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Casing centralizing device and centralizing method for well completion of horizontal well

A technology for horizontal wells and casings, which can be used in casings, drill pipes, drilling equipment, etc., and can solve problems such as poor quality of casing centering

Pending Publication Date: 2022-02-25
CHINA NATIONAL OFFSHORE OIL (CHINA) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The object of the present invention is to provide a casing straightening device and a casing straightening method for horizontal well completion, so as to solve the existing problem of poor casing centering quality

Method used

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  • Casing centralizing device and centralizing method for well completion of horizontal well
  • Casing centralizing device and centralizing method for well completion of horizontal well
  • Casing centralizing device and centralizing method for well completion of horizontal well

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Embodiment Construction

[0039] The present invention will be further described below in conjunction with the accompanying drawings, but the present invention is not limited to the following embodiments.

[0040] Such as figure 1 As shown, the casing centralization device for horizontal well completion provided by the present invention includes a reamer 1 and a centralizer 2, the reamer 1 is a cylindrical structure with two ends open, and the outer wall of the reamer 1 is evenly distributed with multiple A cone mount 12, each cone mount 12 is rotatably connected with some cones 11 and water jet nozzles 13.

[0041] The centralizer 2 includes a centralizer main body 21, a centralizer slip 22 and a sliding mechanism 23. The centralizer slip 22 is hinged on the outer wall of the centralizer main body 21, and the sliding mechanism 23 is slidably connected with the centralizer main body 21 along the axial direction of the centralizer main body 21. The sliding mechanism 23 and the righting slips 22 are res...

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Abstract

The invention discloses a casing centralizing device and centralizing method for well completion of a horizontal well. The casing centralizing device comprises a reamer and a centralizer which are connected with each other; the reamer is of a cylindrical structure with two open ends, and one end of the reamer is connected with the centralizer; the outer wall of the reamer is rotationally connected with a plurality of cones; the centralizer comprises a centralizer body, a centralizing slip and a sliding mechanism, the centralizing slip is hinged to the outer wall of the centralizer body, and the sliding mechanism can move in the axial direction of the centralizer body to control opening and closing of the centralizing slip. Compared with the prior art, the casing centralizing device has the following advantages that gas in the closed containing cavity is expanded by heating the casing centralizing device for horizontal well completion, the outwards-pushing cylinder drives the hinged centralizing slips to expand towards the periphery, and therefore the centralizer extrudes and fixes the inner wall of a borehole, and by rotating the casing centralizing device for horizontal well completion, the situation that the expansion angle of the centralizing slips towards the periphery is affected by the gravity of the centralizer is avoided, gas is shrunk by reducing the external temperature, then the disc spring pushes the outer pushing cylinder to reset, and the centralizer is made to move.

Description

technical field [0001] The invention relates to a casing straightening device and a straightening method for horizontal well completion, and belongs to the technical field of well cementing. Background technique [0002] Casing cementing and perforating completion is one of the important methods for horizontal well completion. However, at present, horizontal well cementing has the problems of casing eccentricity and poor centering in the horizontal section, and uneven thickness of the cement sheath formed after cementing, which is a serious problem. It affects the cementing quality of the horizontal well and the performance of the productivity advantage of the horizontal well. At present, the most effective way to improve the cementing quality of horizontal wells is to add a rigid centralizer to the casing in the horizontal section, but conventional rigid centralizers have the following disadvantages: the outer diameter is large, and it is difficult to run the casing; wall,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B17/10
CPCE21B17/1014E21B17/1078
Inventor 幸雪松袁俊亮范白涛孙翀吴怡李忠慧付兴胡棚杰
Owner CHINA NATIONAL OFFSHORE OIL (CHINA) CO LTD
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