The most important consideration for geothermal energy development in non-hydrothermal scenarios is the use of hydraulic fracturing technology to establish an effective network pathway to conduct fluid from injector(s) to producer(s). The number of interconnected fractures and their deformation of the network pathway becomes an important parameter to characterize effective conductivity in geothermal reservoirs. A coupled hydro-mechanical model is used to study conductivity aperture changes by taking account the effect of fracture deformation. The deformation characteristics described invoke a pre-peak linear elastic constitutive relationship and non-linear elastic-plastic constitutive behavior after the peak stress is reached. Starting with accepted dynamic friction-weakening, a hydraulic aperture concept is superimposed and modifications are suggested to available post-peak elastic-plastic constitutive models. Displacement discontinuity method (DDM) is used to construct a boundary element method, which is able to analyze the induced stress field around the unconnected natural fracture. As a result, the unconnected fracture will be in a new stress zone which includes in-situ stress and induced stress. The Barton criterion is used to judge the stability of the disconnected fractures under the new stress field.
Skip Nav Destination
4th ISRM Young Scholars Symposium on Rock Mechanics
May 10–13, 2017
Jeju, Korea
ISBN:
979-11-5610-315-8
Deformation and initiation in Fracture Due To Hydro-Shearing and Induced Stress in Enhanced Geothermal System Available to Purchase
Yong Xiao;
Yong Xiao
Southwest Petroleum University, China and University of Utah
Search for other works by this author on:
Mengting Chen;
Mengting Chen
Southwest Petroleum University, China
Search for other works by this author on:
Paper presented at the 4th ISRM Young Scholars Symposium on Rock Mechanics, Jeju, Korea, May 2017.
Paper Number:
ISRM-YSS-2017-092
Published:
May 10 2017
Citation
Xiao, Yong, Guo, Jianchun, Chen, Mengting, and John McLennan. "Deformation and initiation in Fracture Due To Hydro-Shearing and Induced Stress in Enhanced Geothermal System." Paper presented at the 4th ISRM Young Scholars Symposium on Rock Mechanics, Jeju, Korea, May 2017.
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
15
Views
Advertisement
Suggested Reading
Advertisement