Well rig lift system and a hydraulic energy-storing well rig lift system
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United States of America Patent
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Feb 21, 1995
Grant Date -
N/A
app pub date -
Dec 14, 1992
filing date -
Dec 10, 1992
priority date (Note) -
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Abstract
A well rig lifting system and a hydraulic energy-storing well rig lifting system, wherein a high pressure energy-storing cylinder and a composite cylinder or cylinder group are used to carry out the lifting and lowering operations. During the lifting operation, a power machine under a substantially constant load continuously pumps oil to the energy-storing cylinder, and communication relationships of the energy-storing cylinder with various chambers of the composite cylinder or cylinder group is selected to provide an appropriate lifting force to lift the pipe string. Therefore, the installed capacity of the power machine can be reduced to 1/3-1/4 of that in a conventional lifting system. During the lowering operation, communication relationships of the energy-storing cylinder with various chambers of the composite cylinder or cylinder group is selected to provide an appropriate lifting force grade less than the gravity of the pipe string, so as to utilize the energy-storing cylinder to recover the potential energy released during the lowering of the pipe string. The recovered energy can then be used to carry out auxiliary operations during the lowering operation, and therefore no power machine is needed to run. The recovered energy can also be used in power generation, heating, etc.
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