Work

Impact of CO2-Brine-Shale Interaction on Wettability Change at Reservoir Temperature and Pressure via AFM Characterization

Year: 2024

Type: article

Abstract: High Resolution Image Download MS PowerPoint Slide Shale experiences alterations in mineral composition and surface properties after carbon dioxide treatment, significantly influencing the efficacy of the CO 2 -enhanced oil recovery and sequestration. This study delves into the impact of CO 2 on shale surface characteristics by treating shale samples with CO 2 in both distilled water and 10 wt % CaCl 2 brine solution. The ion chromatography system was utilized to track ion concentration changes before and after the reaction, pinpointing the specific interactions between CO 2 and shale. Atomic force microscopy further assessed changes in shale’s micromorphology and mineral distribution. This study also reveals how CO 2 affects the shale surface wettability. Our results show that in distilled water, the reaction mainly involves mineral corrosion and calcite dissolution, which increase shale’s porosity and render its surface less hydrophilic. This phenomenon is more significant at lower temperatures and higher pressures. Conversely, in a 10 wt % CaCl 2 brine solution, calcite precipitation changes the shale’s surface composition, making it more hydrophilic, especially under low-temperature and high-pressure conditions. These insights provide a fundamental understanding and valuable guidelines to enhance carbon utilization and sequestration.

Source: Energy & Fuels

DOI: 10.1021/acs.energyfuels.4c04136

Authors: Jiacheng Dai, Aikifa Raza, Tianyu Wang, Shouceng Tian, Gensheng Li, TieJun Zhang

Institutions: Khalifa University of Science and Technology, China University of Petroleum, Beijing

Language: English

Topic: CO2 Sequestration and Geologic Interactions

Subfield: Environmental Engineering

Field: Environmental Science

Domain: Physical Sciences

SDG: Climate action

Open Access status: hybrid

Estimated APC paid: $4,500