一种实用的CO_2溶解气驱岩心洗油方法  

A practical core cleaning method based on CO_2 dissolved gas drive

作　　者：韩学辉[1] 杨龙[2] 王洪亮[3] 王雪亮[3] 房涛[3] 张娟娟[3] 

机构地区：[1]中国石油大学(华东)地球科学与技术学院,山东青岛266580 [2]中国石油天然气股份有限公司新疆油田公司实验检测研究院,新疆克拉玛依834000 [3]中国石油天然气股份有限公司西部钻探工程有限公司测井公司,新疆克拉玛依834000

出　　处：《石油实验地质》2013年第1期111-114,共4页Petroleum Geology & Experiment

基　　金：山东省自然科学基金(Y2008E08);国家油气专项(2011ZX05009-003)联合资助

摘　　要：为了提高岩心的洗油效率,开发了一种实用的CO2溶解气驱岩心洗油方法。该方法在Stewart设计的CO2溶解气驱方法的基础上,增加了洗油室抽真空、CO2预清洗、溶剂回收3个步骤。使用自行研制的DGO-1型CO2溶解气驱洗油装置,实验考察了新方法的洗油效果。6块不同孔隙度、渗透率的岩心的洗油结果表明,经过6～10次CO2溶解气驱后,岩心荧光级别均小于3级,孔隙度和渗透率趋于稳定,可满足石油天然气行业标准SY/T 5336-2006的要求,且洗油时间(2～3天)较常规脂肪抽提洗油(2～3周或更长)有大幅度减少。该方法洗油原理清楚,洗油装置简单,易于操作,洗油效率高,清洁环保,推荐作为一种实用方法在岩石物理实验室推广使用。In order to improve the efficiency of core cleaning, a practical core cleaning method based on CO2 dissolved gas drive was developed. The method added vacuum-pumping, CO2 pre-cleaning and solvent recovery to the method designed by Stewart in 1952. Then, the effect of core cleaning was observed through a series of experiment with the employment of DGO-1 type CO2 dissolved gas drive core cleaning device which was self-made. The results of core cleaning of 6 rocks with different porosities and permeabilities showed that the fluorescence level was less than 3 and the porosity and permeability were steady after 6-10 circles. The effect met the stand- ard SY/T 5336-2006. The period of core cleaning with the employment of the new method was 2-3 days, which was less than that of Soxhlet extraction device （2-3 weeks or longer）. Since the method had the characteristics of clear principle, simple device, good operability , high efficiency and was environmental-friendly, it was recommended to popularize in rock physics lab.

关 键 词：CO2溶解气驱 岩心洗油 CO2预清洗 荧光级别 孔隙度 渗透率 

分 类 号：TE135.1[石油与天然气工程—油气勘探]