RESERVOIR SIMULATION MODELING IN CFD ENVIRONMENT
Rodrigo Dias1; Angela Nieckele1; Sylvio Dermeval2; Paulo Dore2; Thiago Judson2; Antonio Samel3; Jovani Favero3
1 PUC-RJ; 2 PETROBRAS; 3 Wikki Brasil
doi:10.20906/CPS/COB-2015-1846
Resumo
One of the challenges encountered in the petroleum industry is to determine accurately the production of a well. The accurate computation of well performance is very important for reservoir management and optimization. Comercial standard large-scale reservoir simulators, however, typically do not consider important near-well physics such as detailed interaction between the local pressure gradient, reservoir heterogeneity, well completion components and details around the wellbore. These effects occur on scales that are very small compared to typical simulation grid blocks. This paper presents the mathematical model implementation of single-phase compressible flow in petroleum reservoir. This model is fairly common and well known in commercial software for reservoir simulations, such as IMEX or Eclipse. Although extremely widespread in the petroleum industry, the mathematical model of the hydraulic diffusivity is not found in computational fluid dynamic (CFD) softwares, such as ANSYS Fluent and OpenFoam. The versatility of a CFD software can be used with enormous potential for reservoir simulation. Discretization of the exact wellbore geometry, perforation holes and hydraulic fracture are examples of near well details that can be accounted in a simple way into a CFD software. This paper presents results of mathematical model implementation of hydraulic diffusivity equation, which was implemented in the open source code OpenFoam and in ANSYS FLUENT through user-defined-functions macrosand. The solutions obtained for a few cases with the present mehodology, employing both CFD codes, were compared with the predictions of the well stabished comercial reservoir simulation software CMG IMEX, presenting excellent agreement. It was also shown that superior and more detailed solution can be achieved.
Palavras-chave: Reservoir Simulation; CFD; Near Well; OpenFoam; FLUENT