Macroscopic numerical reservoir simulation based on microscopic percolation mechanism

Key words:  microscopic percolation mechanism  percolation theory  network model  remaining oil distribution  high water-cut development period  macroscopic numerical reservoir simulation

Abstract:

The remaining oil distribution during high water-cut development period was controlled by the fluid properties and pore configuration of rock. The microscopic features of pore throat were not taken into account in the classical numerical reservoir simulation. The network model was established to describe the microscopic features of pore throat, and the hypothesis of basic line unit was improved, which could describe fluid distribution features and water flooding mechanism more precisely. The relative permeability curves based on microscopic percolation mechanism were calculated by percolation theory, and which were used in classical reservoir simulation. The combination of microscopic percolation mechanism and macroscopic numerical reservoir simulation became a reality. The macroscopic simulation results of the remaining oil distributing form and rules based on microscopic percolation mechanism agree well with real fluid distribution. The results can provide technical parameters for profile controlling, water plugging and chemical flooding.