Apparatus for controlling a downhole drilling motor assembly

Details Apparatus for controlling a downhole drilling motor assembly Apparatus for controlling a downhole drilling motor assembly

E - Fixed Constructions

21

B

E21B 4/00 (2006.01)

Patent

CA 2446097

An apparatus for controlling a downhole drilling motor assembly includes a tubular housing having an interior sidewall which defines an interior bore. A mandrel is rotatably mounted within the interior bore of the housing. The mandrel has an exterior surface. A hydraulic dampener assembly is disposed between the interior sidewall of the housing and the exterior surface of the mandrel. The hydraulic dampener assembly limits the rate of rotation of the mandrel within the housing, thereby providing a preset resistance to reactive torque. The described apparatus can also be used as a steering tool by the addition of a feature that selectively blocks the flow of hydraulic fluids through the hydraulic dampener, thereby locking the mandrel in a selected directional position.

L'invention concerne un appareil pour commander l'assemblage d'un moteur de forage de fond, ledit appareil comprenant une paroi latérale intérieure définissant un alésage intérieur. Un mandrin est fixé de manière rotative dans l'alésage intérieur du boîtier. Le mandrin comporte une surface extérieure. Un ensemble de mouillage hydraulique est placé entre la paroi latérale intérieure et la surface extérieure de la surface du mandrin. L'ensemble de mouillage hydraulique régularise la cadence de rotation du mandrin dans le boîtier, assurant ainsi une résistance préréglée au couple réactif. L'appareil en question peut également servir d'outil de direction par l'ajout d'une fonction qui bloque sélectivement l'écoulement de fluides hydraulique à travers le mouilleur hydraulique, ce qui bloque le mandrin dans une position directionnelle sélectionnée.

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