Pebigrids used for reservoir simulations are discussed by verma and. Hybrid mesh generation for reservoir flow simulation in cpg grids 419 cpg grid, the cell faces are aligned with the geological structures of the real reservoir. Transmissibility corrections and grid control for shale. Transmissibility upscaling on unstructured grids for highly. Sepehnoori 3d reservoir simulation using unstructured grid from figure 5, it is possible to verify that the saturation field at upper and lower surface of the reservoir obtained with both grid configurations are in good match.
Highquality grids guarantee the fidelity of a reservoir model and keep the flow calculations simple. Juanes, spe, massachusetts institute of technology, h. Reservoir simulation provides a practical approach to characterize key reservoir parameters in this process such as temperature. Generalized traveltime inversion on unstructured grids. University of alberta reservoir geomechanics research group rg2 energi simulation industrial research consortia in reservoir geomechanics for unconventional resources coupled hydromechanical simulation of multiphase fluid flow in fractured shale reservoirs using distinct. Basic geological modeling features handling of well log data. This work presents the implementation of an ebfvm formulation using unstructured grids for tridimensional compositional reservoir simulation in conjunction with an impec approach.
Globally structured grids, including the socalled stratigraphic or cpg corner point. Abstract in the last decade, unstructured grids have been a very important step in the development of petroleum reservoir simulators. Geostatistical models of reservoir properties can be hundreds of millions of cells. Grid design and numerical modeling of multiphase flow in. The grid lines are curved to fit the shape of the boundaries unstructured grids. For this aspect of the problem, we generalize streamline simulation techniques to unstructured grids.
Cell indices and coordinate indices in a structured grid 23. Tracing streamlines on unstructured grids from finite volume discretizations s. Geometry approaches, are widely used in the reservoir simulation. Distributed unstructured grid infrastructure for complex. Calculation of permeability tensors for unstructured grid. The generation of accurate and reliable unstructured 3d models for reservoir simulation remains a challenge.
Eos2 fluid property module of tough2 simulation codes is used for the numerical simulation of the geothermal model. Pdf unstructured coarse grid generation for reservoir. Use next generation simulators that honors geology with unstructured grids. Tracing streamlines on unstructured grids from finite. Pdf this paper presents a 2d implementation of an elementbased finitevolume formulation ebfvm using triangles, quadrilaterals, or a. Geometry modeling grid generation stanford university. Ebfvm, chemical compositional model, unstructured grid, petroleum reservoir simulation.
In this paper two automated and robust algorithms for generation of unstructured grids suitable for multiscale finite volume method in oil reservoirs are presented. Unstructured cutcell grids for modeling complex reservoirs. Stanfords general purpose research simulator gprs serves as the base for the new framework. Sepehrnoori1 1center for petroleum and geosystems engineering, the university of texas at austin, usa. Introduction to reservoir simulation as practiced in industry. Evazi, spe, sharif university of technology, and h. Rozon 1989 used the cvfem control volume finite element method, developed originally by. Coupled hydromechanical simulation of multiphase fluid. A popular unstructured grid is the perpendicular bisector pebi grid. Grid generation is critical to numerical reservoir simulations.
In this paper, new developments for grid generation, upscaling and streamline simulation for such models are described. The use unstructured meshes in reservoir simulation date from the 1980 decade. Reservoir evaluation can be broken into two main categories. Previously, an unstructured grid reservoir simulation workflow is introduced ding et al. This presented work introduces an enhanced way of complex fracture modeling in unconventional reservoir simulation by using unstructured. Using unstructured grids for modeling complex discrete. This paper describes a practical method in which irregular or locally irregular grids are used in reservoir simulation with the advantages of flexible approximation of reservoir geometry and. With time, growing interest in surface and groundwater interactions, local refinement with nested and unstructured grids, karst groundwater flow, solute transport, and saltwater intrusion. Transfinite interpolation, morphing, pde based, etc.
Automated workflow for unstructured grid reservoir simulation. Pdf a tvd scheme for 3d unstructured grids applied to. The matlab reservoir simulation toolbox mrst sintef. The definition of position and shape of subdomain boundaries is an open. Structured versus unstructured pebi grids in reservoir modeling and simulation bogdan balan, schlumberger gss abstract application of unstructured irregular grids in reservoir simulation is one of the most important concepts that have been developed in the past decade 1. However, the inversion method can be implemented on top of any simulator on a cartesian grid that outputs velocity.
Unstructured grid model of naturally fractured reservoir sun and schechter. Grid generation techniques structured grids ordered set of locally orthogonal lines several techniques can be used to map a computational domain into a physical domain. For reservoir simulation using the blackoil model on unstructured grids, only the fully implicit solution method has been used for solving the governing equations of this. Unstructured coarse grid generation for reservoir flow simulation using background grid approach conference paper pdf available january 2009 with 105 reads how we measure reads. Request pdf distributed unstructured grid infrastructure for complex reservoir simulation it is now standard practice to use reservoir simulation as an everyday tool for better engineering and. Application of fluxcorrected transport to an unstructuredgrid finitevolume formulation for reservoir simulation fernando s. The multiscale finite volume method is an efficient numerical method for flow simulation in porous media. Benefits of using unstructured grid are demonstrated on simulation example by using unstructured grid and being compared with the structured grid.
In combination, these techniques provide a prototype workflow for the construction of unstructured simulation models. Basics of reservoir simulation with the eclipse reservoir simulator. Pdf this paper presents a 2d implementation of an elementbased finite volume formulation ebfvm using triangles, quadrilaterals, or a. In this thesis, unstructured grid models, which include high resolution in the well and nearwell region, are constructed and used to simulate condensate systems. Unstructured gridding has become an important subject matter in reservoir simulation. Calculation of permeability tensors for unstructured grid blocks r. Unstructured grid simulation of hydromechanical effects in fractured reservoir during co2 sequestration ukccs community network early career researcher winter school 8th 11th february 2011 imperial college london robert annewandter ecosse phdcandidate prof sebastian geiger institute of petroleum engineering heriotwatt university prof ian main. Figure 2 voronoi grid closeup on hydraulic fractures as a starting point, let us further assume that the gas pvt has constant viscosity and. Application of parallel computing techniques to a largescale reservoir simulation keni zhang, yushu wu, chris ding, and karsten pruess. Application of fluxcorrected transport to an unstructured. Alternatively, a full 3d unstructured grid may be defined. An advanced grid system design was developed to capture accurately the effects of geometrically complex features such as geological features faults, pinch outs and inclined beddings and wellrelated phenomenon multilateral wells of general orientation in triangular coordinates. Structured versus unstructured pebi grids in reservoir.
An unstructured grid may be defined in two dimensions, and then applied to each layer of a reservoir model, so that a typical cell is a hexagonal prism. Modeling these effects can have significant impact on the accuracy of the simulation and prediction of reservoir. This technique is defined by the storage of all physical properties at the. An embedded 3d fracture modeling approach for simulating. We first present the basic issues and workflow for reservoir simulation with unstructured grids. The book also teaches grid coarsening, upscaling, and flow diagnostics. The simulation results can be saved as e100 binaries to link the simulator with the software in your workflow. Though this concept was introduced to the petroleum industry as. Hybrid mesh generation for reservoir flow simulation in.
By doing such thing, the cells of the reservoir are modi. For over 30 years, the modflow program has been widely used by academics, private consultants, and government scientists to accurately, reliably, and efficiently simulate groundwater flow. In this paper, we discuss how to extend the gtt inversion method to fully unstructured grids in two and three spatial dimensions. A method, apparatus, and program product utilize a generalized grid cell pinchout operation to remove small cells from a reservoir simulation grid, e. One major component of the workflow is the nearwell unstructured grid modeling framework which consists of a 2. Unstructuredcoarsegrid generation using backgroundgrid. Transmissibility corrections and grid control for shale gas numerical simulation p 323 figure 1 voronoi grid for the reservoir described in table 1. The structure of unstructured grids centre for computational.
Basics of reservoir simulation with the eclipse reservoir. Pdf unstructured gridding and consistent discretizations for. Reservoir simulation is an area of reservoir engineering that, combining physics, mathematics, and computer programming to a reservoir model allows the analysis and the prediction of the fluid behavior in the reservoir over time it can be simply considered as the process of mimicking the behavior of fluid flow in a. Application of fluxcorrected transport to an unstructuredgrid finitevolume form ulation for reservoi r simulation conference paper pdf available june 2007 with 67 reads how we measure reads. Grid as in figure 33, but with fault 106 figure 36. The use of structured grids in reservoir simulation is very. The nextgeneration reservoir simulators will be unstructured. Unstructured coarse grid generation for reservoir flow simulation using background grid approach.
Using unstructured grids for modeling complex discrete fracture. The development of a generalpurpose reservoir simulation framework for coupled systems of unstructured reservoir models and advanced wells is the subject of this dissertation. Computational fluid dynamics in hydraulic and sedimentation engineering by nils reidar b. A tvd scheme for 3d unstructured grids applied to compositional reservoir simulation article pdf available in brazilian journal of chemical engineering 344. The natural state model of the field is obtained by running the simulation for a long time until the reservoir parameters are reached to stabilized conditions. Advanced discretization methods for flow simulation using.
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