Flexible tubing production system for well installation

Claim 1

A pumping system for producing formation fluid from a well comprising, in combination: a submersible pump having a power fluid reservoir, a housing enclosing a hydraulic power cylinder and a production cylinder; a hydraulic power pump mounted in said housing having an inlet port in communication with the power fluid reservoir and a discharge port; a shuttle valve having an inlet port connected to the pump discharge port and an outlet port connected in fluid communication with said power cylinder for alternately pressurizing and relieving the power cylinder, said shuttle valve having a return circulation port in communication with said reservoir for conveying power fluid out of the power cylinder as it is relieved; an electric motor disposed for heat exchange with power fluid circulated through said reservoir and mechanically coupled to said hydraulic power pump for driving said power pump in response to electrical power conducted downhole from a surface facility; a length of flexible, composite production tubing extendable into the well and which can be wound and unwound from a reel, said composite production tubing including a tension load bearing component for supporting said pump in the well, a production conduit component coupled to said production cylinder for conveying formation fluid produced by said pump, an electrical power transfer component coupled to said motor for supplying operating power from an external power source to said motor, and a hydraulic supply conduit and a hydraulic return conduit coupled to the power fluid reservoir for conveying hydraulic power fluid to and from a surface facility; and, a surface facility including a pump and a heat exchanger connected in series fluid circuit relation with said supply and return conduits for circulating hydraulic power fluid through said power fluid reservoir and for transferring heat from said electric motor, respectively.