Application of LET and LETx correlations to multiphase flow parameters of reservoir
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LET is three parameter analytical correlation with definite endpoint water relative permeability. LETx is the extended version of LET correlation where injection or influx relative permeability is extended to maximum saturation i.e. SWU = 1. The most significant difference between LET, LETx correlations compared to most industry used correlations is the ability to model relative permeability through entire range of water saturation while being easy to communicate. This master thesis is direct continuation of semester project dedicated for application of LET and LETx correlations to SCAL input of Eclipse simulation models. Background chapter of thesis explains different concepts of multiphase flow, multiphase flow correlations and concepts used in upscaling. Commercial simulator Eclipse and prepost processor Petrel were utilized for application LET and LETx to reservoir modeling. The core purpose simulation chapter is to test the use of LET and LETx correlations on different reservoir engineering tasks. Two different directions were selected to test the use LET and LETx on different reservoir engineering tasks. First direction discusses the application of LET and LETx to obtain pseudo-relative permeabilities for two-phase flow up-scaling issue of different geological systems. Qualitative and quantitative analysis showed close to perfect results for LET and LETx correlations. Up-scaling performance of LETx correlation was compared to Corey for comparison purposes on thiefzone model. LETx correlation performed much more accurate multiphase upscaling of severe thiefzone model than Corey correlation. Second direction discusses the application of LET and LETx correlations for generating SCALinput of heterogeneous small field model with increasing complexity on endpoint scaling and relative permeability inputs. The core purpose of second direction is to determine the degree of complexity needed for creating accurate model of fluid displacement with non-uniform flooding fronts. Possible workflow of using LET and LETx empirical parameters is shown. These suggestions and proposals of different workflows were linked to master chart of impact scalers. Outcomes of qualitative and quantitative analysis were discussed in conclusions section of master thesis. Conclusion section also outlines suggestions how flexibility of LET and LETx correlations can enhance quality of multiphase flow history matching.