New 2D Front-Tracking Approach for Modeling the Performance of Water-Drive GasReservoirs. Final Report, March 1993-December 1994

摘要

Two of the primary difficulties in predicting the performance of waterdrive gasreservoirs are: (1) predicting the strength and extent of the supporting aquifer, and (2) predicting sweep patterns of encroached water. This report presents the development of a new two-dimensional (2D) front-tracking approach that can accurately model water influx into gas reservoirs, but which allows more extensive multiple runs than can generally be afforded with conventional simulators. This approach treats an advancing water front as a sharp discontinuity, with primary computational effort on determination of the location of the front. By treating fluid properties in each region of the reservoir (univaded gas, water swept, and original aquifer) as uniform, this approach concentrates computational effort on the hydrodynamics of fluid movement with a corresponding increase in computational speed.