| 摘要 |
An anti-stall tool in an oil well drilling assembly that controls reciprocation of the drill bit by an electrical controller that alters weight-on-bit (WOB) depending upon measured downhole pressure or torque at the downhole motor. 5 The electrical controller receives preset high and low working pressure limits for the downhole motor and activates a hydraulic valve system to keep 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 retracting the drill bit if excessive working pressure or 10 torque is sensed. Inventor(s): Philip Wayne Mock Title: Electrical Controller for Anti-Staff Tools for Downhole Drilling Assemblies Sheet 1 /8 CN < CNQ//N 0/ CNN' DO KNp |
