摘要
针对X凝析气藏气井初期产量高、递减速度快、普遍存在地层和井底反凝析等现象,在陈元千方法的基础上完善了油气相渗曲线的归一化方法,分析了基质岩心和人工压缝岩心的相渗曲线特点。从凝析气驱油过程中油气相渗曲线变化规律出发,研究了低渗凝析气藏无因次采油指数、无因次采液指数的计算方法、变化规律以及影响因素。研究结果表明:较大的油气粘度比和较小的M值(启动压力梯度与生产压力梯度的比值)更有利于气井高含气阶段的提气携液。
For X condensate gas-reservoir,there are high initial production rate,rapid production decline rate,common retrograde condensation at borehole bottom or in the formation.On the basis of Chen Yuanqian method,we improved the nor-malization method for oil and gas relative permeability curves,and analyzed the characteristics of relative permeability curves for matrix and artificial fractured cores.According to the change rule of oil/gas relative permeability curves in the process of condensate gas flooding,it was studied that the calculation method for dimensionless oil/fluid productivity index,the change rules,and its influence factors in low permeability condensate gas reservoir.The research results showed that larger viscosity ratio of oil and gas and smaller M value,which is the ratio of start-up pressure gradient and production pressure gradient, are advantageous to improve production rate and liquid-carrying capacity of gas wells at high gas-cut stage.
出处
《复杂油气藏》
2014年第4期57-61,共5页
Complex Hydrocarbon Reservoirs
基金
十二五国家重大专项子课题<低渗低丰度储层可动用条件评价研究>(子课题编号2011ZX05015-001-04)
关键词
低渗透致密砂岩
凝析气藏
气驱油
无因次采液指数
无因次采油指数
low permeability tight sandstone
condensate gas reservoir
gas drive
dimensionless fluid productivity index
