基于微元法的低渗透储层定向射孔转向压裂裂缝动态扩展模型

doi:10.13722/j.cnki.jrme.2019.0753

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Abstract In order to clarify the propagation track and the variation rule of deflection distance of fractures during oriented perforation steering fracturing in low permeability unconventional oil and gas reservoirs，a dynamic propagation model for oriented perforation steering fracturing cracks based on microelement method was established by comprehensively considering the influences of horizontal in situ stress difference，perforation parameters，injection parameters and formation mechanical parameters. The model completes the cyclic iteration calculation between the minor step increment and the propagation deflection angle of the crack tip using a calculation program compiled by Visual Basic，and realizes the simulation of the dynamic propagation of steering fractures. The accuracy of the MEM model was verified by comparing the differences among fracture trajectories calculated by MEM model and extended finite element(XFEM) model，micro-seismic monitoring values in the fracturing field and indoor fracturing test results. Taking the tight sandstone reservoir of Shihezi Formation in Linxing block as an example，the influence mechanisms of various factors on the deflection distance of the hydraulic fracture trajectory were studied. The results show that，compared with the XFEM model，the hydraulic fracture trajectory simulated by the proposed model better matches with the micro-seismic monitoring results. The deflection distance decreases negatively logarithmically with increasing horizontal in situ stress difference while increases linearly with increasing the perforated angle，injection rate and viscosity. The perforation length has little effect on the deflection distance. The research work is significant to further understand oriented perforation steering fracturing.

Key words： rock mechanics microelement method low permeability reservoir oriented perforation steering fracturing dynamic fracture propagation model

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	Articles by authors
	HE Feifei
	ZHANG Runxu
	KANG Tianhe
	KANG Jianting
	GUO Junqing

Cite this article:

HE Feifei,ZHANG Runxu,KANG Tianhe, et al. Dynamic propagation model for oriented perforation steering fracturing cracks in low permeability reservoirs based on microelement method[J]. , 2020, 39(4): 782-792.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2019.0753 OR http://rockmech.whrsm.ac.cn/EN/Y2020/V39/I4/782

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