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Underground opening self-locking casing centering device

A self-locking, casing technology, which is applied in the direction of casing, drill pipe, drilling equipment, etc., can solve the problems of increasing the rigidity of the pipe string, high manufacturing cost, and high maximum starting force, so as to reduce the damage of the well wall and ensure the centering degree, the effect of low starting pressure

Active Publication Date: 2014-12-24
大庆恩博科技开发有限公司
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  • Abstract
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AI Technical Summary

Problems solved by technology

Disadvantages are: the rigid centering device has higher requirements on the wellbore and cannot have a reduced diameter well section
At the same time, the rigid centering device will increase the rigidity of the pipe string, making it difficult to run the casing, and the manufacturing cost is high, the manufacturing process is complicated, and the reliability is unstable, so its usage is subject to many restrictions
[0005] There is also an elastic centering device for downhole activation. Although it uses the pressure difference to open the spring leaf after it is lowered into the well, the bow-shaped spring leaf produces sufficient restoring force to play a centering effect, but the starting pressure of the centering device is relatively difficult. Control, the maximum starting force is higher, so it is less used

Method used

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  • Underground opening self-locking casing centering device
  • Underground opening self-locking casing centering device
  • Underground opening self-locking casing centering device

Examples

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Embodiment Construction

[0030] In order to make the present invention more comprehensible, preferred embodiments are described in detail below with accompanying drawings.

[0031] Such as figure 1 As shown, the present invention provides a downhole opening self-locking casing centering device, which includes a connection part 1 and a connection part 2 located at both ends, and a centering support part is provided between the connection part 1 and the connection part 2 3. The connection part 1 and the connection part 2 both adopt the thread structure connected with the casing, wherein the connection part 1 adopts LTC PIN thread, and the connection part 2 adopts LTC BOX thread.

[0032] The present invention is connected with the casing in the form of screw connection, which replaces the section collar and plays the role of linking the section collar. The problem of the position of the pipe string is avoided, and the problem of difficulty in running the casing caused by the rigidity of the rigid cente...

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Abstract

The invention relates to an underground opening self-locking casing centering device, which comprises a connecting part I and a connecting part II which are respectively located at both ends; a centering support part is arranged between the connecting part I and the connecting part II. The underground opening self-locking casing centering device is characterized in that the centering support part comprises a hollow connecting body; at least three N-stage piston-type self-locking support devices extending out stage by stage under the pressure action are evenly distributed in the circumferential direction of the connecting body, wherein V is not less than 2. The underground opening self-locking casing centering device disclosed by the invention has the advantages that 1, an integral structure of threaded connection is adopted; 2, an underground opening self-locking support structure is adopted; 3, by adopting a circular arc-shaped support cap, not only is a stronger support force ensured but also the damage to the wall of a well is reduced.

Description

technical field [0001] The invention relates to a centering device capable of centering and fixing a casing in a borehole. Background technique [0002] With the continuous development of the petroleum industry and the pursuit of high oil and gas reservoir productivity benefits, the requirements for cementing quality are getting higher and higher. The centering degree of casing in the wellbore is one of the decisive factors for the quality of oil and gas well cementing. . Therefore, how to accurately grasp the centering of the casing string in the well and how to improve the displacement efficiency in the process of cementing and injection are urgent problems to be solved in the oil field at present. The quality of cementing in the cementing process is determined by the displacement efficiency of cementing. The centering degree of the casing in the wellbore is an important factor affecting the cementing displacement efficiency. If the centering degree is poor, it is easy to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B19/24E21B17/10E21B23/01
CPCE21B17/1014
Inventor 夏庆华
Owner 大庆恩博科技开发有限公司
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