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- Title
两性离子表面活性剂和纳米颗粒为起泡剂的高稳定 性超临界二氧化碳泡沫封窜体系.
- Authors
李伟涛; 李宗阳; 张 东; 张传宝; 李友全
- Abstract
Low permeability reservoirs in Shengli oilfield are characterized with deep burial depth(>3000 m), high temperature (>120 ℃), and strong heterogeneity. Aiming at the problems of low sweep efficiency of CO2 flooding and poor profile control performance of conventional foam, a highly stable supercritical CO2 foam system with zwitterionic surfactant(HSD)and modified SiO2 nanoparticles as foaming agents was developed. The foaming performance and temperature resistance of the system at high temperature were studied. The effects of nano-SiO2 on the rheological properties, plugging properties and profile control performance of supercritical CO2 foam system were evaluated respectively. Finally, the stabilization mechanism of nanoparticle reinforced supercritical CO2 foam was discussed. The results showed that the highly stable supercritical CO2 foam system had good foaming performance and temperature resistance. With increasing dosage of nanoparticle in the system, the half-life of foam gradually increased first and then decreased. At 110 ℃, 0.5% nanoparticle could increase the half-life of foam drainage from 17 min to 40 min, and then the stability was improved by nearly 2.5 times. At the same shearing rate, the apparent viscosity of the system increased with the increase of nanoparticle concentration, and then the consistency coefficient increased from 0.073 to 1.220. In the core flooding experiment, the steady-state apparent viscosity of foam in porous media increased with the increase of nanoparticle concentration, thereby increasing the plugging strength. Supercritical CO2 foam was stacked and discharged in“granular”shape. The foam size was 10—20 μm. Supercritical CO2 foam had good profile control and displacement performance, which could block high permeability channels and compel subsequent injected CO2 into low permeability matrix, thus improving oil recovery. Surfactant molecules adsorbed on the surface of nano-SiO2, which made it have interfacial activity, and then nano-SiO2 adsorbed on the gas-liquid interface to improve the stability of foam.
- Publication
Oilfield Chemistry, 2024, Vol 41, Issue 1, p101
- ISSN
1000-4092
- Publication type
Article
- DOI
10.19346/j.cnki.1000-4092.2024.01.014