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논문 기본 정보

자료유형
학술저널
저자정보
Nikhil Bagalkot (Indian Institute of Technology-Madras) Govindarajan Suresh Kumar (Indian Institute of Technology-Madras)
저널정보
한국지질과학협의회 Geosciences Journal Geosciences Journal Vol.21 No.1
발행연도
2017.1
수록면
55 - 69 (15page)

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초록· 키워드

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A variable aperture model, including the random variation of fracture aperture as against the conventional parallel plate model, has been developed to adequately examine the transport of colloids/suspended particles in a single coupled fracturematrix system. Rather than relying on a complex geostatistical method for an accurate representation of fracture aperture, which requires an enormous field data and resource for its validation, a simple statistical method (linear congruential generator) is implemented in the present article. The random variation of fracture aperture is an honest representation of the unpredictable geometry/ morphology of fracture aperture in comparison with widely applied the conventional parallel plate model or the simple mathematical functions based on fractal theory (self-affine structures). A considerable number of parameters are involved in investigating the extent of penetration of colloids into the rock matrix, which creates complexity and ambiguity in the analysis. To overcome this problem, a single parameter “Maximum Penetration Factor” has been introduced for simple and reliable assessment of diffusion of colloids within the rock matrix. Additionally, a non-dimensional parameter ‘Matrix Mitigation Factor’ has been introduced in the present study, which can provide a means of evaluating the diffusion of suspended particles within the rock matrix when it comes to real time applications like microbial enhanced recovery (MEOR) and chemical enhanced recovery (CEOR) in the petroleum industry (nanoparticles and nanofluids). A semi-implicit finite difference model has been adopted for solving the coupled partial differential equations in the present numerical study. Finally, Neumann and Robinson boundary conditions as a function of time have been applied at the fracture inlet to better represent the field scenario as against the conventional constant source condition (Dirichlet). The model results indicate that there is a difference in concentration between the parallel plate model and random fracture model when it comes to colloidal concentration in the fracture and rock matrix. The variance in concentration is due to the inclusion of variation of the aperture in the variable aperture model, which is absent in the parallel plate model. Additionally, the results suggest that the variable source boundary condition has a significant influence on the transport of colloids in fracture-matrix system. Finally, from the evaluation of the extent of diffusion of colloids into rock matrix, it was concluded that that variable aperture model is associated with more mitigation of colloids compared to the parallel plate model, especially in the case of random fracture.

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참고문헌 (43)

참고문헌 신청
Abdel-Salam, A. / 1994 / Analytical solutions for one-dimensional colloid transport in saturated fractures / Advances In Water Resources 17:283~296 google schola A. Avogadro / 1983 / The Role of Colloids in Nuclear Waste Disposal / MRS Proceedings 26:495~506 Crossref Baek, I. / 1996 / Colloid-facilitated radionuclide transport in fractured porous rock / Waste Management 16:313~325 google schola Nikhil Bagalkot / 2016 / Numerical modeling of two species radionuclide transport in a single fracturematrix system with variable fracture aperture / Geosciences Journal 20(5):627~638 dbpia Bagalkot, N / 2015 / Thermal front propagation in variable aperture fracture–matrix system: A numerical study. Sadhana / Indian Academy of Sciences 40:605~622 google schola

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