Dynamic Autonomous Inflow Control Device - Performance prediction and experimental investigation of a specific rate controlled production valve design
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Horizontal wells in oil fields with a thin oil layer are known to experience early gas and water breakthrough. Rate controlled production (RCP) valves have been installed by Statoil at the Troll field in order to maintain the drawdown and thereby the production rate after breakthrough of gas or water. It is known a-priori that the RCP valve has a selective choking effect for low viscosity fluids. Little research have been published on how the valve chokes the flow and what parameters affect the choking. This thesis aims to verify the working principle behind the RCP valve. In order to do this a model based on analytical equations have been proposed and tested using a flow-loop experiment. The tests were done using air, water and hydraulic oil. The tests verified that the analytical based model was able to predict the pressure loss and flow across the valve. It was also attempted to verify if the plate inside the RCP valve was stable or if the valve experiences oscillations during choking. The tests indicate that there are oscillations during choking and that the choking effect is dependent on the surface roughness and uniformity of the plates.