Microscopic production characteristics of tight oil in the nanopores of different CO2-affected areas from molecular dynamics simulations

doi:10.1016/j.seppur.2022.122607

IMECH-IR > 流固耦合系统力学重点实验室

	Microscopic production characteristics of tight oil in the nanopores of different CO2-affected areas from molecular dynamics simulations
	Luo, Yongcheng; Liu, Xiangui; Xiao, Hanmin; Zheng TY(郑太毅)
通讯作者	Luo, Yongcheng(luoyongcheng18@mails.ucas.ac.cn) ; Xiao, Hanmin(xiaohm69@petrochina.com.cn)
发表期刊	SEPARATION AND PURIFICATION TECHNOLOGY
	2023-02-01
卷号	306 页码:18
ISSN	1383-5866
摘要	Understanding the mechanisms of CO2 extraction or flooding are vital for enhancing oil recovery (EOR) in tight reservoirs. In this study, the CO2 EOR mechanism in the displacement-affected area (DPAA) and diffusionaffected area (DFAA) of quartz nanopores were thoroughly investigated using molecular dynamics simulation techniques. First, the following two contents were mainly simulated, namely CO2 flooding oil in the single/ double nanopores of DPAA and CO2 extraction oil in dead-end nanopores of the DFAA with and without the water film. Then, tight oil potential energy, threshold capillary pressure, CO2 solubility, and oil swelling in nanopores were calculated to clarify the effects of CO2 on oil transport. Moreover, different CO2 injection/ flowback rates and different water film thicknesses on dead-end nanopores on oil recovery were discussed. In the DPAA, the CO2 solubility and the oil swelling factor gradually decreased with distance from the CO2-oil interface (Y = 0 nm), where the higher the injection rate, the more easily the CO2 dissolved in the oil. However, the injection rate of CO2 was inversely proportional to oil recovery. In addition, it took longer for the displacement efficiency in the 6 nm pore of double pores to reach the same displacement efficiency as in the single 6 nm pore. In the DFAA, the effect of flowback rate on the displacement efficiency of oil was relatively low. However, the thickness of the water film was a key factor that affected the oil displacement efficiency in the DFAA.
关键词	CO 2 EOR Displacement -affected area Diffusion -affected area Nanopores CO 2 solubility Oil swelling Oil potential energy
DOI	10.1016/j.seppur.2022.122607
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000913355100003
关键词[WOS]	DISPLACEMENT MECHANISM ; INORGANIC NANOPORES ; SUPERCRITICAL CO2 ; WATER ; TRANSPORT ; RECOVERY ; EQUILIBRIA ; INSIGHTS ; MODELS ; PHASE
WOS研究方向	Engineering
WOS类目	Engineering, Chemical
资助项目	China National Petroleum Corpo- ration (CNPC) basic advanced reserve technology ; [2021DJ2201]
项目资助者	China National Petroleum Corpo- ration (CNPC) basic advanced reserve technology
论文分区	一类
力学所作者排名	3+
RpAuthor	Luo, Yongcheng ; Xiao, Hanmin
引用统计	被引频次：8[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/91570
专题	流固耦合系统力学重点实验室
推荐引用方式 GB/T 7714	Luo, Yongcheng,Liu, Xiangui,Xiao, Hanmin,et al. Microscopic production characteristics of tight oil in the nanopores of different CO2-affected areas from molecular dynamics simulations[J]. SEPARATION AND PURIFICATION TECHNOLOGY,2023,306:18.
APA	Luo, Yongcheng,Liu, Xiangui,Xiao, Hanmin,&郑太毅.(2023).Microscopic production characteristics of tight oil in the nanopores of different CO2-affected areas from molecular dynamics simulations.SEPARATION AND PURIFICATION TECHNOLOGY,306,18.
MLA	Luo, Yongcheng,et al."Microscopic production characteristics of tight oil in the nanopores of different CO2-affected areas from molecular dynamics simulations".SEPARATION AND PURIFICATION TECHNOLOGY 306(2023):18.

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