E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 15/00 (2006.01) E21B 19/08 (2006.01) E21B 44/06 (2006.01)
Patent
CA 2085044
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.
Dongchang Sun
Guihua Luan
Ruji Bing
Wei Pan
Xinyi Gu
Drilling Technology Research Institute Of Shengli Oilfield
G. Ronald Bell & Associates
LandOfFree
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