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In-situ stress measurement at 1550-meters depth at the kISMET test site in Lead, S.D

51st US Rock Mechanics / Geomechanics Symposium 2017

Wang, H.F.; Lee, Moo Y.; Doe, T.W.; Haimson, B.C.; Oldenburg, C.M.; Dobson, P.F.

We conducted a series of in situ stress measurements in a 100-meter deep hole (kISMET 003) drilled vertically from the 4850-ft level (1478-meters depth) of the Sanford Underground Research Facility (SURF) located in Lead, South Dakota. We used the method of hydraulic fracturing for in situ stress measurements (Haimson and Cornet, 2003) at total overburden depths between 1520 and 1550 meters The minimum horizontal stress magnitudes were taken to be the shut-in pressures obtained from dP/dt analysis (Lee and Haimson, 1989) of pressurization cycles 3 and 4 in each test. The values ranged between 20.0 and 24.1 MPa (2900 and 3494 psi), and averaged 21.7 MPa (3146 psi). The direction of maximum principal stress was obtained from analysis of an acoustic borehole televiewer log following the hydraulic fracturing. The fractures are striking at an average of N86°E with a dip of 78° to the southeast. The fact that the fractures are not following foliation but have a non-vertical, though very steep, dip indicates that one of the principal stresses may be inclined slightly off vertical.

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TYPE Conference Poster YEAR 2017
ScopusOSTI

Fracture and flow designs for the collab/SIGMA-V project

Transactions - Geothermal Resources Council

Knox, Hunter A.; Fu, P.; Morris, J.P.; Guglielmi, Y.; Vermeul, V.R.; Ajo-Franklin, J.; Strickland, C.E.; Johnson, Timothy; Herrick, Courtney G.; Lee, Moo Y.; Bauer, S.J.; Baumgartner, T.; Blankenship, D.; Bonneville, A.; Boyd, L.; Brown, S.T.; Burghardt, J.A.; Carroll, S.A.; Chen, T.; Condon, C.; Cook, P.J.; Dobson, P.F.; Doe, T.; Doughty, C.A.; Elsworth, D.; Frash, L.P.; Frone, Z.; Ghassemi, A.; Gudmundsdottir, H.; Guthrie, G.; Haimson, B.; Heise, J.; Horn, M.; Horne, R.N.; Hu, M.; Huang, H.; Huang, L.; Johnson, T.C.; Johnston, B.; Karra, S.; Kim, K.; King, D.K.; Kneafsey, T.; Kumar, D.; Li, K.; Maceira, M.; Makedonska, N.; Marone, C.; Mattson, E.; McClure, M.W.; McLennan, J.; McLing, T.; Mellors, R.J.; Metcalfe, E.; Miskimins, J.; Nakagawa, S.; Neupane, G.; Newman, G.; Nieto, A.; Oldenburg, C.M.; Pawar, R.; Petrov, P.; Pietzyk, B.; Podgorney, R.; Polsky, Y.; Porse, S.; Roggenthen, B.; Rutqvist, J.; Santos-Villalobos, H.; Schwering, P.; Sesetty, V.; Singh, A.; Smith, M.M.; Snyder, N.; Sone, H.; Sonnenthal, E.L.; Spycher, N.; Su, J.; Suzuki, A.; Ulrich, C.; Valladao, C.A.; Vandermeer, W.; Vardiman, D.; Wagoner, J.L.; Wang, H.F.; Weers, J.; White, J.; White, M.D.; Winterfeld, P.; Wu, Y.S.; Wu, Y.; Zhang, Y.; Zhang, Y.Q.; Zhou, J.; Zhou, Q.; Zoback, M.D.

The first experiment of the Enhanced Geothermal Systems (EGS) Collab (a.k.a Stimulation Investigations for Geothermal Modeling Analysis and Validation (SIGMA-V)) project is designed to comprehensively monitor a series of hydraulic fracture stimulations and subsequent flow tests. This experiment is planned for the 4850 Level in the Sanford Underground Research Facility (SURF), located at the former Homestake Gold Mine, in Lead, South Dakota. The target host rock for these stimulations and flow tests is a phyllite schist known as the Poorman formation. This paper discusses at a high level the engineering design for the stimulation and fracture monitoring system, the considerations for the test bed construction, and the preliminary stimulation modeling. Furthermore, this paper will highlight the intricate ways that predictive modeling can be used for testbed and stimulation design. This project is funded by the United States Department of Energy, Geothermal Technologies Office (GTO).

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TYPE Conference Poster YEAR 2017
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The State of stress in the Sanford Underground Research Facility (SURF) in Lead South Dakota

Lee, Moo Y.

As a part of the U.S. Department of Energy (DOE) SubTER (Subsurface Technology and Engineering Research, Development and Demonstration) initiative, University of Wisconsin- Madison, Sandia National Laboratories, and Lawrence Berkeley National Laboratory conducted the Permeability (k) and Induced Seismicity Management for Energy Technologies (kISMET) project. The objectives of the project are to define the in situ status of stress in the Sanford Underground Research Facility (SURF) in Lead, South Dakota and to establish the relations between in situ stress and induced fracture through hydraulically stimulating the fracture. (SURF) in Lead, South Dakota. In situ tests are conducted in a 7.6 cm diameter and 100 long vertical borehole located in the 4850 Level West Access Drift near Davies Campus of SURF (Figure 1). The borehole is located in the zone of Precambrian Metamorphic Schist.

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TYPE Other Report YEAR 2016
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Helium-mass-spectrometry-permeameter for the measurement of permeability of low permeability rock with application to triaxial deformation conditions

49th US Rock Mechanics / Geomechanics Symposium 2015

Bauer, Stephen J.; Lee, Moo Y.; Gardner, William P.

A helium leakage detection system was modified to measure gas permeability on extracted cores of nearly impermeable rock. Here we use a Helium - Mass - Spectrometry - Permeameter (HMSP) to conduct a constant pressure, steady state flow test through a sample using helium gas. Under triaxial stress conditions, the HMSP can measure flow and estimate permeability of rocks and geomaterials down to the nanodarcy scale (10-21 m2). In this study, measurements of flow through eight shale samples under hydrostatic conditions were in the range of 10-7 to 10-9 Darcy. We extend this flow measurement technology by dynamically monitoring the release of helium from a helium saturated shale sample during a triaxial deformation experiment. The helium flow, initially extremely low, consistent with the low permeability of shale, is observed to increase in advance of volume strain increase during deformation of the shale. This is perhaps the result of microfracture development and flow path linkage through the microfractures within the shale. Once microfracturing coalescence initiates, there is a large increase in helium release and flow. This flow rate increase is likely the result of development of a macrofracture in the sample, a flow conduit, later confirmed by post-test observations of the deformed sample. The release rate (flow) peaks and then diminishes slightly during subsequent deformation; however the post deformation flow rate is considerably greater than that of undeformed shale.

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TYPE Conference Poster YEAR 2015
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Results 26–50 of 99
Results 26–50 of 99