There are several open source platforms available for this work, including fluidity at imperial college, or dumux, which is a leading software framework for modeling single and multiphase flow. Tough2csm is fully implicit, threedimensional, utilizes an unstructured grid, and is parallelized. I am currently implementing a vof method a geometrical method for two phase flow simulation on eulerian mesh that is native to structured grid, on an unstructured grid, so here are my experiences so far please note that what im writing comes from working with a. Spe reservoir simulation symposium the woodlands, texas, usa, 20, 9951007. Sagd in a naturally fractured reservoir with a discrete fracture network modeled through a series of unstructured local grid refinements to capture flow through fractures.
The completion of the reservoir simulation software using the impes and fullimplication methods is on the grid management system. Rock flow dynamics tnavigator supports black oil, compositional and thermal compositional simulations for workstations and high performance computing clusters. Any unstructured geogrid model can also be used with sensor if it can provide pore volumes and transmissibilities in the context of neighbor and nonneighbor connections in a structured grid. Structured versus unstructured pebi grids in reservoir. 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. Pdf this paper presents a 2d implementation of an elementbased finite volume formulation ebfvm using triangles, quadrilaterals, or a. May 15, 2014 an earth model of a subsurface reservoir having an unstructured tetrahedral grid defining a plurality of tetrahedral cells that conform to geological discontinuities is provided.
Deutsch unstructured grids are an efficient data structure in regards to reservoir flow simulation analysis. Depogrid enables geologists and geomodelers to capture all the different unconformities and changes on the structure of the reservoir with high levels of detail. An earth model of a subsurface reservoir having an unstructured tetrahedral grid defining a plurality of tetrahedral cells that conform to geological discontinuities is provided. The unstructured voronoi numerical model is common to saphir, topaze and rubis, only the local grid refinement around the wells will be different. Another approach for the simulation of fluid and heat flow in reservoirs is the unstructured gridding as it is e. A popular unstructured grid is the perpendicular bisector pebi grid. Unstructured grids for numerical reservoir simulation using tough2 for gas storage article in oil gas european magazine 384. Abstract in the last decade, unstructured grids have been a very important step in the development of petroleum reservoir simulators. The grid in reservoir modeling module and gridding module are all created from the watertight structural framework, which enables the structure of the reservoir property model to be consistent with the structure of the numerical simulation grid, honoring to high levels of accuracy the complete structural framework. Parallel scalable unstructured cprtype linear solver for. New insight with highresolution reservoir simulation.
Calculations of static and dynamic reservoir properties will build on extensive experience in unstructured grid reservoir simulation at hwu and icl. The worlds fastest and most robust fullphysics reservoir simulator. Us8437996b2 us12682,731 us68273108a us8437996b2 us 8437996 b2 us8437996 b2 us 8437996b2 us 68273108 a us68273108 a us 68273108a us 8437996 b2 us8437996 b2 us 8437996b2 authority. This work presents the implementation of an ebfvm formulation using unstructured grids for tridimensional compositional reservoir simulation in conjunction with an impec approach. The objective of this project is to develop a reservoir simulator with the capability of simulating various recovery processes under one framework. The reservoir simulation chapter in the 1987 edition of the petroleum engineering handbook included a general description of reservoir simulation models, a discussion related to how and why they are used, choice of different types of models for different reservoir problems, and reliability of simulation results in the face of model assumptions. The first application of unstructured grids in the petroleum reservoir area. A distributed unstructured grid infrastructure has been developed for models using unstructured or complex structured grids. A common requirement in reservoir simulation is an increased level of detail around an item of interest such as a well. Structured versus unstructured pebi grids in reservoir modeling. In addition to surfacesubsurface simulation, the reservoir simulator provides a parallel unstructured grid capability and significant computational efficiency from a improved model formulation. Parallel scalable unstructured cprtype linear solver for reservoir simulation authors hui cao schlumberger. Typically, the 3d geologic model is in the form of a structured grid while the reservoir simulation grid is an unstructured grid.
Reservoir simulation is an area of reservoir engineering. 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. A computer program is developed to implement the numerical model. Application of the unstructured grids in the numerical. Three phase simulation with matrix and fractures flow in an unstructured grid with several hundreds of thousands nodes is performed to predict production forecast. The increasing sophistication of data preparation and solver technology indicates a move towards unstructured grids as a general method of solving the flow equations for a given reservoir simulation problem. An unstructured gridding method for densely spaced complex wells in fullfield reservoir simulation. Highly automated optimization and uncertainty workflows via integration with petrel reservoir engineering. Prevost, accurate coarse reservoir modeling using unstructured grids, flowbased upscaling and streamline simulation, ph. However, using unstructured grids for reservoir flow analysis is relatively new.
Dfn model for flow simulation in hydraulically fractured. Sensor reservoir modeling software provides unparalleled. For the simulations of this study, four stacked reservoir. Family of mpfa finitevolume schemes with full pressure support for the general tensor pressure equation on cellcentered triangular. Similar facies distribution but different grid orientation that defines how fluids will flow preferentially. Simulation of waterflooding indicates that the agreement between the results obtained with the gm and the upscaled unstructured grid is excellent. An extensible architecture for next generation scalable. Through the analysis of several methods of hydraulic fracturing numerical simulation, this study proposes using the perpendicular bisector pebi unstructured grid refinement function of the large commercial simulation software eclipse and simulating the multifracture of fracturing horizontal wells. Operators can simulate detailed geological features and quantify uncertainties, by creating accurate production scenarios and, with the integration of precise models of the surface facilities and field operations, the intersect simulator produces reliable results which are constantly updated. The reservoir system simulation hecressim software is used to model reservoir operations at one or more reservoirs for a variety of operational goals and constraints. Upscaled unstructured computational grids for efficient simulation of flow in fractured porous media.
The software has a large international user base and also includes thirdparty modules developed by researchers from heriotwatt university. 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. Grid design and numerical modeling of multiphase flow in complex. Another question is what is available to you at what cost, like. Upscaled unstructured computational grids for efficient. Proportional integral derivative pid control for temperature maintenance by varying steam injection and production rates. 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. The method is equally applicable to the simulations of multiphase flow in unfractured, but highly heterogeneous, reservoirs. Unstructured grids the choice of whether to use a structured or an unstructured mesh is very problem specific as well as companylab specific. It solves component material balance, energy balance, and mass equilibrium equations for component mole fractions, saturation, temperature, and pressure. Local grid refinements are also a feature provided by many simulators to more accurately represent the near wellbore multiphase flow effects. Highly automated optimization and uncertainty workflows via integration with petrel reservoir.
Reservoir system simulation the reservoir system simulation hecressim software is used to model reservoir operations at one or more reservoirs for a variety of operational goals and constraints. The grid in reservoir modeling module and gridding module are all created from the watertight structural framework, which enables the structure of the reservoir property model to be consistent with the structure of the numerical simulation grid, honoring to high levels of. Automatic grid setting may be modified for specific studies such as coning. Unstructured grids for numerical reservoir simulation. Tough2egs is a reservoir simulator, developed at the colorado school of mines for modeling enhanced geothermal systems egs and funded by doe and foundation energi simulation formerly foundation cmg. Also now contains the unstructuredgrid c struct and associated functions, functions for processing cornerpoint grids, the gridmanager class and other grid utilities. The sequential method for the blackoil reservoir simulation. Within the context of petroleum reservoir simulation, mpfa methods are commonly considered, as they are controlvolume based, locally conservative, introduce only one unknown per block, are applicable. Transfinite interpolation, morphing, pde based, etc. Intersect software is an unstructuredgrid, parallel, and fully implicit simulator that handles complex physics associated with heavy oil thermal recovery. There are two changes since the previous release, namely that opmsimulators now depend on ewoms, and that opmcore now depends on opmgrid instead of the other way around. The tetrahedral cells define vertices in a physical space that store information associated with a depositional space of the subsurface reservoir. Local grid refinements are also a feature provided by many simulators to more accurately represent the near. Unstructured grid optimization for improved monotonicity of discrete solutions of elliptic equations with highly anisotropic coefficients.
Unstructured grids for modeling reservoirs chevron u. Unstructured grid optimization for improved monotonicity of. Also, if the simulation requires relative motion of bodies, unstructured mesh is the choice, simply because the chimera libraries are very difficult to get military based research. Application of unstructuredirregular grids in reservoir simulation is one. The grid lines are curved to fit the shape of the boundaries unstructured grids. A method using streamlines for structured grid generation was presented by verma. Significant work has been done for generating unstructured grids for reservoir simulations. In the gridding step, the user may lay out the reservoir simulation grid on top of the 3d geologic model. The 3d plot shows saturation distribution visualized in.
The simulator is implemented using automatic differentiation to enable rapid development of new fluid models. Skua flow simulation grid bringing geology to flow simulation. Different types of grid may be used for reservoir flow simulation to model geometrically complex, highly detailed models andor deviated or multilateral wells2. Opm flow is a fullyimplicit, blackoil simulator capable of running industrystandard simulation models. Application of graph theoretic model to design of reservoir simulation software based on grid.
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. This is frequently obtained in structured grids by local grid refinement, replacing a set of cells in the original grid by a finer grid fig. Total simulates very large and heterogeneous sagd model in. 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. Finally the results of our software are tested to verify its validity in theory, algorithm, and efficiency in calculation. Us7584086b2 characterizing connectivity in reservoir. The properties of pebigrids used for reservoir simulations are discussed by verma and aziz 1997. Although simple to use, conventional cartesian grids, commonly employed in petroleum reservoir simulation, cannot produce accurate modeling of most of the aforementioned geometric features. The 3d plot shows saturation distribution visualized in resinsight. This new simulator is designed to handle miscible gas flooding, chemical flooding, and thermal flooding processes for conventional and unconventional reservoirs. On the other hand, reservoir simulation is increasingly seen as part of a decisionmaking process rather than an isolated activity, so the ability to map easily onto the generally regular data structures used in seismic and geological modeling becomes an important issue. The aim of gridding in reservoir simulation is to turn the geological model of the field into a discrete. Tightflow benefits from the knowhow of the pumaflow multipurpose reservoir simulator.
The software has a large international user base and also includes thirdparty modules developed by researchers from heriotwatt university, ntnu, university of bergen, tno, and tu delft. Tightflow production optimization of unconventional and. Unstructured grid optimization for improved monotonicity. They offer several advantages including accurate representation of complex geological entities and near well. The reservoir simulation grid may have larger cells with irregular shapes. Grid types are often labeled based on their structure. Us7584086b2 characterizing connectivity in reservoir models. Unstructured grids for numerical reservoir simulation using.
The intersect highresolution reservoir simulator is the answer to many of your reservoir challenges. The matlab reservoir simulation toolbox mrst sintef. The unstructured nature of the gridding depogrid models are simulated by the intersect simulator to capture the effects on fluid flow. The structure of unstructured grids centre for computational. We k coupling an industrial reservoir simulator and. There are two changes since the previous release, namely that opmsimulators now depend on ewoms, and that opmcore now depends on opm grid instead of the other way around. Threedimensional unstructured grid generation methods are proposed that automate controlvolume. Flow simulations of reservoir systems with complex geometries and. Theoretically, finite difference models permit discretization of the reservoir using both structured and more complex unstructured grids to accurately represent the geometry of the reservoir. The skua flow simulation grid module enables geoscientists and engineers to construct 3d reservoir grids that are optimal for numerical flow simulation.
Nexus run simulations of fluid flow for one or multiple assets, and model the reservoir, wells, and surface and subsurface facilities as a single system for the most comprehensive. Application of graph theoretic model to design of reservoir. The inserted grid may be cartesian center or radial upper left. These grids are true to the interpreted geology both in terms of structure and stratigraphy. Mrst is a free opensource software for reservoir modelling and simulation, developed primarily by the computational geosciences group in the department of mathematics and cybernetics at sintef digital. Today, the ability to routinely simulate a wide spectrum of. The grid forms automatically and with the minimum number of cells for faster simulations. The fully implicit solution method has been successfully applied to reservoir simulation with unstructured grids. Build full nexus simulation decks or import existing files for editing, and generate the complete set of input files needed for nexus reservoir simulation. Geometry modeling grid generation stanford university. Rexcel is a reservoir simulation preprocessor designed specifically for the reservoir engineer.
Though this concept was introduced to the petroleum industry as. Use next generation simulators that honors geology with unstructured grids. The figure below shows the situation for release 2016. This paper presents new results for applying the sequential solution method to the blackoil reservoir simulation with unstructured grids. Many software, private, open source or commercial, are available for reservoir simulation. Unconventional wells such as maximum reservoir contact wells and fishbone wells, as well as faults and fractures are handled by the new gridding system. The matlab reservoir simulation toolbox, provides new methods and concepts on unstructured grids, can be applied to large and complex systems. Black oil applied simulation tool, it is a numerical simulator to estimate the pressure destitution for a certain time to calculate the saturation destitution. Third party tools for the sensor reservoir simulator. Calculations of static and dynamic reservoir properties will build on extensive experience in unstructuredgrid reservoir simulation at hwu and icl. Dynamic flowbased pebi grids for reservoir simulation onepetro.
Dfn model for flow simulation in hydraulically fractured wells with preexisting natural fractures using unstructured quadrilateral grids authors. The need for unstructured grids can arise locally when modeling complex. 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. In this model, structured grid models are handled as a subset of unstructured models and the simulator is written for an unstructured grid without any specific code to deal with structured topologies except on input and output, in order to fit within the current generation of workflow tools.
795 1368 802 1067 537 869 182 874 911 932 348 1315 1494 544 451 1330 898 622 1299 1459 127 625 375 481 303 732 1466 1396 1089 879 1156 432 610 852 1113 1269 607 960 283 975 1289 1040