双水平井多源、多元介质辅助SAGD驱注采参数优化

Optimization of SAGD Flooding Parameters Assisted by Multiple Sources and Multiple Media in Dual Horizontal Wells

本文结合现场实际区块数据,采用正交设计试验和控制变量法分析不同注采参数对双水平井SAGD驱采收率的影响,得到注入介质、注入速度、注入质量分数和注入温度对SAGD驱采收率的影响较大,采注比影响较小的结果。在此基础上,通过油藏数值模拟技术从多源、多元角度优选出该区块注入介质为柴油,注入速度400 m3·d-1、注入质量分数25%、注入温度280℃和采注比1.4,并对优化后的注采参数进行了模拟预测。结果表明:目标区块累计产油量增加5601.3t,采出程度提高13.7%,含水率平均降低8%~10%,提高采收率效果明显,研究成果对多源、多元辅助SAGD驱开发进一步提高采收率具有理论指导意义。

Combined with the actual block data in the field,the designed orthogonal test and control variable method were used to analyze the influence of different injection parameters on SAGD flooding recovery rate of dual horizontal wells.The results showed that injection medium,injection speed,injection concentration and injection temperature had greater influence on SAGD flooding recovery rate,while the effect of injection ratio was less.On this basis,based on the numerical reservoir simulation technology,suitable flooding parameters were determined as follows:the injection medium the diesel,the injection rate 400 m3·d-1,the injection mass fraction 25%,the injection temperature 280℃,and the production-injection ratio 1.4.And under optimized injection-production parameters,the production condition was predicted.The results showed that the cumulative oil production of the target block increased by 5601.3 t,the recovery degree increased by 13.7%,the moisture content reduced by 8%~10%on average,improving oil recovery effect was obvious.The research on multi-source and multi-medium assisted SAGD development has theoretical guidance meaning to further improve oil recovery.