Search Results

Advanced search parameters have been applied.
open access

Northwest Geothermal Corp. 's (NGC) plan of exploration, Mt. Hood Area, Clackamas County, Oregon

Description: The Area Geothermal Supervisor (AGS) received a Plan of Operations (POO) from Northwest Geothermal Corporation (NGC) on 2/12/80. In the POO, NGC proposed two operations: testing and abandoning an existing 1219 meter (m) geothermal temperature gradient hole, designated as OMF No. 1, and drilling and testing a new 1524 m geothermal exploratory hole, to be designated as OMF No. 7A. The POO was amended on 5/6/80, to provide for the use of an imp
Date: May 1, 1980
Partner: UNT Libraries Government Documents Department
open access

Breakthrough Time for the Source-Sink Well Doublet

Description: A pressure transient analysis method is presented for interpreting breakthrough time between two constant rate wells. The wells are modeled as two line source wells in an infinite reservoir. The first well injects at a constant rate and the second well produces at a constant rate. We studied the effects of transient pressure conditions on breakthrough time. The first arrival of injected fluid at the production well may be significantly longer under transient condition than under steady state condition. A correlation of the deviation of the breakthrough time for transient pressure conditions from the steady state condition is presented.
Date: January 21, 1986
Creator: Menninger, Will & Sageev, Abraham
Partner: UNT Libraries Government Documents Department
open access

Laboratory measurement of sorption in porous media

Description: A new apparatus for measuring steam adsorption-desorption isothermally on rock samples has been installed and initial runs made for rock samples from geothermal reservoirs. The amounts adsorbed measured in these experiments are the same order of magnitude as previous experiments.
Date: January 1, 1992
Creator: Harr, M. S.; Pettit, P. & Ramey, J. J., Jr.
Partner: UNT Libraries Government Documents Department
open access

Development of PDC Bits for Downhole Motors

Description: To develop polycrystalline hamond compact (PDC) bits of the full-face type which can be applied to downhole motor drilling, drilling tests for granite and two types of andesite were conducted using bits with 98.43 and 142.88 mm diameters. The bits successfully drilled these types of rock at rotary speeds from 300 to 400 rpm.
Date: January 1, 1995
Creator: Karasawa, H. & Ohno, T.
Partner: UNT Libraries Government Documents Department
open access

Analysis of production decline in geothermal reservoirs

Description: The major objectives of the Decline Curve project were to: (1) test the decline analysis methods used in the petroleum industry on geothermal production data; (2) examine and/or develop new analysis methods; and (3) develop a standard operating procedure for analyzing geothermal production data. Various analysis methods have long been available but they have not been tested on geothermal data because of the lack of publicly available data. The recent release to publication of substantial data sets from Wairakei, New Zealand, Cerro Prieto, Mexico and The Geysers, USA has made this study possible. Geothermal reservoirs are quite different from petroleum reservoirs in many ways so the analysis methods must be tested using geothermal data.
Date: September 1, 1980
Creator: Zais, Elliot J. & Bodvarsson, Gunnar
Partner: UNT Libraries Government Documents Department
open access

United States geothermal technology: Equipment and services for worldwide applications

Description: This document has two intended audiences. The first part, ``Geothermal Energy at a Glance,`` is intended for energy system decision makers and others who are interested in wide ranging aspects of geothermal energy resources and technology. The second part, ``Technology Specifics,`` is intended for engineers and scientists who work with such technology in more detailed ways. The glossary at the end of the document defines many of the specialized terms. A directory of US geothermal industry firms who provide goods and services for clients around the world is available on request.
Date: May 1, 1995
Partner: UNT Libraries Government Documents Department
open access

Geothermal Progress Monitor. Report No. 15

Description: Two themes dominate this issue of the Geothermal Progress Monitor, the 15th since its inception in 1980. The first of these is the significance of the government/industry partnership role in geothermal development. This joint effort is reflected in the continued, measured growth in the use of geothermal energy, for both power generation and direct use applications, in this country and abroad, as well as in the development of new, innovative technologies to ensure a bright future for the resource. The second theme is the growing popularity of geothermal heat pumps (GHPs) among utilities, their customers, and federal agencies, all with disparate interests in the technology.
Date: December 1, 1993
Partner: UNT Libraries Government Documents Department
open access

Geothermal development of the Salton Trough, California and Mexico

Description: A geological description is given of the Salton Trought followed by a chronological history of attempts to exploit the area's geothermal resources. In addition, detailed descriptions are given of all ongoing geothermal projects in the area and the organizations conducting them.
Date: April 1, 1975
Creator: Palmer, T. D.; Howard, J. H. & Lande, D. P. (eds.)
Partner: UNT Libraries Government Documents Department
open access

Disposal of Flashed Brine Dosed with CaCO{sub3} Scale Inhibitor: What Happens When the Inhibitor is Exhausted?

Description: A freshly flashed geothermal liquid, previously dosed with inhibitor and super-saturated with calcite was injected into another well where it displaced an unflashed counterpart of itself around the wellbore. Back-production of the injectate, and subsequently the native fluid, has yielded data for the rate that a scale inhibitor is degraded after injection. The circumstance also displays a novel mechanism whereby two fluids that do not physically mix never the less reactive with one another through the reservoir rock's serving a role of intermediary. The results have been further interpretated to conclude that in some circumstances a short lifetime for the scale inhibitor is not necessarily a problem for long-term injection.
Date: December 15, 1983
Creator: Michels, D. E.
Partner: UNT Libraries Government Documents Department
open access

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 TOUGH and second we show inspection results of the accuracy and improvements of speed, and then we show the case study results. Before conducting this case study, the porous medium model for the case study is optimized. As the case study we tried to analyze build-up data acquired by PTS (Pressure/Temperature/Spinner) logging in a two-phase condition. We have been successful in obtaining a good match to PTS data.
Date: January 1, 1991
Creator: Okabe, T.; Osato, K. & Takasugi, S.
Partner: UNT Libraries Government Documents Department
open access

Industrial Consortium for the Utilization of the Geopressured-Geothermal Resource. Volume 1

Description: The Geopressured-Geothermal Program, now in its fifteenth year, is entering the transition period to commercial use. The industry cost-shared proposals to the consortium, represented in the presentations included in these proceedings, attest to the interest developing in the industrial community in utilizing the geopressured-geothermal resource. Sixty-five participants attended these sessions, two-thirds of whom represented industry. The areas represented by cost-shared proposals include (1) thermal enhanced oil recovery, (2) direct process use of thermal energy, e.g., aquaculture and agriculture, (3) conversion of thermal energy to electricity, (4) environment related technologies, e.g., use of supercritical processes, and (5) operational proposals, e.g., a field manual for scale inhibitors. It is hoped that from this array of potential use projects, some will persist and be successful in proving the viability of using the geopressured-geothermal resource. Such industrial use of an alternative and relatively clean energy resource will benefit our nation and its people.
Date: March 1, 1990
Creator: Negus-deWys, J. (ed.)
Partner: UNT Libraries Government Documents Department
open access

Annotated research bibliography for geothermal reservoir engineering

Description: Despite efforts of conscientious researchers, the current volume of published materials makes it virtually impossible to review all relevant publications in a given field. As a result it has been estimated that approximately one-tenth of the research and development funds expended in the United States has been applied to areas resulting in a duplication of efforts. This has been attributed to inadequate literature review. An up-to-date annotated bibliography has been prepared which assisted in avoiding duplication of reservoir engineering research and served as a definitive record of the progress and current status of the subject. bibliography included English, Italian, Russian and Japanese language publications. Individual documents have been grouped under the following major subject categories: (1) Formation Evaluation; (2) Reservoir Modeling; (3) Exploitation Strategies; and (4) Evaluation of Production Trends.
Date: January 1, 1978
Creator: Randall, G.S. & Harrison, R.F.
Partner: UNT Libraries Government Documents Department
open access

National advanced drilling and excavation technologies program: Summary of third meeting of interested Federal agencies

Description: The purpose of the meeting was: (1) to discuss a proposal by the Massachusetts Institute of Technology (MIT) outlining a National Advanced Drilling and Excavation Technologies Program, (2) to brief participants on events since the last meeting, and (3) to hear about drilling research activities funded by the Department of Energy. The meeting agenda is included as Attachment B.
Date: December 7, 1993
Partner: UNT Libraries Government Documents Department
Back to Top of Screen