化学驱微观剩余油启动顺序及驱油效果实验研究

Experimental Study on the Startup Sequence and Oil Displacement Efficiency of Micro Remaining Oil by Chemical Flooding

陈晶 湛祥惠

CHEN Jing ZHAN Xianghui

中国石油化工股份有限公司上海海洋油气分公司, 上海 200120; 中国石油化工股份有限公司上海海洋油气分公司勘探开发研究院, 上海 200120

SINOPEC Shanghai Offshore Oil & Gas Company, Shanghai 200120, China; Institute of Exploration and Development, SINOPEC Shanghai Offshore Oil & Gas Company, Shanghai 200120, China

化学驱是进一步提高水驱油藏采收率的主要技术手段之一。目前的化学驱油机理研究仅能反映不同驱剂对不同类型剩余油的驱替过程，没有将不同类型剩余油作为一个整体考虑，分析启动不同类型剩余油的顺序和难易程度，更没有考虑孔隙结构的微观非均质性对驱油效果的影响。此文以光刻微观物理模型为研究手段，深入研究了不同类型驱剂启动剩余油的顺序和难易程度。研究结果表明：不同类型驱剂启动不同类型剩余油的顺序和难易程度不同，以聚/表二元体系最易启动剩余油，且基本可以同时启动不同类型剩余油；孔隙结构微观非均质性对驱油效果的影响表现为：相同渗透性的岩心，孔喉比越大驱替效果越差，当孔喉比相同时，配位数越大驱替效果越好。

Chemical flooding is one of the main technical means to further improve the recovery rate of water flooding. The present study on the mechanisms of chemical flooding, however, can only reveal the displacement process of different types of remaining oil by different flooding agents, not taking the different types of remaining oil as a whole and analyzing the startup sequence and complexity of different types of remaining oil, no more taking into account the effect of heterogeneity in the microscopic pore structure on the oil displacement efficiency. In this article, the author studies the startup sequence and complexity of remaining oil by different types of flooding agents by the means of photolithography micro physical model. The results indicate the startup sequence and complexity of remaining oil by different types of flooding agents are different. The polymer/surfactant binary system is the most active and can start up almost all types of remaining oil at the same time. As for the effect of heterogeneity in the microscopic pore structure on the oil displacement efficiency, in the case of the cores with the same permeability, the bigger the pore-throat, the poorer oil displacement efficiency, in the case of cores with the same pore-throat ratio, the bigger the coordination number, the better oil displacement efficiency.

https://doi.org/10.3969/j.issn.1008-2336.2018.02.046