A plunger type centralizer with large variable diameter

Abstract

The invention relates to a large plunger type reducing centralizer for directional drilling of a large-size well section. The centralizer solves the problem of high trip frequency of a directional drilling technology of the large-size well section. The invention adopts the technical scheme that the upper part of a main barrel is in threaded connection with an upper connector; the lower part of the main barrel is in threaded connection with a lower connector; six plungers are mounted on a plunger seat; six plunger holes are axially formed in a stepped surface of the main barrel; the six plungers are arranged in the six plunger holes respectively; six through holes are radially formed in the main barrel; six centralizing cylinders and six centralizing cylinder mandrels are mounted in the six radial through holes of the main barrel respectively; a centralizing body is fixedly connected with the two centralizing cylinders in the same phase circumferentially with screws a; one end of an upper connecting rod is articulated with an upper sliding sleeve; the other end of the upper connecting rod is articulated with the upper end of the centralizing body; one end of a lower connecting rod is articulated with a lower sliding sleeve; the other end of the lower connecting rod is articulated with the lower end of the centralizing body; and the main barrel is internally provided with six oil inlet runners. three oil drain runners and six well drilling fluid branch runners. The centralizer is large in reducing scope and reliable in structure.

Description

technical field [0001] The invention relates to a plunger type large-diameter centralizer used for directional drilling of large-scale well section. Background technique [0002] With the development of the petroleum industry, more and more oil and gas reservoirs are developed using directional drilling technology. Using directional drilling technology can economically and effectively develop oil and gas resources with limited surface and underground conditions, and can greatly increase oil and gas production capacity. It is beneficial to protect the natural environment and has significant economic and social benefits. [0003] In directional drilling technology, deflection build-up, deflection stabilization and deflection reduction are the main technological processes. In engineering, drilling tools are tripped and drilling tool assemblies are changed to realize this process. The centralizer is the core part of the drilling tool assembly, and it will consume a lot of time ...

AI Technical Summary

Problems solved by technology

The centralizer is the core part of the drilling tool assembly, and it will consume a lot of time and economic cost to install different centralizers every time the drilling tool is pulled out

In recent years, in deep and ultra-deep wells, large-scale well sections have become longer and larger, and the size of centralizers has also become larger and larger. Compared with conventional well sections, the process of using directional drilling technology in large-scale well sections is more complicated

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