Influence of overburden hydration on fracture propagation of shale under three-dimensional stress

被引：0

作者：

Wang X. ^{[1
]}

Li D. ^{[2
]}

Jiang W. ^{[1
]}

Lu H. ^{[1
]}

Yi X. ^{[1
]}

Zou Q. ^{[2
]}

Wang T. ^{[1
]}

Xiu N. ^{[1
]}

Tang W. ^{[2
]}

Li T. ^{[2
]}

机构：

[1] PetroChina Research Institute of Petroleum Exploration & Development, Langfang, 065007, Hebei

[2] Petro-China Zhejiang Oilfield Company, Hangzhou, 310023, Zhejiang

来源：

Natural Gas Industry | 2019年 / 39卷 / 06期

关键词：

Complex fracture; Flow-back system; Inclinometer; Shale gas; Shale hydration; Three-dimensional stress; Treatment pressure; Well soaking after fracturing;

D O I：

10.3787/j.issn.1000-0976.2019.06.009

中图分类号：

学科分类号：

摘要：

Most of the previous shale hydration experiments were under normal pressure or low confining pressure, but whether shale hydration still exists and what effect it has on the complexity of hydraulic fracture remain to be explored. To clarify the influence of shale hydration time on the complexity of hydraulic fracture under formation stress, a physical simulation test equipment for real three-dimensional hydraulic fracturing was employed to perform experiments of hydraulic fracturing under formation stress considering the hydration time based on similarity criterion, the development characteristics of hydraulic fractures in shale at different hydration times were analyzed, and field hydration was tested. The results show that, under three-dimensional stress, the complexity of fractures generated after hydration of rock samples is higher. The effect of shale hydration is determined by hydration time, and the longer the hydration time is, the greater effect it has, and the more complex the generated fractures are. Shale hydration will produce significantly complex and numerous fractures, resulting in the increase of flow friction and treatment pressure, which is not conducive to later construction. The volume fraction of vertical fractures produced after fracturing of horizontal well hydration test section is lower than that of unfractured section. This indicate that hydration plays a role in increasing the complexity of fracturing.

引用

页码：81 / 86

页数：5

共 18 条

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