ABSTRACT: Recent experiments and field observations show that fractured geomaterials exhibit hierarchal crack networks and fluid-flow capillary networks at multiple scales. Fracturing is often associated with non-linear material response such as plasticity and softening. We present a novel non-local continuum damage model for hydraulic fracturing. The model accounts for the crack networks by the introduction of non-local damage, and the presence of long-range sub-scale capillary networks is represented using non-local transport. Cracks are modeled as regions of the continuum featuring degraded stiffness as well as elevated permeability; which allows the model to represent the key characteristics of hydraulic fracturing. The model is implemented in a non-linear mixed finite element framework and used to solve benchmark hydraulic fracturing and shear loading problems. It is shown that the model adequately represents elevated fluid velocity inside the fluid-driven crack and is able to successfully represents changes to pore pressure at damaged material points, including pressure rise until breakdown point as well as stagnating open-fracture pressure. The analysis shows the influence of the variation of the non-local length scale parameters for the damage and transport. The results indicate that porous media featuring more widespread sub-scale networks exhibit shorter and wider fluid-driven fractures. The presented model provides a tool for the calculation and prediction of fracking fluid leak-off from the major crack to the surrounding porous media.
Skip Nav Destination
Non-Local Continuum Damage and Transport Modeling Framework for Hydraulic Fracturing
Mostafa E. Mobasher;
Mostafa E. Mobasher
New York University Abu Dhabi
Search for other works by this author on:
Haim Waisman
Haim Waisman
Columbia University, New York
Search for other works by this author on:
Paper presented at the ARMA/DGS/SEG International Geomechanics Symposium, Virtual, November 2021.
Paper Number:
ARMA-IGS-21-025
Published:
November 01 2021
Citation
Mobasher, Mostafa E., and Haim Waisman. "Non-Local Continuum Damage and Transport Modeling Framework for Hydraulic Fracturing." Paper presented at the ARMA/DGS/SEG International Geomechanics Symposium, Virtual, November 2021.
Download citation file:
Sign in
Don't already have an account? Register
Personal Account
You could not be signed in. Please check your username and password and try again.
Could not validate captcha. Please try again.
Pay-Per-View Access
$20.00
Advertisement
28
Views
Advertisement
Suggested Reading
Advertisement