Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent
1981-05-28
1982-07-27
Novosad, Stephen J.
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
175312, 175313, 175393, E21B 1018, E21B 1060, E21B 1206
Patent
active
043412734
ABSTRACT:
A jet rotary drill bit confirming a first strainer element allowing the passage of mud carrying small-sized particles, but preventing relatively coarse particles from passing to the jet nozzles. The first strainer element is self-cleaning and the relatively coarse particles are passed on to a second strainer on which they remain trapped.
REFERENCES:
patent: Re23416 (1951-10-01), Kinnear
patent: 1193468 (1916-08-01), Okell
patent: 2017834 (1935-10-01), Hummel
patent: 2066671 (1937-01-01), Catland
patent: 2549420 (1951-04-01), Camp
patent: 2562833 (1951-07-01), True
patent: 2708566 (1955-05-01), Caldwell
patent: 2760158 (1956-08-01), Yancey et al.
patent: 3131779 (1964-05-01), Rowley et al.
patent: 3329322 (1967-07-01), Neilson
Feenstra Robijn
Walker Bruce H.
Falk Joseph
Novosad Stephen J.
Shell Oil Company
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