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Self-adaptive casing centralizer and righting method

A self-adapting, centralizer technology, applied in casing, drill pipe, earthwork drilling, etc., can solve problems such as affecting casing running ability, poor casing centering effect, complex centralizer structure, etc., to reduce the risk of obstruction , Improve the effect of centering degree and uniform annular gap of wellbore

Pending Publication Date: 2019-12-13
潍坊市宇宏石油机械有限公司
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AI Technical Summary

Problems solved by technology

[0004] The above-mentioned casing centralizers can effectively adapt to different wellbore diameters, but this type of centralizer has a large size and poor self-adaptive ability, which may easily cause obstruction or cementing quality in complicated wellbore casings during lowering. The poor problem affects the lowering ability of the casing, and the casing centering effect is poor, which greatly affects the cementing quality, and the structure of this type of centralizer is complicated, the manufacturing process is cumbersome, and the manufacturing cost is seriously increased

Method used

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  • Self-adaptive casing centralizer and righting method
  • Self-adaptive casing centralizer and righting method
  • Self-adaptive casing centralizer and righting method

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Embodiment

[0034] Example: such as Figure 1-4 An adaptive casing centralizer includes a main body 1, and the main body 1 is provided with a plurality of self-adaptive expansion components capable of automatically expanding under pressure and automatically adapting to the borehole diameter to centralize and fix the casing.

[0035] The overall structure of the main body 1 is a hollow cylindrical structure, and a through hole is arranged inside, and the inner diameter of the through hole is consistent with the inner diameter of the sleeve to be matched.

[0036] The two ends of the main body 1 are respectively provided with sleeve thread buckles 5 for conveniently connecting sleeves.

[0037] The thread section of the casing threaded button 5 is a conical thread.

[0038] Bosses 6 are respectively arranged on the tails of the casing threads 5 on the main body 1, and the bosses 6 are used to position the casing when the main body 1 is connected to the casing.

[0039] A plurality of step...

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Abstract

The invention discloses a self-adaptive casing centralizer and a righting method. The self-adaptive casing centralizer comprises a body. A plurality of self-adaptive expansion assemblies capable of being automatically expanded by pressure to automatically adapt to the diameter of a well to right and fix a casing are arranged on the body. Each self-adaptive expansion assembly comprises a bellows arranged in a stepped through-hole slot. The cross section of each bellows is in a wavy shape. The self-adaptive casing centralizer is simple in whole structure and convenient to operate and can adapt to different well diameters, the casing is effectively righted and fixed, and the well cementing quality is improved; the overall outer diameter of the body of the self-adaptive casing centralizer is smaller than the well diameter of a wellbore when the body of the self-adaptive casing centralizer is in an initial state, the centralizer can smoothly enter the well, the risk of encountering resistance is reduced, the well wall is not damaged, the bellows can uniformly expand, the supporting force is improved, the casing is effectively righted, and the centering degree of a casing column is increased; and after centering of the casing is completed, the wellbore annular clearance is uniform, the well cementing quality can be effectively improved, and the whole construction is easy and convenient.

Description

technical field [0001] The invention relates to a casing centralizer and a centralizing method, in particular to a self-adaptive casing with simple structure, convenient operation, adaptability to different well diameters, effective centralization and fixing of the casing, and improvement of cementing quality A centralizer belongs to the technical field of oil and gas drilling and completion. Background technique [0002] The casing centralizer is one of the important devices commonly used in the field of oil and gas drilling. Its function is to make the casing live in the center of the wellbore, ensure the centering of the downhole casing, and improve the cementing quality. [0003] Existing traditional centralizers mainly include elastic centralizers and fixed centralizers. For example, the patent number is: 201520678554.7 discloses an adaptive casing centralizer, which includes a main body with a cylindrical structure, and an annular hollow is arranged in the side wall of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B17/10E21B33/13
CPCE21B17/1078E21B17/1014E21B33/13
Inventor 于海洋张文起王海龙
Owner 潍坊市宇宏石油机械有限公司
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