Computational Geosciences
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Finite element evaluation of diffusion and dispersion tensors in periodic porous media with advection
Computational Geosciences - Tập 11 - Trang 43-58 - 2007
This paper presents three-dimensional finite element simulations to evaluate diffusion and dispersion tensors in periodic porous media in the presence of an advective velocity field. These tensors are evaluated in the framework of the double-scale expansion technique. Two problems, a Newtonian flow and a vector-valued advection–diffusion equation, have to be sequentially solved at the pore scale. ......
On simulating reactive chemical transport with dominating precipitated species controlling chemical equilibrium
Computational Geosciences - Tập 2 - Trang 151-170 - 1998
We present an approach developed to compute chemical equilibrium and its corresponding reactive chemical transport when dominating precipitated species (DPS) exist. In computing chemical equilibrium, most models take the concentrations or activities of component species and precipitated species as the master variables. However, when the amount of a precipitated species is much larger than those of......
History matching of multi-facies channelized reservoirs using ES-MDA with common basis DCT
Computational Geosciences - Tập 21 - Trang 1343-1364 - 2016
History matching a channelized reservoir with multiple facies has always posed a great challenge to researchers. In this paper, we present a workflow combining the ensemble smoother with multiple data assimilation (ES-MDA) method with a parameterization algorithm referred to as the common basis discrete cosine transform (DCT) and a post-processing technique in order to integrate static and dynamic......
Ensemble-based multi-scale history-matching using second-generation wavelet transform
Computational Geosciences - Tập 19 - Trang 999-1025 - 2015
Ensemble-based optimization methods are of- ten efficiently applied to history-matching problems. Although satisfactory matches can be obtained, the updated realizations, affected by spurious correlations, generally fail to preserve prior information when using a small ensemble, even when localization is applied. In this work, we propose a multi-scale approach based on grid-adaptive second-generat......
Multi-fidelity meta-modeling for reservoir engineering - application to history matching
Computational Geosciences - - 2016
Sketching the temperature history of geological samples: analyses of diffusion profiles using multilayer perceptrons
Computational Geosciences - Tập 21 - Trang 519-531 - 2017
A method using multilayer perceptrons for analysing diffusion profiles and sketching the temperature history of geological samples is explored. Users of this method can intuitively test and compare results thinking in terms of analytical solutions of the diffusion equation whilst the bulk of the work is made computationally. Being neither completely analytical nor numerical, the method is a hybrid......
Mathematical properties of the foam flow in porous media
Computational Geosciences - Tập 25 - Trang 515-527 - 2021
Foam is used in enhanced oil recovery to improve the sweep efficiency by controlling the gas mobility. A common way to describe the foam displacement is by using population balance models, which consider the foam texture as part of the gas phase. Numerical simulation of such equations presents serious difficulties connected to the high non-linearity in the fractional flow. The linear kinetic model......
Efficient reordered nonlinear Gauss–Seidel solvers with higher order for black-oil models
Computational Geosciences - Tập 24 - Trang 593-607 - 2019
The fully implicit method is the most commonly used approach to solve black-oil problems in reservoir simulation. The method requires repeated linearization of large nonlinear systems and produces ill-conditioned linear systems. We present a strategy to reduce computational time that relies on two key ideas: (i) a sequential formulation that decouples flow and transport into separate subproblems, ......
A new method for the construction and optimization of quadrangular adaptive well pattern
Computational Geosciences - Tập 21 - Trang 499-518 - 2017
A proper well pattern will have considerable effects on the oil field production, with the ultimate recovery of hydrocarbon enhanced and the water production rate reduced. Comparing with triangular well pattern, quadrangular well pattern has more advantages in some cases and has broader application prospects. However, constructing an optimal quadrangular well pattern is more complicated and has no......
Tổng số: 959
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