scholarly journals Seismic Response to Injection Well Stimulation in a High‐Temperature, High‐Permeability Reservoir

2019 ◽  
Vol 20 (6) ◽  
pp. 2848-2871 ◽  
Author(s):  
Chet Hopp ◽  
Steven Sewell ◽  
Stefan Mroczek ◽  
Martha Savage ◽  
John Townend
Keyword(s):  
High Temperature ◽  
Seismic Response ◽  
Injection Well ◽  
High Permeability ◽  
Well Stimulation

scholarly journals Seismic Response to Injection Well Stimulation in a High-Temperature, High-Permeability Reservoir

2021 ◽  
Author(s):  
C Hopp ◽  
Steven Sewell ◽  
S Mroczek ◽  
Martha Savage ◽  
John Townend
Keyword(s):  
High Temperature ◽  
Compressive Stress ◽  
Flow Rate ◽  
Matched Filter ◽  
Taupo Volcanic Zone ◽  
Valuable Insight ◽  
High Permeability ◽  
Injection Flow Rate ◽  
Well Stimulation ◽  
Injection Flow

©2019. American Geophysical Union. All Rights Reserved. Fluid injection into the Earth's crust can induce seismic events that cause damage to local infrastructure but also offer valuable insight into seismogenesis. The factors that influence the magnitude, location, and number of induced events remain poorly understood but include injection flow rate and pressure as well as reservoir temperature and permeability. The relationship between injection parameters and injection-induced seismicity in high-temperature, high-permeability reservoirs has not been extensively studied. Here we focus on the Ngatamariki geothermal field in the central Taupō Volcanic Zone, New Zealand, where three stimulation/injection tests have occurred since 2012. We present a catalog of seismicity from 2012 to 2015 created using a matched-filter detection technique. We analyze the stress state in the reservoir during the injection tests from first motion-derived focal mechanisms, yielding an average direction of maximum horizontal compressive stress (SHmax) consistent with the regional NE-SW trend. However, there is significant variation in the direction of maximum compressive stress (σ1), which may reflect geological differences between wells. We use the ratio of injection flow rate to overpressure, referred to as injectivity index, as a proxy for near-well permeability and compare changes in injectivity index to spatiotemporal characteristics of seismicity accompanying each test. Observed increases in injectivity index are generally poorly correlated with seismicity, suggesting that the locations of microearthquakes are not coincident with the zone of stimulation (i.e., increased permeability). Our findings augment a growing body of work suggesting that aseismic opening or slip, rather than seismic shear, is the active process driving well stimulation in many environments.

scholarly journals Seismic Response to Injection Well Stimulation in a High-Temperature, High-Permeability Reservoir

2021 ◽  
Author(s):  
C Hopp ◽  
Steven Sewell ◽  
S Mroczek ◽  
Martha Savage ◽  
John Townend
Keyword(s):  
High Temperature ◽  
Compressive Stress ◽  
Flow Rate ◽  
Matched Filter ◽  
Taupo Volcanic Zone ◽  
Valuable Insight ◽  
High Permeability ◽  
Injection Flow Rate ◽  
Well Stimulation ◽  
Injection Flow

©2019. American Geophysical Union. All Rights Reserved. Fluid injection into the Earth's crust can induce seismic events that cause damage to local infrastructure but also offer valuable insight into seismogenesis. The factors that influence the magnitude, location, and number of induced events remain poorly understood but include injection flow rate and pressure as well as reservoir temperature and permeability. The relationship between injection parameters and injection-induced seismicity in high-temperature, high-permeability reservoirs has not been extensively studied. Here we focus on the Ngatamariki geothermal field in the central Taupō Volcanic Zone, New Zealand, where three stimulation/injection tests have occurred since 2012. We present a catalog of seismicity from 2012 to 2015 created using a matched-filter detection technique. We analyze the stress state in the reservoir during the injection tests from first motion-derived focal mechanisms, yielding an average direction of maximum horizontal compressive stress (SHmax) consistent with the regional NE-SW trend. However, there is significant variation in the direction of maximum compressive stress (σ1), which may reflect geological differences between wells. We use the ratio of injection flow rate to overpressure, referred to as injectivity index, as a proxy for near-well permeability and compare changes in injectivity index to spatiotemporal characteristics of seismicity accompanying each test. Observed increases in injectivity index are generally poorly correlated with seismicity, suggesting that the locations of microearthquakes are not coincident with the zone of stimulation (i.e., increased permeability). Our findings augment a growing body of work suggesting that aseismic opening or slip, rather than seismic shear, is the active process driving well stimulation in many environments.

Emerging High Temperature Well Stimulation Diversion Technology Leads to Significant Increases in Conductivity

2017 ◽  
Author(s):  
Naima Bestaoui-Spurr ◽  
Dorianne Castillo ◽  
Frances Debenedictis ◽  
Harold Brannon
Keyword(s):  
High Temperature ◽  
Well Stimulation

Development of high-temperature high-permeability MnZn power ferrites for MHz application by Nb2O5 and TiO2 co-doping

2020 ◽  
Vol 46 (7) ◽  
pp. 8935-8941 ◽  
Author(s):  
Shengbo Yi ◽  
Guohua Bai ◽  
Xiaoyu Wang ◽  
Xuefeng Zhang ◽  
Akhlaq Hussain ◽  
...  
Keyword(s):  
High Temperature ◽  
High Permeability ◽  
Co Doping

Confirmation of Seismic Integrity of HTTR Against 2011 Great East Japan Earthquake

2016 ◽  
Author(s):  
Masato Ono ◽  
Kazuhiko Iigaki ◽  
Yosuke Shimazaki ◽  
Atsushi Shimizu ◽  
Hiroyuki Inoi ◽  
...  
Keyword(s):  
High Temperature ◽  
Seismic Response ◽  
Seismic Analysis ◽  
Evaluation Criteria ◽  
Reactor Power ◽  
Great East Japan Earthquake ◽  
Great Earthquake ◽  
Response Analysis ◽  
Seismic Response Analysis ◽  
Energy Agency

Japan Atomic Energy Agency (JAEA) has carried out research and development to establish the technical basis of High Temperature Gas-cooled Reactor (HTGR) by using High Temperature engineering Test Reactor (HTTR). On March 11th, 2011, the Great East Japan Earthquake of magnitude 9.0 occurred. When the great earthquake occurred, the HTTR had been stopped under the periodic inspection and maintenance of equipment and instrument. In the great earthquake, the maximum seismic acceleration observed at the HTTR exceeded the maximum value in seismic design. The visual inspection of HTTR facility was carried out for the seismic integrity conformation of HTTR. The seismic analysis was also carried out using the observed earthquake motion at HTTR site to confirm the integrity of HTTR. The concept of comprehensive integrity evaluation for the HTTR facility is divided into two parts. One is the “inspection of equipment and instrument”. The other is the “seismic response analysis” for the building structure, equipment and instrument using the observed earthquake. For the basic inspections of equipment and instrument were performed for all them related to the operation of reactor. The integrity of the facilities is confirmed by comparing the inspection results or the numerical results with their evaluation criteria. As the result of inspection of equipment and instrument and seismic response analysis, it was judged that there was no problem to operate the reactor, because there was no damage and performance deterioration, which affects the reactor operation. The integrity of HTTR was also supported by the several operations without reactor power in cold conditions of HTTR in 2011, 2013 and 2015.

Seismic Response of the High-Temperature Engineering Test Reactor Core Bottom Structure

1992 ◽  
Vol 99 (2) ◽  
pp. 169-176 ◽  
Author(s):  
Tatsuo Iyoku ◽  
Yoshiyuki Inagaki ◽  
Shusaku Shiozawa ◽  
Masatoshi Futakawa ◽  
Toshiyo Miki
Keyword(s):  
High Temperature ◽  
Seismic Response ◽  
Reactor Core ◽  
Test Reactor

Evaluation of Injection Well Stimulation as Applied to a Large Micellar/Polymer Project

1980 ◽  
Vol 32 (05) ◽  
pp. 777-784
Author(s):  
James C. Howell ◽  
Bruce D. Thomas
Keyword(s):  
Injection Well ◽  
Well Stimulation

Underground oil‐shale retort monitoring using geotomography

Geophysics ◽  
1984 ◽  
Vol 49 (10) ◽  
pp. 1701-1707 ◽  
Author(s):  
William Daily
Keyword(s):  
High Temperature ◽  
Cross Section ◽  
Spatial Resolution ◽  
Diagnostic Tool ◽  
Oil Shale ◽  
Temporal Development ◽  
High Permeability ◽  
Temperature Zone ◽  
High Temperature Zone

Geophysical tomographs (geotomographs) were made of two underground oil‐shale retorts: (1) the Occidental Oil Shale Inc. miniretort constructed for ignition tests at the demonstration mine at Logan Wash, Colorado; and (2) the Geokinetics Oil Shale Inc. Retort 25 near Vernal, Utah. These experiments demonstrate that geotomography may be a valuable diagnostic tool for underground oil‐shale retorting processes. At the Geokinetics in‐situ retort, the technique delineated the zones of high permeability in a cross‐section of the retort. At the Occidental modified in‐situ miniretort, the technique imaged the high temperature zone of the retort with a spatial resolution of about 2 m, and showed its temporal development over a period of eleven days.

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