Steerable rotary drilling systems

Details Steerable rotary drilling systems Steerable rotary drilling systems

1992-06-22

1993-11-30

Dang, Hoang C.

Boring or penetrating the earth

With signaling, indicating, testing or measuring

Tool position direction or inclination measuring or...

175 61, 175 73, E21B 4702

Patent

active

052656829

ABSTRACT:
A system for maintaining a downhole instrumentation package in a roll stabilised orientation with respect to a drill string comprises an instrument carrier which is mounted within a drill collar for rotation about the longitudinal axis of the collar. An impeller is mounted on the instrument carrier so as to rotate the carrier relatively to the drill collar as a result of the flow of drilling fluid along the drill collar during drilling. The torque transmitted to the instrument carrier is controlled, in response to signals from sensors in the carrier which respond to the rotational orientation of the carrier, and input signals indicating the required roll angle of the carrier, so as to rotate the carrier in the opposite direction to the drill collar and at the same speed, so as to maintain the carrier non-rotating in space and hence roll stabilised. The torque may be controlled by controlling a variable coupling between the impeller and the carrier and/or by controlling a brake between the carrier and the drill collar.

REFERENCES:
patent: 3637032 (1972-01-01), Jeter
patent: 4040494 (1977-08-01), Kellner
patent: 4291773 (1981-09-01), Evans
patent: 4637479 (1987-01-01), Leising
patent: 4714118 (1987-12-01), Baker et al.
patent: 4836301 (1989-06-01), Van Dongen et al.

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