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Stanford Geothermal Program (quarterly technical progress reports, July--September 1990 and October--December 1990)

Description: For the summer quarter, progress is summarized and data are presented on the following: well test analysis of finite-conductivity fractures, theoretical investigation of adsorption phenomena, and optimization of reinjection strategy. For the fall quarter, activity focused on the adsorption and well testing projects. A new project investigating reinjection at the Geysers was initiated. (MHR)
Date: February 18, 1991
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Hulin Geopressure-geothermal test well: First order levels

Description: The purpose of this survey was to level through and establish elevations for existing benchmarks along LA Highway No. 685 from Erath, Louisiana south to the well site. The leveling was performed in April 1991, and was accomplished using procedures and equipment identical to that used by the National Geodetic Survey for First Order Class I Leveling. The leveling began on benchmark NGS T-361 located in Erath, Louisiana and the published elevation of 5.271 feet was used for this survey. On this su… more
Date: April 1, 1991
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Quality control of chemical and isotopic analyses of geothermal water samples

Description: Chemical and isotopic analyses of geothermal water samples must meet certain levels of accuracy and reliability to be useful for identifying geochemical processes in hydrothermal systems. Quality control is largely a concern for the analytical laboratory, but the geochemist or reservoir engineer using the chemical data must also be concerned with analytical quality. To test accuracy and reliability of analyses available from laboratories, splits of seven water samples were sent to four stable-i… more
Date: 1991
Creator: Reed, Marshall J. & Mariner, Robert H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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One-dimensional steam flow in porous media under desorption

Description: Performance forecasting for a hypothetical field with Geysers greywacke rock is performed to demonstrate the importance of desorption effect, the actual adsorption isotherm was found to be well approximated by the Langmuir equation. Results obtained suggest that adsorption is the dominant mechanism for steam in geothermal reservoirs.
Date: January 1, 1991
Creator: Nghiem, Cuong Phu & Ramey, Henry J., Jr.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Analysis of preliminary testing of Willis Hulin Well No. 1 (Draft)

Description: The U.S. Department of Energy (DOE) has both drilled and tested four deep research wells in the Texas-Louisiana Gulf Coast region as part of its program to define the magnitude and recoverability of the geopressured-geothermal energy resource. DOE also took over nine wells from industry (before being abandoned) and tested them for short periods to determine fluid properties. The Willis Hulin Well No. 1, located about 7.5 miles south of the town of Erath, Louisiana, is the first well taken over … more
Date: September 1, 1991
Creator: Riney, T. D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Geochemical characteristics of acid fluids in Mt Pinatubo, Philipines

Description: The surface geochemical characteristics of Mt Pinatubo indicate widespread deep acid fluids as shown by the following: presence of solfataras or sulfur-depositing fumaroles near or at the summit, and recent or active volcanism; discharge of mixed fluids with significant chloride at middle elevations; significant amounts of sulfate found in spring discharges at almost all levels (except at lowest levels or near sea level); springs with neutral pH and have high amounts of chloride and significant… more
Date: January 1, 1991
Creator: Buenviaje, Marinela M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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The economics of heat mining: An analysis of design options and performance requirements of hot dry rock (HDR) geothermal power systems

Description: A generalized economic model was developed to predict the breakeven price of HDR generated electricity. Important parameters include: (1) resource quality--average geothermal gradient ({sup o}C/km) and well depth, (2) reservoir performance--effective productivity, flow impedance, and lifetime (thermal drawdown rate), (3) cost components--drilling, reservoir formation, and power plant costs and (4) economic factors--discount and interest rates, taxes, etc. Detailed cost correlations based on his… more
Date: January 25, 1991
Creator: Tester, Jefferson W. & Herzog, Howard J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Comparison of thermal cooldown estimates in the Russkie Komarovtsy petrogeothermal reservoir

Description: A comparison of several models to estimate the rate of thermal cooldown in artificial circulation geothermal reservoirs was made for the Russkie Komarovtsy fracture-stimulated reservoir, which will be located near the town of Uzhgorod in the Zakarpate region of the Ukraine SSR. The economic viability of this moderate-temperature resource depends on sustained flow above the minimum abandonment temperature for a period sufficient to recover investment and operating costs. The rate of heat extract… more
Date: January 1991
Creator: Kruger, Paul; Dyadkin, Yuri; Gendler, Semon; Artemieva, Elena & Smirnova, Nina
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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A review of the UK Geothermal Hot Dry Rock R&D Programme

Description: The UK Department of Energy's Geothermal Hot Dry Rock (HDR) Program was last reviewed in 1987/88, when a number of technical problems were identified. These related to the size of reservoir (heat exchanger), its thermal behavior (short circuits) and water losses. A program of work to address these problems was subsequently set up. This work has recently been reviewed. The main conclusions are: (1) a satisfactory procedure for creating a commercial-scale HDR reservoir has yet to be demonstrated;… more
Date: January 1, 1991
Creator: Symons, Geoff D. & Clarke, John H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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A preliminary assessment of a medium-enthalpy geothermal resource in Nagu (Tibet) people's republic of China

Description: The Nagqu geothermal field is a single-phase, liquid-dominated system at reservoir conditions, having a high gas content. This field is located at an elevation of about 4,500 m (asl), in the vicinity of the City of Nagqu, which is one of the most important cities of Tibet.The reservoir rock is made of a highly fractured, low-permeability sedimentary sequence. During the implementation of the study described in this paper, fluid production was mainly obtained from two out of four possible produc… more
Date: January 1, 1991
Creator: Battistelli, A.; Rivera, R.J.; D'Amore, F.; Wu, F.; Rossi, R. & Luzi, .
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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A coupled model of fluid flow in jointed rock

Description: We present a fully coupled model of fluid flow in jointed rock, where the fluid flow depends on the joint openings and the joint openings depend on the fluid pressure. The joints and rock blocks are modeled discretely using the finite element method. Solutions for the fluid and rock are obtained and iteration is performed until both solutions converge. Example applications include an examination of the effects of back-pressure on flow in a geothermal reservoir and transient fluid injection into… more
Date: January 1, 1991
Creator: Swenson, Daniel; Martineau, Rick; James, Mark & Brown, Don
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Geysering discharge of a geothermal wellbore at Zunil, Guatemala

Description: Within two hours after discharge began, for a production test in 1989 of well ZCQ-4, pressure variations changed from approximately sinusoidal to a cycle of sudden and complex peak discharge pressures, to 9 bar, separated by irregular pressure declines to 5 bar. Initial cycle periods of 42 minutes evolved to 150 minutes by day 20 of continuous testing, when three of four surge peaks were well separated. Chemical signatures of fluids discharged with pressure surges were distinctive. When combine… more
Date: January 1, 1991
Creator: Michels, Donald E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Hydrochemical features of a geothermal test well iin a volcanic caldera, MT. Pinatubo, Philippines

Description: Mt. Pinatubo is one of several recent-age volcanoes along the west Luzon volcanic arc. A fumarole near the suminit emits gases with magmatic characteristics. Several thermal springs on the east and west flanks yield various fluid typos, including neutral chloride and bicarbonate. Three wellbores probed the Mt. Pinatubo caldera from elevations of +1230 through -1600 mRSL. Trajectories may be described as: central, crossing a boundary wall from the inside, and skirting a wall [probably] on the in… more
Date: January 1, 1991
Creator: Michels, D. E.; Clemente, V. C. & Ramos, M. N.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Summary of environmental investigation of a closed reserve pit located within the pleasant bayou geopressured/geothermal lease

Description: This investigation consisted of collecting 24 soil samples, 12 from a depth of 5 inches and 12 from 6 feet, and analyzing each one for 9 heavy metals, plus Hexavalent Chromium, 5 anions, and 4 cations. These tests were conducted to establish the composition of the soil from within the pit (samples, test no.1 thru 10) and from two sites outside the pit area (control no.1 and 2). The results would determine whether the pit closure continued to satisfy federal, state and/or local regulations, or w… more
Date: November 18, 1991
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Simulating a challenging water dominated geothermal system: The Cerro Prieto field, Baja California, Mexico

Description: A three dimensional, multiphase, numerical simulation model of the Cerro Prieto field was developed and used to verify that the present installed capacity (620 MW) can be sustained for 30 years and to evaluate the impact of an 80 MW addition to the installed capacity in the NE-E of the field on the present production areas. Cerro Prieto is the largest known water-dominated geothermal reservoir in the world, with more than 175 wells drilled to date and 17 years of production history. Wells here … more
Date: January 1, 1991
Creator: Antunez, E.U.; Menzies, A.J. & Sanyal, S.K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Heat deliverability of homogeneous geothermal reservoirs

Description: For the last two decades, the petroleum industry has been successfully using simple inflow performance relationships (IPR's) to predict oil deliverability. In contrast, the geothermal industry lacked a simple and reliable method to estimate geothermal wells' heat deliverability. To address this gap in the standard geothermal-reservoir-assessment arsenal, we developed generalized dimensionless geothermal inflow performance relationships (GIPR's). These ''reference curves'' may be regarded as an … more
Date: January 1, 1991
Creator: Iglesias, Eduardo R. & Moya, Sara L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Numerical Modeling of the Initial State and Matching of Well Test Data From the Zunil Geothermal Field, Guatemala

Description: A significant amount of geoscientific and reservoir engineering data have been collected from the Zunil geothermal field since 1973. The data have been used to define a conceptual model for the field which has formed the basis for the construction of a three dimensional numerical simulation model. The numerical model has successfully matched both the initial state of the reservoir, as indicated by subsurface temperature and pressure distributions within the presently drilled area, and available… more
Date: January 1, 1991
Creator: Menzies, A. J.; Granados, E. E.; Sanyal, S. K.; Merida-I, L. & Caicedo-A, A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Modifications to tough and analysis of build-up data of PTS (Pressure/Temperature/Spinner) logging in a two-phase condition

Description: The original version of TOUGH (Pruess, 1987) requires a large amount of CPU time for large 2D or 3D problems. This has prevented us from using the original TOUGH on several actual field simulations. Therefore, we have modified the original TOUGH to make less CPU time and allow us to use new TOUGH on large problems. For reducing the CPU time, two new matrix inversion methods were implemented on the original TOUGH. In this report, first we summarize new matrix inversion method implemented in new … more
Date: January 1, 1991
Creator: Okabe, T.; Osato, K. & Takasugi, S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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The origin of high-temperature zones in vapor-dominated geothermal systems

Description: Vapor-dominated geothermal systems are proposed to originate by downward extension (by the ''heat pipe'' mechanism) into hot dry fractured rock above a large cooling igneous intrusion. High temperature zones found by drilling are shallow parts of the original hot dry rock where the penetration of the vapor reservoir was limited, and hot dry rock may extend under much of these reservoirs. An earlier hot water geothermal system may have formed during an early phase of the heating episode.
Date: January 1, 1991
Creator: Truesdell, Alfred H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Reservoir engineering studies of small low-temperature hydrothermal systems in Iceland

Description: Geothermal energy provides more than one third of the energy consumed in Iceland. Its primary use is for space heating and most of the 28 public hitaveitur (district heating services) in Iceland utilize small low-temperature geothermal fields that have a natural heat output of only a few 100 kW{sub t} to a few MW{sub t}. All of these small reservoirs respond to production by declining pressure and some by declining temperature. During the 1980's the emphasis in geothermal research in Iceland sh… more
Date: January 1, 1991
Creator: Axelsson, Gudni
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Simulating wellflow of high-nonocondensable-gas geofluids using laboratory measurements on secondary fluids

Description: An experimental simulation of an actual steam-water geothermal well based on field data obtained in New Zealand is carried out in a two-phase flow facility using dichlorotetrafluoroethane, known commercially as refrigerant 114. The simulation of steam-water flow is accomplished by a similarity theory which is achieved by using appropriate dimensionless numbers; namely, the Mach, Froude, and Reynolds numbers at the flashing front. The theory is used to scale the flow properties from that of wate… more
Date: January 1, 1991
Creator: Laoulache, R.N. & Dipippo, R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Independent Technical Investigation of the Puna Geothermal Venture Unplanned Steam Release, June 12 and 13, 1991, Puna, Hawaii

Description: On June 24, 1991, a third-party investigation team consisting of Richard P. Thomas, Duey E. Milner, James L. Moore, and Dick Whiting began an investigation into the blowout of well KS-8, which occurred at the Puna Geothermal Venture (PGV) site on June 12, 1991, and caused the unabated release of steam for a period of 31 hours before PGV succeeded in closing in the well. The scope of the investigation was to: (a) determine the cause(s) of the incident; (b) evaluate the adequacy of PGVs drilling … more
Date: July 1, 1991
Creator: Thomas, Richard; Whiting, Dick; Moore, James & Milner, Duey
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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An inventory survey at the site of the proposed Kilauea Middle East Rift Zone (KMERZ), Well Site No. 2

Description: At the request of True Mid Pacific Geothermal, Archaeological Consultants of Hawaii, Inc. has conducted an inventory survey at the site of the proposed Kilauea Middle East Rift Zone (KMERZ), Well Site No.2, TMK: 1-2-10:3. The Principal Investigator was Joseph Kennedy M.A., assisted by Jacob Kaio, Field Supervisor and field crew Mark Borrello B.A., Michael O'Shaughnessy B.A., and Randy Adric. This report supercedes all previous reports submitted to the Historic Presentation Section of the Depart… more
Date: March 1, 1991
Creator: Kennedy, Joseph
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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A Status Report of Hawaiian Hawk Nesting Activities at The Proposed Well Site No. 2

Description: On August 11, 1990 during an ornithological survey at the True/Mid Pacific Geothermal Venture proposed well site No.2, a Hawaiian hawk (Buteo solitarius) nest with a nestling was found approximately 430 feet from the proposed well pad clearing. The US Fish and Wildlife Service and the State of Hawaii have listed the Hawaiian hawk as an endangered species. Future development in this area could be impacted by the presence of this endangered avian species and its nest in such close proximity to th… more
Date: May 10, 1991
Creator: Jeffrey, Jack
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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