Hassan Hassanzadeh

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CO 2 storage in deep saline aquifers is considered a possible option for mitigation of greenhouse gas emissions from anthropogenic sources. Understanding of the underlying mechanisms, such as convective mixing, that affect the long-term fate of the injected CO 2 in deep saline aquifers, is of prime importance. We present scaling analysis of the convective(More)
Carbon dioxide injected into saline aquifers dissolves in the resident brines increasing their density, which might lead to convective mixing. Understanding the factors that drive convection in aquifers is important for assessing geological CO 2 storage sites. A hydrodynamic stability analysis is performed for non-linear, transient concentration fields in a(More)
1. Introduction The sequestration of anthropogenic CO 2 into geological formations has been considered as a potential method to mitigate climate change. Accurate evaluation of the capacity of a saline aquifer for CO 2 sequestration, and the fate of the injected fluids in sedimentary basins needs precise representation of brine and CO 2 PVT data (Adams and(More)
Carbon dioxide injection into deep saline aquifers is an important option for managing CO 2 emissions. Injected CO 2 dissolves into formation brines from above, increasing brine density and creating an unstable hydrodynamic state favorable for natural convection. Long-term buoyancy-driven flow of high-density CO 2-saturated brine leads to faster trapping(More)
Scale-dependency of dispersivity has been reported from field tracer tests. We present a simple methodology for characterization of dispersivity as a linear function of scale around an injection well using divergent flow tracer test data conducted in fractured formations. Results show that the slope of this linear dispersivity function can be estimated(More)
Traditional dual porosity models do not take into account the effect of matrix block size distribution on the mass transfer between matrix and fracture. In this study, we introduce the matrix block size distributions into an advective-diffusive solute transport model of a divergent radial system to evaluate the mass transfer shape factor, which is(More)
OBJECTIVES To study the treatment of ureteric stones by HO:YAG laser lithotripsy and pneumatic lithotripsy and to evaluate the results of the two treatment modalities to assess effectiveness and complications. MATERIALS AND METHODS Over 1-year period, a total of 79 patients with 82 ureteral stones were randomized into two groups. In group 1 (39 cases with(More)