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This paper presents a comprehensive analysis of the well performance during clean-up when the well is equipped with either autonomous, passive, or active sandface flow control completion (sFCC). Numerical modelling is used to study this performance. A few studies have investigated the clean-up performance of sFCCs, especially of the autonomous sFCCs. The sFCC clean-up performance is modelled using an integrated, numerical simulation of dynamic flow processes in a coupled wellbore-reservoir model. The well model is first saturated with the drilling and completion fluids by considering the effect of the mud cake formation and lift-off pressure during well flow back, as well as the relative permeability hysteresis of the invaded zone. The sFCC's performance is modelled and verified using published input data. The simulations reveal how the various sFCC types differ in their clean-up performance, including: The sFCC equipped with Inflow control devices (ICDs) can accelerate the clean-up process compared with conventional (i.e. no sandface flow control) completion. The clean-up efficiency of this sFCC type rests on balancing the positive effect of the more uniform inflow profile along the completion and the negative effect of imposing a higher pressure drop across the completion. The sFCC equipped with Interval control valves (ICVs) allows sequential clean-up of the well zones, where the clean-up of each zone can be optimised separately. Finally, the clean-up performance of the sFCC with autonomous flow control devices (AFCDs) is more complex being highly sensitive to this sFCC's design, the extend of the invaded zone, the wellbore trajectory and etc. Finally, a generic discussion on how to possibly improve the sFCC clean-up is presented. This work improves our understanding of the clean-up performance of wells with sFCCs. |
