摘要
开展了井下裂解就地改质稠油,提高稠油油藏蒸汽吞吐采收率的室内模拟实验和矿场应用试验。研究表明,油藏矿物可催化稠油水热裂解反应,其中黏土矿物的催化效果优于其他矿物,可使稠油黏度降低30%以上,黏土矿物含量越高,越有利于水热裂解反应;注入催化剂硫酸镍和供氢剂四氢萘溶液段塞后,蒸汽吞吐最终采收率大幅度提高,比单纯蒸汽吞吐提高8.8%,产出油降黏率增加51.7%,饱和烃、芳香烃含量分别增加38.0mg/g和26.3 mg/g,胶质、沥青质含量分别降低41.9mg/g和41.1mg/g.矿场试验结果表明,井下裂解就地改质稠油技术可延长蒸汽吞吐周期生产时间、提高日产油量、提高油汽比和回采水率,较大程度地改善蒸汽吞吐开发效果。
Aiming at low final oil recovery of steam stimulation for recovering heavy oil,the laboratory experiments and field tests of downhole aquathermolysis for in-situ upgrading heavy oil technology were conducted to study how to improve the situation.The experimental results show that the reservoir minerals have catalytic effects on aquathermolysis of heavy oil,among which the catalytic effect of clay minerals on oil viscosity reduction is better than that of rock minerals,reaching more than 30%.The higher the content of clay minerals is in the reservoir,the more oil reduction can be obtained in aquathermolysis.After nickel sulfate and tetralin are injected as a plug before steam,the final oil recovery is 8.8% more than that of pure steam stimulation,the oil viscosity reduction rate can be increased by 51.7%,the contents of saturates and aromatics increased by 38.0 mg/g and 26.3 mg/g and the contents of resins and asphaltenes reduced by 41.9 mg/g and 41.1 mg/g,respectively.The field test results demonstrate that downhole aquathermolysis technology for in-situ upgrading heavy oil can prolong production period of steam stimulation,increase daily oil production rate,control total water-cut,and increase oil/steam ratio and water recovery ratio.In the end,the development effect of steam stimulation will be largely improved.
出处
《新疆石油地质》
CAS
CSCD
北大核心
2011年第5期508-511,共4页
Xinjiang Petroleum Geology
基金
国家科技重大专项(2008ZX05012-001)
关键词
辽河油田
稠油
蒸汽吞吐
井下裂解
提高采收率
Liaohe oilfield
heavy oil
steam stimulation
downhole aquathermolysis
enhanced oil recovery
作者简介
张弦（1983一），女，贵州毕节人，博士，碉油开采，（Tel）13936894370（E—mail）z}langxianer@163.com
