Offset-bow centralizer device

The technology of a centralizer and an eccentric bow is applied in the field of cementing tools for petroleum development, and can solve the problems of limited centralizing effect of rigid centralizers and elastic centralizers, large friction resistance of casings, and small flow area, so as to improve displacement efficiency, Large annular flow area, reducing the effect of welding points

Pending Publication Date: 2017-09-05
CHANGQING GUJING OF CNPC CHUANQING DRILLING ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the limited effect of existing rigid centralizers and elastic centralizers, which bring greater frictional resistance to the lowering of the sleeve, and the flow area is small, and the impact of the existing stop ring structure on the sleeve There is a certain damage problem

Method used

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  • Offset-bow centralizer device
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  • Offset-bow centralizer device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] This embodiment provides a figure 1 , figure 2 The partial bow centralizer device shown includes a centralizer body 1, and both ends of the centralizer body 1 are provided with stop rings, and the centralizer body 1 is a hollow structure, including a plurality of The supporting ribs 4, and there is a gap between two adjacent supporting ribs 4, the supporting ribs 4 are asymmetric partial bow structures, and the arcuate parts of two adjacent asymmetric partial bow structures are arranged in a staggered manner.

[0026] The eccentric centralizer device provided in this embodiment is installed on the surface of the casing, the main body 1 of the centralizer is fixed by stop rings at both ends, and the support ribs 4 evenly distributed in the circumferential direction are asymmetrical eccentric structures, increasing the annular space The circulation area can effectively improve the displacement efficiency of circulating drilling fluid. When the casing enters the deviated...

Embodiment 2

[0028] On the basis of Embodiment 1, this embodiment provides a partial bow centralizer device, the stop ring includes a stop inner ring 2 and a stop outer ring 3, and the stop inner ring 2 and the centralizer body 1 is connected at both ends, and the stop outer ring 3 is sleeved outside the stop inner ring 2 and the two are fixedly connected.

[0029] The stop inner ring 2 includes a compressible structure and a first connection part 7 arranged in sequence from top to bottom, and the stop outer ring 3 includes a compression structure and a second connection part 9 arranged in sequence from top to bottom , the inner diameter of the compression structure is smaller than the outer diameter of the compressible structure, and the stop outer ring 3 and the stop inner ring 2 are connected through the first connecting part 7 and the second connecting part 9 .

[0030] The partial bow centralizer device provided in this embodiment compresses the compressible structure of the inner sto...

Embodiment 3

[0032] On the basis of Embodiment 2, this embodiment provides a partial bow centralizer device, the compressible structure is composed of a first compressive cone surface 5, a shrinkable part 6, and a shrinkage gap 10. The first The pressing cone surface 5 is arranged on the top end of the stop inner ring 2, the shrinkable part 6 is connected with the lower part of the first pressing cone surface 5, and the first pressing cone surface 5 is small at the top and large at the bottom;

[0033] The contraction gap 10 runs through the first pressing cone surface 5 and the shrinkable portion 6 , and a plurality of shrinkage gaps 10 are evenly arranged in the circumferential direction, dividing the first pressing cone surface 5 and the shrinkable portion 6 into multiple parts.

[0034] The pressing structure is a second pressing cone surface 8, the second pressing cone surface 8 is arranged at the top of the stop outer ring 3, and the second pressing cone surface 8 is small at the top ...

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Abstract

The invention provides an offset-bow centralizer device. The offset-bow centralizer device comprises a centralizer body, wherein stop rings are arranged at two ends of the centralizer body, the centralizer body is in a hollow structure, and comprises a plurality of support ribs arranged uniformly circumferentially, a gap is formed between every two adjacent support ribs, the support ribs are in a structure of asymmetrical offset bow, and bow parts of every two adjacent asymmetrical offset bow structures are staggered. An offset-bow support device is added to a traditional centralizer, welding points are reduced, and an overall structure is adopted, so that the centralizer device has a high casing centralizing effect and large annulus flow area, and displacement efficiency of circulating drilling fluid can be effectively improved; when a casing enters an inclined shaft section or a horizontal section, a casing body cannot be closely attached to the bottom of a borehole, the centralizing effect is good, a friction area is reduced, and accordingly, a frictional resistance coefficient between the casing and the well wall is reduced, frictional resistance is greatly reduced, and the casing is fed into a shaft smoothly.

Description

technical field [0001] The invention belongs to the technical field of oil development cementing tools, and in particular relates to a partial bow centralizer device. Background technique [0002] In order to increase single well production and oil recovery, and reduce oil and gas development and production costs, horizontal well technology has been widely used. However, the horizontal section of the horizontal well string will be affected by gravity, which will cause uneven force on the packer rubber sleeve, which will reduce the sealing performance of the packer, and at the same time, the target interval cannot be effectively separated. Process strings such as staged fracturing, well completion, and mechanical water search and plugging cannot achieve the intended purpose. [0003] In order to solve the problem that the horizontal section of the horizontal well string will be affected by gravity, the existing technology uses rigid centralizers and elastic centralizers alte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B17/10
CPCE21B17/1078
Inventor 魏周胜李志刚刘丰克包国栋秦仲奎段宏超
Owner CHANGQING GUJING OF CNPC CHUANQING DRILLING ENG
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