Calculation method for ICD completion coupling model and target profile of horizontal wells in heterogeneous bottom water reservoir

The Inflow Control Device (ICD) has been increasingly used in staged completion of horizontal wells in recent years. However, the semi-analytical coupling model built for ICD completion cannot accurately reflect the end effect in horizontal wells, and there is a lack of basis for the selection of target inflow profile during ICD optimization design. Therefore, a reservoir seepage model was first introduced based on potential superposition principle and specular reflection principle to accurately reflect the inflow features of horizontal wells, and a steady state coupling model was built which was suitable for ICD completion of heterogeneous bottom water reservoirs. Thereafter, in view of different production systems of oil wells, this paper provides the determination method for optimized target inflow profile of horizontal wells in heterogeneous reservoirs completed with ICD, describes in detail the design procedure of ICD taking nozzle-type ICD as an example and compares and analyzes the calculation results of optimal non-uniform ICD and optimal uniform ICD. The result shows that the optimized design of ICD is closely related to production system and uniform inflow profile is not always the ideal inflow profile. The flow control effect of non-uniform ICD is superior to that of uniform ICD, but well completion with uniform OCD is more widely adaptable to the bottom hole flow pressure. The high production pressure difference helps bring to play the flow control advantage of nozzle-type ICD.