Experimental Investigation of Immiscible Supercritical Carbon Dioxide Foam Rheology for Improved Oil

• 作 者: Shehzad Ahmed Khaled Abdalla Elraies Jalal Foroozesh Siti Rohaida Bt Mohd Shafian Muhammad Rehan Hashmet Ivy Chai Ching Hsia Abdullah Almansour
• 机 构: Petroleum Engineering Department, Universiti Teknologi PETRONAS,PETRONAS Research Sdn Bhd,Department
• 出 处: Journal of Earth Science
• 发表日期: 2017年05期
• 关键词: viscosity rheometer rheology unstable surfactant supercritical behaviour reservo

This paper presents the rheological behaviour of supercritical CO_2(s CO_2) foam at reservoir conditions of 1 500 psi and 80 °C. Different commercial surfactants were screened and utilized in order to generate a fairly stable CO_2 foam. Mixed surfactant system was also introduced to generate strong foam. Foam rheology was studied for some specific foam qualities using a high pressure high temperature(HPHT) foam loop rheometer. A typical shear thinning behaviour of the foam was observed and a significant increase in the foam viscosity was noticed with the increase of foam quality until 85%. A desired high apparent viscosity with coarse texture was found at 85% foam quality. Foam visualization above 85% showed an unstable foam due to extremely thin lamella which collapsed and totally disappeared in the loop rheometer. Below 5_2%, a non-homogenous and unstable foam was found having low viscosity with some liquid accumulation at the bottom of the circulation loop. This research has demonstrated rheology of s CO_2 foams at different qualities at HPHT to obtain optimal foam quality region for immiscible CO_2 foam co-injection process.

This paper presents the rheological behavior of supercritical CO_2 (s CO_2) foam at reservoir conditions of 1 500 psi and 80 ° C. Different commercial surfactants were screened and utilized in order to generate fairly stable CO_2 foam. Mixed surfactant system was also introduced to generate strong foam. Foam rheology was studied for some specific foam qualities using a high pressure high temperature (HPHT) foam loop rheometer. A typical shear thinning behavior of the foam was observed and a significant increase in the foam viscosity was noticed with the increase of Foam visualization above 85% showed an unstable foam due to extremely thin lamella which collapsed and totally disappeared in the loop rheometer. Below 5_2%, a non-homogenous and unstable foam was found having low viscosity with some liquid accumulation at the bottom of the circulation loop. This research has demons trated rheology of s CO_2 foams at different qualities at HPHT to obtain optimal foam quality region for immiscible CO_2 foam co-injection process.