Center cable-passing check valve

Abstract

A central cable type check valve, including a sleeve and an insulating connection assembly assembled in the sleeve, a signal transmission assembly and a drilling fluid check assembly, the insulation connection assembly includes a plastic male joint, a line pipe and a plastic female joint, plastic The male connector and the plastic female connector are connected through a wire tube. The signal transmission component includes a conical stainless steel connector, a wire, a cylindrical stainless steel connector and a variable diameter spring. The wire passes through the wire tube and connects the conical stainless steel connector and the cylindrical stainless steel connector. The spring is installed in the cylindrical hole of the cylindrical stainless steel joint; the check assembly includes a valve sleeve, a valve core and a compression spring. The core fits tightly with the cone surface of the valve sleeve. Therefore, the central cable type check valve of the present invention can not only prevent the drilling fluid from flowing backward during the drilling process, but also realize two-way transmission of communication signals, and can effectively avoid signal transmission failures caused by poor contact, and the internal structure is accurately positioned , the backstop effect is remarkable.

Description

technical field [0001] The invention relates to the technical field, in particular to a central cable type check valve. Coal mine underground directional drilling supporting drilling tool, a central cable check valve, can be used for near-horizontal long-distance gas drainage drilling in coal mines, exploration and drainage drilling construction, and can also be used for ground and tunnel near-horizontal engineering drilling Such as directional drilling construction. Background technique [0002] Coal mine directional drilling technology is a new technology in the field of drilling engineering, which is mainly used in gas drainage drilling and geological exploration holes in rock formations and relatively stable and hard coal seams. Coal mine underground directional drilling technology working principle: the high-pressure drilling fluid is transferred to the bottom of the hole through the inner hole of the drill pipe for measuring while drilling, and the motor at the bottom...

AI Technical Summary

Problems solved by technology

However, during the construction of near-horizontal directional drilling, drilling upward along the coal seam or rock formation, the drilling fluid flows backwards through the inner hole of the drill pipe during the process of connecting the drill pipe, which seriously affects the drilling efficiency and the on-site operating environment

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