06179056 is referenced by 23 patents and cites 20 patents.

An artificial lift, concentric tubing production system for a well and method of using same. The system including an upper concentric tubing string portion comprising an inner production tubing string positioned within an outer production tubing string. A flow crossover assembly is connected to the upper concentric tubing string portion. The flow crossover assembly has first and second passageways. The inner production tubing string is in fluid communication with the first passageway and the outer production tubing string in fluid communication with the second passageway. An upper transducer is in fluid communication with one of the passageways of the flow crossover assembly and a lower apparatus is in fluid communication with the other of the passageways of the flow crossover assembly. The upper transducer may be a pump such as an electric submersible pump or a progressive cavity pump. The lower apparatus may be a pump, including an electric submersible pump, or a liquid/gas separator.

Title
Artificial lift, concentric tubing production system for wells and method of using same
Application Number
9/241721
Publication Number
6179056 (B2)
Application Date
February 2, 1999
Publication Date
January 30, 2001
Inventor
David Randolph Smith
Wassenaar
US
Agent
Akin Gump Strauss Hauer & Feld
US
Assignee
YPF International
US
IPC
E21B 43/14
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