METHOD OF DETERMINATION OF RELATIVE PHASE PERMEABILITIES Russian patent published in 1997 - IPC

FIELD: examination of precesses of liquid multiphase filtration. SUBSTANCE: stationary examinations with taking the standard curves of relative phase permeabilities are preformed preliminarily with standard specimens of porous media having similar physical and chemical properties. Obtained curves are represented by analytical expressions of type y₁=Φ₁(x₁,p₁,...p_n), y₂=Φ₂(x₂,q₁,...q_n), (I), where ; S is saturation of porous medium by displacing agent; S_C is saturation by displacing agent in bound state; S_T is limiting (maximum obtainable) saturation by displacing agent; f₁(s) and f₂(s) are relative phase permeabilities of displacing agent and displaced liquid; F₁ and F₂ are relative phase permeabilities of displacing agent and displaced liquid at S_T and S_C, respectively; P₁,P₂,..., P_n and q₁,q₂..., q_m are parameters determined by method of the smallest squares. In determination of dependences (1) use is made of parameters S_C, S_T, F₁, F₂, characteristic of standard specimens. Values S_C, S_T, F₁, F₂, characterizing the properties of porous media specimens studied in process of nonstationary examinations are determined by condition of minimum root- mean-square deviation of theoretically calculated dependences from time of volume of liquid displaced from porous medium and pressure difference from values obtained experimentally. Then relative phase permeabilities of examined specimens are calculated by expressions of type (1) with the use of values of parameters S_C, S_T, F₁, F₂, found by data of nonstationary examinations. EFFECT: higher results of analysis. 3 tbl