Effects of bedding direction on brine imbibition in Lower Shaximiao tight sandstone: An NMR analysis

doi:10.1016/j.petrol.2021.110006

	Effects of bedding direction on brine imbibition in Lower Shaximiao tight sandstone: An NMR analysis
	Xu, Liang 2,3; Li, Qi 2,3; Myers, Matthew 1; Tan, Yongsheng 2,3
刊名	JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
	2022-03-01
卷号	210 页码:11
关键词	Spontaneous imbibition Tight gas reservoir Water block effect Bedding angle Imbibition efficiency
ISSN号	0920-4105
DOI	10.1016/j.petrol.2021.110006
英文摘要	Spontaneous imbibition phenomenon caused by capillarity plays an important role in the production of tight sandstone gas. Understanding the effects of bedding direction on liquid imbibition is important as it can give insights into water block phenomena that can negatively impact gas production. In this paper, four tight sandstone specimens were cored from Sichuan Basin, China with different bedding directions (i.e., the angles between the bedding plane and the horizontal plane of four specimens are 0 degrees, 45 degrees, 60 degrees and 90 degrees, respectively). Nuclear magnetic resonance (NMR) technique was used to monitor the fluid distribution changes during the spontaneous imbibition processes of these specimens. The results show that such tight sandstone exhibited strong hydrophilicity with the small pores dominating throughout the imbibition process. The T2 spectra for all four rocks specimens not only increased upward but also shifted to larger relaxation times due to brine intake along the minerals surface (further indicating the hydrophilic characteristics of this rock). For such tight sandstone, capillary force and friction resistance between the fluid (brine) and mineral surfaces controlled the imbibition processes. For the 0 degrees, 45 degrees and 60 degrees specimens, "stop illusion" phenomena which the imbibed brine volume had a tiny increase during a long period occurred. However, this was not observed in the 90 degrees specimen (where the bedding direction and fluid flow direction are parallel). This is largely attributed to the significant tortuosity in the flow for the 0 degrees, 45 degrees and 60 degrees specimens compared to the 90 degrees specimen, leading the smallest friction resistance existed in the 90 degrees specimen. Among these four specimens, the 0 degrees specimen had the slowest imbibition rate and lowest imbibition efficiency, while the 90 degrees specimen exhibited the fastest rate and highest efficiency. With the aim of maximizing gas production, this work provides some guidance for the selection of directional fracturing and injection-production methods in the exploitation and production of tight sandstone gas field.
资助项目	National Natural Science Foundation of China[41872210] ; National Natural Science Foundation of China[41274111] ; Open Research Fund of State Key Laboratory of Geomechanics and Geotechnical Engineering[Z020001]
WOS研究方向	Energy & Fuels ; Engineering
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000736199500002
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/30863]
专题	中科院武汉岩土力学所
通讯作者	Li, Qi
作者单位	1.CSIRO Energy, Australian Resources Res Ctr, 26 Dick Perry Ave, Kensington, WA 6151, Australia 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China
推荐引用方式 GB/T 7714	Xu, Liang,Li, Qi,Myers, Matthew,et al. Effects of bedding direction on brine imbibition in Lower Shaximiao tight sandstone: An NMR analysis[J]. JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING,2022,210:11.
APA	Xu, Liang,Li, Qi,Myers, Matthew,&Tan, Yongsheng.(2022).Effects of bedding direction on brine imbibition in Lower Shaximiao tight sandstone: An NMR analysis.JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING,210,11.
MLA	Xu, Liang,et al."Effects of bedding direction on brine imbibition in Lower Shaximiao tight sandstone: An NMR analysis".JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING 210(2022):11.