Research Progress on Calculation Methods and Influencing Factors of Tight Reservoir Irreducible Water Film Thickness

doi:10.3969/j.issn.1006-6535.2023.04.001

Abstract

Abstract: To address the problem that there are many kinds of calculation methods for the thickness of irreducible water film in tight reservoirs, and the method cannot be accurately selected in the actual research, the calculation methods and influencing factors of irreducible water film thickness in tight reservoirs are summarized in recent years. The study shows that the calculation methods for irreducible water film thickness in tight reservoirs are divided into macroscopic calculation methods based on the ratio of irreducible water film volume to pore throat surface area and microscopic derivation methods that simplify the matrix into capillary model or from the perspective of microelements; the irreducible water film is divided into initial water film, post-displacement water film and post-imbibition water film, and the thickness of the initial water film is influenced by the relative humidity, reservoir depth and permeability of the reservoir, and the thickness of the post-displacement water film is influenced by the displacement pressure, permeability and porosity, and the post-imbibition water film thickness is influenced by the water saturation, ion mass concentration and matrix composition. This study has implications for the selection of calculation methods for the irreducible water film thickness in tight reservoirs and the study of recovery enhancement.

Key words: irreducible water film thickness, tight reservoir, influencing factors, imbibition, displacement

CLC Number:

TE348

Liu Zhinan, Zhang Guicai, Wang Zenglin, Ge Jijiang, Du Yong. Research Progress on Calculation Methods and Influencing Factors of Tight Reservoir Irreducible Water Film Thickness[J]. Special Oil & Gas Reservoirs, 2023, 30(4): 1-9.

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