【摘 要】
：
渭北油田WB2井区采用超前注水直注直采开发方式,开发效果不理想。通过渭北长3超低渗储层岩心物模室内实验,结合核磁共振数据,研究了水驱、CO_2驱、注水转注气3种方式的微观驱
【机 构】
：
中国石化西南油气分公司勘探开发研究院,中国石化华北油气分公司勘探开发研究院
【基金项目】
：
国家科技重大专项“低丰度致密低渗油气藏开发关键技术”（2016ZX05048）
论文部分内容阅读
渭北油田WB2井区采用超前注水直注直采开发方式,开发效果不理想。通过渭北长3超低渗储层岩心物模室内实验,结合核磁共振数据,研究了水驱、CO_2驱、注水转注气3种方式的微观驱油机理。实验结果表明,渭北长3超低渗储层水驱驱油效率最低（37%）,CO_2驱油效率更高（54.3%）;水驱转气驱驱油效率最高（约55.7%）。通过核磁共振测量不同驱替方式后岩心的剩余油分布发现,直接水驱主要动用中、小孔隙中的原油,直接气驱更大程度动用的是中、大孔隙中的原油,而水驱转气驱能扩大波及范围,进一步动用大中小孔隙中的原油;注水
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