulic rigid centralizer according to claim 1, characterized in that: The first centralizing plate (6) and the second centralizing plate (7) are made of stainless steel alloy.

6. A hydraulic rigid centralizer according to claim 1, characterized in that: The hydraulic hollow tube (4) is communicated with the hydraulic injection port (9).

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