多簇水力裂缝起裂与扩展物理模拟试验系统研制及验证

doi:10.13722/j.cnki.jrme.2021.0058

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Abstract Horizontal well segmented multi-cluster fracturing technology is a core technical means for the development of shale gas reservoirs. For truly simulating the multi-cluster fracturing progress to reveal the propagation law and mutual interference mechanism of multiple fractures within the segments，a physical simulation experiment system for the initiation and propagation of multi-cluster hydraulic fractures was developed based on an existing large triaxial hydraulic fracturing experiment system，by designing a multi-channel fracturing wellbore and composite wrapped layered artificial specimens and equipping a multi-cluster shunt and monitoring system and a strain monitoring system. The advantages and innovations of the test system include that：(1) a number of independent fracture positions can be set in the multi-channel fracturing wellbore to guarantee the sufficient fracture propagation at each perforation cluster，(2) composite wrapped layered artificial fracturing cube samples with a side length of 500 mm can be prepared by considering the maximum allowable sample size of the testing machine，the maximum fracture propagation path，the stress interference between fractures，the pressure maintenance after fracture initiation and propagation，the influence of bedding and other factors，(3) the multi-cluster shunt and monitoring system can monitor the instantaneous flow rate，the pressure and the cumulative injection volume of each cluster channel in real time，which is helpful to understand the flow competition and allocation mechanism，(4) the strain monitoring system can monitor and record the deformation characteristics of the rock mass around each perforation cluster and fracture propagation path in real time during the fracturing process，which could be used for explaining the propagation behavior of hydraulic fractures，and (5) the system can not only simulate the initiation and propagation of multiple clusters of fractures，but also imitate the ball-sealer in-stage diversion technology and re-fracturing after the initial fracturing by selectively shutting a number of channels with sufficient fluid intake. A true triaxial multi-cluster fracturing test was carried out to verify the effectiveness of the system. The test results show that the breakdown pressure of the subsequent perforation clusters gradually increases while the corresponding stimulated area decreases. The developed experiment system provides a new method for the study of multi-cluster fracturing，which can promote the in-depth study of the initiation and propagation of multi-cluster hydraulic fractures and the stress interference mechanism between the fractures.

Key words： rock mechanics multi-cluster hydraulic fracturing physical simulation experiment system multiple fractures propagation strain monitoring

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	Articles by authors
	BI Zhenhui1
	WANG Lei2
	YANG Hanzhi1
	GUO Yintong2
	ZHOU Jun2
	CHANG Xin2
	YANG Chunhe1
	2

Cite this article:

BI Zhenhui1,WANG Lei2,YANG Hanzhi1, et al. Development and verification of a physical simulation experiment system for initiation and propagation of multiple clusters of hydraulic fractures[J]. , 2021, 40(11): 2273-2285.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0058 OR https://rockmech.whrsm.ac.cn/EN/Y2021/V40/I11/2273

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