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. 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. The finite volume grid is formed as the dual of the underlying tetrahedral in three dimensions or triangular in two dimensions primal grid. Unstructured gridding has become an important subject matter in reservoir simulation. Reservoir evaluation can be broken into two main categories. Unstructured coarse grid generation for reservoir flow simulation using background grid approach. For simpler problem such as airfoil single element or an isolated wing, structured grids are generally more accurate per unknown than unstructured. The first application of unstructured grids in the petroleum reservoir area. 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. Though this concept was introduced to the petroleum industry as. Deutsch an outstanding issue in geostatistics research is the extension of modeling algorithms to unstructured grids, which are being used for reservoir flow analysis.
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. New modeling approaches based on hierarchical functional form representation and novel. The objective of this project is to develop a reservoir simulator with the capability of simulating various recovery processes under one framework. 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. Application of fluxcorrected transport to an unstructured. 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. Complex, unstructured grids with many obscure challenges. Computational aerothermodynamic simulation issues on unstructured grids peter a. Transmissibility upscaling on unstructured grids for highly. However, for more complex flows, the adaptivity facilitated by an unstructured grid may allow more accurate solutions. The method employs unstructured grids using triangular andor quadrilateral elements, such that complex re. Upscaled unstructured computational grids for efficient simulation of flow in fractured porous media. Modeling scalar variables on unstructured grids john g.
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. We encourage you to also look at the many publications that use mrst. A tvd scheme for 3d unstructured grids applied to compositional reservoir simulation article pdf available in brazilian journal of chemical engineering 344. Spe rss aim clees ganzer 20061204 tc clean fraunhofer scai. In the new approach the geological model gm of the reservoir is first generated, using square or cubic grid. An element based conservative scheme using unstructured. This tool can be used to provide the flowbased assessment of the coarse model. In this paper, new developments for grid generation, upscaling and streamline simulation for such models are described. 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.
This thesis provides a grid construction tool to generate highresolution unstructured meshes using voronoi grids, which continue reading. Fault modelling aspects using unstructured grid with a. Petroleum reservoir simulation using super element method. Application of the unstructured grids in the numerical. Use next generation simulators that honors geology with unstructured grids. Introduction simulation of oil field development is traditionally performed using fullscale filtration models roxar tempest. This new simulator is designed to handle miscible gas flooding, chemical flooding, and thermal flooding processes for conventional and unconventional reservoirs. 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. Abstract in the last decade, unstructured grids have been a very important step in the development of petroleum reservoir simulators. Well indices for complex well configurations in unstructured grids.
Currently, there is little consensus regarding the effects of nonideal fracture geometries and coupled primarysecondary fracture interactions on reservoir performance in these unconventional gas reservoirs. The toolbox is intended for rapid prototyping on complex cornerpoint grids and demonstration of the multiscale simulation. Rapid simulation of naturally fractured unconventional. Deutsch to move forward with the use of unstructured grids in modeling reservoirs, geostatistical methods to. Opensource matlab implementation of consistent discretisations on complex grids. Pebigrids used for reservoir simulations are discussed by verma and. A streamline simulation technique for the efficient modeling of flow and transport on unstructured grids is presented. An extension for unstructured grids is described that leads to a general symmetric positive definite discretization matrix for both quadrilateral and triangular grids. Pdf unstructured coarse grid generation for reservoir. Upscaled unstructured computational grids for efficient. Introduction one of the main goals of petroleum industry is to maximize oil production from each. We first present the basic issues and workflow for reservoir simulation with unstructured grids. 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.
Symmetric positive definite fluxcontinuous fulltensor finitevolume schemes on unstructured cellcentered triangular grids. 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 popular unstructured grid is the perpendicular bisector pebi grid. Significant work has been done for generating unstructured grids. Discretization methods are proposed for controlvolume formulations on polygonal and triangular grid cells in two space dimensions. Knutandreas lie an introduction to reservoir simulation using matlab user guide for. 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. In this talk, we present a new integrated approach to reservoir modeling and simulation by using unstructured grids and other novel modeling techniques. Discretization on unstructured grids for inhomogeneous. Globally structured grids, including the socalled stratigraphic or cpg corner point. Paper 1, ccg annual report 11, 2009 2009 11 algorithms for unstructured grids john g. 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. This work presents the implementation of an ebfvm formulation using unstructured grids for tridimensional compositional reservoir simulation in conjunction with an impec approach. An elementbased finite volume formulation for reservoir.
Next we describe the techniques used for grid generation both in. Pdf this paper presents a 2d implementation of an elementbased finite volume formulation ebfvm using triangles, quadrilaterals, or a. By doing such thing, the cells of the reservoir are modi. Pdf this paper presents a 2d implementation of an elementbased finitevolume formulation ebfvm using triangles, quadrilaterals, or a. Numerical modeling of fractured shalegas and tightgas reservoirs using unstructured grids. Advanced discretization methods for flow simulation using. The generation of accurate and reliable unstructured 3d models for reservoir simulation remains a challenge. Unstructured grids for modeling reservoirs chevron u. Gataul linmodeling of hydraulically fractured wells in full field reservoir simulation model 2008 spe 117421. The use of unstructured meshed has proven to be a valuable tool for reservoir. This is constructed around a set of solution points that need have no particular indexing scheme. 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 matlab reservoir simulation toolbox mrst sintef. The convergence characteristic of fmm on unstructured grids is investigated.
Introduction to reservoir simulation as practiced in industry. Using unstructured grids for modeling complex discrete fracture. Fulltensor finitevolume schemes with flow based grids. 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. 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.
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. Unstructured, controlvolume distributed, fulltensor. Pdf unstructured gridding and consistent discretizations for. The structure of unstructured grids centre for computational.
Hybrid mesh generation for reservoir flow simulation in. The problems involved in using a regular structured grid to represent reservoir geometry can be avoided by using an unstructured grid. Structured versus unstructured pebi grids in reservoir. Pdf a tvd scheme for 3d unstructured grids applied to. Although simple to use, conventional cartesian grids, commonly employed in petroleum reservoir simulation, cannot produce accurate modeling of most of the aforementioned geometric features. A control volume scheme for flexible grids in reservoir simulation, spe 37999, in. Computational aerothermodynamic simulation issues on.
The construction of simulation grids, such as the unstructured cutcell grid shown in fig. 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. Corner point grids and pillar based unstructured grids do not provide an effective workflow for translating earth models into simulation models. Numerical modeling of fractured shalegas and tightgas. Structured versus unstructured pebi grids in reservoir modeling. This paper presents new results for applying the sequential solution method to the blackoil reservoir simulation with unstructured grids. Application of unstructuredirregular grids in reservoir simulation is one of the most important concepts that have been developed in the past decade 1. Discretization on unstructured grids for inhomogeneous, anisotropic media. Embodiments of the present invention utilize a geochron model for construction of the simulation grids. Application of the unstructured grids in the numerical simulation of fractured horizontal wells in ultralow permeability gas reservoirs. 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. Geometry approaches, are widely used in the reservoir simulation. Modern reservoir simulation faces increasingly complex physical models and highly resolved, unstructured grids.
1539 356 1602 1160 199 708 541 297 1605 381 780 709 36 1584 954 1489 448 537 795 1068 247 793 1041 687 576 42 436 795 456 1069 525