Effects of cleaning process using toluene and acetone on water-wet-quartz/CO2 and oil-wet-quartz/CO2 wettability

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外文摘要：Acetone,toluene,and heptane have been perceived as the conventional cleaning agents for the preservation of original water-wet rock reservoir wettability,and for restoration of oil-wet core to its initial wetting condition,prior to measurement of contact angles of CO2-brine-rock systems.However,these organic solvents could be adsorbed on rock surfaces,which modifies the wettability of the reservoir rock and thus triggers uncertainties of the CO2 containment estimation.Presently,there is scarcity of data in literature on the impact of cleaning agents on the wettability of rock/CO2/brine/systems and its attendant effect on CO2 storage capacities.To provide insights on the impact of cleaning agents on CO2 wettability of sandstone,water-wet and oil-wet quartz substrates were aged in acetone,toluene,and heptane,respectively.Advancing and receding contact angles of CO2-brine-quartz systems were measured at a constant temperature(323 K)and varying pressures(5-20 MPa).Impact of cleaning the minerals surfaces with air plasma,N2 and oven after cleaning with either toluene or acetone on CO2 wettability was also assessed and compared.The results show that chemicals that are used quite often to clean mineral surfaces can alter the rock wettability.Significant alterations in wetting conditions were observed when oil wet-rock was cleaned with toluene and water-wet rock was cleaned with acetone.Our results suggest that to preserve the original wettability,we will need to use toluene to clean the water-wet rock and acetone to clean the oil-wet rock.Heptane is only suitable for wettability modification of the oil-wet cores and not for restoration of oil-wet core to its original reservoir wettability.The results confirm that air plasma is the only way to remove surface contamination and organic carbon from the quartz substrates.Cleaning minerals surfaces or rock samples by toluene,acetone and heptane without air plasma will lead to incorrect contact angle and bias wettability measuments.

外文关键词：

CO2 storageWettabilityCleaningAcetoneToluene

作者：

Ahmed Al-Yaseri、Ghazanfer Raza Abbasi、Nurudeen Yekeen

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作者单位：

Petroleum Engineering Department,School of Engineering,Australian College of Kuwait,Kuwait

Petroleum Engineering Discipline,School of Engineering,Edith Cowan University,270 Joondalup Dr,Joondalup,6027,WA,Australia

Department of Chemical & Petroleum Engineering Faculty of Engineering Technology and Built Environment,UCSl University,No.l,Jalan Menara Gading UCSI Heights(Toman Connaught),Cheras,56000,Kuala Lumpur,Malaysia

出版年：

2022

DOI：

10.1016/j.petrol.2021.109555

Journal of Petroleum Science & Engineering

ISSN：0920-4105

年,卷(期)：2022.208PC

被引量22
参考文献量80