Abstract: The stator, rotor and/or flex shaft of a progressive cavity pump is made up of composite materials, e.g., fiberglass and resin, in a variety of combinations with and without bonded resilient elastomers. The composites are formulated to provide resiliency and non-resiliency where needed. The flex shaft between the rotary power source and the rotor is made of composite materials and designed to absorb the orbital and gyrational movement of the rotor.

Abstract: A downhole submersible fluid pump having a progressive cavity motor section and a progressive cavity pump section. In each section the rotor is fixed and the pumping action occurs by forcing power fluid into the motor chamber around the rotor which action causes the normally fixed stator to rotate around relative to the fixed rotor. This rotary motion is transmitted via the housing to the pump stator formed internally thereof which rotates relative to another fixed rotor drawing fluids from the subterranean formation upwardly as produced fluids.