Dynamic Reserve New Calculation Model for Fracture-Vuggy Reservoirs Considering the Effect of Dissolved Gas Precipitation
The internal spatial structure of fractured-karst reservoirs is complex,and the fluid distribution forms are diverse.The existence of water bodies and dissolved gases in the fracture-karst reservoir collective has a significant impact on dynamic reserves calculation.The material balance method of reservoir engineering does not consider the internal structure of the reservoir and the miscible state of oil and gas in the production process,and only calculates the reserves according to the change of reservoir pressure and the cumulative injection and production.Based on the conventional mass balance method of reservoir engineering,this paper introduces the parameters to characterize the energy of the water body,considers the influence of dissolved gas on reserves in reservoir development,corrects the comprehensive volume compressibility coefficient,and establishes a new model for dynamic reserve calculation,which makes up for the shortcomings of the existing calculation methods that do not fully consider the factors of comprehensive volume compressibility coefficient.The analysis of the example wells shows that compared with other dynamic reserve calculation models,the reservoir reserves gradually decrease with the increase of water energy.Under the same water energy,the dissolved gas is precipitated,the volume coefficient of crude oil becomes larger,and the reservoir reserves also decrease.The settlement results show that the model can more accurately characterize the actual situation of fractured-vuggy reservoir development,and provides a new method for calculating the reserves of this type of reservoir.
material balance methodfracture-vuggy reservoirsdynamic reserve calculationdissolved gas
国家科技期刊平台
NSTL
万方数据
