The Rule Of Gas Channeling And Research On The Flow Mechanism In Fractured-Vuggy Carbonate Reservoir

Reserves scale of fractured-vuggy carbonate reservoir is large,and it has different reservoir characteristics from the conventional sandstone reservoir.Reservoir boy is mainly made of fracture,vuggy and hole.Vuggy is well developed.Thus the flow rule of fractured-vuggy carbonate reservoir is special.Gas flooding can change phase state of oil and is a kind of important method to develop such reservoir.At the same time,as a result of the carbonate reservoir is extremely heterogeneity,phenomenon of injection medium channeling is obvious,and development efficiency in such reservoir is low.Researching flow rule in such reservoir and rule of gas channeling is fundamental for high-yield and high-efficient in fractured-vuggy carbonate reservoir.Designing visual signal crack and fracture-vuggy combination model to simulate fluid flow in fractured-vuggy carbonate reservoir and the rule of gas channeling and fluid flowing,also set up the prediction plate of fluid flow region during gas displacing oil in single fracture which was built based on different parameters.Building two-dimension typical fracture-vuggy model according to the geology and reservoir characteristics of fractured-vuggy carbonate reservoir to research flow and gas channeling rule in different factors and simulate production performance of typical well;Discussing the characteristics of gas flow in the three dimensional complex reservoir model with the previous study.Research shows that,gas displacement form in cracks is influenced by the crack aperture and displacement velocity;the characteristics of gas channeling and flow rule in fractured-vuggy reservoir are influenced by cave filling,bottom water energy and oil viscosity as well as the combination of fracture and vuggy;the characteristic of gas channeling is mainly influenced by the structure and connection of fracture and vuggy;composite effect of bottom water and gas changes flow channels of injected gas as well as the sweep volume of gas,also makes the distribution of residual oil complex.Such research is important to guide method optimization and project designing in improving the recovery of fracture-vuggy reservoir.