薄层稠油油藏过热蒸汽吞吐技术优势解析

在过热蒸汽开发稠油油藏提高采收率机理分析基础上，利用数值模拟技术对1-3m、3-5m和5m以上薄层稠油油藏实施过热蒸汽吞吐的开发效果进行了对比和分析。通过对比普通湿蒸汽、高温湿蒸汽和过热蒸汽的增油能力、节约蒸汽效果及油藏特征，分析了稠油油藏过热蒸汽吞吐的技术优势。研究结果表明，过热蒸汽吞吐的增油能力明显高于普通湿饱和蒸汽吞吐和高温湿蒸汽，但当过热度超过20℃后，增油幅度变缓；相同产油量时，过热蒸汽要比湿饱和蒸汽节约大量蒸汽。这是因为过热蒸汽携热量大，比容高，可以有效萃取稠油中的轻质组分，有效扩大波及体积，增加洗油效率。

The Analysis on Advantages of Superheated Steam Stimulation Technology in Thin Heavy Oil Reservoir

Base on the mechanisms of superheated steam enhancing oil recovery in heavy oil reservoirs,numerical simulation was employed to analyze development effectiveness of superheated steam stimulation in thin heavy oil reservoirs with different net pay,such as 1—3 m,3—5 m and over 5 m.By contrasting of incremental oil effect,steam-saving volume,reservoir features among conventional saturated steam,hot saturated steam and superheated steam,the technological advantages of superheated steam stimulation was analyzed to develop heavy oil reservoirs.The results show that incremental oil effect of superheated steam is much higher than conventional saturated steam and hot saturated steam,but it gradually increases slower when degree of superheat was over 20 ℃.When the same volume of heavy oil was produced by the three kinds of steams,superheated steam could save amount of steam.This is because that superheated steam has higher heat quantity and larger specific volume.Superheated steam can effectively extract light component in heavy oil,increase swept volume and enhance washing oil efficiency in heavy oil reservoirs.