An Efficient Fully Implicit Simulator

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Abstract
This paper describes PORES, an efficient general purpose implicit three-phase three-dimensional black oil reservoir simulator. Efficiency is achieved by solving the coupled equations using a new sequential method which automatically ensures material balance. A new iterative method for the solution of the linear equations is described. This method also conserves material and uses a truncated conjugate gradient technique to accelerate convergence. Simultaneous and direct solution options are also provided. PORES contains an extensive well model which is numerically stable, meets production targets precisely, and apportions flows accurately to individual layers of the reservoir model. Other practical features include a numerical aquifer model, flexible pseudo function facilities, and a two-point upstream option for the control of numerical dispersion. Two examples are presented to illustrate the use of the fully-implicit sequential method.

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