Boring or penetrating the earth – With tool shaft detail – Shaft carried guide or protector
Patent
1979-10-29
1981-12-08
Leppink, James A.
Boring or penetrating the earth
With tool shaft detail
Shaft carried guide or protector
175410, 308 4A, E21C 900, F16C 126
Patent
active
043043119
ABSTRACT:
A drilling tool apparatus having easily released hard surface wear inserts for use in earth boring operations of the fixed blade stabilizer type is disclosed. Tungsten carbide inserts are preferably used on the wear surfaces of a fixed blade stabilizer and are formed where the tungsten carbide inserts may be released and dropped down the bore hole if it becomes necessary to free the stuck stabilizer by washover operations.
A method for easy release of wear resistant inserts as used in the wall contact surfaces of earth boring drill string stabilization tools is disclosed. The inserts are formed and placed in the stabilization tool wall contact surfaces in such a way that the inserts may be released and dropped downhole should it be necessary to washover the stuck drill string.
REFERENCES:
patent: 1045954 (1912-12-01), Decker
patent: 2657907 (1953-11-01), Cochran et al.
patent: 3285678 (1966-11-01), Garrett et al.
patent: 3311181 (1967-03-01), Fowler
patent: 3480094 (1969-11-01), Morris
patent: 4081203 (1978-03-01), Fuller
patent: 4190126 (1980-02-01), Kabashima
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