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research-article

Experimental Investigation of Amine-Surfactant CO2 Foam Stability Enhanced by Silica Nanoparticles

[+] Author and Article Information
Liang Zhang

School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, 266580, China
zhlupc@upc.edu.cn

Jun Kang

School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, 266580, China
s17020338@s.upc.edu.cn

Yin Zhang

Petroleum Engineering, College of Engineering and Mines, University of Alaska Fairbanks, Fairbanks, USA
yzhang35@alaska.edu

Panfeng Zhang

School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, 266580, China
b17020083@s.upc.edu.cn

Shaoran Ren

School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, 266580, China
rensr@upc.edu.cn

Santanu Khataniar

Petroleum Engineering, College of Engineering and Mines, University of Alaska Fairbanks, Fairbanks, USA
skhataniar@alaska.edu

Xinyang Guo

School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, 266580, China
guoxy@upc.edu.cn

1Corresponding author.

ASME doi:10.1115/1.4040205 History: Received December 06, 2017; Revised May 03, 2018

Abstract

The CO2 foam generated by using the conventional surfactants usually does not show long-term stability due to the substantial solubility and diffusivity of CO2 in water. SiO2 nanoparticles with different wettability and high adsorption energy on the gas-water interface can be used as a stabilizer to enhance the stability of the CO2 foam. In this study, 9 kinds of nonionic amine surfactants were employed to generate the CO2 foam, while 3 kinds of silica nanoparticles were selected and added to improve the CO2 foam stability. The influences of various factors, including pressure, temperature, pH, surfactant, and nanoparticle, on the CO2 foam stability have been investigated. It has been found that, without nanoparticles, the stability of generated CO2 foam decreases with the increase of the number of EO groups in the ethoxylated amine surfactant, especially under high-temperature and high-pressure conditions. In general, the nanoparticles at low concentration (<0.5wt%) have little influence on the CO2 foam stability. However, adding nanoparticles to a higher concentration (1.0 wt%) can improve the CO2 foam stability significantly. In particular, by adding 1.0 wt% nanoparticle of QS-150 to 0.5wt% surfactant of C18N(EO)2/10, the CO2 foam stability has been increased 5-6 times, while the volume of generated CO2 foam has been increased by 17-31%. Therefore, in this study, the synergetic mechanisms between the amine surfactants and silica nanoparticles to generate and stabilize CO2 foam have been identified.

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