E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 44/00 (2006.01)
Patent
CA 2710187
An anti-stall tool in an oil well drilling assembly that controls reciprocation of the drill bit by 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.
La présente invention concerne un outil anti-calage 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. Le contrôleur de fond 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 malencontreusement faible et inverse le WOB par l'application d'une force de ressort pour rétracter le trépan si un couple ou une pression de service excessif est détecté.
Krueger Rudolph Ernst IV
Mock Philip Wayne
Fetherstonhaugh & Co.
Western Well Tool Inc.
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