화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.97, 506-514, May, 2021
DOI10.1016/j.jiec.2021.03.007  Export Citation
Study of nano-SiO2 reinforced CO2 foam for anti-gas channeling with a high temperature and high salinity reservoir
Wanli Kang1, 2, †, Haizhuang Jiang1, 2, Hongbin Yang1, 2, Zhe Li1, 2, Bobo Zhou1, 2, Yingqi He1, 2, Bauyrzhan Sarsenbekuly1, 2, and Maratbek Gabdullin1, 2
  • 1Ministry of Education, Key Laboratory of Unconventional Oil & Gas Development China University of Petroleum (East China), Qingdao 266580, PR China
  • 2School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, PR China
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CO2 flooding has been widely applied in lots of low permeability reservoirs. After extensive CO2 injection, some reservoirs began to show serious gas channeling problems. CO2 foam had been successfully used to solve gas channeling problems due to its advantages of water selective plugging features (not plugging oil). In this paper, a novel CO2 foam system was developed for high temperature and high salinity(HTHS) (85 ℃, 60,000 mg/L) aiming at solving the gas channeling in Changqing Oilfield. Taking the foam half-life as the evaluation standard, the optimum foam system (0.5 wt% EC-1 + 1 wt% SiO2) for the target reservoir was determined. The influences of temperature, salinity and pressure on the CO2 foam performance were studied by high temperature and high pressure(HTHP)method. The ability and mechanism of anti-gas channeling were studied by experiments of sand packed tube and microscopic displacement, respectively. The results showed that the foam system possessed good foam properties at HTHS with pressure. As the concentration of SiO2 nanoparticles increased, the resistance factor of the foam system increased. However, temperature showed an adverse effect on foam stability, the resistance factor decreased with the increase of temperature. The Jamin superposition and emulsion plugging mechanism of foam system was revealed by microscopic displacement experiments.
Keywords:SiO2 nanoparticles;CO2 foam;Anti-gas channeling;High temperature and high salinity
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