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2013 (Vol. 5, Issue: 18)
Article Information:

Research on the Calculation Method of System Efficiency Considering Influence of Free-Gas

Zhang Xishun, Wu Xiaodong, Han Guoqing, An Yongsheng and Wu Di
Corresponding Author:  Zhang Xishun 

Key words:  Energy method, free-gas expansion energy, gas expansion power, input power, rod pumping system, system efficiency,
Vol. 5 , (18): 4552-4555
Submitted Accepted Published
October 17, 2012 December 19, 2012 May 05, 2013
Abstract:

At present only the influence of free-gas to the pump efficiency was considered in the simulation of system efficiency of rod-pumped well, the energy of it released was overlooked, resulting in the simulation precision of system efficiency in high-GOR wells was low. Aiming at this phenomenon, a new theory was raised that the gas of the layer released energy in the lifting process including two parts: dissolved-gas expansion energy and free-gas expansion energy. The motorís input power of rod pumping system was divided into hydraulic horse power, gas expansion power, surface mechanical loss power, down-hole viscous friction loss power and down-hole sliding friction loss power. Using the theory of energy-conserving, the simulation model of free-gas expansion power was established, the simulating models of the motorís input power which were based on the energy method were improved and the simulation precision of system efficiency was enhanced. The simulation examples indicated that the free-gas expansion power canít be overlooked when calculating the input power and the new simulation models of system efficiency had higher simulation precision.
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  Cite this Reference:
Zhang Xishun, Wu Xiaodong, Han Guoqing, An Yongsheng and Wu Di, 2013. Research on the Calculation Method of System Efficiency Considering Influence of Free-Gas.  Research Journal of Applied Sciences, Engineering and Technology, 5(18): 4552-4555.
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ISSN (Online):  2040-7467
ISSN (Print):   2040-7459
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