高3断块烟道气蒸汽混注驱替实验研究

Research on mixed flooding of flue gas with steam in cores for Block Gao-3 oil field

高 3断块位于辽河盆地西部凹陷北端 ,根据高 3断块的油藏条件 ,通过室内驱替实验研究了烟道气蒸汽混注条件下的驱油效率 ,并通过理论计算和原油模拟蒸馏实验对混注时的驱替机理进行了分析。结果表明 ,混注条件下蒸汽组分的分压降低 ,井底蒸汽干度相应提高 ,因此在注入相同的蒸汽质量当量下 ,热流体的波及范围增大 ;混注时原油蒸汽蒸馏效应得到强化 ,原油的初馏点温度降低了 2 2℃ ,注汽温度为 2 2 0℃下原油可蒸馏体积增加值由驱替初期的 5 %提高到 10 %。烟道气蒸汽混注驱替实验结果表明 ,低注汽温度范围 (<2 2 0℃ )内 ,气汽混注比例增加 ,驱替效率升高 ,高注汽温度范围 (≥ 2 2 0℃ )内 ,气汽混注比例增加 ,驱替效率增值缓慢。对于高 3断块 ,适宜的混注气汽比例为 0 .5∶1,比纯蒸汽驱原油采收率提高 3 %。

Steam-flooding experiment with flue gas as additives has been performed for Bl oc k Gao-3 oil field, and theoretical study and simulated distillation test have b een made also. It has been shown that steam partial pressure will decrease and s team quality increase in the gas mixture, so the sweeping volume will increase f or same cold water equivalent. Steam distillation effect has been enhanced, init ial distillation temperature decreases 22℃, and available distillation volume i ncreases from 5% to 10%. It has been shown that recovery factor will increase wi th the gas-steam ratio, and the tendency become mild after steam temperature in creasing. Favorable gas-steam ratio is 0.5∶1, if flue gas is mixed with steam in the experiment, and additional 3% recovery can be reached for Block Gao-3 oi l field.