56 Matching Results

Search Results

Results: 1 - 24 next
captions transcript

[News Clip: Sikes/Cerelli]

Description: Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date: January 20, 1994, 6:00 p.m.
Duration: 2 minutes 05 seconds
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Item Type: Refine your search to only Video
Partner: UNT Libraries Special Collections
captions transcript

[News Clip: San Francisco]

Description: Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date: January 20, 1994, 10:00 p.m.
Duration: 1 minute 48 seconds
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Item Type: Refine your search to only Video
Partner: UNT Libraries Special Collections
open access

Heat transfer studies of waste repository design. Progress report, [October 1, 1993--December 31, 1993]

Description: A study of the phase change phenomena in porous media using Christiansen filters continues in order to determine the experimental conditions most favorable to the use of this method. A calibration setup has been finished. Determination of the wavelength corresponding to the equality of the refractive indices varies with temperature is going to be carried out later. The dispersion curves of the solid and liquid phases constituting a transparent saturated porous medium generally have different sl… more
Date: January 20, 1994
Creator: Boehm, R. F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Robotic weld overlay coatings for erosion control. Quarterly progress report, October 1993--December 1993

Description: Research is being conducted to develop criteria for selecting weld overlay coatings for erosion mitigation in Circulated Fluidized Beds. Twelve weld overlay alloys were deposited on 1018 steel substrates using plasma arc welding. Ten samples from each coating were prepared for erosion testing. All selected coatings were erosion tested at 400C and their erosion resistance and microstructure evaluated. Steady state erosion rates were similar for several weld overlay coatings (Ultimet, Inconel-625… more
Date: January 20, 1994
Creator: Levin, B. F.; DuPont, J. N. & Marder, A. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Decontamination and decommissioning of Plant 7 at the Fernald Facility

Description: The Fernald Environmental Management Project (FEMP), formerly the Feed Materials Production Center (FMPC), is a Department of Energy (DOE) site which produced high-quality uranium for military defense beginning in 1951. Production at the FEMP was halted in July 1989. Later that year, the facility was placed on the National Priorities List (NPL). The DOE is currently conducting a Remedial Investigation/Feasibility Study (RI/FS) and other response actions under the Amended Consent Agreement betwe… more
Date: January 20, 1994
Creator: Motl, G. P. & Borgman, T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

A study of production/injection data from slim holes and large-diameter production wells at the Oguni Geothermal Field, JP

Description: Production and injection data from 11 slim holes and 10 large-diameter wells at the Oguni Geothermal Field, Japan, were examined in an effort to establish relationships (1) between productivity of large-diameter wells and slim holes, (2) between injectivity and productivity indices and (3) between productivity index and borehole diameter. The production data from Oguni boreholes imply that the mass production from large diameter wells may be estimated based on data from slim holes. Test data fr… more
Date: January 20, 1994
Creator: Garg, S. K.; Combs, Jim & Abe, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Estimating of equilibrium formation temperature by curve fitting method and it's problems

Description: Determination of true formation temperature from measured bottom hole temperature is important for geothermal reservoir evaluation after completion of well drilling. For estimation of equilibrium formation temperature, we studied non-linear least squares fitting method adapting the Middleton Model (Chiba et al., 1988). It was pointed out that this method was applicable as simple and relatively reliable method for estimation of the equilibrium formation temperature after drilling. As a next step… more
Date: January 20, 1994
Creator: Takai, Kenso; Hyodo, Masami & Takasugi, Shinji
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

The effects of adsorption on injection into geothermal reservoirs

Description: The effects of an adsorbing phase on the injection of liquid and eventual production of vapor from a low-porosity, vapor dominated geothermal reservoir was studied. The magnitude of delay caused by adsorption, diffusion partitioning, preferential partitioning, and permeability variation were compared. Results were then compared to measured tracer production data at the Geysers to determine the most likely delay mechanism for injected tracer at the Geysers. A one-dimensional numerical model desc… more
Date: January 20, 1994
Creator: Hornbrook, John W. & Horne, Roland N.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Summary of recent flow testing of the Fenton Hill HDR Reservoir

Description: Through May of 1993, a sequence of reservoir flow tests has been conducted at our Fenton Hill Hot Dry Rock (HDR) test site as part of the Long-Term Flow Testing (LTFT) program. This testing, which extended over an aggregate period of about 8 months, has demonstrated several significant features concerning HDR reservoirs that taken together reflect very positively on the future development of the HDR concept into a viable commercial reality. Of most significance is the demonstrated self-regulati… more
Date: January 20, 1994
Creator: Brown, Donald W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Characterization of subsurface fracture patterns in the Coso geothermal reservoir by analyzing shear-wave splitting of microearthquake seismorgrams

Description: A large number of microearthquake seismograms have been recorded by a downhole, three-component seismic network deployed around the Coso, California geothermal reservoir. Shear-wave splitting induced by the alignment of cracks in the reservoir has been widely observed in the recordings. Over 100 events with body wave magnitude greater than 1.0 from microearthquakes recorded since March of 1992. have been processed. The results show that most events with paths within the critical angle that defi… more
Date: January 20, 1994
Creator: Lou, Min & Rial, Jose A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Measurement of surface area and water adsorption capacity of The Geysers rocks

Description: The measurement of the quantity of adsorbed water on geothermal reservoir rocks allows a more realistic estimation of reserves for vapor-dominated geothermal reservoirs. This study measured adsorptioddesorption isotherms of water vapor on rock samples from Calpine Co.'s well MLM-3, both core fragments and well cuttings from Coldwater Creek steamfield and a number of well cuttings from well Prati State 12, Northwest Geysers steam field. Surface areas of these rock samples were measured using nit… more
Date: January 20, 1994
Creator: Shang, Shubo; Horne, Roland N. & Ramey, Henry J. Jr.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Prospects for Universal Heat Mining: from a Jules Verne vision to a 21st century reality

Description: The extraction of heat or thermal energy from the Earth -- heat mining -- has the potential to play a major role as an energy supply technology for the 21st century. However, even if reservoir stimulation goals are achieved, the role of heat mining with today's energy prices and development costs is limited to only a small fraction of the earth's surface, specifically to geologically active regions where geothermal gradients are high. This paper examines the prospects for universal heat mining … more
Date: January 20, 1994
Creator: Tester, J. W.; Herzog, H. J.; Chen, Z.; Potter, R. M. & Frank, M. G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Numerical simulation of the Mori geothermal field, JP

Description: A numerical study of the Mori geothermal field which consisted of a series of three-dimensional natural state modeling and history matching was carried out with porous models. Finally satisfactory fits both on temperature and pressure of the natural state and on pressure history caused by exploitation were obtained. The results indicate that the deep hot water ascends mainly through the fractures near the caldera wall and the fractures confined to some lithofaces, and some of the ascending hot … more
Date: January 20, 1994
Creator: Sakagawa, Yukihiro; Takahashi, Masahiro; Hanano, Mineyuki; Ishido, Tsuneo & Demboya, Nobuhiro
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

On the Interpretation of tracer experiments

Description: Recently, two new developments appeared in the literature on modelling flow and transport in heterogeneous systems. The first one is the use of two different concentration variables namely, the resident and flux concentrations, in tracer studies. The second one involves representing the heterogeneity by means of a frequency disribution function for immobile phase size. Based on these developments, this work involves a classification of the solutions of transport equation in heterogeneous system… more
Date: January 20, 1994
Creator: Kocabas, Ibrahim; Horne, Roland N. & Brigham, William E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

An inverse problem solution to the flow of tracers in naturally fractured reservoirs

Description: This paper presents a solution for the inverse problem to the flow of tracers in naturally fractured reservoirs. The models considered include linear flow in vertical fractures, radial flow in horizontal fractures, and cubic block matrix-fracture geometry. The Rosenbrock method for nonlinear regression used in this study, allowed the estimation of up to six parameters for the cubic block matrix fracture geometry. The nonlinear regression for the three cases was carefully tested against syntetic… more
Date: January 20, 1994
Creator: S., Jetzabeth Ramirez; V., Fernando Samaniego; Rodriguez, Fernando & R., Jesus Rivera
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Heat extracted from the long term flow test in the Fenton Hill HDR reservoir

Description: A long-term flow test was carried out in the Fenton Hill HDR Phase-2 reservoir for 14 months during 1992-1993 to examine the potential for supplying thermal energy at a sustained rate as a commercial demonstration of HDR technology. The test was accomplished in several segments with changes in mean flowrate due to pumping conditions. Re-test estimates of the extractable heat content above a minimum useful temperature were based on physical evidence of the size of the Fenton Hill reservoir. A nu… more
Date: January 20, 1994
Creator: Kruger, Paul & Robinson, Bruce
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Managing decline: Optimising generation by prediction of two-phase well productivities

Description: Economic optimisation of the Ohaaki Geothermal Field dual-flash system indicated the requirement to program for sliding High Pressure turbine inlet pressures and the de-rating of individual wells to Intermediate Pressure. A wellbore simulator was used to generate output curves up to 5 years into the future to enable 'what-if' modelling for maximum electrical generation under different scenarios. The key to predicting future output curves as a function of wellhead pressure was predicting two-pha… more
Date: January 20, 1994
Creator: Clotworthy, Allan W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Injection performance evaluation in Unit 13, SMUDGEO{number}1, and Bear Canyon areas of The Southeast Geysers

Description: Steam production data from wells surrounding Unit 13 injection well CA 956A-1 and Unit 16 injection well Barrows-1 were analyzed to estimate annual and cumulative recovery factors due to water injection into these wells. Production and injection data from SMUDGEO#1 and Bear Canyon wellfields were also analyzed to obtain recovery of the injected water in those wellfields. The results of this study may be useful in designing future injection projects in vapor dominated systems.
Date: January 20, 1994
Creator: Goyal, K.P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Theoretical studies of flowrates from slimholes and production-size geothermal wells

Description: The relationship between production rates of large diameter geothermal production wells, and slimholes, is studied. The analysis is based on wells completed in liquid-dominated geothermal fields, where flashing occurs either in the wellbore or at the surface. Effects of drawdown in the reservoir, and pressure drop in the wellbore, are included; heat losses from the wellbore to the formation are not presently included in our analysis. The study concentrates on the influence of well diameter on p… more
Date: January 20, 1994
Creator: Hadgu, Teklu; Zimmerman, Robert W. & Bodvarsson, Gudmundur S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Parametric study of gravity change accompanying geothermal reservoir change calculated by numerical simulation

Description: We conducted feasibility studies of gravity monitoring based upon reservoir simulation. At first, actual field data (although slightly modified) were used for constructing the conceptual model of a geothermal reservoir, particularly for shallow geothermal reservoir case study. Then the possibility of gravity monitoring was confirmed. Secondly, in order to study the possibility of this for deep geothermal reservoir, we constructed simplified models for deep reservoir. Three models were prepared … more
Date: January 20, 1994
Creator: Takasugi, Shinji; Osato, Kazumi & Sato, Tatsuya
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

The effects of CO{sub 2} on steam adsorption

Description: Water adsorption in geothermal reservoir materials was investigated by transient flow technique using steam and COz gas. Theoretical and experimental results indicate that water adsorption exists in vapordominated type of reservoir, but experiments in the past have been limited to pure gases. The common presence of CO2, a non-condensible gas, in a geothermal reservoir necessitated a study of the effect of partial CO2 concentration on adsorption. Experimental laboratory work using a crushed Geys… more
Date: January 20, 1994
Creator: Palar, Steve & Horne, Roland N.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Salt effects on stable isotope partitioning and their geochemical implications for geothermal brines

Description: The effects of dissolved salts (NaCI, KCI, MgCl{sub 2}, CaCI{sub 2}, Na{sub 2}SO{sub 4}, MgSO{sub 4}, and their mixtures) on oxygen and hydrogen isotope partitioning between brines and coexisting phases (vapor and calcite) were experimentally determined at 50-350{degree} C and 300{degree} C, respectively. In liquid-vapor equilibration experiments, for all of the salts studied, the hydrogen isotope fractionation factors between the salt solutions and vapor decreased appreciably (up to 20{permill… more
Date: January 20, 1994
Creator: Horita, Juske; Cole, David R. & Wesolowski, David J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

A study of vapor-liquid flow in porous media

Description: We study the heat transfer-driven liquid-to-vapor phase change in single-component systems in porous media by using pore network models and flow visualization experiments. Experiments using glass micromodels were conducted. The flow visualization allowed us to define the rules for the numerical pore network model. A numerical pore network model is developed for vapor-liquid displacement where fluid flow, heat transfer and capillarity are included at the pore level. We examine the growth process… more
Date: January 20, 1994
Creator: Satik, Cengiz & Yortsos, Yanis C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Use of slim holes for reservoir evaluation at the Steamboat Hills Geothermal Field, Nevada, USA

Description: Three slim holes were drilled at the Steamboat Hills Geothermal Field in northwestern Nevada about 15 km south of Reno. The slim holes were drilled to investigate the geologic conditions, thermal regime and productive characteristics of the geothermal system. They were completed through a geologic sequence consisting of alluvium cemented by geothermal fluids, volcaniclastic materials, and granodiorite. Numerous fractures, mostly sealed, were encountered throughout the drilled depth; however, se… more
Date: January 20, 1994
Creator: Combs, Jim & Goranson, Colin
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
Back to Top of Screen