Abstract:

In order to better recognize the special flow mechanism of vuggy fractured carbonate rock reservoir，in this paper，a holo-diameter core model is designed and made based on the actual conditions of a certain vuggy fractured carbonate rock reservoir.The laboratory samples from this reservoir，actual oil sample and similar formation water are used in the simulation experiments of water displacing oil mechanism.These experiments include horizon，30o and 60o angles water displacing oil simulation experiments.The result shows that recovery ratio，water content and breakthrough oil stage of vuggy fractured carbonate are in close connection with vuggy fractured structure.Afterwards，the experimental data are analyzed carefully and used in matching J.Cruz-Hernandez′s vuggy fractured carbonate water/oil two-phase flow mathematical model based on convective diffuse filtration theory.And then，such affecting factors of this model are discussed as the fraction of the porous space，the coefficient of transfer of fluids and flow velocity.At last，the authors propose that the factors of gravity，flow velocity and coordinate number of vugs should be take into consideration in the development of the model.

Key words: vuggy fractured carbonate rock, water displacing oil mechanism, simulation experiment, water/oil two phases flow, reservoir simulation