干旱区生态环境知识资源中心(Arid): Digital quantification of fracture in full-scale rock using micro-CT images: A fracturing experiment with N-2 and CO2

Arid

DOI	10.1016/j.petrol.2020.107682
	Digital quantification of fracture in full-scale rock using micro-CT images: A fracturing experiment with N-2 and CO2
	Yang, Bing; Wang, Haizhu; Wang, Bin; Shen, Zhonghou; Zheng, Yong; Jia, Zhaoyang; Yan, Wanjuan
通讯作者	Wang, HZ (corresponding author), China Univ Petr, State Key Lab Petr Resources & Prospecting, Beijing 102249, Peoples R China.
来源期刊	JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
ISSN	0920-4105
EISSN	1873-4715
出版年	2021
卷号	196
英文摘要	How to effectively and cleanly exploit unconventional resources is currently being widely concerned. Due to the unavoidable limitations of water-based fracturing, CO2 and N-2 etc., are regarded as alternative fluids for some specific reservoirs such as the arid area or high clay swelling formation. To investigate the characteristics of fracture induced by nonaqueous fluid in unconventional fight formation, fracturing experiments on fight sandstone using different fluid of water, N-2, liquid CO2 (L-CO2) and supercritical CO2 (SC-CO2) were conducted. A novel fracture analysis approach based on CT scanning is also proposed to quantitatively analyze the micromorphology of fractures including fracture network pattern, fractal dimension (FD), aperture, area ratio (AR) and fracture volume etc. Results show that water and N-2 can only induce a relatively simple fracture pattern. Whereas, fractures induced by CO2-based fluid have more complex fracture geometry with many fracture branches and various propagation orientations. Quantitative analysis based on image processing and fracture reconstruction algorithm indicates that the CO2-based fluid has up to 4.4 times larger fracture-induced capacity and can create fracture with up to 2.6 times higher complexity and 23.4% higher roughness than that generated by water-based fracturing. Comparing to SC-CO2, L-CO2 and water, N-2 has the least fracture-induced capacity (83% of water) and produces more smooth and uniform fractures. On the other hand, the distributions of deviation angle suggest that fracture propagation is not only influenced by stress state, but also significantly affected by the original bedding plane. This experimental study proposes a precise and effective approach for fracture characteristic quantification, which can be further implemented into fracture simulation model. It also provides theoretical reference and guidance for field operation of waterless fracturing in development of unconventional oil and gas.
英文关键词	Supercritical CO2 Fracturing laboratory experiment CT scanning Fracture reconstruction Quantitative fracture analysis
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000600808100052
WOS关键词	SUPERCRITICAL CARBON-DIOXIDE ; INITIATION PRESSURE ; SHALE GAS ; WATER ; FLUIDS ; PROPAGATION ; OIL ; SKELETONIZATION ; PERMEABILITY ; EXTENSION
WOS类目	Energy & Fuels ; Engineering, Petroleum
WOS研究方向	Energy & Fuels ; Engineering
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/348032
作者单位	[Yang, Bing; Wang, Haizhu; Shen, Zhonghou; Zheng, Yong; Jia, Zhaoyang; Yan, Wanjuan] China Univ Petr, State Key Lab Petr Resources & Prospecting, Beijing 102249, Peoples R China; [Wang, Bin] Louisiana State Univ, Craft & Hawkins Dept Petr Engn, Baton Rouge, LA 70803 USA
推荐引用方式 GB/T 7714	Yang, Bing,Wang, Haizhu,Wang, Bin,et al. Digital quantification of fracture in full-scale rock using micro-CT images: A fracturing experiment with N-2 and CO2[J],2021,196.
APA	Yang, Bing.,Wang, Haizhu.,Wang, Bin.,Shen, Zhonghou.,Zheng, Yong.,...&Yan, Wanjuan.(2021).Digital quantification of fracture in full-scale rock using micro-CT images: A fracturing experiment with N-2 and CO2.JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING,196.
MLA	Yang, Bing,et al."Digital quantification of fracture in full-scale rock using micro-CT images: A fracturing experiment with N-2 and CO2".JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING 196(2021).