Downhole screw motor

Details Downhole screw motor Downhole screw motor

E - Fixed Constructions

21

B

255/12

E21B 4/00 (2006.01)

Patent

CA 1250828

DOWNHOLE SCREW MOTOR Abstract A downhole screw motor is designed for drilling oil and gas wells. A downhole screw motor has a stator and a hollow rotor having an axial passage in which is mounted a flow regulat- or having a nozzle. The surface of the nozzle washed with working liquid is made up of two chambers disposed in series in the flow direction: an admission chamber and a delivery chamber, the surfaces of the chambers being conjugated along a break line. A portion of the admission chamber, which is adjacent to the break line, is convex with respect to the direction of flow of working liquid, and the cross-sectional area of the admission chamber at the outlet thereof is smal- ler than the cross-sectional area of the same chamber at the inlet thereof.

501759

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