摘要：The activation of natural fractures may play a key role in creating complex fracture network during the hydraulic fracturing treatment. The fluid pressure on main hydraulic fracture surface can increase mean confining stress of rock around the main fracture. Natural fracture tends to stabilize when confining stress increasing. Fracturing fluid leaks from main hydraulic fracture into natural fracture causing the elevation of pore pressure in natural fracture. Shear slip may occur when pore pressure of natural fracture elevated. If the fluid pressure within the main fracture suddenly decreases, the mean confining stress of the rock around main fracture decreases quickly, while the pore fluid pressure in the natural fracture do not decrease simultaneously due to the relatively low permeability, which causes the Mohr's stress circle move to the left and natural fractures shear failure easier. In this paper, we present a cyclic treatment to enhance the degree of natural fracture activation. A numerical model is established to investigate the effect of cyclic pressure drop on natural fracture activation. The results show that cyclic treatment can significantly improve the length and permeability of activated natural fracture.
Copyright 2016 ARMA, American Rock Mechanics Association.

卷、期、页：v 2,p1634-1644

发表日期：2016-01-01

期刊分区（SCI为中科院分区）：无

收录情况：EI（工程索引）,国际学术会议论文集

发表期刊名称：50th US Rock Mechanics / Geomechanics Symposium 2016

通讯作者：李扬,曹文科,高佳佳

第一作者：邓金根,刘伟,闫伟

论文类型：会议论文

论文概要：李扬,邓金根,刘伟,闫伟,曹文科,高佳佳，The effect of cyclic pressure drop on shear activation of natural fractures，50th US Rock Mechanics / Geomechanics Symposium 2016，2016，v 2,p1634-1644

论文题目：The effect of cyclic pressure drop on shear activation of natural fractures