Paul Schwering

Sandia National Laboratories

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Co-Authors

Hunter Knox

Pacific Northwest National Laboratory

Timothy J. Kneafsey

Lawrence Berkeley National Laboratory

Patrick Dobson

Lawrence Berkeley National Laboratory

Craig Ulrich

Lawrence Berkeley National Laboratory

William Roggenthen

Lawrence Berkeley National Laboratory

Chris Strickland

Pacific Northwest National Laboratory

T. Doe

Geothermal Technologies Office

Ghanashyam Neupane

Center for Advanced Energy Studies

Jeffrey Burghardt

Pacific Northwest National Laboratory

Jonathan Ajo‐Franklin

Rice University

Cooperative Institutions

University of Wisconsin–Madison

127

Lawrence Berkeley National Laboratory

107

Pacific Northwest National Laboratory

Lawrence Livermore National Laboratory

University of California, Berkeley

Stanford University

Sandia National Laboratories

Sandia National Laboratories California

Colorado School of Mines

United States Geological Survey

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Analysis of hydraulic fractures performed on the 4100 level at the Sanford Underground Research Facility.

OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (2019)

Mathew Duffy Ingraham Mathew Duffy Ingraham Mathew Duffy Ingraham Mathew Duffy Ingraham Jeffrey Burghardt

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Design and Fabrication of a Remote-Control Hydraulic Fracturing System.

OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (2021)

Mathew Duffy Ingraham Christopher Strickland Vincent R. Vermeul Benjamin Roberts Jeffrey Burghardt

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Creation of a Mixed‐Mode Fracture Network at Mesoscale Through Hydraulic Fracturing and Shear Stimulation

Journal of Geophysical Research Solid Earth (2020)

Martin Schoenball Jonathan Ajo‐Franklin Doug Blankenship Chengping Chai Aditya Chakravarty

Abstract Enhanced Geothermal Systems could provide a substantial contribution to the global energy demand if their implementation could overcome inherent challenges. Examples are insufficient created permeability, early thermal breakthrough, and unacceptable induced seismicity. Here we report on the seismic response of a mesoscale hydraulic fracturing experiment performed at 1.5‐km depth at the Sanford Underground Research Facility. We have measured the seismic activity by utilizing a 100‐kHz, continuous seismic monitoring system deployed in six 60‐m length monitoring boreholes surrounding the experimental domain in 3‐D. The achieved location uncertainty was on the order of 1 m and limited by the signal‐to‐noise ratio of detected events. These uncertainties were corroborated by detections of fracture intersections at the monitoring boreholes. Three intervals of the dedicated injection borehole were hydraulically stimulated by water injection at pressures up to 33 MPa and flow rates up to 5 L/min. We located 1,933 seismic events during several injection periods. The recorded seismicity delineates a complex fracture network comprised of multistrand hydraulic fractures and shear‐reactivated, preexisting planes of weakness that grew unilaterally from the point of initiation. We find that heterogeneity of stress dictates the seismic outcome of hydraulic stimulations, even when relying on theoretically well‐behaved hydraulic fractures. Once hydraulic fractures intersected boreholes, the boreholes acted as a pressure relief and fracture propagation ceased. In order to create an efficient subsurface heat exchanger, production boreholes should not be drilled before the end of hydraulic stimulations.

Microseism

10.1029/2020jb019807

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Citations (58)

Near-Field Imaging of Shallow Chemical Explosions in Granite Using Change Detection Methods with Surface and Borehole Seismic Data

Charles Hoots Robert Abbott Leiph Preston Hunter Knox Paul Schwering

Explosions detonated in geologic media damage it in various ways via processes that include vaporization, fracturing, crushing of interstitial pores, etc. Seismic waves interact with the altered media in ways that could be important to the discrimination, characterization, and location of the explosions. As part of the Source Physics Experiment, we acquired multiple pre- and post-explosion near-field seismic datasets and analyzed changes to seismic P-wave velocity. Our results indicate that the first explosion detonated in an intact media can cause fracturing and, consequently, a decrease in P-wave velocity. After the first explosion, subsequent detonations in the pre-damaged media have limited discernible effects. We hypothesize this is due to the stress-relief provided by a now pre-existing network of fractures into which gasses produced by the explosion migrate. We also see an overall increase in velocity of the damaged region over time, either due to a slow healing process or closing of the fractures by subsequent explosions.

Seismic velocity

Vaporization

10.2172/1617436

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Citations (3)

Investigations in Stimulating Crystalline Rock: Hypotheses and Uncertainties

AGU Fall Meeting Abstracts (2018)

Timothy J. Kneafsey D. D. Blankenship Patrick Dobson Hunter Knox T. C. Johnson

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SAGEEP 2018 papers with only a paragraph abstract

Symposium on the Application of Geophysics to Engineering and Environmental Problems 2000 (2018)

A. Malehmir Amanda Pasanen Andrea D. Sims Aaron Brownley Aaron Fukuda

Paragraph

10.4133/sageep.31-001

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4D Electrical Resistivity Imaging of Stress Perturbations Induced During High-Pressure Shear Stimulation Tests

Authorea (Authorea) (2024)

T. C. Johnson Jeffrey Burghardt Chris Strickland Dana Sirota Vince R. Vermeul

Fluid flow through fractured media is typically governed by the distribution of fracture apertures, which are in turn governed by stress. Consequently, understanding subsurface stress is critical for understanding and predicting subsurface fluid flow. Although laboratory-scale studies have established a sensitive relationship between effective stress and bulk electrical conductivity in crystalline rock, that relationship has not been extensively leveraged to monitor stress evolution at the field scale using electrical or electromagnetic geophysical monitoring approaches. In this paper we demonstrate the use time-lapse 3-dimensional (4D) electrical resistivity tomography to image perturbations in the stress field generated by pressurized borehole packers deployed during shear-stimulation attempts in a 1.25 km deep metamorphic crystalline rock formation.

Electrical Resistivity Tomography

Stress field

10.22541/essoar.170612540.00733030/v1

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Blue Canyon Dome: Development of a Small-Scale Testbed for Monitoring Underground Explosions

Mathew Duffy Ingraham Hunter Knox Kirsten Chojnicki Joshua David Feldman James Knox

Dome (geology)

Testbed

10.2172/2432264

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Citations (2)