Drilling method

Details Drilling method Drilling method

1977-05-09

1979-02-06

Novosad, Stephen J.

Boring or penetrating the earth

Processes

Boring with specific fluid

175106, 175107, E21B 312

Patent

active

041379756

ABSTRACT:
A pump is installed in a drill string above the bit and both the bit and pump are connected to the outputs of a differential gearing located therebetween. The circulation of drilling fluids is the reverse from the conventional and by operating a valve in the drill string the torque applied to the bit and pump can be controlled. Useful for drilling weak formations.

REFERENCES:
patent: 1412430 (1922-04-01), Verneuil
patent: 2815934 (1957-12-01), Collins
patent: 2898087 (1959-08-01), Clark
patent: 2984309 (1961-05-01), Welchon
patent: 3077358 (1963-02-01), Costa
patent: 3112801 (1963-12-01), Clark et al.
patent: 3695370 (1972-10-01), Jones
patent: 3732143 (1973-05-01), Joosse
patent: 3823788 (1974-07-01), Garrison et al.
patent: 3999901 (1976-12-01), Tschirky

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