DCIF (Directional Cooling-Induced Fracturing) Westerly Granite AE Borehole Damage Effect Test (Task 3-0)
Directional Cooling-Induced Fracturing (DCIF) experiments were conducted on three rectangular Westerly granite blocks (width=depth=4.0", height=2.0") which were preheated to 200, 400, and 600 degree C to induce damage (microcracks) with varying degrees. Liquid nitrogen was poured in a small, 1"-diameter copper cup attached to the top of the sample, and the resulting acoustic emissions (AEs) and temperature changes on the surface of the sample were monitored. The experiments were conducted under one selected biaxial stress (5.8MPa). The obtained AEs were used to determine the microcracking source locations and amplitude, and the associated moment tensors. The onset time of the AEs was correlated with the cooling temperature, which was used to show that the temperature at the onset of microcracking is not affected significantly by the preexisting damage, compared to the impact of the stress in the sample. Included in this submission are the animations of the AE locations and graphics displaying the measured temperature-AE activity changes for samples with different degrees of microcrack damage.
Citation Formats
TY - DATA
AB - Directional Cooling-Induced Fracturing (DCIF) experiments were conducted on three rectangular Westerly granite blocks (width=depth=4.0", height=2.0") which were preheated to 200, 400, and 600 degree C to induce damage (microcracks) with varying degrees. Liquid nitrogen was poured in a small, 1"-diameter copper cup attached to the top of the sample, and the resulting acoustic emissions (AEs) and temperature changes on the surface of the sample were monitored. The experiments were conducted under one selected biaxial stress (5.8MPa). The obtained AEs were used to determine the microcracking source locations and amplitude, and the associated moment tensors. The onset time of the AEs was correlated with the cooling temperature, which was used to show that the temperature at the onset of microcracking is not affected significantly by the preexisting damage, compared to the impact of the stress in the sample. Included in this submission are the animations of the AE locations and graphics displaying the measured temperature-AE activity changes for samples with different degrees of microcrack damage.
AU - Nakagawa, Seiji
DB - Geothermal Data Repository
DP - Open EI | National Renewable Energy Laboratory
DO - 10.15121/1842336
KW - geothermal
KW - energy
KW - directional cooling induced fracturing
KW - DCIF
KW - Directional Cooling-Induced Fracturing
KW - damage effect test
KW - fracture
KW - microcrack
KW - thermal stress
KW - acoustic emission
KW - accoustics
KW - thermal fracture
KW - failure test
KW - raw data
KW - processed data
KW - stress
KW - biaxial stress
KW - Westerly Granite
KW - Borehole Damage Effect
KW - test
KW - Westerly
KW - Granite
LA - English
DA - 2022/01/27
PY - 2022
PB - Lawrence Berkeley National Laboratory
T1 - DCIF (Directional Cooling-Induced Fracturing) Westerly Granite AE Borehole Damage Effect Test (Task 3-0)
UR - https://doi.org/10.15121/1842336
ER -
Nakagawa, Seiji. DCIF (Directional Cooling-Induced Fracturing) Westerly Granite AE Borehole Damage Effect Test (Task 3-0). Lawrence Berkeley National Laboratory, 27 January, 2022, Geothermal Data Repository. https://doi.org/10.15121/1842336.
Nakagawa, S. (2022). DCIF (Directional Cooling-Induced Fracturing) Westerly Granite AE Borehole Damage Effect Test (Task 3-0). [Data set]. Geothermal Data Repository. Lawrence Berkeley National Laboratory. https://doi.org/10.15121/1842336
Nakagawa, Seiji. DCIF (Directional Cooling-Induced Fracturing) Westerly Granite AE Borehole Damage Effect Test (Task 3-0). Lawrence Berkeley National Laboratory, January, 27, 2022. Distributed by Geothermal Data Repository. https://doi.org/10.15121/1842336
@misc{GDR_Dataset_1362,
title = {DCIF (Directional Cooling-Induced Fracturing) Westerly Granite AE Borehole Damage Effect Test (Task 3-0)},
author = {Nakagawa, Seiji},
abstractNote = {Directional Cooling-Induced Fracturing (DCIF) experiments were conducted on three rectangular Westerly granite blocks (width=depth=4.0", height=2.0") which were preheated to 200, 400, and 600 degree C to induce damage (microcracks) with varying degrees. Liquid nitrogen was poured in a small, 1"-diameter copper cup attached to the top of the sample, and the resulting acoustic emissions (AEs) and temperature changes on the surface of the sample were monitored. The experiments were conducted under one selected biaxial stress (5.8MPa). The obtained AEs were used to determine the microcracking source locations and amplitude, and the associated moment tensors. The onset time of the AEs was correlated with the cooling temperature, which was used to show that the temperature at the onset of microcracking is not affected significantly by the preexisting damage, compared to the impact of the stress in the sample. Included in this submission are the animations of the AE locations and graphics displaying the measured temperature-AE activity changes for samples with different degrees of microcrack damage.},
url = {https://gdr.openei.org/submissions/1362},
year = {2022},
howpublished = {Geothermal Data Repository, Lawrence Berkeley National Laboratory, https://doi.org/10.15121/1842336},
note = {Accessed: 2025-05-05},
doi = {10.15121/1842336}
}
https://dx.doi.org/10.15121/1842336
Details
Data from Jan 27, 2022
Last updated Jan 27, 2022
Submitted Jan 27, 2022
Organization
Lawrence Berkeley National Laboratory
Contact
Seiji Nakagawa
510.486.7894
Authors
Keywords
geothermal, energy, directional cooling induced fracturing, DCIF, Directional Cooling-Induced Fracturing, damage effect test, fracture, microcrack, thermal stress, acoustic emission, accoustics, thermal fracture, failure test, raw data, processed data, stress, biaxial stress, Westerly Granite, Borehole Damage Effect, test, Westerly, GraniteDOE Project Details
Project Name DEVELOPMENT OF A DIRECTIONAL COOLING INDUCED FRACTURING (DCIF) TECHNOLOGY FOR NEAR-WELLBORE STRESS ESTIMATION IN GEOTHERMAL RESERVOIRS
Project Lead Zachary Frone
Project Number EE0009033