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Optimisation of borehole-jack fracturing technique for in situ stress measurement
The technology of stress measurement by the borehole jack is a modification of the hydraulic fracturing method aimed at the determination of the stresses in permeable rocks. The standard procedure for the application of this technique is to form fractures by a borehole jack, which is not always possible at great depth due to the high rock pressure. To address these problems, we propose a two-step technique that involves the formation of extended fractures in the isolated interval of the borehole by working fluid and the subsequent determination of the number, orientation, and reopening pressure of fractures by a special directional loading tool. The developed tool has a higher load transfer efficiency on the borehole wall in comparison with existing analogues. The article describes the results of numerical simulations and laboratory tests.
Optimisation of borehole-jack fracturing technique for in situ stress measurement
The technology of stress measurement by the borehole jack is a modification of the hydraulic fracturing method aimed at the determination of the stresses in permeable rocks. The standard procedure for the application of this technique is to form fractures by a borehole jack, which is not always possible at great depth due to the high rock pressure. To address these problems, we propose a two-step technique that involves the formation of extended fractures in the isolated interval of the borehole by working fluid and the subsequent determination of the number, orientation, and reopening pressure of fractures by a special directional loading tool. The developed tool has a higher load transfer efficiency on the borehole wall in comparison with existing analogues. The article describes the results of numerical simulations and laboratory tests.
Optimisation of borehole-jack fracturing technique for in situ stress measurement
Pavlov, Valeriy A. (author) / Serdyukov, Sergey V. (author) / Martynyuk, Petr A. (author) / Patutin, Andrey V. (author)
International Journal of Geotechnical Engineering ; 13 ; 451-457
2019-09-03
7 pages
Article (Journal)
Electronic Resource
English
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