Mechanism of hydraulic fracture propagation and seepage pattern in naturally fractured reservoirs

被引：0

作者：

Chong Z. ^{[1
,2
]}

Yan L. ^{[1
]}

Gao X. ^{[2
]}

Li X. ^{[1
]}

Yao Q. ^{[1
]}

Zheng C. ^{[1
]}

机构：

[1] Key Laboratory of Deep Coal Resource Mining, School of Mines, China University of Mining and Technology, Xuzhou

[2] Xi'an University of Science and Technology, State Key Laboratory of Coal Resources in Western China, Xi'an

来源：

| 1600年 / China University of Mining and Technology卷 / 37期

关键词：

Discrete element model; Hydraulic fracturing; Interaction model; Naturally fractured reservoirs; Seepage pattern;

D O I：

10.13545/j.cnki.jmse.2020.06.022

中图分类号：

学科分类号：

摘要：

The stress fields generated by hydraulic fracture initiation, propagation and interaction models with natural fractures have been analysed in this paper. The fluid-solid coupled discrete element model of naturally fractured reservoirs has been established, and the interaction models generated by hydraulic fractures and natural fractures have been classified. It also revealed the effect of three factors on the formation of discrete fracture networks and seepage patterns. The results have demonstrated that during the change of the pole angle of the injection hole, the radial stress fluctuates less, and the circumferential stress and the shear stress change periodically. Propagation and seepage patterns of hydraulic fractures eventually appear one or several combinations of four interaction modes. The branched and crossing models are the easiest to form a discrete fracture network, and the seepage area is also widely distributed. However, the branched interaction model can activate natural fractures easily during fracturing. With the increase of the confining pressure, the total number of hydraulic fractures increases. The tensile fractures in the sandstone matrix always dominate and control the total number of hydraulic fractures. With the increase of the approaching angle, shear fractures in natural fractures become the main type of dominant fracture changes. © 2020, Editorial Board of Journal of Mining & Safety Engineering. All right reserved.

引用

页码：1263 / 1273

页数：10

共 19 条

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