This paper presents a new numerical approach which models interwell tracer flow paths in transient two-phase flow in heterogeneous porous media. The approach adopted is sequential in that the velocity and pressure fields are solved simultaneously using a mixed finite element approach, the phase saturation is solved by mass balance, and then the tracer is transported and its concentration at the production well is predicted using a random walk model. Mass conservation has been achieved throughout all the numerical procedures.

Comparative studies between conventional finite difference methods and the methods presented in this paper show a significant reduction of numerical dispersion by the new method. Effects of physical dispersion, adsorption, two-phase flow and transient state on tracer flow behaviour are presented. Tracer test cases for a quarter five-spot pattern with homogeneous permeability and with assumed heterogeneities are analysed. A multi-well, irregularly shaped reservoir case has also been presented.

Keywords:
spe 28901, concentration profile, interwell tracer flow behaviour, equation, dispersion, tracer fluid flow, flow in porous media, fluid dynamics, daltaban, tracer
Subjects:
Reservoir Fluid Dynamics, Improved and Enhanced Recovery, Reservoir Simulation, Formation Evaluation & Management, Flow in porous media, Tracer test analysis
Copyright 1994, Society of Petroleum Engineers
You can access this article if you purchase or spend a download.