- Home
- Conferences
- Conference Proceedings
- Conferences
ECMOR XVII
- Conference date: September 14-17, 2020
- Location: Online Event
- Published: 14 September 2020
141 - 145 of 145 results
-
-
Geology Realism Control in Automated History Matching
Authors I. Matveev, G. Shishaev, G. Eremyan, D. Konoshonkin, V. Demyanov and S. KaygorodovSummaryThis paper proposes the method of an automatic history matching (HM) with the ability to preserve geological realism and an example of its application in one of the fields in Western Siberia. The method assumes takes into account all identified uncertainties at the early stages of geological model construction and their synchronized variation within realistic limits during HM.
There are interrelations between petrophysical and geological uncertainties, which significantly effect on the reservoir dynamics. Hence, changes in one of the parameters during HM should influence the synchronous change of the others in order to preserve the geological consistency of the simulation model within the given geological concept. For example, changes in parameters for porosity calculations leads to changes in parameters for permeability calculations, other model characteristics that related to permeability and so on.
Schematically the process of calculating one iteration of petrophysical parameters on the example of dependency of porosity and the SP-log can be described in the following way. After identifying the uncertainty limits based on hard data, the regression line is selected. Natural noise is added by the triangular distribution. As the result, the porosity log is built with all the values within realistic limits. However, there is not single probable dependence on the SP. Dependency type is determined by the changing values of the controlling variables (boundary points of the selected regression line) for each of the identified dependencies in the process of automated HM. Iterative algorithm «evolution strategy» is used for automatic HM. During HM objective function based on mismatch of calculated and historical data for 50 well of sector model of real field is minimized.
The distinctive feature of proposed method is the rejection of single deterministic relationships between petrophysical and geological parameters in favor of variations of these parameters within identified uncertainty range. This method allows speeding up HM and providing control of geological realism of simulation models. As a result, confidence in forecasting based on a set of adapted and geologically realistic models is increased.
-
-
-
Projection-based Embedded Discrete Fracture Model (pEDFM) on Corner-point Grid Geometry for Subsurface Flow and Geothermal Modeling
Authors M. HosseiniMehr, J.P. Piguave Tomala, C. Vuik and H. HajibeygiSummaryWe develop projection-based embedded discrete fracture model (pEDFM) on corner-point grids (CPG) for fluid flow and heat transfer in subsurface geological formations. The coupling between the flow and heat transfer is fully-implicit, to allow for stable simulations, specially in presence of highly contrasting fractures. We define independent CPG-based mesh for matrix rock and all 3D fractures, which allows for capturing geologically complex geometries. The connectivities between the non-neighbouring cells are described such that a consistent discrete representation of the embedded fractures are developed within the CPG geometry. Numerical rests are developed first to verify the CPG grid implementation compared with the Cartesian structured ones, and then to illustrate the applicability of the pEDFM for field-scale geologically complex reservoirs.
-
-
-
Multi-scale Nonlinear Modeling of Subsurface Energy Storage: Cyclic Loading with Inelastic Creep Deformation
Authors K. Ramesh Kumar and H. HajibeygiSummarySubsurface geological formations provide giant capacities for large-scale (TWh) storage of renewable energy, once this energy (e.g. from solar and wind power plants) is converted to green gas (e.g. hydrogen and green methane), pressurised or hot fluids. The key aspects of successful development of this technology include estimation of safety and storage capacity for a given formation. Formations are often highly heterogeneous, with complex (nonlinear) transport and material physics. In this work, we present a computational framework for cyclic loading of rock specimens to estimate deformation under nonlinear creep behaviour. Classical creep and relaxation creep are the two methodologies which are modeled to analyse the variation of total strain in the specimen over time. Algebraic multi-scale finite element formulation is then implemented to provide a field-scale relevant computational framework for these nonlinear time-dependent systems. This study indicates that the nonlinear deformation is quite an important aspect of cyclic energy storage in the subsurface formation, and that the proposed multi-scale simulation can provide a field-scale simulation approach to consider this important physics for safety and reliability of the storage projects.
-
-
-
Multiscale Extended Finite Element Method for Deformable Fractured Media
Authors F. Xu, H. Hajibeygi and B. SluysSummaryWe present the first multiscale extended finite element (MS-XFEM) method. MS-XFEM develops local multiscale basis functions which allow for constructing accurate coarse-scale systems. These basis functions are computed locally using XFEM. Both enrichment functions along the fracture nodes and tips are considered in the basis function calculation. These functions are then used to construct and solve the coarse-scale system. Note that no enrichment exists on the coarse level. This makes our MS-XFEM procedure computationally efficient, yet accurate, for highly-fractured real-field applications. For several test cases, the MS-XFEM performance is investigated compared with the classical XFEM method. MS-XFEM casts a promising approach for real-field analyses of mechanical deformation influenced by the reservoir pore-pressure change.
-
-
-
An Investigation into the Upscaling of Mineral Dissolution from the Pore to the Core Scale
Authors A.N. Faris, J. Maes and H.P. MenkeSummaryStudying the behavior of mineral dissolution has practical uses in Carbon Capture and Storage (CCS) and Improved Oil Recovery (IOR), and several numerical models are striving to simulate the process accurately. In this paper, we investigate the core-scale numerical model presented by Golfier et al. (J. Fluid Mecha., 2002), which uses the Darcy-Brinkman-Stokes (DBS) flow formulation. This model uses a simplified Kozeny-Carmen formulation and a simplified linear formulation to describe the evolution of permeability and mass exchange coefficient as a function of porosity at the core-scale, respectively. This assumption is equivalent to neglecting the impact of pore-scale non-uniform dissolution on the prediction of the dissolution processes overall behavior. However, recent pore-scale dissolution studies have observed many different dissolution regimes, which calls into question the accuracy of the assumptions in Golfier et al. (2002) ’s model. To investigate the legitimacy of this assumption, we first used our inhouse pore-scale numerical simulator (GeoChemFoam) to observe the dissolution in the uniform and dominant wormhole regimes at the pore-scale, and then developed representative permeability (K) and mass exchange coefficient (α) relations derived from the pore-scale models and applied them to the corescale model. We observed a direct impact on the model’s total permeability, the time to breakthrough and the wormhole’s total porosity volume, which indicates that Golfier et al (2002) ’s uniform dissolution assumption cannot be directly used for predicting the evolution of dissolution under a wide range of flow and transport conditions without investigating the relations between the pore-scale and the core-scale.
-