Method for raising and lowering a drill string in a wellbore dur

Details Method for raising and lowering a drill string in a wellbore dur Method for raising and lowering a drill string in a wellbore dur

1984-11-06

1987-03-03

Novosad, Stephen J.

Boring or penetrating the earth

Processes

Boring curved or redirected bores

175 65, 175 73, E21B 704

Patent

active

046468552

ABSTRACT:
A rotary well drilling system employs a drill pipe with a drill bit affixed at its lower end for the drilling of a wellbore. Drilling fluid is circulated through the drill pipe to remove drill cuttings. When raising and lowering the drill pipe in the wellbore, the drill pipe is continuously rotated along with continued drilling fluid circulation to prevent sticking of the drill pipe. The drill bit is rotated by a mud motor in the opposite direction from that of the drill pipe and at the same speed so that the drill bit remains rotationally stationary with respect to the wellbore and does not side-track as it is dragged along the lower side of the wellbore wall when being raised or lowered in an inclined wellbore.

REFERENCES:
patent: Re29526 (1978-01-01), Jeter
patent: 3260318 (1966-06-01), Neilson et al.
patent: 3667556 (1972-06-01), Henderson
patent: 3841420 (1974-10-01), Russell
patent: 4143722 (1979-03-01), Driver
patent: 4485879 (1984-12-01), Kamp et al.
patent: 4492276 (1985-01-01), Kamp

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