E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 44/00 (2006.01)
Patent
CA 2714899
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 at the downhole motor. The controller receives preset high and low working pressure limits for the downhole motor and 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 retracting the drill bit if excessive working pressure or torque is sensed.
La présente invention concerne un outil anti-calage utilisé dans un ensemble de forage de puits de pétrole qui contrôle le va-et-vient du trépan grâce à un contrôleur qui modifie le poids au trépan (WOB : weight-on-bit) en fonction du couple ou de la pression de fond mesuré au niveau du moteur de fond. Le contrôleur reçoit des limites supérieure et inférieure de pression de service prédéterminées pour le moteur de fond et assure la rotation du trépan en maintenant le WOB pendant les opérations de forage normales, augmente le WOB si la pression de service détectée indique que le couple ou le chargement du trépan est trop faible et inverse le WOB pour rétracter le trépan si un couple ou une pression de service trop important est détecté.
Krueger Rudolph Ernst
Mock Phillp Wayne
Fetherstonhaugh & Co.
Western Well Tool Inc.
LandOfFree
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