Pore-Scale Modelling of Three-Phase Capillary Pressure Curves Directly in Uniformly Wet Rock Images | Zendy

Yingfang Zhou | Zendy; D. G. Hatzignatiou | Zendy; Johan Olav Helland | Zendy; Yulong Zhao | Zendy; Jianchao Cai | Zendy

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Pore-Scale Modelling of Three-Phase Capillary Pressure Curves Directly in Uniformly Wet Rock Images

Author(s) -

Yingfang Zhou,

D. G. Hatzignatiou,

Johan Olav Helland,

Yulong Zhao,

Jianchao Cai

Publication year - 2021

Publication title -

geofluids

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.44

H-Index - 56

eISSN - 1468-8123

pISSN - 1468-8115

DOI - 10.1155/2021/6622079

Subject(s) - capillary pressure , capillary action , saturation (graph theory) , mechanics , characterisation of pore space in soil , phase (matter) , petroleum reservoir , capillary number , geology , three phase , water saturation , two phase flow , relative permeability , materials science , geotechnical engineering , chemistry , porous medium , petroleum engineering , flow (mathematics) , composite material , porosity , mathematics , physics , voltage , organic chemistry , combinatorics , quantum mechanics

In this work, we developed a semianalytical model to compute three-phase capillary pressure curves and associated fluid configurations for gas invasion in uniformly wet rock images. The fluid configurations and favorable capillary entry pressures are determined based on free energy minimization by combining all physically allowed three-phase arc menisci. The model was first validated against analytical solutions developed in a star-shaped pore space and subsequently employed on an SEM image of Bentheim sandstone. The simulated fluid configurations show similar oil-layer behavior as previously imaged three-phase fluid configurations. The simulated saturation path indicates that the oil-water capillary pressure can be described as a function of the water saturation only. The gas-oil capillary pressure can be represented as a function of gas saturation in the majority part of the three-phase region, while the three-phase displacements slightly reduce the accuracy of such representation. At small oil saturations, the gas-oil capillary pressure depends strongly on two-phase saturations.

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