Chapter 7 - Streamline Numerical Well Testing Interpretation Model Considering Components

Abstract

This chapter examines the streamline numerical well testing interpretation method considering components. During the development process of a special reservoir, phase variation and miscible phase often happen among sub-surface fluids, and these fluid variations have great influence on pressure testing. Phase state variation happens when fluid flows underground, and phase state is described through phase equilibrium. The phase equilibrium calculation is based on the principle that gas/liquid fugacity is equivalent in the equilibrium condition. The Newton–Raphson method is used for both the dew point and bubble point calculations, and the calculation formula is the same as the Newton–Raphson method in flash calculation. There are many of streamlines around the well, and the well testing interpretation model is established along each streamline. In this way, three-dimensional well testing problems are simplified to one dimension, which improves the calculation velocity and solution stability. For simplification, pseudo-components are used to represent real fluid components.