Development of gas-hydro-dynamic model of some site of a field with hardly-recoverable reserves
This paper presents the basic principles and results of building of constantly working geological-gas-hydrodynamic model of some site of a gas-condensate field of the Pre-Caspian depression (GCF). Powerful modern software, namely, "Tempest" hydrodynamic simulator of the new generation, produced by "ROXAR" firm, is applied for modeling the development of such a complicated object. It is based on the detailed geological-mathematical model, which combines the deterministic and stochastic approaches. To transfer from the detailed three-dimensional geological model of a site of a gas-condensate field to a three-dimensional dynamic model used some special procedure of UPSCALING averaging was used. It was implemented in the IRAP RMS software package. This procedure allows maximum-accurate reflection of the structure and heterogeneity of productive strata's filtration-volumetric properties of as accurately as possible in the gas-hydrodynamic model. UPSCALING envisages use of the method of permeability full tensor based on the numerical solution of the filtration equation. The technology of adaptation by the history of development of three-dimensional gas-hydrodynamic model of a gas-condensate field is tested. Two variants of the dynamic model in terms of assigning PVT-properties of reservoir fluids, such as compositional model and "Black oil" model are discussed. Analysis of the sensitivity of the computational results to the changes of the initial data witnessed the fact that the adaptation of the model by reservoir pressure can be made by permeability adjustment, by inter-block connectivity and by ratio of the collector deformation.