Application of the unstructured grids in the numerical simulation of fractured horizontal wells in ultralow permeability gas reservoirs. This work presents the implementation of an ebfvm formulation using unstructured grids for tridimensional compositional reservoir simulation in conjunction with an impec approach. This is constructed around a set of solution points that need have no particular indexing scheme. Next we describe the techniques used for grid generation both in. Deutsch an outstanding issue in geostatistics research is the extension of modeling algorithms to unstructured grids, which are being used for reservoir flow analysis. Symmetric positive definite fluxcontinuous fulltensor finitevolume schemes on unstructured cellcentered triangular grids. An element based conservative scheme using unstructured. Application of fluxcorrected transport to an unstructured. Pdf unstructured coarse grid generation for reservoir. This new simulator is designed to handle miscible gas flooding, chemical flooding, and thermal flooding processes for conventional and unconventional reservoirs. The convergence characteristic of fmm on unstructured grids is investigated. Unstructured, controlvolume distributed, fulltensor. In this paper, new developments for grid generation, upscaling and streamline simulation for such models are described. 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.
Pdf well indices for complex well configurations in. Fault modelling aspects using unstructured grid with a. For simpler problem such as airfoil single element or an isolated wing, structured grids are generally more accurate per unknown than unstructured. Introduction one of the main goals of petroleum industry is to maximize oil production from each. Pdf a tvd scheme for 3d unstructured grids applied to. White nasa langley research center, hampton, va 23681 the synthesis of physical models for gas chemistry and turbulence from the structured grid codes laura and vulcan into the unstructured grid code fun3d is described. Unstructured coarse grid generation for reservoir flow simulation using background grid approach. The methods are applicable for any system of conservation laws where the flow density is defined by a gradient law, like darcys law for porousmedia flow. This thesis provides a grid construction tool to generate highresolution unstructured meshes using voronoi grids, which continue reading. Anisotropic mesh adaptation for 3d anisotropic diffusion problems with application to fractured reservoir simulation. Unlike structured grids, unstructured grids require a list of the connectivity which specifies the way a given set of vertices make up individual elements see graph data structure. Using unstructured grids for modeling complex discrete fracture. Pdf unstructured gridding and consistent discretizations for. Discretization on unstructured grids for inhomogeneous, anisotropic media.
Application of unstructuredirregular grids in reservoir simulation is one of the most important concepts that have been developed in the past decade 1. A control volume scheme for flexible grids in reservoir simulation, spe 37999, in. Corner point grids and pillar based unstructured grids do not provide an effective workflow for translating earth models into simulation models. In combination, these techniques provide a prototype workflow for the construction of unstructured simulation models. Complex, unstructured grids with many obscure challenges. Knutandreas lie an introduction to reservoir simulation using matlab user guide for. Introduction simulation of oil field development is traditionally performed using fullscale filtration models roxar tempest. By doing such thing, the cells of the reservoir are modi. 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. The method employs unstructured grids using triangular andor quadrilateral elements, such that complex re. A streamline simulation technique for the efficient modeling of flow and transport on unstructured grids is presented. T1 2d compositional reservoir simulation using unstructured grids in heterogeneous reservoirs jo blucher mechanical engineering proceedings vl 1 is 1 sp 1455 ep 1474 py 2014 t2 10th world congress on computational mechanics au b. The toolbox is intended for rapid prototyping on complex cornerpoint grids and demonstration of the multiscale simulation.
The fully implicit solution method has been successfully applied to reservoir simulation with unstructured grids. Use next generation simulators that honors geology with unstructured grids. Upscaled unstructured computational grids for efficient simulation of flow in fractured porous media. Introduction to reservoir simulation as practiced in industry. Unstructured grids for modeling reservoirs chevron u. Abstract in the last decade, unstructured grids have been a very important step in the development of petroleum reservoir simulators. The first release is geared towards single and twophase flow and contains a set of mimetic and multiscale flow solvers and a few simple transport solvers capable of handling general unstructured grids.
Computational aerothermodynamic simulation issues on. We encourage you to also look at the many publications that use mrst. This paper presents new results for applying the sequential solution method to the blackoil reservoir simulation with unstructured grids. Paper 1, ccg annual report 11, 2009 2009 11 algorithms for unstructured grids john g. The structure of unstructured grids centre for computational. Pebigrids used for reservoir simulations are discussed by verma and. The problems involved in using a regular structured grid to represent reservoir geometry can be avoided by using an unstructured grid. Reservoir evaluation can be broken into two main categories.
Shalegas reservoir simulation tightgas reservoir simulation. Reservoir simulation is efficiently computed based on the drainage volume information from the unstructured grid system using fmm, and the simulation results are validated with finitedifference based and finitevolume based numerical results. We have exploited this concept in order to develop a new method for the generation of unstructured computational grids. In this work a numerical model for simulating petroleum reservoirs using the elementbased finite volume method ebfvm is presented. This tool can be used to provide the flowbased assessment of the coarse model. 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. Upscaled unstructured computational grids for efficient. Gataul linmodeling of hydraulically fractured wells in full field reservoir simulation model 2008 spe 117421. Reservoir simulation is an area of reservoir engineering in which computer models are used to predict the flow of fluids typically, oil, water, and gas through porous media under the model in the broad scientific sense of the word, they understand a real or mentally created structure that reproduces or reflects the object being studied. Structured versus unstructured pebi grids in reservoir modeling and simulation bogdan balan, schlumberger gss abstract application of unstructuredirregular grids in reservoir simulation is one of the most important concepts that have been developed in the past decade 1. Numerical modeling of fractured shalegas and tightgas reservoirs using unstructured grids. A popular unstructured grid is the perpendicular bisector pebi grid. Computational aerothermodynamic simulation issues on unstructured grids peter a.
The generation of accurate and reliable unstructured 3d models for reservoir simulation remains a challenge. Although the use of unstructured grids for fluid flow simulation in complex geometries is currently a customary practice in several engineering areas, still little effort has been made in the. Geometry approaches, are widely used in the reservoir simulation. Deutsch to move forward with the use of unstructured grids in modeling reservoirs, geostatistical methods to. Fulltensor finitevolume schemes with flow based grids. New modeling approaches based on hierarchical functional form representation and novel. Spe rss aim clees ganzer 20061204 tc clean fraunhofer scai.
Although simple to use, conventional cartesian grids, commonly employed in petroleum reservoir simulation, cannot produce accurate modeling of most of the aforementioned geometric features. Structured versus unstructured pebi grids in reservoir modeling. Pdf this paper presents a 2d implementation of an elementbased finite volume formulation ebfvm using triangles, quadrilaterals, or a. Significant work has been done for generating unstructured grids. Modeling scalar variables on unstructured grids john g. Embodiments of the present invention utilize a geochron model for construction of the simulation grids. Unstructured gridding has become an important subject matter in reservoir simulation. Modern reservoir simulation faces increasingly complex physical models and highly resolved, unstructured grids. Though this concept was introduced to the petroleum industry as. Globally structured grids, including the socalled stratigraphic or cpg corner point. In this talk, we present a new integrated approach to reservoir modeling and simulation by using unstructured grids and other novel modeling techniques. Numerical modeling of fractured shalegas and tightgas. It requires a 3d unstructured grid approach that allow an accurate representation of the near well flow and preserving geological accuracy and offering flexible resolution control. Discretization methods are proposed for controlvolume formulations on polygonal and triangular grid cells in two space dimensions.
We first present the basic issues and workflow for reservoir simulation with unstructured grids. The construction of simulation grids, such as the unstructured cutcell grid shown in fig. Petroleum reservoir simulation using super element method. Application of the unstructured grids in the numerical. Currently, this type of grids is being gradually adopted in reservoir simulation, because actual petroleum reservoirs frequently exhibit such complex geometries and intricate geological features that only can be represented accurately with unstructured grids. Transmissibility upscaling on unstructured grids for highly. Rupperts algorithm is often used to convert an irregularly shaped polygon into an unstructured grid of triangles. An extension for unstructured grids is described that leads to a general symmetric positive definite discretization matrix for both quadrilateral and triangular grids. Rapid simulation of naturally fractured unconventional. Well indices for complex well configurations in unstructured grids. Structured versus unstructured pebi grids in reservoir. Pdf this paper presents a 2d implementation of an elementbased finitevolume formulation ebfvm using triangles, quadrilaterals, or a.
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. The matlab reservoir simulation toolbox mrst sintef. The objective of this project is to develop a reservoir simulator with the capability of simulating various recovery processes under one framework. The use of unstructured meshed has proven to be a valuable tool for reservoir. 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. Advanced discretization methods for flow simulation using. Hybrid mesh generation for reservoir flow simulation in. 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. A tvd scheme for 3d unstructured grids applied to compositional reservoir simulation article pdf available in brazilian journal of chemical engineering 344. An elementbased finite volume formulation for reservoir. The first application of unstructured grids in the petroleum reservoir area. In the new approach the geological model gm of the reservoir is first generated, using square or cubic grid. Discretization on unstructured grids for inhomogeneous. High performance compositional 3d reservoir simulation in conjunction with unstructured grids cilamce 2017 proceedings of the xxxviii iberian latinamerican congress on computational methods in engineering.
855 1179 1109 1435 1346 1142 650 353 111 183 1123 1497 691 931 1492 210 714 1324 544 805 612 902 378 575 1011 206 275 230 776 1373 1095 1003 935 32 539 292 196 330