Effect of Wetting Hysteresis on Flow Resistance for Two-phase Fluid System in Shale Reservoirs

doi:10.11885/j.issn.1674-5086.2021.03.15.05

Abstract

Abstract: The mechanism of the wetting hysteresis effect on threshold pressure and flow resistance was revealed, and the threshold pressure model and the flow resistance model after the movement of the bubble/droplet were established for a twophase fluid system based on the static wetting hysteresis equation and the dynamic contact angle equation, respectively. Based on the experimental data in the literature, the threshold pressure at different temperature and pressure, and the flow resistance at different pore size, viscosity and surface tension were calculated, by using the established models. The results show that the threshold pressure and the flow resistance caused by static wetting hysteresis and dynamic contact angle hysteresis cannot be ignored in nano-scale pores of shale. The flow resistance caused by dynamic wetting hysteresis is greater than the threshold pressure caused by static wetting hysteresis, and with the increase of flow velocity, the flow resistance continues to increase, but the degree of the growth rate gradually decreases. This study provides a mathematical model for the accurate characterization of the threshold pressure and flow resistance of two-phase fluid in shale reservoirs, which will provide some theoretical basis for accurate numerical simulation of shale gas development and geological storage of CO₂ in shale reservoirs.

Key words: wetting hysteresis, threshold pressure, flow resistance, dynamic contact angle, shale reservoir

CLC Number:

TE312

GAO Yanling, WU Keliu, CHEN Zhangxing, TIAN Weibing, LI Jing. Effect of Wetting Hysteresis on Flow Resistance for Two-phase Fluid System in Shale Reservoirs[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2021, 43(5): 66-72.

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