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A double-layer composite casing with mismatched strength

A combined casing and casing technology, applied in casing, drill pipe, drill pipe, etc., can solve the problems of inability to carry out oil production projects, lack of research results of material strength matching, and complicated construction, so as to reduce the risk of plastic deformation failure , reduce the risk of plastic deformation failure, improve the effect of anti-extrusion performance

Active Publication Date: 2021-09-28
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Double-layer composite casing is an important means of early casing protection. At present, most double-layer composite casings use the method of injecting cement between the inner and outer casings, which can improve the collapse resistance of the casing. In large areas, the extrusion force of the formation is directly transmitted to the inner casing through the outer casing and the cement sheath, causing damage to the inner casing, resulting in the failure of the oil production project, and the construction is complicated and difficult to operate; at the same time, the existing The double-layer composite casing has no research results on the material strength matching of the inner and outer casings, and the performance of the casings is uneven

Method used

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  • A double-layer composite casing with mismatched strength

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Embodiment

[0020] Such as figure 1 As shown in the structure, the external threaded joint 1 and the internal threaded joint 2 are casing collars with an outer diameter of 153.7mm, the outer casing 3 adopts a 139.7*6.20mm N80 casing, and the inner layer casing 4 adopts a 114.3*6.35mm P110 casing,

[0021] The material strength of the outer casing 3 is 80ksi, the material strength of the inner casing 4 is 110ksi, and the material strength of the outer casing 3 is 72.7% of the material strength of the inner casing 4; 139.7*6.20mm N80 outer layer The material elongation of the sleeve 3 is 22%.

[0022] The outer casing 3 has a wall thickness of 6.20mm and an inner diameter of 127.3mm; the inner casing has an outer diameter of 114.3mm and a wall thickness of 6.35mm.

[0023] The surface of the inner casing has a layer of Cr coating with a thickness of 30-50μm, and the hardness of the coating is HRC58.

[0024] The annular gap between the outer casing 3 and the inner casing 4 is 6.5mm, and ...

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Abstract

The invention discloses a strength-mismatched double-layer composite casing, which includes an external threaded joint, an internal threaded joint, an outer layer casing and an inner layer casing, wherein the outer layer casing and the inner layer casing adopt different strength grades material; after the outer casing is plastically deformed and in contact with the inner casing, since the stiffness of the inner casing is much greater than that of the outer casing, and there is a coating with a small friction coefficient on the outer wall of the inner casing, the With the anti-friction effect of the lubricating fluid, under the action of the external extrusion force, the outer casing will undergo metal plastic flow deformation along the outer wall of the inner casing, absorb part of the external extrusion load, reduce the external extrusion load borne by the inner casing, and effectively improve The anti-extrusion performance of the double-layer composite casing reduces and reduces the risk of plastic deformation failure of the inner layer casing, and is suitable for the deformation area of ​​the conventional casing caused by non-uniform load.

Description

technical field [0001] The invention belongs to the technical field of casing for oil and gas development, and in particular relates to a double-layer composite casing with strength mismatch. Background technique [0002] With the deepening of the production and development of various oilfields at home and abroad, casing damages of varying degrees have occurred in most oilfields, which has caused a great impact on oil production and development. Double-layer composite casing is an important means of early casing protection. At present, most double-layer composite casings use the method of injecting cement between the inner and outer casings, which can improve the collapse resistance of the casing. In large areas, the extrusion force of the formation is directly transmitted to the inner casing through the outer casing and the cement sheath, causing damage to the inner casing, resulting in the failure of the oil production project, and the construction is complicated and diffi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B17/00E21B17/08
CPCE21B17/00E21B17/08
Inventor 刘永刚李方坡韩礼红杨尚谕韩军潘志勇
Owner BC P INC CHINA NAT PETROLEUM CORP
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