By-pass valve assembly

Abstract

The invention discloses a by-pass valve assembly, which pertains to the field of drilling machinery. The by-pass valve assembly comprises a valve body, a valve core arranged in the inner cavity of the valve body, a valve cover and a spring; more than one through hole is arranged on the valve core along the circumference; correspondingly, a sieve pore is arranged on the valve body, corresponding to the through hole of the valve core; the valve core is inserted into the valve cover and can move relatively to the valve cover; the pin end of the inner cavity of the valve body is provided with a hollow threaded connector which contacts with the end face of the valve cover and is used for fixing the valve body; the valve core is installed from the box end of the valve body, thereby reducing the diameter of the pin end of the inner cavity of the valve body; meanwhile, the threaded connector is adopted to compress the by-pass valve, substituting the existing spring flange structure, which causes the wall thickness of the pin of the by-pass valve to be increased, removes the dangerous section on which stress concentrates, increases the safety of the by-pass valve and prolongs service life.

Description

technical field [0001] The invention relates to drilling equipment, in particular to a bypass valve assembly. Background technique [0002] A large number of screw drilling tools are used in the oil and gas industry. The screw drilling tool is composed of four parts, which are bypass valve assembly, motor assembly, cardan shaft assembly and transmission shaft assembly. The bypass valve assembly is assembled on the top of the screw drilling tool. Its function is firstly to connect the drill collar or centralizer joint, and secondly, when the drilling mud flows through the inner hole of the bypass valve under pressure, the bypass valve core goes down and closes. , the mud is all used to drive the screw drilling tool to work and circulate; when the mud pump is closed, the bypass valve core is opened under the action of the spring, and the mud in the drilling tool passes through the sieve hole during the lifting process of the drilling tool Drain into the well. [0003] In th...

AI Technical Summary

Problems solved by technology

[0003] In the past, the valve core and valve sleeve of the bypass valve assembly were installed from the male buckle end of the lower end of the bypass valve body. The reliability of opening and closing, the aperture of the valve core and valve sleeve on the bypass valve body is limited. In order to ensure that the aperture in the valve body is thick enough, the wall thickness of the male buckle at the lower end of the bypass valve body will be smaller; In addition, the annular groove where the circlip is installed inside the valve body and the bottom of the pin thread adjacent to it form a dangerous section due to stress concentration. When the screw drilling tool works for a period of time, the aforementioned dangerous section will be damaged by stress Concentrated fatigue will reduce the strength of the valve body and even break, which will reduce the service life of the bypass valve assembly and directly increase the production cost

In actual use, the phenomenon that the screw drilling tool falls to the bottom of the well due to the breakage of the pin thread of the bypass valve body and the bottom of the thread has occurred in various production sites, which will directly affect production safety and reduce production efficiency

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