Coordinated Development Of Three-dimensional Injection-production In Carbonate Reservoirsdesign Optimization Studies

Carbonate hydrocarbon resources account for about 70% of the world’s hydrocarbon resources,and the proven recoverable reserves account for about 50% of the world’s hydrocarbon resources,indicating the importance of carbonate hydrocarbon resources in the world’s hydrocarbon resources [1].At present,water drive and gas drive are still the main means in the development process of carbonate reservoir,but pure water drive or gas drive will have the problem of falloff making the overall reservoir utilization reduced,and gas-water alternate technology is a combination of water drive and gas drive technology,which not only plays the advantage of gas drive to improve the microscopic oil drive efficiency of the reservoir,but also uses the sealing effect of water on gas to improve the overall wave volume,so as to improve the overall reservoir recovery.However,the coexistence of oil,gas and water in the alternating gas-water process is still unclear,and the influencing factors of the alternating gas-water development process also need to be further studied.In this paper,firstly,we conducted oil-gas and oil-water relative permeability experiments on different types of fractured cores,combined with Azizi’s modified StoneⅠ model to study the percolation law of oil-gas-water three phases,and then conducted alternate gas-water drive experiments on long cores to compare and analyze the effects of different gas injection rates,gas-water section plug sizes and gas-water ratios on the gas and water injection capacity in the process of water injection;then we established a fractured carbonate Then,we established a mechanistic model for fractured carbonate reservoirs,and pointed out that the influence of different factors on the development process of gas-water alternation is: gas-water ratio > gas injection rate > matrix to permeability ratio > gas section plug size > fracture density.It is concluded that the inverse five-point well network can meet the overall development requirements,the gas and water injection levels have no significant influence on the development process,and the best development effect is achieved at the bottom when the top gas injection is determined;this study provides guidance for the alternate gas-water extraction in fractured carbonate reservoirs.