Novel hydraulic centralizer

Abstract

The invention provides a novel hydraulic centralizer. The centralizer comprises an outer cylinder, the middle of the outer cylinder protrudes outwards, and a mounting groove is formed in the outer side of the protrusion. A first-stage piston is mounted in the mounting groove, and a second-stage piston and a third-stage piston are sequentially fixed to the outer side of the first-stage piston in asleeving manner; the first-stage piston, the second-stage piston and the third-stage piston are all telescopic pistons and can be bounced off in a stepped mode under the action of pressure. A centralizing ring fixedly connected with the third-stage piston is arranged on the outer side of the third-stage piston; a sealing connector is arranged in the outer cylinder, through holes are formed in themounting groove and the sealing connector, lug-free check rings for shafts are arranged between the first-stage piston and the second-stage piston and between the second-stage piston and the third-stage piston respectively, and sealing rings are arranged between the first-stage piston and the second-stage piston and between the second-stage piston and the third-stage piston respectively. The novelhydraulic centralizer is simple in structure, convenient to use, small in centralizer outer diameter and easy to enter a well.

Description

technical field [0001] The invention relates to a centralizer, in particular to a novel hydraulic centralizer. Background technique [0002] The centralizer is a cementing tool. It is simple to manufacture, beautiful in structure, durable and strong in centralizing force. In horizontal wells, due to gravity, the casing is biased toward the lower end of the wellbore, so that the cement sheath at the lower end of the casing is very thin, or even there is no cement sheath, and the cementing quality in this place is not good. In order to improve the cementing quality, traditional centralizers, such as rigid and elastic centralizers, cannot solve this problem well. Contents of the invention [0003] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a new type of hydraulic centralizer, which has a compact structure, is easy to operate, has a small outer diameter of the centralizer, and is easy to enter the well. [0004] In order to ac...

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Problems solved by technology

[0002] The centralizer is a cementing tool. It is simple to manufacture, beautiful in structure, durable, and has a large centralizing force. It overcomes the shortcomings of the original welded centralizer that is prone to desoldering.

In horizontal wells, due to gravity, the casing is biased toward the lower end of the wellbore, so that the cement sheath at the lower end of the casing is very thin, or even there is no cement sheath, and the cementing quality in this place is not good

In order to improve the cementing quality, traditional centralizers, such as rigid and elastic centralizers, cannot solve this problem well

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