Casing centralizer

A technology of centralizer and casing, which is applied to casing, drill pipe, drilling equipment, etc., can solve the problems of low centering and difficulty in getting people, and achieve the effect of high centering.

Inactive Publication Date: 2014-11-19
SHAANXI QIYUAN TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The current centralizers all have the problem that the centering degree is not high, and due to the limitation of the outer diameter, it is difficult to lower the person

Method used

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  • Casing centralizer

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Embodiment Construction

[0011] The casing centralizer of the present invention includes a centralizing device, a backstop device, a hydraulic device and a main body 11. The centralizing mechanism is a centralizing spring piece 10, and the centralizing spring piece 10 is provided with 3 to 8 evenly axisymmetrically distributed supports. piece. The backstop device includes a spring 6 and a backstop hole 9 , the backstop hole 9 is arranged on the main body 11 , and a backstop pin 7 is also arranged in the backstop hole 9 . The hydraulic device includes an inner sealing ring 3, an outer sealing ring 4, a piston 5 and a hydraulic chamber 8. There are several spiral grooves on the outside of the hydraulic chamber 8. The piston 5 is in the shape of a hollow ring, and the piston 5 is sleeved on the main body. 11. The main body 11 is also provided with a hydraulic hole 2 . A casing collar 1 is connected to one end of the casing centralizer, and the characteristic is that the outer diameter of the casing cent...

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Abstract

The invention discloses a casing centralizer and relates to the field of petroleum machinery. The casing centralizer comprises a centering device, a stop device, a hydraulic device and a body. The casing centralizer is characterized in that the centering device refers to a spring piece, and 3-8 evenly, axially, symmetrically distributed support pieces are arranged on the centering spring piece. The casing centralizer has the advantages of safe tripping in, cyclone generation and high centering performance.

Description

technical field [0001] The invention relates to the field of petroleum machinery, in particular to casing centralizers. technical background [0002] According to statistics, more than 90% of shale gas horizontal wells use casing cementing, which is conducive to the stability of the well wall and the adoption of stimulation measures in the later stage. In order to improve the cementing quality, a centralizer is usually installed on the casing. Since shale absorbs water and expands, the borehole is prone to collapse and deformation, so the requirements for centralizers are more stringent. The current centralizers all have the problem of low centering, and the limitation of the outer diameter makes it difficult for people to get off. Contents of the invention [0003] In order to solve the above-mentioned problems, the present invention provides a casing centralizer capable of running in safely, generating swirling flow, and having relatively high centering performance. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B17/10
Inventor 张淑芬
Owner SHAANXI QIYUAN TECH DEV
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