Wedging type hydraulic centering device
A centralizer and wedge-type technology, which is applied in the direction of drilling equipment, earthwork drilling, drilling pipes, etc., can solve problems such as resistance, difficulty in running pipe strings, and poor centralization effect, so as to achieve easy running and improve solidification. The effect of well quality
Active Publication Date: 2016-01-06
BC P INC CHINA NAT PETROLEUM CORP +1
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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
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[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0028] In the following description, a lot of specific details are set forth in order to fully understand the present invention, but the present invention can also be implemented in other ways different from those described here, and those skilled in the art can do it without departing from the meaning of the present invention. By analogy, the present invention is therefore not limited to the specific examples disclosed below.
[0029] Secondly, the present in...
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The invention provides a wedging type hydraulic centering device which comprises a centering system and a power system. The centering system comprises a fixed sleeve, a second-level centering block A, a first-level centering block, a second-level centering block B and a sliding block which are sequentially connected. The contact face between the fixed sleeve and the second-level centering block A is a first inclined face. The second-level centering block A can slide along the first inclined face. The angle alpha between the first inclined face and the axial direction is smaller than 90 degrees. The contact face between the second-level centering block A and the first-level centering block is a second inclined face, and the second-level centering block A and the first-level centering block can slide relative to each other along the second inclined face. The angle beta between the second incline face and the axial direction is smaller than 90 degrees. The second-level centering block B, the sliding block, the second-level centering block A and the fixed sleeve are symmetrically arranged along the center line of the first-level centering block. The power system can push the sliding block to move in the axial direction. The wedging type hydraulic centering device has the advantages that the outer diameter of a pipe string is not increased when the device enters a well to facilitate tripping-in of the pipe string, the pipe string is centered through hydraulic push force after being put in place, and the well cementation 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...
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IPC IPC(8): E21B17/10
Inventor 蒋本强刘超韩振强张京华蒋世伟曹博古青祝平付家文徐正兴
Owner BC P INC CHINA NAT PETROLEUM CORP