Prediction of CO₂/water/quartz wettability behavior during CO₂ storage in deep saline aquifers

ABSTRACT

In the context of geological CO₂ sequestration projects, CO₂/water/rock wettability directly affects the capacities of residual and structural trapping mechanisms. Therefore, presenting an accurate model that can simulate the wettability behavior of CO₂/water/rock under different environmental conditions is necessary. In this study, a new model based on adaptive neuro-fuzzy interference system (ANFIS) was developed for estimation of CO₂/water/quartz contact angle as a function of influencing parameters, such as pressure, temperature, salinity, and salt type. Results of the proposed model were compared to the actual data and it was found that the presented model has immense potential with high correlation coefficient (R²) of 0.991 and average absolute relative error (AARE) of 2.010 for predicting the CO₂/water/quartz contact angle. Finally, a sensitivity analysis was performed on the influencing factors. Results of this analysis demonstrated that salinity and pressure have the highest impact on the wettability of CO₂/water/quartz.

KEYWORDS:

• CO₂ sequestration
• contact angle
• CO₂/water/quartz system
• modeling
• ANFIS

Additional information

Notes on contributors

Amin Daryasafar

Amin Daryasafar received his academic degrees from Petroleum University of Technology (PUT) and has work experience as petroleum reservoir engineer at National Iranian South Oil Company (NISOC). He has worked on different research areas of petroleum engineering including numerical modeling and simulation of conventional and unconventional reservoirs, using nanoparticles for scale formation inhibition, modeling heat transfer in fractured reservoirs, modeling reservoir fluids properties, and enhanced oil recovery (EOR) techniques such as microbial enhanced oil recovery (MEOR), surfactants, polymers, nanofluids flooding, etc.

Khalil Shahbazi

Khalil Shahbazi is an Associate Professor of Petroleum Engineering at the Petroleum University of Technology. He received his PhD in Petroleum Engineering from University of Calgary. His research interests including Conventional and Underbalanced Drilling, Drilling Fluids and Rheology of Non-Newtonian Fluids, Hydraulic Fracturing Modeling, Applications of Finite Difference in Wellbore and Near-Wellbore Flow, Multi-Phase Flow in Wellbores and Fractures.