Application of Conventional and Constant-Rate Mercury Injection on Microscopic Pore Structure Research

Abstract

Microscopic pore structure features for cores in different formations are studied by conventional mercury method and constant-rate mercury method. With constant-rate mercury injection data, distribution curve feature of pore parameters are related with permeability, which including body radius, throat radius and aspect ratio distribution curve; the statistics parameters (skewness, standard deviation and kurtosis) for above three pore features are also analyzed and related to macroscopic parameters, including permeability and porosity. With conventional mercury injection data, major factors affecting reservoir producing in microscopic pore are screened with statistics methods, normalization Pc-curves are made by J function method including withdrawal curves, and compared on different permeability and formations; relationship between microscopic pore structures features and reservoir producing is analyzed, which need further research. Key words : Conventional mercury injection; Constant-rate mercury injection; Producing state; Statistics method