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三元复合驱技术能够显著提高石油的采收率,但在生产过程中,三元复合注入液易与储层岩心反应并结垢,造成井下堵塞,采收率降低。因此,研究了三元复合驱液在储层中的溶、运、堵规律。采用X射线衍射(XRD)、傅里叶转换红外光谱(FT-IR)、偏光显微镜(PM)、环境扫描电镜(ESEM)及X射线能谱仪(EDS)测试手段,分析了大庆油田储层岩心与三元复合驱液作用的反应过程,并通过反应动力学计算得到了相应的Si、Al溶出动力学方程。结果显示,南五区、杏树岗、喇嘛甸岩心碱溶50天后,分别生成钠长石、黝方石、铵长石,Si溶出量约为Al的3~4倍,Al的动力学方程为幂函数形式。建议将强碱物质NaOH改为钾或钙性碱物质。
ASP flooding technology can significantly improve oil recovery, but in the production process, ASP flooding easily react with the reservoir core and scale, resulting in underground plugging, oil recovery decreased. Therefore, the law of dissolution, transportation and plugging of ASP flooding in reservoir was studied. The structure of Daqing oilfield reservoir was analyzed by XRD, FT-IR, PM, ESEM and EDS. The reaction process between core and ternary complex flooding was studied. The corresponding kinetics equation of Si and Al dissolution was obtained by reaction kinetics. The results showed that the alkali dissolution rate of Alkali-feldspar, diabase, and ammonium feldspar was respectively 50% after alkaline solution in the cores of Nanwu District, Xingshugang and Lamaian for three days. The dissolution rate of Si was about 3 ~ 4 times that of Al. The kinetics equation of Al Power function form. It is recommended to change the alkali material NaOH to potassium or calcium base material.