10.5.14 Slim Tube Test

A slim tube test is used to study the miscibility condition of a reservoir oil sample when it comes in contact with a gas sample flowing inside a long tube filled with sand (porous media) in a near one-dimensional flow condition. In general, a number of slim tube tests are performed at constant temperature with varying pressures to determine the minimum pressure at which miscibility is achieved after injection of certain pore volume of gas. The minimum miscibility pressure (MMP) together with production information during slim tube tests may be used to optimize an equation-of-state model for use in reservoir simulations. Slim tube tests may also be used to optimize injection gas composition that ensures miscibility at condition of particular oil reservoir.