Study On Flow Potential Control And Development Technology Policy Of Fractured-vuggy Reservoirs

Fractured-vuggy carbonate reservoir has special reservoir structure and complex hydrodynamic system.The treatment of inefficient well group,water control and oil increase are the key and difficult points of reservoir development adjustment.Production practice shows that the flow potential adjustment method based on hydrodynamics is one of the most effective methods for injection-production well group control in fracturedvuggy reservoirs.However,the fluid potential theory of fractured-vuggy reservoirs is still in the development stage,and there are problems such as imperfect manifestations and lack of quantitative characterization,which cannot accurately guide the production and development adjustment of reservoir.Therefore,this paper establishes a fluid potential characterization and calculation method suitable for fractured-vuggy carbonate reservoir by combing the main control factors of fluid potential in hydrodynamic system and combining with dynamic and static comprehensive analysis technology.The fluid potential control method is combed,and the targeted fluid potential adjustment countermeasures for different fracture-cavity units are determined.Based on the results of flow potential adjustment analysis,the optimal technical policies for flow potential regulation of typical fracture-cavity units in different karst models are quantitatively determined by reservoir numerical simulation method.The study shows that potential energy and pressure energy are the key factors affecting fluid potential.The key to calculate pressure energy is to convert bottom hole pressure of each production well,and Hagedorn & Brown model is introduced to convert bottom hole pressure to determine pressure energy.At present,the widely used flow potential control methods mainly include liquid extraction and drainage,liquid control and cone suppression,water diversion and oil displacement.The determination of flow potential adjustment countermeasures needs to be combined with the results of production dynamic analysis,development potential analysis and connectivity evaluation.The flow potential adjustment countermeasures of 158 single wells are analyzed,including 31 liquid control and cone suppression,32 drainage and drainage,34 water diversion and oil displacement,and 25 analysis wells.The flow potential control policy definition chart of each fracture-cavity unit is proposed to provide the basis for the efficient development of the same type of reservoirs.