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Elastic ball stabilizer

A technology of centralizer and ball, applied in drilling equipment, earthwork drilling, drill pipe, etc., can solve problems such as difficulty in running casing, and achieve the effect of simple structure, scientific design and reduced frictional resistance.

Inactive Publication Date: 2017-11-14
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide an elastic ball centralizer, which can well adapt to the change of well inclination angle, give enough elastic support to the casing, and better solve the difficult problem of casing running in the cementing process

Method used

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Embodiment Construction

[0032] The present invention will be further described below in conjunction with accompanying drawing.

[0033] In each fixing rib 1 of the present invention, a leaf spring 3 with a plurality of middle holes is arranged at a position close to the outer wall of the main body 2 of the centralizer.

[0034] Each ball 4 of the present invention corresponds to the middle hole of a leaf spring.

[0035] In the present invention, the hole surface of each middle hole is ground into a concave spherical surface matching with the ball 4 .

[0036] The leaf spring 3 of the present invention provides supporting force to each ball 4 .

[0037] The elastic coefficient of the leaf spring 3 used in the present invention is set according to the difference of the well inclination angle.

[0038] The calculation method of the elastic coefficient of leaf spring 3 among the present invention is mgsinθ-kx-ρ m gV=0.

[0039] The elastic coefficient set according to the different well inclination ...

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Abstract

The invention provides an elastic ball centralizer, which is mainly used to ensure the centering degree of the casing, reduce the running friction resistance of the casing, and improve the running smoothness of the casing. The fixing ribs are spirally arranged on the outer wall of the centralizer body to facilitate the rotation of the casing downhole. The centralizer includes a fixed rib, a centralizer body, leaf springs and balls. A leaf spring with multiple middle holes is arranged inside each fixed rib near the outer wall of the centralizer body to provide support for each ball. Each ball corresponds to a center hole. The hole surface of each middle hole is ground into a concave spherical surface consistent with the ball. The elastic coefficient of the leaf spring is set according to the different inclination angles to give the casing the best elastic support.

Description

technical field [0001] The invention provides a cementing tool, in particular an elastic ball centralizer used in casing operation. Background technique [0002] The centralizer is an important part in oil well cementing construction, mainly used to maintain the centering of the casing. Conventional centralizers are divided into two types, rigid centralizers and elastic centralizers. The friction mode between the two centralizers and the well wall is sliding friction, and the friction resistance is relatively large during the casing running process. [0003] In order to effectively solve the problem of large sliding frictional resistance, a roller centralizer appeared. However, these types of centralizers can only provide rigid support for the casing, which is not conducive to the safe and smooth passage of the casing string through the well section with severe dogleg. [0004] The elastic ball centralizer is developed on the basis of the elastic centralizer and the ball ...

Claims

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Application Information

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IPC IPC(8): E21B17/10
CPCE21B17/1042
Inventor 张杰李鑫李翠楠
Owner SOUTHWEST PETROLEUM UNIV
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