Proceedings of the 3rd Annual International Conference on Mechanics and Mechanical Engineering (MME 2016)

The Mechanical Behaviour during Multiple Injections and its Influence on Fracture Network

Authors
Li-Feng Yang, Yu-Zhang Liu, Yun-Hong Ding, Yong-Hui Wang, Xiao-Sen Shang
Corresponding Author
Li-Feng Yang
Available Online December 2016.
DOI
https://doi.org/10.2991/mme-16.2017.2How to use a DOI?
Keywords
Multiple Injections, Fracturing, Shale gas, Fracture network.
Abstract
Many cases show that multiple injections fracturing serves as an effective method to increase the probability of creating complex fracture network for shale gas reservoirs. However, its mechanism is unclear. This paper, therefore, intends to use numerical simulation and theoretical models to explore this mechanism. Results indicate that the liquid fluid loss and friction along fractures act as catalysts to a large pressure drop between the initiation of fractures and the fractures tip during injection. But friction disappears when this injection terminates, and the fluid pressure decreases at the debut of fractures and increases at the fractures tips. Then the stress field changes synchronically. The probability of the extension and reorientation of fracture tip and the initiation and reorientation of weak point on the fracture surface may be multiplied. During the re-injection after a period of shut-in, the opened factures or weak points can easily propagate new fractures and does not need to overcome the resistance of the tensile strength or cohesion. Then larger volume of fracture network and more fractures can be created by multiple injections. Micro-seismic monitoring results verify the validity of the theoretical analysis and effectiveness of the method of multiple injections fracturing.
Open Access
This is an open access article distributed under the CC BY-NC license.

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Proceedings
3rd Annual International Conference on Mechanics and Mechanical Engineering (MME 2016)
Part of series
Advances in Engineering Research
Publication Date
December 2016
ISBN
978-94-6252-303-6
ISSN
2352-5401
DOI
https://doi.org/10.2991/mme-16.2017.2How to use a DOI?
Open Access
This is an open access article distributed under the CC BY-NC license.

Cite this article

TY  - CONF
AU  - Li-Feng Yang
AU  - Yu-Zhang Liu
AU  - Yun-Hong Ding
AU  - Yong-Hui Wang
AU  - Xiao-Sen Shang
PY  - 2016/12
DA  - 2016/12
TI  - The Mechanical Behaviour during Multiple Injections and its Influence on Fracture Network
BT  - 3rd Annual International Conference on Mechanics and Mechanical Engineering (MME 2016)
PB  - Atlantis Press
SN  - 2352-5401
UR  - https://doi.org/10.2991/mme-16.2017.2
DO  - https://doi.org/10.2991/mme-16.2017.2
ID  - Yang2016/12
ER  -