BOAST: a three-dimensional, three-phase black oil applied simulation tool (version 1. 1). Volume I. Technical description and Fortran code

Abstract

This report provides technical information about a newly developed three-dimensional, three-phase black oil simulator. The documentation includes the code for the black oil applied simulation tool (BOAST), and is presented such that it can be readily used by the public. The simulator is an upgraded version of the simulator developed by Sawyer and Mercer (1978). Volume I contains a discussion of the methods used in deriving the flow equations, converting them to finite difference form, solving the subsequent linear algebraic systems, and evaluating the results. Volume II is a program user's manual. BOAST is designed to be an easy-to-use program which would be suited to simulation of primary depletion, pressure maintenance by water and/or gas injection, and basic secondary recovery operations (such as waterflooding) in a black-oil reservoir. BOAST contains only an IMPES formulation with direct elimination (BAND and D4) and LSOR solution options. It can be used to evaluate many of the common field production situations and it should be competitive with, if not faster than, commercially available simulators.