Experimental study on microscopic formation damage of low permeability   reservoir caused by HPG fracturing fluid

doi:10.1016/j.jngse.2016.10.063

CORC > 北京大学 > 工学院

	Experimental study on microscopic formation damage of low permeability reservoir caused by HPG fracturing fluid
	Xu, Zhichao ; Li, Zhiping ; Wang, Cai ; Adenutsi, Caspar Daniel
刊名	JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
	2016
关键词	Formation damage HPG fracturing fluid N(2)adsorption Wettability SEM PORE STRUCTURE GAS-ADSORPTION SURFACE-AREA GEL-DAMAGE CLEANUP
DOI	10.1016/j.jngse.2016.10.063
英文摘要	Hydraulic fracturing has become an important stimulation technique for low/ultra-low permeability reservoirs. Research on formation damage caused by fracturing fluid has mainly focused on permeability, sensitivity, fracturing fluid and clay minerals. However, little attention has been devoted to the microscopic changes in pore structure and properties. In this paper, nitrogen gas-adsorption techniques were introduced to characterize the microscopic changes in pore structure. Meanwhile, contact angle testing and Scanning Electron Microscope (SEM) observations were also used to show the changes in wettability and surface morphology of cores, respectively. The results showed that the pore size distributions (PSDs) of low permeability cores were wide, with approximately 75% macropore volume. The obvious changes in PSDs of damaged samples occurred in the range of 2-5 nm and 30-80 nm. The specific surface area decreased, and the adsorbability of damaged samples declined, as well. Concentrated gel and solid residues were confirmed to be the main damage mechanisms for gel breaking liquids, which resulted in changes in composition and.roughness, making the cores more hydrophilic. Based on the results of the analysis, the N-2 adsorption technique is deemed appropriate for the study of reservoir formation damage when a certain amount of mesopores are present. Additionally, a new method of determining contact angles for porous media is also recommended. (C) 2016 Elsevier B.V. All rights reserved.; Beijing Municipal Natural Science Foundation [3162026]; SCI(E); ARTICLE; wendaocao123@163.com; 486-495; 36
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/458510]
专题	工学院
推荐引用方式 GB/T 7714	Xu, Zhichao,Li, Zhiping,Wang, Cai,et al. Experimental study on microscopic formation damage of low permeability reservoir caused by HPG fracturing fluid[J]. JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING,2016.
APA	Xu, Zhichao,Li, Zhiping,Wang, Cai,&Adenutsi, Caspar Daniel.(2016).Experimental study on microscopic formation damage of low permeability reservoir caused by HPG fracturing fluid.JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING.
MLA	Xu, Zhichao,et al."Experimental study on microscopic formation damage of low permeability reservoir caused by HPG fracturing fluid".JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING (2016).