Downhole shearers

Details Downhole shearers Downhole shearers

1980-04-24

1982-12-07

Pate, III, William F.

Boring or penetrating the earth

Bit or bit element

Casing shoe type

175171, 175257, E21B 1026

Patent

active

043622178

ABSTRACT:
The present specification describes and claims a downhole casing shearer for use in drilling bore holes. The casing shearer comprises an elongate, generally cylindrical sub-member which is connected between a drilling bit and a drill rod string and which engages within a hollow cylindrical shearer, the trailing end of the shearer being connected to a conventional bore hole liner, so that the shearer may rotate about its longitudinal axis with the liner stationary. The sub-member and shearer are interlocked by a releasable locking mechanism which prevents relative rotation therebetween but which allows both for the axial drilling pressure to be applied to the shearer and the shearer to be lifted, and for the drilling bit, sub-member and rod string to be lifted through the liner leaving the shearer and liner in the bore hole, when the locking mechanism is released.

REFERENCES:
patent: 2764388 (1956-09-01), Camp
patent: 2771275 (1955-11-01), Ortloff
patent: 3169591 (1965-02-01), Worthington et al.
patent: 3346059 (1967-10-01), Svendsen
patent: 3447340 (1969-06-01), Garrett
patent: 3965996 (1976-06-01), Gross

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