高凝油藏注CO2开采方式优选室内实验研究  

Experimental study on optimized CO_2 injection pattern for high pour-point oil reservoir

作　　者：张新征[1] 李薇[2] 郭睿[2] 李香玲[2] 

机构地区：[1]中国石油大学石油工程学院,北京102249 [2]中国石油勘探开发研究院,北京100083

出　　处：《大庆石油地质与开发》2008年第3期110-112,120,共4页Petroleum Geology & Oilfield Development in Daqing

摘　　要：高凝油具有高凝固点和高含蜡的特点,若开发方式不当,极易发生储层伤害,降低采收率。为针对研究区块确定合理的开采方式,进行了连续注CO2驱、水气交替注入、CO2吞吐等实验研究,结果表明对于该油藏条件,CO2吞吐的驱油效率可达到甚至超过水气交替注入。为进一步研究驱替机理并证明宏观实验的结论,进行了微观可视驱油实验,研究发现随着压力增加,CO2对原油性质的改变以及良好的储层物性是驱油效率明显增加的主要原因。结合该油田的实际条件和注CO2吞吐经济高效的特点,研究认为注CO2适合于该高凝油藏的开发。High pour-point oil is remarkable for high pour-point and high wax content. It is very easy to cause reservoir damage and reduce recovery factor. In order to determine a kind of reasonable production method for this block, many experiments are developed to select an optimum method of CO2 injection such as continuous CO2 injection, gas/water al- ternative drive, and CO2 huff-and-puff injection, results of these experiments indicate that all the three gas injection methods can effectively enhance the recovery factor. Among the three methods, CO2 huff-and-puff injection is the best way for actual reservoir. In order to study oil displacement mechanism and prove the macroscopic experimental conclusion, the visual microscopic displacement experiment is performed. The results show that, crude oil property changed by CO2 and better reservoir physical property are main factors for obviously increasing displacement effect with pressure in- creasing. According to the characteristics of reservoir and the economic benefits, CO2 huff-and-puff injection is thebest way for the development of this block.

关 键 词：高凝油藏 长岩心实验 CO2驱 水气交替 CO2吞吐 微观驱替实验 

分 类 号：TE349[石油与天然气工程—油气田开发工程]