Abstract

A new parallel thermal simulator is developed in order to conduct large scale multiphase and multicomponent reservoir simulation and overcome mass balance problems happening in the conventional domain decomposition method. The reservoir model is built by mass conservation law, energy conservation law, constraints on phase saturation and component concentration and phase equilibrium equations. The formula for the accumulation term, flux term and sink/source term are given. And Newton-Raphson iteration numerical method is used. The work flows of the serial simulator and parallel simulator are designed respectively.

A steam flooding case with 100×80×5 grid blocks is carried out on linux parallel cluster. The reservoir contains 16 vertical wells and products 960 days. Simulation results show that the performance of parallel simulator can largely improve the speedup and efficiency with the increase of processors.