Abstract
Tuning of the equation of state have proven to be the most successful method for improving the performance of compositional reservoir simulators. The data used for this purpose are normally PVT laboratory measured values of overall fluid composition, densities and viscosities, together with saturation pressure and liquid dropout at the cell conditions. In the simulation of oil recovery processes, where changes in compositions and interphase mass transfer are dominant factors, the tuning should logically be based on matching with measured values of compositions rather than, or in addition to, the aforesaid values. This is even more essential in solvent injection simulations, where the overall composition of the fluid is continuously changing. Existing tuning techniques provide a degree of improvement, however, change of composition in solvent injection requires regression and tuning on the base of composition matches in a multiple contact process. In this work we have developed a computer programme for simulation of multiple contact gas injection process which has been used for reproducing some experimental values on composition in constant composition expansion and multiple gas injection tests. The Peng-Robinson equation of state is examined for matching the measured values.
