Patent ID: 6237692
Filing Date: 2001-05-29
Classification: E21B,F04F

Abstract:
An artificial lift system for use in a well bore comprising:a first chamber having an inlet and an outlet;a second chamber having an inlet and an outlet, said second chamber being arranged in side-by-side spaced and separate parallel relationship to said first chamber;a power gas string in valved communication with said first chamber and said second chamber;a liquid string in valved communication with said outlet of said first chamber and with said outlet of said second chamber;a vent in valved communication with said first chamber and with said second chamber;a compressor connected to said power gas string and adapted to pass a pressurized gas into said power gas string; anda valve connected to said power gas string and to said first and second chambers, said valve selectively and alternately allowing the pressurized gas to enter said first chamber and said second chamber so as to directly displace a liquid in said first chamber through said outlet of said first chamber and into said liquid string and to directly displace a liquid in said second chamber through said outlet of said second chamber and into said liquid string.