Local grid refinement lgr is applied in reservoir simulation routinely for structured and unstructured grids and implemented in commercial simulators. Reservoir simulation is a key tool to get insight in complex fluid flow phenomena occurring in many petroleum reservoirs, creating the possibility to quantify fluid productions and their uncertainty regarding many unknown. Interblock transmissibility calculation analysis for petroleum reservoir simulation. Pdf local grid refinement is a technique which aims to provide improved accuracy in subregions of a reservoir simulation study. In this paper, we adopt the strategy of regular local grid refinement see, e. Natural fractured reservoir engineering phdg textbooks in preparation, intended to be issued during 2015. Then the discretization method used is based on the finite volume technique by approximation of the balance equation over each grid cell see 9, 15, 16, 21. When this is done in conventional simulators, unnecessary refinement occurs in other regions. A nonlinear multigrid algorithm is proposed for solving the coupling between coarse and fine meshes. Local grid rehernent for multiscale geothermal reservoir simulation with tough2 julio garcia and karsten pruess earth sciences division may 2000. Numerical simulation of the impact of polymer rheology on.
This problem is avoided by the use of local grid refinement lgr techniques, but the resulting matrix is large and of irregular sparsity. To minimize simulation time, local grid refinement lgr techniques have been introduced. Psoptimal gridding selection for fieldscale reservoir simulation of a channelized deepwater system casey meirovitz. Local grid rehernent for multiscale geothermal reservoir. The make local grids process, also known as local grid refinement lgr. Simulation of petroleum reservoir performance refers to the construction and operation of a model whose. Discretization and gridding in reservoir simulation 2. To reduce the impact of polymer rheology upon chemical eor simulations, we used an ef. Mathematics and computers in simulation, elsevier, 2014, volume 118, pp. It is used to add detail where justified by data availability and to keep a coarse resolution where less data are available. Dec 11, 2018 fieldscale simulation of flow in porous media in presence of incomplete mixing demands for highresolution computational grids, much beyond the scope of stateoftheart simulators. Potashev kazan volga region federal university, kazan, russia abstract. From microseismic to simulation a horn river case study o joint paper with cmg and nexen iptc14940 evaluation in data rich fayatteville shale gas plays integrating physicsbased reservoir simulations with data driven approaches for. The most efficient way to model and simulate flow in those regions relies on the use of local grid refinement lgr.
Sep 15, 2016 one challenge of the estimation of the recovery is to properly model complex hydraulic fracture geometries which are often assumed to be planar due to the limitation of local grid refinement approach. The applications may also involve highly localized phenomena which can be addressed via local and adaptive grid refinement techniques. Calculating well deliverability in gas condensate reservoirs. Pdf flow simulation using local grid refinements to model. Adaptive local mesh refinement and multi grid solution methods in numerical reservoir simulation by g. Abbaszadeh has extensive reservoir simulation expertise of various field applications of simulation. The local grid refinement lgr option allows enhanced grid definition in areas needing a higher level of simulation accuracy, such as near wells or in areas of complex geology. Therefore, a simulation study was needed in order to estimate the increment in production by fracturing and to decide whether this field should be developed or not. Scalar and vector grid properties associated to cells, faces, edges and nodes activeinactive elements grids and grid properties wells represented as xyz coordinates or ijk completions faults represented over the simulation model lgr local grid refinement nnc nonneighbor connections. Optimal gridding selection for fieldscale reservoir. Systematic upscaling and local grid refinement are utilized here to optimize model construction for fieldscale reservoir performance prediction while preserving key flow. Export the case from petrel and run simulations using eclipse blackoil. In this paper, we propose a twostage method for petroleum reservoir simulation. A multigrid procedure for local grid refinement in oil.
Local grid coarsening and handling convergence problems. In this course, you will build a 3d simulation model inside petrel based on geological input data, add wells, and well control rules, create black oil fluid models and rock physics functions, submit. 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. Nearwell local space and time refinement in reservoir simulation. This article applies local grid refinements lgr integrated with. A higherorder godunov scheme coupled with dynamic local. Petrel re 2011 a stepbystep guide to defining a simulation case. Adaptive local grid refinement and multigrid in numerical reservoir. In order to explain our ideas and results better, we shall. Heinemann et al 1983 discuss dynamic grid refinement to improve the.
In addition, unstructured gridding, local grid refinement. Petrel advanced gridding and upscaling schlumberger. Reservoir simulation is a key tool to get insight in complex fluid flow phenomena occurring in many petroleum reservoirs, creating the possibility to quantify fluid productions and their uncertainty regarding many unknown properties. Application of a local grid refinement protocol to analyze the performance of reservoir systems with complex well architectures a thesis in energy and mineral engineering by liwei hu 2011 liwei hu submitted in partial fulfillment of the requirements for the degree of master of science december 2011. Grid coarsening may be used to amalgamate cells in regions of the reservoir which are less important to speed up simulation run times. Hence, the upscalingbased todd and longstaff tl approach is typically used, where coarse grid cells are employed with effective mixing fluid properties and parameters found by matching results obtained with. Interblock transmissibility calculation analysis for. In the past 15 years, numerous papers have described local grid refinement and various. This chapter introduces the local grid refinement lgr and deals with. A higherorder godunov scheme coupled with dynamic local grid refinement for flow in a porous medium a higherorder godunov scheme coupled with dynamic local grid refinement for flow in a porous medium edwards, michael g. Advanced reservoir simulation using eclipse blackoil. However, mott, r calculating well deliverability in gas condensate reservoirs. This article applies local grid refinements lgr integrated with upscaling procedures to improve the representation of highly laminated reservoirs in flow.
Efficient use of domain decomposition and local grid. Discretization and gridding in reservoir simulation. A higherorder godunov scheme coupled with dynamic local grid. The methods being test were the easy frac, schlumberger correlation, lgrtartan grid, and the conductivity filter. While preconditioned conjugate gradient methods work well for symmetric, positivedefinite matrices, other methods are necessary to treat large, nonsymmetric matrices. Another challenge in the simulation of stimulated unconventional reservoirs relates to the localization of pressure gradients around hydraulic fractures.
Reservoir numerical simulation with local refinement. Flow simulation using local grid refinements to model laminated. In reservoir simulations, nearwell regions usually require. From the point of view of reservoir simulation, the pure neumann boundary value problem is more realistic.
Basics of reservoir simulation with the eclipse reservoir simulator. In reservoir simulation, the grid size is usually too large to give. Pdf flow simulation using local grid refinements to. Local refinement of the super element model of oil reservoir. Dynamic local grid refinement for incomplete mixing in reservoir simulation. A radial grid can be embedded within a single column of grid cells in the full field model. A common requirement in reservoir simulation is an increased level of detail around an item of interest such as a well. This course introduces reservoir engineers and asset teams to the interactive petrel reservoir engineering. Ernest orlando lawrence berkeley national laboratory. Jul 12, 2012 a nested dynamic local grid refinement system is capable of determining dynamically a refined grid in an implicit simulation mode, i. Lbnl45646 ernest orlando lawrence 6 erkeley nati 0 nal laboratory local grid rehernent for multiscale geothermal reservoir simulation with tough2 julio garcia and karsten pruess. Dynamic local grid refinement dlgr is a simulation technique that can adapt the spatial grid resolution to the scale at which the physical phenomena occur without refining the grid over the entire domain. Modeling hydraulic fractures in finite difference simulators.
Flexible gridding has the potential of increasing the accuracy in numerical simulation of flow through hydrocarbon reservoirs within limitations in computing time and memory space. Flow simulation using local grid refinements to model laminated reservoirs. Development of an algorithm of dynamic gridding for. Global scaleup of reservoir model permeability with local. Development of dynamic local grid refinement in reservoir. 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. At the second stage, a local refinement of the superelement model is constructed for calculating smallscale processes with a scale of m day, which take place, for example, during various geological and technical measures aimed at increasing the oil recovery of a reservoir. Local refinement of the super element model of oil reservoir a. Still reservoir simulation is regularly used with great success, and remains one of the support pillars. Productivity simulation of hydraulically fractured wells. Simulation study of co 2 eor in tight oil reservoirs with. A model itself is either physical for example, a laboratory sandpack or. On the factors influencing the grid orientation effect in. The inserted grid may be cartesian center or radial upper left.
In order to get the desired accuracy in reservoir simulation, it is often necessary to refine the grid in certain regions, for example, the regions around wells. Accuracy with which the geological description of the reservoir is matched discretisation of the flow equations heriot watt university, reservoir simulation course grid. Local refinement of the super element model of oil. The main benefit of using this method is to overcome unexpected results as a result of the use of large grid size ding and. Modeling hydraulic fractures in finite difference simulators using amalgam local grid refinement lgr, journal of petroleum exploration and production technology, 2012, pp. Modern reservoir simulation faces increasingly complex physical. To minimize simulation time, local grid refinement. Reservoir simulation course grid given difficulty of measuring rock properties, it is common to use geostatical methods to.
A project contains one or more ensembles, each ensemble representing a scenario the engineer wishes to investigate. Simulation of petroleum reservoir performance refers to the construction and operation of a model whose behavior assumes the appearance of actual reservoir behavior. The methodology targets individual cells for refinement based on forecasted compositional fronts calculated using streamlines and the analytical convectiondispersion transport equation. Jacobs koninklijkelshell exploratie en produktie laboratorium, rijswijk, the netherlands received may 9, 1986. In basin modelling, lgr has not yet been implemented. Local grid refinement, it is a widely used expression for the process of dividing one or several grids in the reservoir model into smaller sized grids allowing enhanced grid definition, which is useful for modeling wells or hydraulic fractures and other complex reservoir structures. Turgay ertekin, has been in the forefront of reservoir simulation technologies for the last three decades and is the principal author of the spe textbook entitled basic applied reservoir simulation. Local grid refinement is a technique which aims to provide improved accuracy in subregions of a reservoir simulation study.
Journal of computational physics 77, 140165 1988 adaptive local grid refinement and multi grid in numerical reservoir simulation g. We discuss local grid refinement procedures for reservoir simulation, including local timestepping, which means the use of different time step sizes in the coarse and refined regions. Rezen provides a hierarchical data structure for managing all the simulation runs in a reservoir simulation project. Within each ensemble a number of simulation decks can be created, edited and run. Spe rss aim clees ganzer 20061204 tc clean fraunhofer scai. It can be simply considered as the process of mimicking the behavior of fluid flow in a. Box 819047, dallas, tx 75381, usa 6 department of petroleum and geosystems engineering, university of texas at austin. The course covers following advanced eclipse and petrel reservoir engineering modules. One challenge of the estimation of the recovery is to properly model complex hydraulic fracture geometries which are often assumed to be planar due to the limitation of local grid refinement. Dynamic local grid refinement can be used to overcome this problem. Flexible gridding has the potential of increasing the accuracy in numerical simulation of flow through hydrocarbon reservoirs within limitations in computing time. The skua flow simulation grid module enables geoscientists and engineers to construct 3d reservoir grids that are optimal for numerical flow simulation. Two related issues are involved in choosing a grid for reservoir simulation.
Using the dynamical local grid refinement method to be able to trace the boundary motion in reservoir simulation has been an issue. The adaptive gridding method presented here follows. Adaptive local grid refinement and multigrid in numerical. Preconditioned conjugate gradient methods for largescale. Introduction webster defines simulate as to assume the appearance of without reality. Adaptive mesh refinement and coarsening for compositional. Introduction to reservoir simulation montanuniversitat leoben. Nearwell local space and time refinement in reservoir. Adaptive local mesh refinement and multigrid solution. In reservoir simulation, the grid size is usually too large to give accurate results, especially in active regions near wells and displacement fronts. Skua flow simulation grid bringing geology to flow simulation. Applying basin modeling technology to predict highresolution fluid distribution and properties, taking into account the local high resolution of the sediment properties in fields and prospects has been a growing need for the past 10 yr. End the definition of a local grid refinement 203 6.
Lake b mobil exploration and producing technical center, p. Development of dynamic local grid refinement in reservoir simulation. Local grid refinement methods for basin modeling search and. Twoway coupling of flow and geomechanics simulations with. Sensitivity analysis of the grid refinement and case study of. Adaptive local grid refinement and multi grid in numerical reservoir simulation. Spe references csugspe 1pp shale gas modeling workflow. Using current embedded discrete fracture models edfm to predict the productivity of fractured wells has some drawbacks, such as not supporting corne. In this paper we address several practical aspects of some methods of lgr.
The merriamwebster dictionary defines simulate as assuming the appearance of without the reality. Local grid refinement lgr can be used to model near well effects in field scale simulation. A grid refinement of the whole domain is very memory and cpu time consuming for fieldscale simulations. The decision was made to numerically represent hydraulic fractures in the simulator using fine grid blocks, called local grid refinement lgr. Dynamic local grid refinement dlgr is a simulation technique that can adapt the spatial grid resolution to. Reservoir simulation ertekinabbaszadeh ips2014 v2 ma. This research was performed in the petreleclipse reservoir simulation environment. Disclaimer this report was prepared as an account of work sponsored by an agency of the united states government. This dissertation introduces a new method to create adaptive mesh refinement and coarsening in compositional reservoir simulation. These grids are true to the interpreted geology both in terms of structure and stratigraphy.
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