A Novel 3D Field-Scale Reservoir Numerical Simulator for Predicting the FinesMigration and Production Performance

摘要

Sand fines release and migration is a universal problem in theproduction of oil from unconsolidated sandstone reservoirswhich can result in both sanding problems and profoundeffects on oil recovery. A new three dimensional (3D) fieldscale mathematical model, differing from those used forconventional oil reservoir numerical simulator in that both theadvanced theories of sand particle release and migration, ispresented. And the model is solved by a finite-differencemethod and the line successive over relaxation (LSOR)technique. A numerical simulator is written in Fortran 90 andVC++ and it can be used to predict (1) the sand content inproduced liquid, (2) the porosity and permeability changescaused by sand release and migration in formation, and (3)well production performances and residual oil distribution. Aseries of runs of oil field examples with five-spot patternswere made on the numerical simulator. The results show thatsanding problems in the oil formation can accelerate theheterogeneity of the reservoir rocks, and has an obviousinfluence on production performances: water-drive process,water-cut trends, and oil recovery. In a conclusion, the newsimulator improves the ability and accuracy for numericalsimulating the development of the unconsolidated sandstonereservoirs.