A New Formulation for Generalised Compositional Simulation

An important recent trend in reservoir simulation has been the development of multiple application simulators which can model both black oil and compositional processes within a single program. A number of different mathematical formulations have been proposed for solving the fluid flow equations in these simulators. With an IMPES solution scheme there are two basic approaches; Newton-Raphson methods, such as that of Young and Stephenson (1983), and the volume balance method of Watts (1986). Various fully implicit schemes have also been described. Although these methods all solve the same underlying equations, the relationship between them is not easily understood.