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.

Data e Risorse

Campo Valore
DOI 10.15121/1842336
accessLevel public
bureauCode {019:20}
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dataQuality true
identifier https://data.openei.org/submissions/5639
issued 2022-01-27T07:00:00Z
landingPage https://gdr.openei.org/submissions/1362
license https://creativecommons.org/licenses/by/4.0/
modified 2022-01-27T22:03:51Z
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programCode {019:006}
projectLead Zachary Frone
projectNumber EE0009033
projectTitle DEVELOPMENT OF A DIRECTIONAL COOLING INDUCED FRACTURING (DCIF) TECHNOLOGY FOR NEAR-WELLBORE STRESS ESTIMATION IN GEOTHERMAL RESERVOIRS
publisher Lawrence Berkeley National Laboratory
resource-type Dataset
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Gruppi
  • AmeriGEOSS
  • National Provider
  • North America
Tag
  • accoustics
  • acoustic-emission
  • amerigeo
  • amerigeoss
  • biaxial-stress
  • borehole-damage-effect
  • ckan
  • damage-effect-test
  • dcif
  • directional-cooling-induced-fracturing
  • energy
  • failure-test
  • fracture
  • geo
  • geoss
  • geothermal
  • granite
  • microcrack
  • national
  • north-america
  • processed-data
  • raw-data
  • stress
  • test
  • thermal-fracture
  • thermal-stress
  • united-states
  • westerly
  • westerly-granite
isopen True
license_id cc-by
license_title Creative Commons Attribution
license_url http://www.opendefinition.org/licenses/cc-by
maintainer Seiji Nakagawa
maintainer_email snakagawa@lbl.gov
metadata_created 2025-11-20T12:02:31.771361
metadata_modified 2025-11-20T12:02:31.771365
notes 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.
num_resources 13
num_tags 29
title DCIF (Directional Cooling-Induced Fracturing) Westerly Granite AE Borehole Damage Effect Test (Task 3-0)