Core tube one-way valve mechanism of rope coring drilling tool

Abstract

The invention discloses a core tube one-way valve mechanism of a rope coring drilling tool. The mechanism comprises a core tube joint, a thrust sleeve, a liftable valve seat, a cylindrical pin and a steel ball; the core pipe joint is provided with an inner hole which communicates vertically and a liquid discharge hole which vertically communicates with the inner hole, the thrust sleeve is arrangedoutside the core tube joint in a sleeving mode, and two cylindrical pin avoiding holes are symmetrically arranged in the middle of the side wall of the core tube joint; the thrust sleeve is a cylindrical sleeve, and a cylindrical pin is assembled on the thrust sleeve; the liftable valve seat is a sleeve, the lower end of the liftable valve seat is provided with a conical closing opening, the liftable valve seat is arranged in the inner hole of the core tube joint and can axially move vertically, an axial long hole is arranged on the side wall of the liftable valve seat, and when the liftablevalve seat is in a lower position, the axial long hole communicates with the liquid discharge hole at the lower part of the core tube joint; and the steel ball is placed in a movable valve seat. According to the mechanism, through the optimized design of a structure of each component part and the matching relation thereof, the purposes of ensuring the quality and the adoption rate of a rock core and improving the working efficiency are achieved.

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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