【摘 要】
：
采用塔河油田缝洞型油藏稀油和常规稠油两种代表性油样,通过开展向前多次接触相平衡实验模拟蒸发气驱过程、向后多次接触相平衡实验模拟凝析气驱过程,研究了氮气与塔河油田原
【机 构】
：
中国石油化工股份有限公司石油勘探开发研究院 北京 100083;中国石油化工集团公司海相油气藏开发重点实验室 北京 100083;中国石油大学(北京)安全与海洋工程学院 北京 102249
论文部分内容阅读
采用塔河油田缝洞型油藏稀油和常规稠油两种代表性油样,通过开展向前多次接触相平衡实验模拟蒸发气驱过程、向后多次接触相平衡实验模拟凝析气驱过程,研究了氮气与塔河油田原油在高温高压条件下的相态变化,明确了氮气与地层原油充分接触混合后地层流体的气液组分变化规律,提出了抽提指数的计算表达式,定量评价了氮气在高温高压条件下对原油轻组分的抽提效果,深化了注氮气提高采收率作用机理的认识.研究结果表明,塔河油田油藏条件(压力＞65 MPa、温度＞415 K)下,原油中轻质组分(C1—C5)经过5次接触后的流失率高达94％～100％,氮气对原油有较强的抽提作用;向前接触实验中,随接触次数增加,抽提作用越来越强,抽提指数越来越大,同次接触氮气对稀油的抽提指数是稠油的5倍以上;注入气中加入20％的CO2后对原油中轻质组分的抽提效果增强不显著,抽提指数仅小幅变化.两种气体与塔河油田稀油在多次向前接触后展现出了近混相的趋势;向后接触实验表明,首次接触抽提作用最大,抽提指数随着接触次数的增加逐渐减小至0,较之向前接触明显偏小.
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