影响砂岩底水气藏开发动态的因素研究

以永21断块为例,利用数值模拟方法分析了采气速度、垂直/水平渗透率比(kv/kh)、底水能量、井距、射开程度等参数对砂岩底水气藏开采效果的影响,同时对隔层大小及位置对底水上升速度的影响进行了精细模拟研究。研究表明:在选择合理射开程度、井距、采气速度的基础上,利用隔层对延缓出水的作用,应该立足于均衡开采,使底水以平托方式推进,才能获得最佳的开发效果。研究结果为改善气藏开采动态提供了理论依据。

Study on Factors Influencing the Performance of Sandstone Gas Reservoir with Bottom-water

Utilizing numerical simulation method in fault block Yong 21,influences of some parameters,such as recovery rate,ratio of vertical/horizontal permeability(k_v/k_h),size of hottom-water,well space and perforation proportion etc.,on production results of bottom-water drive sandstone gas reservoir are analyzed.Influences of length and location of shale barrier on ascending velocity of bottom-water are also elaborately simulated.It proves that based upon rational recovery rate,well space and perforation proportion,as well as taking advantage of shale barrier for putting off water coning,balanced production should be a foothold.Thus can make bottom-water advance in equilibrium form,and optimal production results can be gotten.The conclusions can provide theoretical foundation for improving production performance.