油气藏评价与开发 >
2021 , Vol. 11 >Issue 6: 845 - 851
DOI: https://doi.org/10.13809/j.cnki.cn32-1825/te.2021.06.007
超临界CO2萃取致密砂砾岩中原油效果影响因素实验研究
收稿日期: 2020-08-25
网络出版日期: 2021-12-31
基金资助
国家科技重大专项“准噶尔盆地致密油开发示范工程”(2017ZX05070)
Experimental researches on factors influencing supercritical CO2 extraction effect of crude oil from tight sandy conglomerate
Received date: 2020-08-25
Online published: 2021-12-31
为提高致密砂砾岩油藏原油采收率,基于新疆玛湖致密砂砾岩油藏储层条件,通过利用超临界CO2萃取致密砂砾岩岩心中的致密油,采用单因素分析法依次对影响致密油萃取效果的压力（7~25 MPa）、温度（30~60oC）、浸泡时间（30~180 min）及循环时间（30~180 min）,共4项生产参数进行了优化分析。结果表明：超临界CO2能够萃取出致密砂砾岩中原油且效果较好,萃取率最高可达25.22 %。通过对以上4项生产参数进行4因素3水平的正交设计实验L9（34）,发现影响超临界CO2萃取原油效果的因素具有主次顺序：压力>浸泡时间>温度>循环时间。最优参数方案为：压力25 MPa,温度50oC,浸泡时间120 min,循环时间150 min。致密砂砾岩储层应用CO2萃取原油具有良好的应用前景。
户海胜 , 高阳 , 单江涛 , 雷现梅 , 张玉龙 , 张广超 , 叶仲斌 . 超临界CO2萃取致密砂砾岩中原油效果影响因素实验研究[J]. 油气藏评价与开发, 2021 , 11(6) : 845 -851 . DOI: 10.13809/j.cnki.cn32-1825/te.2021.06.007
In order to improve the oil recovery of tight sandy conglomerate reservoir, the tight oil in the tight glutenite core is extracted by the supercritical CO2 based on the reservoir conditions of Mahu tight sandy conglomerate reservoir in Xinjiang. And then, four production parameters affecting tight oil extraction, which are the pressure（7~25 MPa）, the temperature（30~60 ℃）, the soaking time（30~180 min） and the cycle time（30~180 min）, have been optimized and analyzed by the single factor analysis method. The results show that the supercritical CO2 can extract the crude oil from the tight glutenite with relatively good effects, and the extraction rate can reach up to 25.22 %. By the orthogonal design experiment L9（34） with four factors and three levels for the above four production parameters, it is found that the factors influencing the extraction effect of crude oil by supercritical CO2 have primary and secondary order: pressure > immersion time > temperature > circulating time. The optimal parameter scheme is the pressure of 25 MPa, tht temperature of 50 ℃, the soaking time of 120 min, and the cyclic time of 150 min. The application of CO2 to extract crude oil in tight glutenite reservoirs has good application prospects.
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