Abstract
The inflow control device/automatic inflow control device (ICD/AICD) water control completion technology can effectively improve the equilibrium of the liquid production profile of horizontal wells and delay the water ridge problem caused by the heel-toe effect and reservoir heterogeneity. The optimal model of water control completion is the theoretical basis for ICD/AICD completion to equilibrate fluid production. Although many optimal models of water control completion have been proposed, most do not fully consider the reservoir and completion characteristics. In this study, a theoretical model for the optimal design of water control completion is established based on the source function and network model, considering the well trajectory, heterogeneity, drilling pollution, and annulus flow. The variation in fluid production in each producing segment of the heterogeneous reservoir was analyzed for different segments and different flow limiting intensities. The results show that water control completion mainly improves liquid production in the middle permeability zone of the overall horizontal well permeability. For reservoirs with strong heterogeneity, increasing the fluid production in the low permeability zone by excessively restricting the production in the high-permeability zone will cause the fluid production in the middle permeability zone to increase sharply and form water ridges. Segmentation can improve the equilibrium of the fluid production profile, but when the permeability difference is large, too many segments will require a large amount of work and segmentation will have little effect on the equilibrium of the fluid production profile. In engineering applications, the optimized design of water control completion should have the goal of increasing fluid production in the middle permeability zone. The research results are helpful in improving the accuracy of the water control completion model and guide field applications.
NSTL