Repository logo
 

Probing the interactions of dolomite surfaces with oil at the molecular scale

Accepted version
Peer-reviewed

No Thumbnail Available

Type

Article

Change log

Authors

Wang, N 
Collins, IR 
Webb, KJ 
Wan, Q 

Abstract

The oil wettability of reservoir rock surfaces is a key issue affecting oil production and enhanced oil recovery. Understanding of the factors that determine this wettability and how to change the rock wetting state is necessary in order to improve oil recovery efficiency. In this study, Atomic Force Microscopy (AFM) has been used to study the change of wettability of dolomites after exposure to crude oil. Oil aggregates are seen to adhere to particular areas of the surface in a manner dependent on the surface electrical potential, with a higher affinity towards regions of the surface with negative charge indicating that asphaltenes possess a native positive charge. The effect of exposure to brine has also been studied, the key finding being that via a modification of the surface potential, it leads to significantly less adsorption of the polar components of oil.

Description

Keywords

40 Engineering, 4019 Resources Engineering and Extractive Metallurgy

Journal Title

Energy and Fuels

Conference Name

Journal ISSN

0887-0624
1520-5029

Volume Title

33

Publisher

American Chemical Society (ACS)

Rights

All rights reserved