Spring-operated anti-stall tool

Details Spring-operated anti-stall tool Spring-operated anti-stall tool

2009-01-05

2010-12-21

Bagnell, David J (Department: 3676)

Boring or penetrating the earth

Processes

C175S027000, C175S321000

Reexamination Certificate

active

07854275

ABSTRACT:
An anti-stall tool in an oil well drilling assembly that controls reciprocation of the drill bit by a controller that alters weight-on-bit (WOB) depending upon measured downhole pressure or torque. The downhole controller keeps the drill bit rotating by maintaining WOB during normal drilling operations, increasing WOB if sensed working pressure indicates that drill bit loading or torque is undesirably low, and reversing WOB by applying a spring force for retracting the drill bit if excessive working pressure or torque is sensed.

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