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DCIF (Directional Cooling-Induced Fracturing) Westerly Granite AE Borehole Damage Effect Test (Task 3-0)

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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

Lawrence Berkeley National Laboratory. (2022). DCIF (Directional Cooling-Induced Fracturing) Westerly Granite AE Borehole Damage Effect Test (Task 3-0) [data set]. Retrieved from https://dx.doi.org/10.15121/1842336.
Export Citation to RIS
Nakagawa, Seiji. DCIF (Directional Cooling-Induced Fracturing) Westerly Granite AE Borehole Damage Effect Test (Task 3-0). United States: N.p., 27 Jan, 2022. Web. doi: 10.15121/1842336.
Nakagawa, Seiji. DCIF (Directional Cooling-Induced Fracturing) Westerly Granite AE Borehole Damage Effect Test (Task 3-0). United States. https://dx.doi.org/10.15121/1842336
Nakagawa, Seiji. 2022. "DCIF (Directional Cooling-Induced Fracturing) Westerly Granite AE Borehole Damage Effect Test (Task 3-0)". United States. https://dx.doi.org/10.15121/1842336. https://gdr.openei.org/submissions/1362.
@div{oedi_5639, 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.}, doi = {10.15121/1842336}, url = {https://gdr.openei.org/submissions/1362}, journal = {}, number = , volume = , place = {United States}, year = {2022}, month = {01}}
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

Seiji Nakagawa

Lawrence Berkeley National Laboratory

Research Areas

DOE 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

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