Petroleum Reservoir Evaluation and Development >
2025 , Vol. 15 >Issue 4: 613 - 624
DOI: https://doi.org/10.13809/j.cnki.cn32-1825/te.2025.04.010
Applicability of LARSEN & SKAUGE relative permeability hysteresis model in high-temperature and high-pressure CO2-water alternating injection experiments
Received date: 2024-09-06
Online published: 2025-07-19
The relative permeability hysteresis effect in porous media has been studied extensively over many years, leading to relatively consistent conclusions. Due to the influence of this hysteresis effect, parameters such as the shapes of relative permeability curves across different cycles and the saturation levels of each trapped phase are affected by the saturation path and saturation history during gas-water alternating injection processes. In petroleum engineering applications involving multi-phase flow under alternating conditions, the relative permeability hysteresis phenomenon cannot be neglected. Current numerical simulation studies on CO₂-water alternating processes often fail to adequately consider the relative permeability hysteresis effect, leading to discrepancies between simulated and actual results for key parameters such as CO2 storage capacity and oil recovery rates. Therefore, based on the Larsen & Skauge three-phase relative permeability hysteresis model, multi-cycle CO₂-water alternating injection experiments were designed and conducted under high-temperature and high-pressure conditions using oil-bearing cores. The variations in relative permeability curves during gas-water alternating injection with different initial injection phases under both miscible and immiscible conditions were systematically analyzed. The Larsen & Skauge three-phase relative permeability hysteresis model was used to fit the core experimental data numerically, and the fitting results using experimentally measured hysteresis parameters were compared with those obtained after parameter calibration. The results showed that hysteresis phenomena were more pronounced in immiscible experiments compared to miscible ones. Additionally, the core’s initial saturation state influenced the gas-water alternating displacement effect. The experimentally determined hysteresis parameters were only valid as initial fitting values, and separate experimental fittings are required for different operating conditions. These findings provide a reference for evaluating the relative permeability hysteresis effect in CO₂-water alternating processes, reveal the variation patterns of relative permeability curves during multi-cycle gas-water alternating displacement, and improve the accuracy of numerical simulation studies on hysteresis effects related to oil recovery and CO₂ storage.
WANG Shuoshi , JI Qiang , GUO Ping , LIU Huang , WEN Lianhui , XU Ruifeng , WANG Zhouhua , ZHANG Ruixu . Applicability of LARSEN & SKAUGE relative permeability hysteresis model in high-temperature and high-pressure CO2-water alternating injection experiments[J]. Petroleum Reservoir Evaluation and Development, 2025 , 15(4) : 613 -624 . DOI: 10.13809/j.cnki.cn32-1825/te.2025.04.010
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