Effect of Nanoparticles on Flow Alteration and Saturation during CO2 Injection and Post Flush
- Xing Zhang (China University of Petroleum) | Fa-guo Tian (Sulige Gas Field Research Center of PetroChina Changqing Oilfield Company) | Hong Zhou (Faculty of Earth Resources, China University of Geosciences) | Hong-ling Du (PetroChina Xinjiang Oilfield Company) | Chao Ding (PetroChina Xinjiang Oilfield Company) | Jing Wang (China University of Petroleum) | David A. DiCarlo (The University of Texas at Austin)
- Document ID
- Society of Petroleum Engineers
- SPE Annual Technical Conference and Exhibition, 9-11 October, San Antonio, Texas, USA
- Publication Date
- Document Type
- Conference Paper
- 2017. Society of Petroleum Engineers
- 1.6 Drilling Operations, 1.6.9 Coring, Fishing, 5.4 Improved and Enhanced Recovery, 5.4 Improved and Enhanced Recovery
- Saturation, CO2 Injection, Post Flush, Flow Alteration, Nanoparticle
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We observed that the mechanism appears to be spontaneous generation of nanoparticle-stabilized droplets of the injected phase, which increases the effective viscosity of that phase. In this paper, we combine water alternating gas and nanoparticles to look into whether the presence of nanoparticles results in more CO2 being trapped, after an additional flood with brine.
This paper concludes two experiments to study the transport behavior of nanoparticles. In the first experiment, CO2 was used to displace 2 wt% NaBr solution in a cylindrical core (diameter 7 cm, length 30 cm) of Boise sandstone (porosity 27.5%, permeability 1D), and then post flush with NaBr solution. For the second experiment, CO2 was used to displace the 2 wt% NaBr and 5 wt% nanoparticles solution in the core, and then post flush with nanoparticles solution. Dynamics of the displacement front and pressure drop across the core were measured in real time with CT scanner and pressure transducers respectively.
Different front dynamics are seen of wetting and nonwetting phases and the stabilizing front is generated by Roof snap-off events. When CO2 displaces brine in which surface treated silica nanoparticles, the initial and residual CO2 saturation are higher than that of the brine without nanoparticles. And the C constant of Land-curve is 2.2 and 2.4 respectively in the nanoparticle case and control case. The results suggest that pre-positioning a dispersion of nanoparticles in the brine will be potential for mobility control in CO2 storage and CO2 EOR, and can eventually be used in engineering CO2 injection protocols.
Introducing engineered nanoparticles into an aquifer or reservoir can potentially control the fluid mobility in CO2 storage and CO2 EOR. This provides an interesting alternative approach for mobility control in CO2 EOR which would work well with WAG processes. Moreover, the same process can increase enhance the residual trapping of CO2 and therefore increase the number of competent formations for secure CO2 storage.
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