Well drilling tool

Details Well drilling tool Well drilling tool

1975-01-31

1976-07-27

Purser, Ernest R.

Boring or penetrating the earth

With below-ground tool drive prime mover

Fluid rotary type

175228, 175325, 277 87, 415502, E21B 312

Patent

active

039714500

ABSTRACT:
There are disclosed several embodiments of a well drilling tool which is adapted to be connected to the lower end of a drill string above the drill bit, and which comprises inner and outer members which are rotated with respect to one another by a motor between them.

REFERENCES:
patent: 2937008 (1960-05-01), Whittle
patent: 2990894 (1961-07-01), Mitchell et al.
patent: 3291230 (1966-12-01), Cullen et al.
patent: 3365202 (1968-01-01), Carleston
patent: 3540742 (1967-07-01), Tracy
patent: 3656565 (1972-04-01), Fox
patent: 3659662 (1972-05-01), Dicky
patent: 3762724 (1973-10-01), Porter
patent: 3807513 (1974-04-01), Kern et al.

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