Patent ID: 6354377
Filing Date: 2002-03-12
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 first chamber arranged in parallel spaced relationship to said second chamber, said first chamber having a volume approximately equal to a volume of said second chamber, said first chamber having a top end aligned in a horizontal plane with a top of said second chamber, said first chamber having a bottom end aligned in a horizontal plane with a bottom of said second 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, said vent being in valved communication with said liquid string at a location above said first and second chambers, said vent adapted to pass a vented gas from said first and second chambers and into said liquid string; a compressor connected to said power gas string and adapted to pass a pressurized gas into said power gas string; and a valve connected to said power gas string and to said first and second chambers, said valve adapted to selectively allow the pressurized gas to enter said first chamber and said second chamber so as to cause a liquid in said first chamber to pass through said outlet of said first chamber and into said liquid string and to cause a liquid in said second chamber to pass through said outlet of said second chamber and into said liquid string.