Indexed by:会议论文

Date of Publication:2017-01-01

Included Journals:CPCI-S

Page Number:1295-1302

Key Words:reservoir; wettability; supercritical CO2; contact angles; berea sandstones

Abstract:CO2 emission reduction can be achieved effectively by burying captured CO2 in deep saline aquifer with lots of basin structure layers. To estimate storage capacity of saline aquifer and achieve safe and long-term capillary trapping of CO2, wettability of caprocks related to reservoir temperature and pressure should be measured thoroughly. Therefore, in this study the contact angles of different Berea sandstones in the presence of supercritical, liquid and gas CO2 were measured through Sitting-Drop method and the wettability alteration of Berea sandstone surfaces in the presence of supercritical CO2 was systematically investigated at elevated temperatures and pressures. According to the research, contact angles of different Berea sandstones exhibited different response to the temperature and pressure change, which may be caused by difference in physical property, in terms of absolute permeability, surface roughness and component. In this work, around the CO2 phase change region, wettability alternation of solid surface is discovered, which implicates that CO2 storage capacity of saline acquire might be overestimated when caprock is less water wet, vice versa.