水平井多段压裂多裂缝扩展形态计算方法

doi:10.13722/j.cnki.jrme.2015.1365

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Abstract For the issue of multi-fracture geometry by multi-stage fracturing in horizontal wells，a multi-fracture propagation-path algorithm was proposed，by incorporating a 3D-fracture stress field calculation model based on displacement discontinuity method，different fracture boundary conditions and subcritical fracture growth law. The algorithm was validated by UFM. Multi-fracture propagation paths for multi-stage fracturing in horizontal wells were investigated by the algorithm，and the results show that later fractures curve toward or away from previous pressurized fractures，while later fractures keep straight paths affected by sand-filled fractures. The exterior fractures propagate dominantly，but the inner fractures were suppressed due to stress shadow effect. Later fractures deviate toward the previous pressurized fracture when the ratio of fracture spacing to fracture height is less than one，and the smaller the ratio，the larger the deviation angle，otherwise they deviate away from the previous pressurized fracture or propagate straightly. The smaller the ratio of fracture spacing to fracture height，or the larger the ratio of net pressure to principle stress difference，the larger the deviation angle for two simultaneous- propagation fractures. Increasing the ratio of fracture spacing to fracture height promotes uniform fracture-length distribution，while changing the ratio of net pressure to principle stress difference can not change fracture-length distribution for multi-fractures by multi-cluster fracturing.

Key words： rock mechanics multi-stage fracturing multiple fractures displacement discontinuity method stress interference propagation path calculation model

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	Articles by authors
	CHEN Ming1
	XU Yun2
	3
	WENG Dingwei2
	3

Cite this article:

CHEN Ming1,XU Yun2,3, et al. Calculation method for multi-fracture propagation geometry of multi-stage fracturing in horizontal wells[J]. , 2016, 35(S2): 3906-3915.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2015.1365 OR https://rockmech.whrsm.ac.cn/EN/Y2016/V35/IS2/3906

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