Core draining while defining its relative phase permeability with a method of joint steady-state filtration

For the first time it was discovered that while defining relative phase permeability with the method of a joint steady-state filtration there takes place a core draining within the process of a steady-state filtration. It causes errors in definition of relative phase permeability.
Materials and methods
OST 39-235-89 “Oil. The method of phase permeability determination in the laboratory conditions at the joint steady-state filtration”.
Results
Consideration of the found out peculiarities of relative phase permeability allows improving accuracy of the measurement.
Сonclusions
A method of a joint steady-state filtration does not guarantee measurements ofphase permeability only at a core saturation changes nature corresponding to the reservoirs engineering. That is why the nature of saturation change at steady-statemeasurements shall be controlled with the help of special filtration modes. Another methodto avoid errors related to changes of core saturation is application of a non-steady-state or a pseudo-steady-state filtration method of phase permeability.