A wedge type hydraulic centralizer

Abstract

The invention provides a wedge-type hydraulic centralizer, which includes a centralizing system and a power system. The centralizing system includes a fixed sleeve, a second-level centralizing block A, a first-level centralizing block, a second-level centralizing block B and a sliding block connected sequentially. , the contact surface between the fixed sleeve and the second-level centralizing block A is inclined plane I, the second-level centralizing block A can slide along the inclined plane I, the angle α between the inclined plane I and the axial direction is less than 90 degrees, and the second-level centralizing block A The contact surface between the block A and the first-level centralizing block is inclined plane II, which can slide mutually along the inclined plane II. The angle β between the inclined plane II and the axial direction is less than 90 degrees. A. The fixed sleeve is arranged symmetrically along the center line of the first-stage centralizing block, and the power system can push the sliding block to move axially. The beneficial effects of the present invention are: the structure does not increase the outer diameter of the pipe string when entering the well, and is easy to run the pipe string into. After the pipe string is in place, the pipe string is centered by hydraulic thrust and the cementing quality is improved.

Description

technical field [0001] The invention belongs to the field of oil drilling, in particular to a wedge-type hydraulic centralizer. Background technique [0002] In the prior art, commonly used casing centralizers mainly include elastic centralizers and rigid centralizers. In horizontal wells and highly deviated wells, due to the heavy pipe string, the elastic steel sheet of the elastic centralizer is easily deformed, and the centralizing effect is not good. Rigid centralizers (including roller centralizers) increase the outer diameter of the entire pipe string, making it difficult to run the pipe string. If the experience conditions are not ideal, it is easy to cause obstacles. In horizontal wells and high-inclination wells, since the centralizer is always attached to the well wall during the running process and scrapes the wellbore, it is easy to cause mud and sand to accumulate, making it impossible to start the pump. In the "sugar gourd" and "big belly" well sections, the...

AI Technical Summary

Problems solved by technology

In horizontal wells and highly deviated wells, due to the heavy pipe string, the elastic steel sheet of the elastic centralizer is easily deformed, and the centralizing effect is not good

Rigid centralizers (including roller centralizers) increase the outer diameter of the entire pipe string, making it difficult to run the pipe string

If the experience conditions are not ideal, it is easy to cause obstacles

In horizontal wells and high-inclination wells, since the centralizer is always attached to the well wall during the running process and scrapes the wellbore, it is easy to cause mud and sand to accumulate, making it impossible to start the pump

In the "sugar gourd" and "big belly" well sections, these two centralizers are even more unable to play a centralizing role

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