Mechanically actuated fluid control device for downhole fluid motor
OwnerPaul A. Reinhardtinventor
Life of this patent
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Abstract
Apparatus is disclosed for controlling the power supplied to a drill bit by a downhole fluid powered motor to prevent the motor from rotating the bit at high speeds when there is little or no weight in the bit while maintaining full circulation through the fit. Apparatus also disclosed for restricting the flow of drilling fluid of the drill pipe when circulation is fully or partially lost.
Claims13
A downhole drilling assembly comprising a fluid powered motor having a rotor and a stator and a stator/rotor annulus, the rotor being rotated relative to the stator by drilling fluid pumped through the stator/rotor annulus, tubular torque transmitting means connected to the rotor for rotation therewith and through which drilling fluid can bypass the stator/rotor annulus, a bypass port in the tubular torque transmitting means below the motor through which fluid flowing through the stator/rotor annulus can enter the tubular torque transmitting means, a drill bit having a port through which the drilling fluid can flow out of the drilling assembly and connected to the rotor for rotation therewith, means for restricting the flow of drilling fluid through the tubular bypass means when the weight on the bit is sufficient to provide enough resistance to rotation to keep the speed of the rotor within acceptable limits, and means for opening the flow of drilling fluid through the tubular bypass to thereby reduce the flow of drilling fluid through the stator/rotor annulus when the weight in the bit is insufficient to keep the speed of the rotor within acceptable limits.
A downhole drilling assembly comprising a fluid powered motor having a rotor and a stator, the rotor being rotated relative to the stator by drilling fluid pumped through the stator/rotor annulus, a drill bit connected to the rotor for rotation therewith, said drill bit having a port through which the drilling fluid can flow out of the drilling assembly, a tubular torque transmitting means including a fluid restrictor means connected to the rotor for rotation therewith, a port in the tubular torque transmitting means below the motor through which fluid flowing through the stator/rotor annulus can enter the tubular torque transmitting means, means for allowing the flow of drilling fluid through tubular torque transmitting means when the weight on the bit is sufficient to open the restriction means to allow flow to pass through the rotor and stator to cause rotation of the drill bit, and means for closing the flow of drilling fluid through the bypass means to thereby prevent the flow of drilling fluid through the stator/rotor annulus when the weight on the bit is insufficient to keep the restrictor open to the flow of fluid.
Dependencies are inferred from the claim text.