文章基本信息

标题：The optimization of pre-slug size in CO2-N2 compound flooding
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作者：Taoping Chen ; Wen Sun ; Guofang Zhang 等
期刊名称：E3S Web of Conferences
印刷版ISSN：2267-1242
电子版ISSN：2267-1242
出版年度：2020
卷号：206
页码：2017-2022
DOI：10.1051/e3sconf/202020602017
出版社：EDP Sciences
摘要：In order to enhance oil recovery in low and ultra-low permeability layer, both of the numerical simulation and physical model experiment have been researched. First, the dynamic distribution of CO 1 and N 1 in the oil and gas phase in the CO 2 -N 2 compound flooding process was numerically simulated by using the long slim-tube model. The results show that the CO 2 slug should have at least 0.3 PV to prevent the impact of N 2 channeling effectively. Second, under the experimental conditions of complete miscibility of CO 2 -crude oil, the two types of natural cores including low and ultra-low permeability, respectively, are used for experimental study on oil displacement. The results confirm that CO 2 -N 2 compound flooding with 0.3 PV CO 2 pre-slug can achieve a good result. Finally, a five-point well pattern element model is established by CMG. The recovery and the gas cost of per ton of oil are calculated respectively for CO 2 -N 2 compound flooding and full CO 2 flooding at 300 m well spacing of low and ultra-low permeability layer. According to the simulation results, the optimal CO 2 pre-slug size in CO 2 -N 2 compound flooding under the condition of low and ultra-low permeability layer five-point well pattern is 0.4 PV.