Experimental Study on the Initiation and Propagation of Multi-Cluster Hydraulic Fractures within One Stage in Horizontal Wells

doi:10.3390/en14175357

	Experimental Study on the Initiation and Propagation of Multi-Cluster Hydraulic Fractures within One Stage in Horizontal Wells
	Bi, Zhenhui 1,2; Wang, Lei 1; Yang, Hanzhi 2; Guo, Yintong 1; Chang, Xin 1; Zhou, Jun 3
刊名	ENERGIES
	2021-09-01
卷号	14 期号:17 页码:21
关键词	multi-channel hydraulic fracturing physical simulation initiation and propagation of multiple fractures multiple fractures interaction strain response characteristics
DOI	10.3390/en14175357
英文摘要	Competitive propagation of fractures initiated from multiple perforation clusters is universal in hydraulic fracturing of unconventional reservoirs, which largely influences stimulation. However, the propagation mechanism of multi-fractures has not been fully revealed for the lack of a targeted laboratory observation. In this study, a physical simulation experiment system was developed for investigating the initiation and propagation of multi-cluster hydraulic fractures. Different from the traditional hydro-fracking test system, the new one was equipped with a multi-channel shunting module and a strain monitoring system, which could guarantee the full fracture extension at each perforation clusters and measure the internal deformation of specimens, respectively. Several groups of true tri-axial fracturing tests were performed, considering the factors of in situ stress, cluster spacing, pumping rate, and bedding structures. The results showed that initiation of multi-cluster hydraulic fractures within one stage could be simultaneous or successive according to the difference of the breakdown pressure and fracturing fluid injection. For simultaneous initiation, the breakdown pressure of the subsequent fracture was lower than or equal to the value of the previous fracture. Multiple fractures tended to attract and merge. For successive initiation, the breakdown pressures of fractures were gradually increasing. The subsequent fracture tended to intersect with or deviated from the previous fracture. Multiple fractures interaction was aggravated by the decrease of horizontal stress difference, bedding number and cluster spacing, and weakened by the increase of pump rate. The propagation area of multiple fractures increased with the pump rate, decreased with the cluster spacing. The strain response characteristics corresponded with the initiation and propagation of fracture, which was conducive to understanding the process of the fracturing. The test results provide a basis for optimum design of hydraulic fracturing.
资助项目	Project of Science and Technology Department of Sinopec[P21056] ; National Natural Science Foundation of China[51809259] ; CAS Pioneer Hundred Talents Program[Y826031C01]
WOS研究方向	Energy & Fuels
语种	英语
出版者	MDPI
WOS记录号	WOS:000694101100001
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/27891]
专题	中科院武汉岩土力学所
通讯作者	Guo, Yintong
作者单位	1.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China 2.Chongqing Univ, State Key Lab Coal Mine Disaster Dynam & Control, Chongqing 400044, Peoples R China 3.China Natl Offshore Oil Corp, Res Inst, Beijing 100028, Peoples R China
推荐引用方式 GB/T 7714	Bi, Zhenhui,Wang, Lei,Yang, Hanzhi,et al. Experimental Study on the Initiation and Propagation of Multi-Cluster Hydraulic Fractures within One Stage in Horizontal Wells[J]. ENERGIES,2021,14(17):21.
APA	Bi, Zhenhui,Wang, Lei,Yang, Hanzhi,Guo, Yintong,Chang, Xin,&Zhou, Jun.(2021).Experimental Study on the Initiation and Propagation of Multi-Cluster Hydraulic Fractures within One Stage in Horizontal Wells.ENERGIES,14(17),21.
MLA	Bi, Zhenhui,et al."Experimental Study on the Initiation and Propagation of Multi-Cluster Hydraulic Fractures within One Stage in Horizontal Wells".ENERGIES 14.17(2021):21.