Abstract
Aiming at the drawbacks of the optimization and design methods and the practical production goal of least energy consumption, a new theory is 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 motor’s input power of rod pumping system is divided into hydraulic horse power, gas expansion power, surface mechanical loss power, subsurface loss power. Using the theory of energy-conservation, the simulation model of free-gas expansion power has been established, the simulating models of the motor’s input power which are based on the energy method have been improved and the simulation precision of system efficiency has been enhanced. The entire optimization design models have been set up in which the single-well output is taken as the optimum design variable, the planed production of all oil wells in an overall oilfield as the restraint condition and the least input power of the overall oilfield as the object. Synthesizing the optimization design results of the single well and the entire oilfield, the optimal output and the optimal swabbing parameters of all wells can be got. The actual optimizing examples show that the total power consumption designed by the entire optimization method is less 12.95% than that by the single optimization method.
Highlights
The sucker rod pumping system is the most popular artificial lift system all over the word (Brown, 1982)
Gibbs (1982) and Xu(2000) proposed the method which was based on a given output constraints or not consider production for restraint and chose the maximum system efficiency as the objective function; the method introduced by Zhen and Deng (2007) was based on a given output as constraint and chose the least energy consumption as the objective function
The objective functions above were consistent, because the maximum system efficiency could be achieved when the energy consumption is least for the constant production
Summary
The sucker rod pumping system is the most popular artificial lift system all over the word (Brown, 1982). The above results indicated that most optimization and design of swabbing parameters of pumping wells centered on the single well. These previous models all considered that the free-gas had been blown out from the casing or the freegas only influences the pump efficiency and ignored the energy of free-gas releasing itself. Aiming at the practical production situation and the drawbacks of the optimization and design methods, an improved calculation method of system efficiency of rod pumping wells considering influence of free-gas was set up basing on the energy consumption method. Technol., 5(8): 2630-2635, 2013 and the simulation and optimization method of swabbing parameters of rod pumping wells was proposed in this study, with the least energy consumption as the objective function. Taking all the wells into account, all the swabbing parameters of pumping wells and the corresponding fluid production rates and flowing pressures at the premise of the completion of planed oil production were optimized
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