Hole opener

Details Hole opener Hole opener

1986-02-18

1986-10-21

Novosad, Stephen J.

Boring or penetrating the earth

Bit or bit element

Magnetized or with magnet

175325, 175385, 175410, 175422R, E21B 728, E21B 1026, E21B 1056, E21B 1060

Patent

active

046180109

ABSTRACT:
A hole opener for use on drill strings in well bore enlargement operations featuring a bore follower extension and a stabilized cutter with poly crystalline diamond compact cutter elements arrayed in a plurality of cutting spiral patterns. Fluid jets are directed toward the cutter arrays and also directed to sweep the opener cut formation in groove regions between the cutter arrays. A hard metal chip covering is on the follower extension to open pilot hole bridges, assisted by a nose jet. Blade form vortex barriers are situated at the confluence of the cutter cleaning and formation sweeping fluid jets. The follower extension is tapered to increase the upward velocity of fluid rising past the extension.

REFERENCES:
patent: 2009742 (1935-07-01), Mitchell
patent: 3180439 (1965-04-01), Deely
patent: 3575247 (1971-04-01), Feenstra
patent: 3820611 (1974-06-01), King
patent: 4081203 (1978-03-01), Fuller
patent: 4273201 (1981-06-01), Garrett
patent: 4403668 (1983-09-01), Ramsey
patent: 4467879 (1984-08-01), Burge
patent: 4540055 (1985-09-01), Drummond et al.
patent: 4550790 (1985-11-01), Link

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