稠油油藏注CO提高采收率影响因素研究

CO EOR factors in heavy oil reservoirs

孙焕泉 王海涛 吴光焕 王一平

SUN Huanquan WANG Haitao WU Guanghuan WANG Yiping

中国石油化工股份有限公司, 北京 100728 中国石化 石油勘探开发研究院, 北京 100083 中国石化 胜利油田分公司, 山东 东营 257015

SINOPEC, Beijing 100728, China Petroleum Exploration&Production Research Institute(PEPRIS), SINOPEC, Beijing 100083, China Shengli Oilfield, SINOPEC, Dongying, Shandong 257015, China

与稀油注CO2提高采收率机理不同，CO2与稠油无法达到混相，因此影响其开发效果的主要因素差别很大，特别是在热化学复合采油过程中，注入的CO2主要发挥隔热、降黏、增能的作用。为了进一步研究不同因素对稠油油藏注CO2驱替效果的影响，在稠油样品物性分析的基础上，利用正交实验方法研究了原油黏度、温度、压力和渗透率对稠油油藏注CO2提高采收率的影响。温度对采收率影响最大，其他因素由大到小依次为：渗透率、压力、油样类型。根据实验结论及认识，综合考虑地层温度、油藏渗透率等因素，在胜利油田开展了稠油油藏注CO2吞吐提高采收率矿场试验。从矿场实际生产结果来看，油藏温度增加以及油藏渗透率提高，都有利于注CO2吞吐开发，都能够有效提高油井产量。

Different from the mechanism of improving light oil recovery by CO2 injection, heavy oil does not mix with CO2, so the main factors affecting its development are very different. Especially in the process of thermochemical composite oil recovery, the injected CO2 mainly plays a role in insulating heat, reducing viscosity and increasing energy. The properties of heavy oil were determined in this study in order to systematically investigate the effects of different factors influencing CO2 displacement. The effect of heavy oil viscosity, temperature, pressure and permeability on recovery were investigated using the orthogonal experimental method. Temperature was the most significant factor, followed by permeability, pressure and heavy oil viscosity. According to the experimental results and considering factors such as reservoir temperature and permeability, the field tests of CO2 huff and puff in the Shengli Oilfield of SINOPEC were conducted. Production results show that increasing reservoir temperature and permeability is beneficial for CO2 EOR and can improve oil production.

https://doi.org/10.11781/sysydz2020061009