Study On Storage Capacity Parameter Design Of JDPG Reservoir-type Gas Storage

The gas storage is the key to solve the serious imbalance in time between the supply and consumption of natural gas,which is reliable,safe,and continuous gas supply and consumption demand.With the economic development,the demand for natural gas in the Beijing-TianjinHebei region has increased,and the existing gas storage groups can no longer meet the peakshaving needs of the Beijing-Tianjin-Hebei region.Gas storage as a supplement.Based on the JDPG reservoir data,this paper analyzes the geological characteristics of the reservoir,determines the type of the reservoir,and evaluates the sealing performance of the trap.The storage capacity parameters of the gas storage are:1.The basic data of the JDPG reservoir were sorted out,and the tightness of the reservoir traps was evaluated.The tightness of the JDPG reservoir is good,and it is suitable for the construction of gas storage.2.On the basis of investigating a large number of domestic and foreign literatures,combined with existing gas storage construction cases,multiple rounds of injection and production experiments were carried out,and the three-phase seepage capacity of oil,gas and water,effective pore volume,The fluid saturation and the changing law of oil displacement efficiency and water displacement efficiency under different flooding conditions were studied,and the reasons for the changes were studied.Combined with the existing fine reservoir description,the construction space of the gas storage was evaluated.3.Apply the existing empirical formula,carry out thin tube experiments to determine the minimum miscible pressure,and determine the upper limit pressure combined with the trap sealing pressure.4.Under the constraints of surface pipeline network requirements,working gas scale,and economic optimality,the lower limit pressure is determined by the method of oil and gas reservoir engineering.5.Based on the reservoir engineering method,six sets of injection and production schemes were designed,predicted by numerical simulation software,the relationship between the liquid production and the upper and lower limit pressures was analyzed,and the upper and lower limit pressures were optimized.6.The storage capacity was comprehensively determined by the numerical simulation method and the oil and gas reservoir engineering method.Considering the lower limit pressure and the abandonment pressure,the cushion gas was designed by the oil and gas reservoir engineering method.Considering the storage capacity and the lower limit pressure,the oil and gas reservoir engineering method was used to design the working gas volume..