casing centralizer

A technology of centralizer and casing, which is applied to casing, drill pipe, drilling equipment, etc., can solve the problems of limited centralizing effect, difficulty in centering the casing, and high risk, and achieves strong pressure bearing capacity and ensures the centering degree. , Improve the effect of cementing quality

Active Publication Date: 2016-03-09
PETROCHINA CO LTD
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Problems solved by technology

The currently used casing centralizers mainly include elastic centralizers and rigid centralizers, both of which have obvious shortcomings. The elastic centralizer has insufficient centralizing force, which makes it difficult to ensure the centering of the casing, and is easily damaged during the running process; The outer diameter of the rigid centralizer is close to the diameter of the wellbore, so there is a high risk of resistance and jamming during casing running, and limited by the open hole conditions, the centralizing effect is limited

Method used

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Embodiment Construction

[0010] Such as figure 1 As shown, the casing centralizer of the present invention mainly includes pipe body 1, centralizing block I2, centralizing block II3, centralizing block III4, centralizing block IV5, centralizing block V6, and centralizing block VI7. The six centralizing blocks have the same structure and are evenly distributed in Tube 1. Before work, the centralizing block is shrunk in the inner wall of the pipe body 1 to ensure the minimum outer diameter of the centralizer and avoid construction hidden dangers caused by the large outer diameter of the centralizer during casing running.

[0011] Such as figure 2 As shown, the above-mentioned centralizing blocks I-VI all include piston I21, piston II22, piston III23, piston seat 24, locking ring III25, locking ring II26, locking ring I27, shear nails I28, shear nails II29, and shear nails III30 , Piston cover 31. The piston seat 24 is connected with the pipe body 1 through threads, and the inner wall has a groove, a...

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Abstract

The invention relates to a casing centralizer which is composed of a casing body, a centralizing block I, a centralizing block II, a centralizing block III, a centralizing block IV, a centralizing block V and a centralizing block VI. The centralizing block I, the centralizing block II, the centralizing block III, the centralizing block IV, the centralizing block V and the centralizing block VI are identical in structure, each two centralizing blocks form a section in a symmetric manner, three sections are formed on the casing body from top to bottom, all sections sequentially rotate by 180 degrees and contract into the inner wall of the casing body, and each centralizing block is composed of a piston I, a piston II, a piston III, a piston seat, a locking ring III, a locking ring II, a locking ring I, a shear pin I, a shear pin II, a shear pin III and a piston cover. The casing centralizer is mainly applied to casing running and well cementing work of highly-deviated wells and horizontal wells.

Description

technical field [0001] The invention relates to a centralizer for well completion operations in oil and gas fields. Background technique [0002] At present, in the cementing process of highly deviated or horizontal wells, the casing centering degree is the key factor affecting the cementing quality. Connecting centralizers to the running strings is the most effective way to improve the casing centering degree. The currently used casing centralizers mainly include elastic centralizers and rigid centralizers, both of which have obvious shortcomings. The elastic centralizer has insufficient centralizing force, which makes it difficult to ensure the centering of the casing, and is easily damaged during the running process; The outer diameter of the rigid centralizer is close to the diameter of the wellbore, so there is a high risk of resistance and jamming during the casing running process, and is limited by the open hole conditions, so the centralizing effect is limited. Con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B17/10
Inventor 齐月魁王晓梅秦飞翔董建华李勇
Owner PETROCHINA CO LTD
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