Numerical analysis of gas-liquid flow through porous medium in application with gas reservoir.

摘要

The objective of this thesis is to analyze two-phase flow and predict gas production from gas reservoirs. A FORTRAN code based on mass and momentum balances from each phase has been developed to fulfill this goal.;This program code simulates isothermal, two-phase, three dimensional, Darcy flow in gas reservoirs. A finite difference, implicit pressure explicit saturation (IMPES), line successive overrelaxation (LSOR) numerical techniques were incorporated in this program code.;The main contribution of this work is a new gas reservoir simulator capable of describing gas and water production, and two phases flow behavior in naturally as well as hydraulically fractured reservoirs.;The predicted gas and water production using our model agreed well with production data from SFE ;The study of gas reservoirs with different fracture densities and locations showed that the increase in overall permeability of the formation due to fractures does not necessarily play a significant role in enhancement of production, while the location and distribution of fractures have a considerable effect.;Finally, the study of gas reservoirs with different aquifer locations and sizes showed that the location of aquifer has a significant effect on water as well as gas production. Furthermore, a case with an aquifer connected to the production zone through a fracture showed that the fracture siphone the water from aquifer directly to production zone and enhances the water production.