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• W2108660180 abstract "Gas production from low permeability unconventional reservoirs is still a challenge to the world. Although hydraulic fracturing has been successfully applied in unconventional gas production, its limitations are obvious, such as formation damage, water blocking, low stimulating effect and the requirement of sufficient water. To avoid these problems, liquid CO2 has been pumped as a fracturing fluid into unconventional reservoirs. But as a consequence of low density and viscosity of super critical phase CO2 in the formation, CO2 fracturing suffers from low sweep efficiency that manifests as viscous fingering. So various additives have been applied to improve CO2 fracturing effect. This paper introduces a novel additive, nanoparticles, and presents an experiment to evaluate its effect on CO2 fracturing. In this paper, a core flooding experiments was conducted to simulate the fracturing process, in which liquid CO2 was injected into a core to drainage brine or nanoparticles solution. During the process, CO2 distribution and pressure drop were real-time measured with a modified medical CT scanner and pressure transducers. A significant difference is observed between with and without nanoparticles. The saturation files show that CO2 fingering was decreased and the drainage area was improved with the action of nanoparticles. Meanwhile, the CO2 injecting pressure raised, which implies that nanoparticles could offer higher pore pressure in fracturing. These observations suggest that a nanoparticle-stabilized foam is formed between CO2 and nanoparticle solution, which suppress the viscous instability. The results provide nanoparticles are effective to enhance CO2 fracturing. Also, this experiment suggests an optimized protocol of CO2 fracturing with nanoparticles in unconventional reservoir stimulate." @default.
• W2108660180 created "2016-06-24" @default.
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• W2108660180 date "2015-09-01" @default.
• W2108660180 modified "2023-09-27" @default.
• W2108660180 title "An experimental study on application of nanoparticles in unconventional gas reservoir CO 2 fracturing" @default.
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• W2108660180 doi "https://doi.org/10.1016/j.petrol.2015.05.023" @default.
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