Research Of Production Methods Of The Cavity-fractured Carbonate Reservoirs

In recent years,the research of the development of the cavity-fractured reservoir is being one of the focal points and difficult things.The most outstanding problem of fractured vuggy carbonate reservoirs is extreme heterogeneity and the various scales of fracture and vuggy fabric and multifold connection.All these made a great number of difficulties in the development of carbonate reservoirs.By now,there is no mature enough method of development of this kind of reservoir home and abroad.Many difficulties of the choice of production methods had been encountered during the development of the cavity-fractured reservoirs of the Tarim Basin.It is very necessary to research the production methods of the cavity-fractured reservoirs.The material was got based on an extensive investigation of the documents home and abroad,which are the static data of the crude oil and water,the characteristics of the cavity-fractured reservoirs,the main production methods of the cavity-fractured reservoirs.The characteristics of the cavity-fractured reservoirs were studied firstly, then the main production methods were studied by the reservoir numerical simulation. The new research results are as following:1.The cavity-fractured reservoirs home and abroad are developed by energy of nature firstly,then by water flooding,finally by gas drive,thermal production or horizontal well.Depletion type of drive,water flooding,gas-drive are the main production methods of the cavity-fractured reservoirs.2.The equivalent porosity and permeability is high in the well-developed fracture and vuggy reservoirs.3.The energy of depletion type of drive is provided by natural energy,in which the most important influence factors are controlled reserve of the individual well,rate of oil production,viscosity of crude,initial formation pressure.4.Gravity segregation and adding energy are dominant mechanism of the injecting water to replace crude oil for individual well,in which the most important influence factors are timing of water injection,permeability,injected water volume, the time of shut-in well,working system of open-in well,the perforated degree.There are optimal value in timing of water injection,injected water volume,the time of shut-in well,working system of open-in well,the perforated degree.