Subsea drilling rig rope core drilling tool core inner tube overhauler

Abstract

The invention discloses a rock core inner tube salvager of a submarine drilling rig rope coring drilling tool. The rock core inner tube fisher of the submarine drilling rig rope coring drilling tool includes a salvage wire rope, an anti-clamping mechanism, a weight rod, a pressure rod, a fixed guide tube, a rotary core clamp sleeve and steel balls; the salvage wire rope is connected with the anti-clamping mechanism; the weight rod is fixed to the lower end of the anti-clamping mechanism, the pressure rod is fixed to the lower end of the weight rod and arranged in an inner cavity of the fixed guide tube, a plurality of pressure rod oblique teeth are arranged at the lower end of the pressure rod, and a guide groove is formed in the side surface of the pressure rod; a guide key is arranged onthe side wall of the inner cavity of the fixed guide tube, and the guide groove and the guide key form guide matching; the rotary core clamp sleeve is placed in the fixed guide tube, a steel ball seat is fixed to the bottom of the fixed guide tube, a plurality of steel ball holes are formed in the side wall of a circular column of the steel ball seat, and one steel ball is arranged in each steelball hole; and the rotary core clamp sleeve moves downwards to enable the steel balls to move towards the center of the circular column. According to the rock core inner tube fisher of the submarine drilling rig rope coring drilling tool, 'clamping' and 'releasing' can be extremely conveniently carried out on a rock core inner tube salvage spearhead, and the rock core inner tube fisher of the submarine drilling rig rope coring drilling tool further has the advantages of simple and compact structure and convenient handling.

Description

technical field [0001] The invention belongs to the field of wireline coring drilling tools, in particular to an overhauler for core inner tubes of a seabed drilling rig. Background technique [0002] Wireline coring technology has become an important development direction of land and seabed drilling rig coring technology because of its advantages such as short auxiliary operation time, high operation efficiency, good wall protection effect, and high core quality. The key device of the wireline coring technology is the wireline core drilling tool, which is mainly composed of two parts: the outer tube of the core drilling tool and the inner core tube placed inside the outer tube of the core drilling tool. After the second core drilling, it is necessary to drive the salvage winch or other auxiliary devices to lower the overshot to salvage the inner tube of the core. [0003] Patent CN104453765B discloses an overshot of a rope core drilling tool, the overshot of the rope core ...

AI Technical Summary

Problems solved by technology

[0004] At present, the existing wireline coring tool overhauler has a relatively complex structure, and it needs other auxiliary devices (such as mud pumps, valves, etc.) or manual auxiliary operations to complete the salvage operation of the inner tube of the core

However, for the subsea drilling rig, since the subsea drilling rig works on the seabed, it is impossible to manually go down to the seabed to perform manual auxiliary operations on the overshot, and a remote control operation method is required, which requires a very high degree of automation

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