Well tool

Details Well tool Well tool

1979-06-18

1981-04-07

Novosad, Stephen J.

Boring or penetrating the earth

With below-ground tool drive prime mover

Fluid rotary type

175 40, 415502, E21B 402, F03B 1302, E21B 1202

Patent

active

042600308

ABSTRACT:
There is disclosed a turbodrill wherein excessive wear on the axial thrust bearing supporting the shaft from the housing is detectable at the surface by means of an increase in the back pressure of the drilling fluid circulating through the turbine section.

REFERENCES:
patent: 2626780 (1953-01-01), Ortloff
patent: 2967577 (1961-01-01), Tiraspolsky
patent: 3159222 (1964-12-01), Hammer et al.
patent: 3220244 (1965-11-01), Donnelly
patent: 3456746 (1969-07-01), Garrison et al.
patent: 3971450 (1976-07-01), Fox
patent: 4019591 (1977-04-01), Fox
patent: 4114704 (1978-09-01), Maurer et al.

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