Downhole motor fluid flow restrictor

Details Downhole motor fluid flow restrictor Downhole motor fluid flow restrictor

E - Fixed Constructions

21

B

255/12

E21B 4/02 (2006.01) E21B 4/00 (2006.01) F03B 13/02 (2006.01) F16C 33/66 (2006.01)

Patent

CA 1223863

DOWNHOLE MOTOR FLUID FLOW RESTRICTOR Abstract of the Invention A downhole drilling motor located near the end of a rotary drill string is powered by the drilling fluid for driving a rotary drill bit for the drilling of an oil or gas well or the like. Substantially all of the drilling fluid that exits the power producing section is channeled toward the nozzles of the drill bit with a small portion being diverted through the bearings of the motor. A series of elastomer flow restrictor elements, each responding to increased fluid pressure by reducing the flow area therethrough, controls the fluid flow through the bearings to within a narrow range of flow rates.

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