Oil-Gas-Water Relative Permeability Tester
The oil-gas-water relative permeability tester is used to determine the relative permeability of gas-water and oil-water through the unsteady-state method. The unsteady-state method is based on one-dimensional two-phase flow theory and is divided into constant rate method and constant pressure method: (1) Oil-water relative permeability determination: using the constant rate method, record the oil production, liquid production, and pressure difference at the outlet end of the core during water flooding, calculate the oil-water relative permeability and water saturation using the "J.B.N" method, and plot the curves. (2) Gas-oil (water) relative permeability determination: using the constant pressure method, record the gas production, oil (water) production, and pressure difference during gas flooding of oil (water), similarly calculate the gas, oil (water) relative permeability and water saturation using the "J.B.N" method, and plot the curves.
Compared to the steady-state method, the unsteady-state method takes less time but involves more complex mathematical processing and requires the following conditions to be met: a. Apply a sufficiently large pressure gradient to reduce capillary pressure and end effects; b. Homogeneous core; c. Fluid properties remain unchanged during the experiment.
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