Modeling of capacitance flow behavior in EOS compositional simulation

He, Wenhao; Okuno, Ryosuke

doi:10.1016/j.petrol.2015.04.014

Cited by 12 publications

(3 citation statements)

References 73 publications

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“…Hence, the understanding of various petrophysical correlations can be improved by this cost-effective digital approach. Quantifying the impact of different pore-scale processes on hydraulic and mechanical reservoir properties is of particular importance for numerous applications related to geological subsurface utilisation, including geothermal systems [69,70], energy storage [71,72], hydrocarbon reservoirs [73,74], nuclear waste disposal [75,76] or groundwater resources [77,78].…”

Section: Advantages and Opportunities Of Synthetic Sandstonesmentioning

confidence: 99%

Diagenetic Trends of Synthetic Reservoir Sandstone Properties Assessed by Digital Rock Physics

2021

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Quantifying interactions and dependencies among geometric, hydraulic and mechanical properties of reservoir sandstones is of particular importance for the exploration and utilisation of the geological subsurface and can be assessed by synthetic sandstones comprising the microstructural complexity of natural rocks. In the present study, three highly resolved samples of the Fontainebleau, Berea and Bentheim sandstones are generated by means of a process-based approach, which combines the gravity-driven deposition of irregularly shaped grains and their diagenetic cementation by three different schemes. The resulting evolution in porosity, permeability and rock stiffness is examined and compared to the respective micro-computer tomographic (micro-CT) scans. The grain contact-preferential scheme implies a progressive clogging of small throats and consequently produces considerably less connected and stiffer samples than the two other schemes. By contrast, uniform quartz overgrowth continuously alters the pore space and leads to the lowest elastic properties. The proposed stress-dependent cementation scheme combines both approaches of contact-cement and quartz overgrowth, resulting in granulometric, hydraulic and elastic properties equivalent to those of the respective micro-CT scans, where bulk moduli slightly deviate by 0.8%, 4.9% and 2.5% for the Fontainebleau, Berea and Bentheim sandstone, respectively. The synthetic samples can be further altered to examine the impact of mineral dissolution or precipitation as well as fracturing on various petrophysical correlations, which is of particular relevance for numerous aspects of a sustainable subsurface utilisation.

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Section: Advantages and Opportunities Of Synthetic Sandstonesmentioning

confidence: 99%

Diagenetic Trends of Synthetic Reservoir Sandstone Properties Assessed by Digital Rock Physics

2021

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“…Reviews and comparative studies (Christie 1996;Barker and Thibeau 1997;Farmer 2002;Durlofsky and Chen 2012) provide detailed discussions on various methods and outstanding issues. Single-phase-flow upscaling (Durlofsky 1991;Chen et al 2003;Wu et al 2008;Zhang et al 2008) attempts to capture the fine-scale features of the flow by calculating an equivalent permeability (k*) or transmissibility (T*) that predicts the same total single-phase flow through a homogeneous coarse block as the summation of flow through all underlying fine blocks. Single-phase upscaling represents the most commonly applied upscaling technique in practice.…”

Section: Introductionmentioning

confidence: 99%

“…The mass flux between zones can represent the nonequilibrium behavior at the subgrid scale. Evazi and Jessen (2014) and Zhang and Okuno (2015) developed a similar approach to dual-zone mixing. The pore space is arranged into two levels of porosity depending on flow contribution, and a dual-porosity/dual-permeability flow model is adapted for coarse-scale flow simulation.…”

Section: Introductionmentioning

confidence: 99%

K-Values-Based Upscaling of Compositional Simulation

Salehi

Voskov

2019

SPE Journal

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Summary Enhanced-oil-recovery (EOR) processes involve complex flow, transport, and thermodynamic interactions; as a result, compositional simulation is necessary for accurate representation of the physics. Flow simulation of compositional systems with high-resolution reservoir models is computationally intensive because of the large number of unknowns and the strong nonlinear interactions. Thus, there is a great need for upscaling methods of compositional processes. The complex multiscale interactions between the phase behavior and the heterogeneities lie at the core of the difficulty in constructing consistent upscaling procedures. We use a mass-conservative formulation and introduce upscaled phase-molar-mobility functions for coarse-scale modeling of multiphase flow. These upscaled flow functions account for the subgrid effects caused by the absolute permeability and relative permeability variations, as well as the effects of compressibility. Upscaling of the phase behavior is performed as follows. We assume that instantaneous thermodynamic equilibrium is valid on the fine scale, and we derive coarse-scale equations in which the phase behavior may not necessarily be at equilibrium. The upscaled thermodynamic functions, which represent differences in the component fugacities, are used to account for the nonequilibrium effects on the coarse scale. We demonstrate that the upscaled phase-behavior functions transform the equilibrium phase space on the fine scale to a region of similar shape, but with tilted tie-lines on the coarse space. The numerical framework uses K-values that depend on the orientation of the tie-lines in the new nonequilibrium phase space and the sign of upscaled thermodynamic functions. The proposed methodology is applied to challenging gas-injection problems with large numbers of components and highly heterogeneous permeability fields. The K-value-based coarse-scale operator produces results that are in good agreement with the fine-scale solutions for the quantities of interest, including the component overall compositions and saturation distributions.

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Steam-Oil Ratio in Steam-Solvent Coinjection Simulation for Homogeneous and Heterogeneous Bitumen Reservoirs

Venkatramani

Okuno

2018

Journal of Energy Resources Technology

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This research presents a mechanistic analysis of expanding-solvent steam-assisted gravity drainage (ES-SAGD) for heterogeneous reservoirs in terms of cumulative steam-oil ratio (SOR) as a function of cumulative bitumen production. Simulation case studies for SAGD and ES-SAGD with normal hexane at 35 bars are conducted for geostatistical realizations of two types of heterogeneous Athabasca-bitumen reservoirs. For the first type, low-permeability mudstone barriers are oriented horizontally. For the second type, they are inclined and more representative of the middle McMurray member. The solubility of water in the oleic phase at elevated temperatures is properly modeled to ensure reliable comparison between steam-assisted gravity drainage (SAGD) and ES-SAGD. Simulation results show that ES-SAGD is less sensitive to heterogeneity than SAGD in terms of cumulative SOR. On average, the reduction in SOR due to steam-solvent coinjection is simulated to be greater under heterogeneity. The reduction in SOR is greater for reservoir models with inclined mudstone barriers than in those with horizontal mudstone barriers. Analysis of simulation results indicates that the injected solvent tends to accumulate more significantly under heterogeneity, which enhances the mechanisms of ES-SAGD, such as dilution of bitumen by solvent and reduced thermal losses to the overburden. Tortuous hydraulic paths and slower gravity drainage under heterogeneity enhance the mixing between solvent and bitumen in the transverse direction along the edge of a steam chamber. Then, a larger amount of the accumulated solvent tends to facilitate lower temperatures near the chamber edge.

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Modeling of capacitance flow behavior in EOS compositional simulation

Cited by 12 publications

References 73 publications

Diagenetic Trends of Synthetic Reservoir Sandstone Properties Assessed by Digital Rock Physics

Diagenetic Trends of Synthetic Reservoir Sandstone Properties Assessed by Digital Rock Physics

K-Values-Based Upscaling of Compositional Simulation

Steam-Oil Ratio in Steam-Solvent Coinjection Simulation for Homogeneous and Heterogeneous Bitumen Reservoirs

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