Oil well production system

Details Oil well production system Oil well production system

E - Fixed Constructions

21

B

E21B 33/035 (2006.01) E21B 23/03 (2006.01) E21B 36/00 (2006.01) E21B 43/12 (2006.01) E21B 43/40 (2006.01)

Patent

CA 2073415

-21- ICR 8289 & 90/004 Abstract Of The Disclosure A production system for a subsea well includes a concentric gas lift string and a production tubing string both located within a production riser. Lift gas injected down the annulus between the production tubing string and gas tubing string is injected into the production tubing string below the mud line and thus provides gas lift assistance to the produced fluid stream. Thus increased produced fluid flow is provided while simultaneously insulating the produced fluid from the surrounding ocean thus maintaining the temperature of the produced fluid which aids separator efficiencies once the produced fluid reaches a surface platform associated therewith. The use of the concentric gas tubing string avoids pressurizing of the production riser. A gas lift mandrel and associated apparatus are provided at the subsurface tubing hanger to permit gas to be selectively directed down to a lower gas lift valve located deeper within the well.

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