A core tube check valve mechanism of a wireline coring tool

Abstract

A core tube one-way valve mechanism for a cable coring drilling tool, including a core tube joint, a thrust sleeve, a liftable valve seat, a cylindrical pin and a steel ball; The drain hole vertically penetrates through the hole, and the thrust sleeve is set outside the core pipe joint, and two cylindrical pin avoidance holes are symmetrically arranged in the middle of the side wall of the core pipe joint; the thrust sleeve is a cylindrical sleeve, and the thrust sleeve is equipped with Install cylindrical pins; the liftable valve seat is a casing with a conical closure at the lower end, placed in the inner hole of the core pipe joint, and can move up and down in the axial direction, and is set on the side wall of the liftable valve seat The axial long hole, when the liftable valve seat is in the lower position, the axial long hole communicates with the drain hole at the lower part of the core pipe joint; the steel ball is placed in the movable valve seat. The invention achieves the purpose of ensuring the quality and recovery rate of the rock core and improving the work efficiency through the optimal design of the structure of each component part and its matching relationship.

Description

technical field [0001] The invention relates to a wireline coring drill, in particular to a core tube check valve mechanism of the wireline coring drill. Background technique [0002] Ultra-deep scientific drilling is a scientific exploration activity for geological research by taking cores from ultra-deep holes and reusing the obtained cores. In order to improve the efficiency of coring drilling, the quality of core collection and reduce drilling costs, most of Wireline core drilling process. [0003] In the wireline coring drilling process, when the core enters the core tube, the flushing fluid inside the core tube needs to be removed through the one-way valve. When the inner tube is salvaged, the one-way valve is closed to prevent the flushing fluid from eroding the core in the tube. Therefore, a core tube check valve mechanism is provided in the wireline coring tool. In the prior art, the one-way valve mechanism of the core tube adopts the method of cooperating with th...

AI Technical Summary

Problems solved by technology

Since the internal taper between the valve seat and the steel ball in the above-mentioned core tube check valve mechanism is relatively small, and in order to facilitate the core out operation on the surface, generally a small inclination angle of the drilling tool in the vertical direction is maintained. At this time, the steel ball and the fixed ball seat are still in a bonded state, causing negative pressure inside the core tube, increasing the difficulty of core extraction and working time, and reducing work efficiency

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