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ECMOR V - 5th European Conference on the Mathematics of Oil Recovery
- Conference date: 03 Sep 1996 - 06 Sep 1996
- Location: Leoben, Austria
- ISBN: 3-9500542-0-0
- Published: 03 September 1996
1 - 20 of 48 results
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Iterative Solvers for Dynamically Implicit Reservoir Flow Equations on Irregular Grids
Authors C. Brand and L. J. GanzerModern reservoir simulators allow for local refinement and other types of irregular grids. Moreover the number and type of flow equations will not be the same in all blocks. Depending on the state of the reservoir, some parts may employ a fully implicit discretization, others an IMPES formulation; some parts will use a compositional model and others will just have one-phase flow.
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Parallel Reservoir Simulation with Nested Factorisation
Authors R. Burrows, D. Ponting and L. WoodTo obtain worthwhile gains from massively parallel computers in the area of reservoir simulation we require a high degree of parallelisation and efficient treatment of data input and output. We discuss a domain-based approach in which the reservoir is split into areally defined domains, each treating its own cells and wells. A message passing protocol such as PVM is used as the programming model.
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Parallelization of a General-Purpose Reservoir Simulator
Authors J. E. Killough, J. A. Foster, J. S. Nolen, J. R. Wallis and J. XiaoOver the past few years advances in parallel computing have been significant. Large local memories, fast interprocessor communications, and high speed superscalar nodes have significantly improved the utility of this hardware for reservoir simulation. The following paper discusses a general-purpose reservoir simulator which has been ported to three parallel computers: the Cray T3D, the IBM SP2 and the Silicon Graphics Power Challenge.
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A New Model for History Dependent Saturation Functions in Reservoir Simulation
Authors M. Kriebernegg and Z. E. HeinemannA new model for treating dynamic hysteresis in saturation functions for two and three phase reservoir simulation studies has been developed. It is incorporated in a three dimensional, three phase, fully implicite reservoir simulator.
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Precipitation of Gas Condensates Under the Influence of Capillary Pressure in Porous Media
By K. PotschThis paper describes a method of calculating the influence of the capillary pressure on the phase distribution in a porous medium.
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Mathematical Theory for Two Phase Displacement with Hysteresis (With application to WAG injection)
Authors P. Bedrikovetsky, D. Marchesin and P. BallinTo describe two-phase displacement with hysteresis we use the Buckley-Leverett model with imbibition, drainage and scanning fractional flows. Mathematical theory for the initial-boundary non-self-similar problems is developed. The structure of solutions is presented together with the physical interpretation of phenomena. Analytical solutions for the injection of water slug with the gas drive and for the sequential injection of water and gas slugs with the water drive are obtained. The solutions show that the hysteresis decreases the gas flux in the case where the drainage relative permeability is lower than the imbibition one, which is a positive effect for the wateraltemate- gas injection.
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Diagnosis of Natural Convection of Hydrocarbon Reservoirs
By D. PolonskyOur goal was to study how to diagnose the convection of hydrocarbon mixture before the development of the natural reservoir.
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Two-Phase Segregation in a Thick Reservoir
Authors A. A. Shapiro and E. H. StenbyWe present in this paper the mathematical theory of segregation in a thick oil-gas-condensate reservoir. The theory takes into account the non-equilibrium effect of the geothermal gradient and the action of the capillary forces, due to which a two-phase transition zone between the gas cap and the oillayer is formed. Analytical solutions of the segregation equations are obtained.
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An Analysis of Dynamic Pseudo Relative Permeability Methods
Authors J. W. Barker and P. DupouyThe properties and limitations of 6 widely used dynamic pseudo relative permeability methods are analysed. The example proposed by Stone is used to illustrate our findings. The analytical results are confirmed by numerical simulation.
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Coupled Fluid Flow and Geomechanics in Fractured Reservoir Study
Authors H. -Y. Chen, H. Harstad and L. TeufelThe purpose of this study is to formulate a coupled fluid-flow and geomechanics model of a naturally fractured reservoir.
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Solutions to the Three-Phase Buckley-Leverett Problem
Authors R. E. Guzman and F. J. FayersThis paper presents method of characteristics (MOC) solutions to the three-phase Buckley-Leverett problem with and without gravity, for the three classes of equations described by Guzmán and Fayers (1996).
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A Three Dimensional Grid Construction for the Simulation of Horizontal Wells in Geologically Complex Petroleum Reservoirs
Authors L. C. N. Amado and Z. E. HeinemannFlexible gridding techniques have received great attention in the petroleum literature lately. Voronoi and other non- Cartesian grids using control volume formulations have been investigated and have become common in reservoir engineering studies. Several grid geometries have been presented including orthogonal and non-orthogonal ones.
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Two- and Three-Dimensional Flexible Grids for Reservoir Simulation
More LessThe commonly used Cartesian and hybrid local grid refinements have the disadvantage that the base grid is always Cartesian, which makes it difficult to align along reservoir heterogeneities.
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A Class of Discretization Methods for Structured and Unstructured Grids in Anisotropic, Inhomogeneous Media
Authors I. Avaatsmark, T. Barkve, Ø. Bøe and T. MannsethA class of flux-conservative diseretization schemes are presented for alternative grids in two space dimensions. The family of methods represents a unified approach to diseretization in anisotropic, inhomogeneous media. Both triangular, quadrilateral and polygonal grids are eonsidered. A common feature for all diseretizations is the ability to handle media inhomogeneities in combination with full tensor anisotropy.
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Generalized Well Models for Accurate Coarse Grid Simulation of Coning Processes
By S. EkrannThe paper identifies mechanisms reducing the accuracy of coarse grid coning simulations, and demonstrates remedies: A generalized weIl model increases the accuracy of the pressure solution in the vicinity of a well, and reacts to repositioning of the well inside the weIlblock. VE capillary pressure pseudos correct for underestimation of gravity forces. Together, these two techniques provide for dramatically improved simulation accuracy in a 2D threephase test problem with a horizontal well, in particular if the weIl is located centrally in the wellblock, or moved upwards or downwards from that position.
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Well Modelling in Reservoir Simulation
By Y. DingWell model plays an important role in reservoir simulation, because the precision of weIl flow rate or bottom hole pressure calculation is directly related to this model.
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A Streamline Simulator to Model Field Scale Three-Dimensional Flow
Authors R. P. Batycky, M. R. Thiele and M. J. BluntWe present a streamline method to model convective-dominated displacements in heterogeneous porous media.
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Linearization Techniques of Reservoir Simulation Equations - IMPES/IMPEM Cases
By É. FarkasThe main object of this paper is to exarnine and compare models based on the numerical background of linearization techniques.
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The "Front Limitation" Algorithm - A New Simulation Technique for the Advection - Dispersion Problems
Authors S. Wagner, F. Haefner, S. Boy, A. Behr, V. Piskarev, B. Palatnik and C. BrandThe simulation of multi-phase compositional problems requires the numerical solution of the advection - dispersion equation. Until now the main difficulties were: (1) the mixed types of equation (parabolic and hyperbolic) and (2) the limits in block size and time steps (grid PECLET number, COURANT number). In this paper a new algorithm (named the FRONT LlMITATION) is demonstrated which avoids most of the difficulties.
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A Massively Parallel Reservoir Simulator
Authors J. Frøyen and M. EspedalA two-phase sequential IMPLICIT three dimensional reservoir simulator has been developed for massively parallel computer systems. The parallel algorithm is based on recently developed domain decomposition methods. The simulator has been tested using a 16384 processor MasPar MP-4.10.
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