Research on oil-water treatment control of three-phase separator based on dynamic mathematical model and GA algorithm
With the increasing water content of produced liquid in current oilfield,in order to improve the dewatering efficiency of horizontal three-phase separators,and to address the problem that the increase of inlet flow rate and outlet flow rate will cause in-terference to the separator control system,this study established a mathematical model for the relationship between the dewatering effi-ciency of separators and the height of oil-water interface,and introduced genetic algorithm to obtain the optimal height of oil-water interface.In this study,based on the oil-water interface control process of the three-phase separator,the separator is improved to build a dynamic mathematical model to reduce the interference of the control system.The experimental results show that when the oil-water interface height is 2.062 m,the dehydration efficiency of the separator is the highest,which is 95.47％.The average dehy-dration efficiency of the separator after optimization is 7.08％higher than that before optimization.When the inlet and outlet flow of the separator increases,the internal pressure of the separator changes within 500 to 1 000 Pa,which is within the normal range that the separator can bear.The liquid level control model established in this research is consistent with the output response of the separa-tor control system in actual operation.The research results have certain value in the research field of horizontal three-phase separator control system,and can be used as a technical reference.
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