Schlumberger Technology Corporation

Norman Ward

Lawrence C Lee

Olivier Sindt

Michael Shepherd

Robert Ian Robson

A skinned rotoror skinned statorof a progressive cavity apparatus is described. A rotorcan be skinned by threading a sleevewith a profiled helical outerand profiled helical innersurface onto a corewith a profiled helical outer surface. A rotor () can also be skinned by inserting a non-helical core () into a non-helical longitudinal bore () of a sleeve () with a profiled helical outer surface (). A statorcan be skinned by threading a tubular linerwith profiled helical innerand profiled helical outersurfaces into a profiled helical boreof a tube. A stator () can also be skinned by inserting a tubular liner () with a non-helical outer surface () into a non-helical bore () of a tube ().

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Gloucester, United Kingdom

Norman Ward