Floating sub

Details Floating sub Floating sub

1988-08-19

1989-07-04

Novosad, Stephen J.

Boring or penetrating the earth

With tool drive prime mover or above-ground mechanical...

Rotary drive for a relatively advancing tool

175321, 267137, 464 20, E21B 1707, F16F 900

Patent

active

048441813

ABSTRACT:
A drill string is rotated by a top drive system and includes a floating sub which interconnects the upper end thereof with the drill pipe, and a bit at the lower end thereof. The bit is connected to the lower end of the drill pipe by means of a shock absorber. The floating sub prevents vibrational energy from the drill string from damaging the top drive system while the shock absorber prevents vibrational energy from damaging the bit and vice versa.

REFERENCES:
patent: 4055338 (1977-10-01), Dyer
patent: 4192155 (1980-03-01), Gray
patent: 4257245 (1981-03-01), Toelke et al.
patent: 4398898 (1983-08-01), Odom
patent: 4439167 (1984-03-01), Bishop et al.
patent: 4502552 (1985-03-01), Martini
patent: 4552230 (1985-11-01), Anderson et al.
patent: 4759738 (1988-07-01), Johnson

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