Study on the Effect of Cations on the Surface Energy of Nano-SiO Particles for Oil/Gas Exploration and Development Based on the Density Functional Theory

Overview

Journal Molecules

Publisher MDPI

Specialty Biology

Date 2024 Feb 24

PMID 38398666

Authors

Jun Ni

Lei Zhang

Chengjun Wang

Weibo Wang

Ge Jin

Affiliations

Soon will be listed here.

Abstract

Although nano SiO exhibits excellent application potential in the field of oil and gas exploration and development, such as drilling fluid, enhanced oil/gas recovery, etc., it is prone to agglomeration and loses its effectiveness due to the action of cations in saline environments of oil and gas reservoirs. Therefore, it is crucial to study the mechanism of the change in energy between nano SiO and cations for its industrial application. In this paper, the effect of cations (Na, K, Ca, and Mg) on the surface energy of nano SiO particles is investigated from the perspective of molecular motion and electronic change by density functional theory. The results are as follows: Due to the electrostatic interactions, cations can migrate towards the surface of nano SiO particles. During the migration process, monovalent cations are almost unaffected by water molecules, and they can be directly adsorbed on the surface by nano SiO particles. However, when divalent cations migrate from a distance to the surface of nano SiO particles, they can combine with water molecules to create an energy barrier, which can prevent them from moving forward. When divalent cations break through the energy barrier, the electronic kinetic energy between them and nano SiO particles changes more strongly, and the electrons carried by them are more likely to break through the edge of the atomic nucleus and undergo charge exchange with nano SiO particles. The change in interaction energy is more intense, which can further disrupt the configuration stability of nano SiO. The interaction energy between cations and nano SiO particles mainly comes from electrostatic energy, followed by Van der Waals energy. From the degree of influence of four cations on nano SiO particles, the order from small to large is as follows: K < Na < Mg < Ca. The research results can provide a theoretical understanding of the interaction between nano SiO particles and cations during the application of nano SiO in the field of oil and gas exploration and development.

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