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Numerical studies of enthalpy and CO2 transients in two-phasewells

Description: Numerical studies of enthalpy and CO2 transients for wellscompleted in composite reservoir systems are carried out. Both constantrate and constant pressure production are considered. The results showthat relatively small variations in hydrologic parameters and vaporsaturation can have large effects on the enthalpy and CO2 content of theproduced fluids. Field data are presented that illustrate the theoreticalresults obtained.
Date: April 1, 1984
Creator: Bodvarsson, Gudmundur S.
Partner: UNT Libraries Government Documents Department

A summary of modeling studies of the Krafla Geothermal Field,Iceland

Description: A comprehensive modeling study of the Krafla geothermalfield in Iceland has been carried out. The study consists of four tasks:the analysis of well test data, modeling of the natural state of summaryof the the field, the determination of the generating capability of thefield, and modeling of well performance. The results of all four tasksare consistent with field observation.
Date: August 1, 1983
Creator: Bodvarsson, Gudmundur S.; Pruess, Karsten; Stefansson, Valgardur & Eliasson, Einar T.
Partner: UNT Libraries Government Documents Department

Finding Hidden Geothermal Resources in the Basin and Range Using Electrical Survey Techniques: A Computational Feasibility Study

Description: For many years, there has been speculation about "hidden" or "blind" geothermal systems—reservoirs that lack an obvious overlying surface fluid outlet. At present, it is simply not known whether "hidden" geothermal reservoirs are rare or common. An approach to identifying promising drilling targets using methods that are cheaper than drilling is needed. These methods should be regarded as reconnaissance tools, whose primary purpose is to locate high-probability targets for subsequent deep confirmation drilling. The purpose of this study was to appraise the feasibility of finding "hidden" geothermal reservoirs in the Basin and Range using electrical survey techniques, and of adequately locating promising targets for deep exploratory drilling based on the survey results. The approach was purely theoretical. A geothermal reservoir simulator was used to carry out a lengthy calculation of the evolution of a synthetic but generic Great Basin-type geothermal reservoir to a quasi-steady "natural state". Postprocessors were used to try to estimate what a suite of geophysical surveys of the prospect would see. Based on these results, the different survey techniques were compared and evaluated in terms of their ability to identify suitable drilling targets. This process was completed for eight different "reservoir models". Of the eight cases considered, four were "hidden" systems, so that the survey techniques could be appraised in terms of their ability to detect and characterize such resources and to distinguish them from more conventionally situated geothermal reservoirs. It is concluded that the best way to find "hidden" basin and range geothermal resources of this general type is to carry out simultaneous SP and low-frequency MT surveys, and then to combine the results of both surveys with other pertinent information using mathematical "inversion" techniques to characterize the subsurface quantitatively. Many such surveys and accompanying analyses can be carried out for the cost of a single ...
Date: December 1, 2004
Creator: Pritchett, J. W. & publication, not used on
Partner: UNT Libraries Government Documents Department

Studies of injection into naturally fractured reservoirs

Description: A semi-analytical model for studies of cold water injectioninto naturally fractured reservoirs has been developed. The model can beused to design the flow rates and location of injection wells in suchsystems. The results obtained using the model show that initially thecold water will move very rapidly through the fracture system away fromthe well. Later on, conductive heat transfer from the rock matrix blockswill retard the advancement of the cold water front, and eventuallyuniform energy sweep conditions will prevail. Where uniform energy sweepconditions are reached the cold waer movement away from the injectionwell will be identical to that in a porous medium; consequently maximumenergy recovery from the rock matrix will be attained. The time ofuniform energy sweep and the radial distance from the injection wellwhere it occurs are greatly dependent upon the fracture spacing, butindependent of the fracture aperture.
Date: July 1, 1982
Creator: Bodvarsson, Gudmundur S. & Lai, Cheng Hsien
Partner: UNT Libraries Government Documents Department

Geothermal Outreach and Project Financing

Description: The ?Geothermal Outreach and Project Financing? project substantially added to the understanding of geothermal resources, technology, and small business development by both the general public as well as those in the geothermal community.
Date: April 6, 2006
Creator: Battocletti, Elizabeth
Partner: UNT Libraries Government Documents Department

Geothermal Gradient Map of the Conterminous United States

Description: Geothermal gradient map of the United States published by the Hot Dry Rock (HDR) Geothermal Program of the Department of Energy, showing geothermal gradient contours and color-coded based on temperature. The map also contains information about how the information for the map was compiled.
Date: August 1980
Creator: Kron, Andrea
Partner: UNT Libraries Government Documents Department

The Department of Energy and The U.S. Geothermal Energy Program

Description: US geothermal resources are classified according to resource type and estimates of these resources are presented under the categories of (1) maximum resource base, (2) technically recoverable resources, and (3) economically available resources. The objective of the federally funded geothermal program is to accelerated commercial, I.e., non-federal, development of all types of geothermal energy through resource assessment, leasing of federal lands, demonstrations of various types, loan guaranties, and technology development.
Date: January 1, 1981
Creator: Carwile, C.
Partner: UNT Libraries Government Documents Department

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

U.S. Department of Energy State Coupled Resource Assessment Program Final Report for FY 1982

Description: During FY 1982, ESL/UURI tasks under the DOE State Coupled Program included: 2.1 Technical Assistance--Provide assistance to DOE through communicating program objectives, acting as liason among state contractors and other program participants, and writing periodic status reports. promote coordination of this program with other federal geothermal programs. 2.2 Technical Services--Provide geological, geochemical, and geophysical expertise and support as requested by state teams and other program participants to the extent made possible by funding. 2.3 Publications--Document and publish technical aspects of this program that are otherwise not documented in state contractor or other reports, provide DOE with semi-annual technical and status reports. This status report summarizes activities under 2.1 and 2.3. Technical services provided by ESL/UURI to individual state resource assessment teams are summarized in a separate technical support memorandum.
Date: February 1, 1983
Creator: Foley, Duncan
Partner: UNT Libraries Government Documents Department

Ornithological Survey of the Proposed Geothermal Well Site No. 2

Description: The U.S. Fish and Wildlife Service (USFWS 1983) and the State of Hawaii (DLNR 1986) have listed as endangered six forest bird species for the Island of Hawaii. Two of these birds, the O'u (Psittirostra psittacea) and the Hawaiian hawk (Buteo solitarius) may be present within the Geothermal resource sub-zone (Scott et al. 1986). Thus, their presence could impact future development within the resource area. This report presents the results of a bird survey conducted August 11 and 12, 1990 in the sub-zone in and around the proposed well site and pad for True/Mid Pacific Geothermal Well No.2.
Date: August 16, 1990
Creator: Jeffrey, Jack
Partner: UNT Libraries Government Documents Department

Federal Geothermal Research Program Update Fiscal Year 1999

Description: The Department of Energy (DOE) and its predecessors have conducted research and development (R&D) in geothermal energy since 1971. To develop the technology needed to harness the Nation's vast geothermal resources, DOE's Office of Geothermal and Wind Technologies oversees a network of national laboratories, industrial contractors, universities, and their subcontractors. The following mission and goal statements guide the overall activities of the Office of Geothermal and Wind Technologies. This Federal Geothermal Program Research Update reviews the specific objectives, status, and accomplishments of DOE's Geothermal Program for Federal Fiscal Year (FY) 1999. The information contained in this Research Update illustrates how the mission and goals of the Office of Geothermal and Wind Technologies are reflected in each R&D activity. The Geothermal Program, from its guiding principles to the most detailed research activities, is focused on expanding the use of geothermal energy.
Date: February 1, 2004
Partner: UNT Libraries Government Documents Department

Draft Executive Summary Hawaii Geothermal Project - EIS Scoping Meetings

Description: After introductions by the facilitator and the program director from DOE, process questions were entertained. It was also sometimes necessary to make clarifications as to process throughout the meetings. Topics covered federal involvement in the HGP-EIS; NEPA compliance; public awareness, review, and access to information; Native Hawaiian concerns; the record of decision, responsibility with respect to international issues; the impacts of prior and on-going geothermal development activities; project definition; alternatives to the proposed action; necessary studies; Section 7 consultations; socioeconomic impacts; and risk analysis. Presentations followed, in ten meetings, 163 people presented issues and concerns, 1 additional person raised process questions only.
Date: March 1, 1992
Partner: UNT Libraries Government Documents Department

Panel Session--Rapporteurs' Reports Various Definitions of Geothermal Reserves

Description: To assess the importance of the confidence level of geothermal resources to those involved with the decisions on utilization, it was felt that a panel discussion to review the factors which affect the confidence level would be of general interest. With that objective, the panel members listed above were convened to discuss the problems of confidence level of the various sectors of the geothermal community. To allow for freedom of expression of the panel members, formal prepared presentations were not required. Instead three rapporteurs also representing diverse sectors of the community, industry, non-profit institutions, and government agencies, were requested to prepare summary overviews of the panelists remarks. The rapporteur reports follow.
Date: December 14, 1977
Partner: UNT Libraries Government Documents Department