粒径分选性与围压对砂砾岩水力压裂破裂影响机制研究

doi:10.13722/j.cnki.jrme.2020.0006

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Abstract The particle distribution of glutenite formations is often heterogeneous，which seriously affects the fracturing effect. To ascertain the hydraulic fracturing mechanism of glutenite formations is thus one of the hottest and most difficult points in current oil and gas reservoir development. Three kinds of downhole glutenite cores with different gravel particle sizes were selected，and hydraulic fracturing tests were performed under different confining pressures to analyze the hydraulic fracturing mechanism of glutenite. The results show that, when the confining pressure is low，the fracturing curve has obvious nonlinearity in the pressurization stage and the difference(Pb－Pi) between the rupture pressure(Pb) and the initiation pressure(Pi) is large，With increasing the confining pressure，the non-linearity of the fracturing curve and the value of Pb－Pi of glutenite with poor particle size sorting decrease rapidly，while the glutenite with good gravel particle size selection has a smaller change range and smaller value of Pb－Pi. The rupture pattern appears as revolving gravel under the low confining pressure. Crack propagation evolves from crack arrest to penetration for the glutenite with poor particle size sorting when the confining pressure increases，while for good particle size sorting，the fracture morphology has no obvious relationship with the confining pressure. Fracturing fluid filtration can induce crack initiation and injection energy can affect the mechanical mechanism of cracks encountering gravel. Change of the gravel particle size selection from poor to good directly affects the reduction of the fracturing fluid filtration rate，resulting in the decrease of the fluid loss，and the increase of the crack initiation pressure. When the confining pressure increases，the injection energy increases while the crack tortuosity decreases. Related research results are expeceted to provide theoretical basis for the reconstruction of glutenite formations.

Key words： rock mechanics hydraulic fracturing glutenite rock particle size sorting fracturing mechanism fracturing fluid filtration injection energy

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	Articles by authors
	MA Dongdong1
	2
	LUO Yujie1
	2
	HU Dawei1
	2
	ZHANG Yang3
	LIU Ju3
	ZHOU Hui1
	2

Cite this article:

MA Dongdong1,2,LUO Yujie1, et al. Effects of particle size sorting and confining pressure on hydraulic fracturing mechanism of glutenite rock[J]. , 2020, 39(11): 2264-2273.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2020.0006 OR http://rockmech.whrsm.ac.cn/EN/Y2020/V39/I11/2264

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