When using topside choking to eliminate severe slugging in offshore pipeline-riser systems,the resulting stability and effectiveness depend critically on the choice of variables in the associated control model.In this...When using topside choking to eliminate severe slugging in offshore pipeline-riser systems,the resulting stability and effectiveness depend critically on the choice of variables in the associated control model.In this study,both potential process variables and manipulated variables are investigated via manual choking experiments.Monotonicity and linearity are adopted as principles for selecting the optimal variables,and the availability of signals in an offshore field is also considered.Both amplitude-domain and time-domain variables are studied,of which five are recommended as the process variable,while the resistance factor of the choking valve is the optimal manipulated variable;other variables may act as auxiliary variables in the control model.How to determine the set value of the process variable is also discussed.Validation experiments with automatic control show that the optimized variables enable faster stabilization.This study offers a reference for the design of slugging control for offshore fields.展开更多
基金the financial support received from the China National Key Research and Development Project(Grant No.2022YFC2806202)the Fundamental Research Funds for the Central Universities(Grant No.xtr042024002).
文摘When using topside choking to eliminate severe slugging in offshore pipeline-riser systems,the resulting stability and effectiveness depend critically on the choice of variables in the associated control model.In this study,both potential process variables and manipulated variables are investigated via manual choking experiments.Monotonicity and linearity are adopted as principles for selecting the optimal variables,and the availability of signals in an offshore field is also considered.Both amplitude-domain and time-domain variables are studied,of which five are recommended as the process variable,while the resistance factor of the choking valve is the optimal manipulated variable;other variables may act as auxiliary variables in the control model.How to determine the set value of the process variable is also discussed.Validation experiments with automatic control show that the optimized variables enable faster stabilization.This study offers a reference for the design of slugging control for offshore fields.
