Two 0.3 m × 0.3 m × 0.3 m cubic blocks of shale and coal were used for hydraulic fracturing experiments under true tri-axial stress conditions. The shale block used was highly homogeneous and without visible fractures, while the coal block contained a host of natural fractures. The mechanical and hydraulic properties of both rocks were characterized through multi-stage triaxial tests, Brazilian disk tests, and porosity and permeability measurements. A true tri-axial rock testing machine equipped with loading, pump and acoustic systems was used in the experiment. The acoustic system uses 48 transducers with active sources to repetitively generate and receive ultrasonic P/S wave pulses to reveal fracture initiation and growth. Before the experiment, initial seismic response of both blocks was recorded under hydrostatic stress conditions to characterize anisotropy and heterogeneity of the blocks as reference. Silicon oil was injected centrally into both blocks to create a hydrofracture under deviatoric stress conditions and the load, displacement, pump pressure and volume, and seismic response during the injection process were recorded. Results from two blocks are being compared in terms of hydrofracture geometry and seismic features.
Skip Nav Destination
The Effect of Natural Fracture Heterogeneity on Hydraulic Fracture Performance and Seismic Response in Shale and Coal Formations
A. Barnhoorn
A. Barnhoorn
Delft University of Technology
Search for other works by this author on:
Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, Seattle, Washington, June 2018.
Paper Number:
ARMA-2018-277
Published:
June 17 2018
Citation
Yildirim, B., Cao, W., Durucan, S., Korre, A., Wolf, K. H., Bakker, R., and A. Barnhoorn. "The Effect of Natural Fracture Heterogeneity on Hydraulic Fracture Performance and Seismic Response in Shale and Coal Formations." Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, Seattle, Washington, June 2018.
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.
Pay-Per-View Access
$20.00
Advertisement
22
Views
0
Citations
Advertisement
Suggested Reading
Advertisement