Effect of natural fractures on determining closure pressure
Abstract
Abstract In Utah FORGE reservoir, eight pressure transient tests (microhydraulic fracturing and DFIT™) show natural fracture/pressure-dependent leakoff. This behavior may lead to misinterpretation of the closure pressure (proxy for minimum principal stress). The closure pressures obtained from DFIT™ (or microhydraulic fracturing) testing may reflect shear failure along natural fractures or discontinuities rather than tensile failure and lead to inaccurate estimates of the minimum principal stress. In pressure tests conducted at the Utah FORGE site showed that reactivation or opening of natural fractures intersecting the wellbore and were suggested by multiple closure events in DFIT™ tests. In addition, comparisons between the pre- and post-well-tests FMI logs show that there are populations of induced fracture and reactivated natural fractures which are mostly vertical and sub-vertical. In this study, DFIT™ (or microhydraulic fracturing) test analysis and numerical simulations were used to suggest that hydraulic shearing of critically stressed natural fractures can contribute to multiple closure signatures and possibly lead to incorrect determination of the minimum principal stress. As other authors have previously advocated, the DFIT™ test analyses and numerical simulations suggest that better estimations of minimum principal stress may be derived by injecting at relatively high rate and pressure and insuring that tensilemore »
- Authors:
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1619408
- Grant/Contract Number:
- EE0007080
- Resource Type:
- Published Article
- Journal Name:
- Journal of Petroleum Exploration and Production Technology
- Additional Journal Information:
- Journal Name: Journal of Petroleum Exploration and Production Technology Journal Volume: 10 Journal Issue: 2; Journal ID: ISSN 2190-0558
- Publisher:
- Springer Science + Business Media
- Country of Publication:
- Switzerland
- Language:
- English
Citation Formats
Nadimi, S., Forbes, B., Moore, J., and McLennan, J. D. Effect of natural fractures on determining closure pressure. Switzerland: N. p., 2019.
Web. doi:10.1007/s13202-019-00769-4.
Nadimi, S., Forbes, B., Moore, J., & McLennan, J. D. Effect of natural fractures on determining closure pressure. Switzerland. https://doi.org/10.1007/s13202-019-00769-4
Nadimi, S., Forbes, B., Moore, J., and McLennan, J. D. Wed .
"Effect of natural fractures on determining closure pressure". Switzerland. https://doi.org/10.1007/s13202-019-00769-4.
@article{osti_1619408,
title = {Effect of natural fractures on determining closure pressure},
author = {Nadimi, S. and Forbes, B. and Moore, J. and McLennan, J. D.},
abstractNote = {Abstract In Utah FORGE reservoir, eight pressure transient tests (microhydraulic fracturing and DFIT™) show natural fracture/pressure-dependent leakoff. This behavior may lead to misinterpretation of the closure pressure (proxy for minimum principal stress). The closure pressures obtained from DFIT™ (or microhydraulic fracturing) testing may reflect shear failure along natural fractures or discontinuities rather than tensile failure and lead to inaccurate estimates of the minimum principal stress. In pressure tests conducted at the Utah FORGE site showed that reactivation or opening of natural fractures intersecting the wellbore and were suggested by multiple closure events in DFIT™ tests. In addition, comparisons between the pre- and post-well-tests FMI logs show that there are populations of induced fracture and reactivated natural fractures which are mostly vertical and sub-vertical. In this study, DFIT™ (or microhydraulic fracturing) test analysis and numerical simulations were used to suggest that hydraulic shearing of critically stressed natural fractures can contribute to multiple closure signatures and possibly lead to incorrect determination of the minimum principal stress. As other authors have previously advocated, the DFIT™ test analyses and numerical simulations suggest that better estimations of minimum principal stress may be derived by injecting at relatively high rate and pressure and insuring that tensile breakdown is reached. In addition, extended shut-in period is required to determine accurate reservoir characteristics and fluid flow regime.},
doi = {10.1007/s13202-019-00769-4},
journal = {Journal of Petroleum Exploration and Production Technology},
number = 2,
volume = 10,
place = {Switzerland},
year = {2019},
month = {8}
}
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