Investigation into SITO Split-Range Control System as Alternative Techniques over Ratio Control Strategy on Hydrocyclone

Abstract

The production of Crude Oil from the reservoir and the subsequent processing of the reservoir fluid come with litany of environmental impact issues. This work focuses on the control of the differential pressure ratio of the Hydrocyclone using an alternative scheme. The control of the Hydrocyclone Differential Pressure Ratio is a major determinant of the efficiency of separation. Traditionally, among the various PID Control Strategies, the Ratio Control Method is of choice in the Differential Pressure Ratio control of the Hydrocyclone. Thesis work looks at an alternative control strategy using the Single input-Two Output (SITO) Split-Range control novel strategy proposed by Fatani et al in Saudi Aramco to model an algorithm for a Differential Pressure Ratio Controller on a Hydrocyclone. The proposed model deployed Proportional-Integral Control architecture and the controlled Proportional signal is routed to the Smaller valve on the outlet of the Oil Reject Line of the Hydrocyclone while the Integral controlled Signal is to the Bigger Valve on the outlet of the treated Water line. The model was simulated using the MATLAB SIMULINK Software to demonstrate the implementation using the design consideration of Ratio 2 as an indication of highest separation efficiency.  Input variable of Feed Pressure ranges of 80psi to 165psi were used to illustrate response of the model and the corresponding simultaneous actuation of the two valves in tune with the Controller signals. The model algorithm and variable results of Differential Pressures at the two outlet during simulation clearly indicates that the Differential Pressure Ratio on the Hydrocyclone can alternatively be implemented using the SITO Split-Range Control System.

Key words: Investigation, SITO, Split-Range, Control system, Alternative Techniques, Hydrocyclone