张海龙
ZHANG Hailong

• 1:中国石油天然气股份有限公司吉林油田分公司

摘要(Abstract)：

吉林油田黑59区块CO_2驱油先导试验在注气一段时间以后,仍有部分油井不见效。为了明确影响CO_2混相驱提高石油采收率的原因,开展了岩心驱替实验和岩心核磁共振检测实验。岩心驱替实验结果表明,CO_2混相驱可以降低CO_2—原油体系的启动压力梯度。核磁共振实验结果表明,CO_2混相驱可以驱动水驱无法动用的低孔低渗储层中的原油。在室内实验研究的指导下,对现场不见效油井的低渗储层进行补孔压裂试验,见到了显著的增油效果,验证了CO_2驱在低渗透非均质储层中的驱替波及效率更高。
After a few time intervals of CO_2 flooding pilot test in Block Hei-59 in Jilin Oilfield, there are still part of the oil wells not affected. In order to clarify the reason of influencing the oil recovery enhancement of the CO_2 miscible flooding, the tests of the core flooding and core nuclear magnetic resonance detection were conducted. The results of the former test show that the CO_2 miscible flooding can reduce the start-up pressure gradient of the CO_2-crude oil system; the results of the latter test show that the CO_2 miscible flooding can displace the crude oil in the low-porosity and low-permeability reservoirs which cannot be flooded by the water. Guided by the indoor test study, the perforation adding and fracturing tests were engaged for the low-permeability reservoirs for the oil wells which were not affected in the field, the remarkable oil-incremental effect was shown, thus the fact was verified that the flooded and swept efficiencies of the CO_2 miscible flooding are more higher in the low-permeability heterogeneous reservoirs.

关键词(KeyWords)： CO_2驱;启动压力梯度;核磁共振;提高采收率
CO_2 flooding;starting pressure gradient;nuclear magnetic resonance;enhancing oil recovery

Abstract:

Keywords:

基金项目(Foundation): “十二五”国家重大科技专项“松辽盆地CO2驱油与埋存技术示范工程”(2011ZX05054)

作者(Author): 张海龙
ZHANG Hailong

DOI: 10.19597/j.issn.1000-3754.201907019

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