Halliburton Energy Services, Inc.

Mathew J McEachern

Yanmei Li

Tao Tao

Huajun Chen

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, one side being selectively communicable with a hydraulic pressure source and a hydraulic reservoir, and the other side being selectively communicable with the hydraulic pressure source and at least one accumulator, and the accumulator being selectively communicable with an input side of a pump of the hydraulic pressure source. A method of controlling an artificial lift system can include connecting a cylinder to a hydraulic pressure source including a hydraulic pump, the pump being connected between the cylinder and at least one accumulator, the accumulator being connected to a gas pressure source, and operating a gas compressor of the gas pressure source, thereby increasing hydraulic pressure applied to the pump from the accumulator.

Accumulator over hydraulic pump double-acting cylinder for artificial lift operations

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, one side being selectively communicable with at least one accumulator, and the other side having two areas, each of the areas being selectively communicable with a hydraulic pressure source and a hydraulic reservoir, and a gas pressure source connected to the accumulator, the gas pressure source including a gas compressor connected between at least one gas container and the accumulator. A method of controlling an artificial lift system can include connecting a cylinder to a hydraulic pressure source and to at least one accumulator, the accumulator being connected to a gas pressure source, and operating a gas compressor of the gas pressure source, thereby increasing hydraulic pressure applied to the cylinder from the accumulator.

Accumulator counterbalanced three chamber cylinder for artificial lift operations

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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Houston, TX, United States of America

Mathew J McEachern