Pneumatic-on-top counterbalanced three-chamber cylinder for artificial lift operations
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United States of America Patent
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Apr 25, 2017
Grant Date -
Jan 14, 2016
app pub date -
Jul 8, 2014
filing date -
Jul 8, 2014
priority date (Note) -
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Abstract
An artificial lift system for use with a subterranean well can include a cylinder having a piston reciprocably disposed therein, the piston having opposing sides, each of the opposing sides being selectively communicable with a hydraulic pressure source and a hydraulic reservoir, and the piston having another side in communication with a gas pressure source, and the gas pressure source including a gas compressor connected between gas containers. A method of controlling an artificial lift system can include connecting a cylinder to a hydraulic pressure source and to a gas pressure source, operating a gas compressor of the gas pressure source, thereby increasing gas pressure applied to the cylinder from the gas pressure source, and displacing a piston, thereby operating a downhole pump.
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