The Influence of Natural Crack Distribution Uniformity on the Breakdown Pressure and Fracture Mode

DOI

10.2991/gcmce-17.2017.32How to use a DOI?

Keywords

Distribution uniformity index (DUI); Bonded Particle Method (BPM); PFC3D numerical model; Breakdown pressure; Fracture mode

Abstract

The spatial distribution of the hydraulic fractures is mainly controlled by two processes of crack initiation and propagation. It is the premise of predicting the geometric structure of fracture network to study the mechanism of crack initiation of rock. There are a large number of initial micro cracks in the shale reservoir, the presence of these micro cracks weakens the integrity of shale, it must have an important influence on the initiation and propagation of hydraulic fractures. The numerical model of simulating the breakdown pressure and fracture mode of low permeability fractured reservoir is established based on the calculation method of distribution uniformity index. The influence of initial micro crack distribution uniformity on the breakdown pressure and fracture mode is studied. Numerical results show that: the greater the distribution uniformity index of the initial natural micro cracks, the greater the breakdown pressure is; But the accumulative number of tensile and shear fractures and their proportion to the total number of fractures are not affected by the distribution uniformity index of the natural micro cracks.

Copyright

© 2017, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Peihuo Peng
PY  - 2017/06
DA  - 2017/06
TI  - The Influence of Natural Crack Distribution Uniformity on the Breakdown Pressure and Fracture Mode
BT  - Proceedings of the 2017 Global Conference on Mechanics and Civil Engineering (GCMCE 2017)
PB  - Atlantis Press
SP  - 162
EP  - 168
SN  - 2352-5401
UR  - https://doi.org/10.2991/gcmce-17.2017.32
DO  - 10.2991/gcmce-17.2017.32
ID  - Peng2017/06
ER  -