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Design considerations for a hard-rock PDC drill bit

Description: This paper discusses the potential for developing a polycrystalline diamond compact (PDC) drill bit for hard-rock applications such as geothermal drilling. It is concluded that in order to use the inherently efficient drag cutting process in such severe applications, measures must be taken to reduce cutter penetrating forces in order to prevent thermally-accelerated cutter wear and thereby improve bit life. A procedure is developed for determining the conditions under which waterjets can be eff… more
Date: August 26, 1985
Creator: Glowka, D.A.
Partner: UNT Libraries Government Documents Department
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Insulating Geothermal Well Casings From Thermal Stress With Nitrogen Gas or Nitrogen Foam

Description: Fenton Hill Hot Dry Rock Geothermal Site Well EE-3 was designed and completed to function as a completion of the reservoirs with the injection well, EE-2, progressed it become evident that it would be desirable to fracture in EE-3 as well to obtain a flow connection between the wells. Unfortunately, the 9-5/8'' od production casing in EE-3 had been pretensioned to 885,000 lbs to accommodate its intended service as a hot water production well. Cool-down of the casing was thus limited to only 11/… more
Date: August 26, 1984
Creator: Dreesen, D. S.; Murphy, H. D.; Zyvoloski, G.; McEligot, D. M.; Dash, Z. & Nicholson, R. N.
Partner: UNT Libraries Government Documents Department
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Modeling discharge requirements for deep geothermal wells at the Cerro Prieto geothermal field, MX

Description: During the mid-l980's, Comision Federal de Electricidad (CFE) drilled a number of deep wells (M-200 series) at the Cerro Prieto geothermal field, Baja California, Mexico to investigate the continuation of the geothermal reservoir to the east of the Cerro Prieto-II and III production areas. The wells encountered permeability at depths ranging from 2,800 to 4,400 m but due to the reservoir depth and the relatively cold temperatures encountered in the upper 1,000 to 2,000 m of the wells, it was no… more
Date: January 26, 1995
Creator: Menzies, Anthony J.; Granados, Eduardo E.; Puente, Hector Gutierrez & Pierres, Luis Ortega
Partner: UNT Libraries Government Documents Department
open access

Geothermal district heating system feasibility analysis, Thermopolis, Wyoming

Description: The purpose of this study is to determine the technical and economic feasibility of constructing and operating a district heating system to serve the residential, commercial, and public sectors in Thermopolis. The project geothermal resource assessment, based on reviews of existing information and data, indicated that substantial hot water resources likely exist in the Rose Dome region 10 miles northeast of Thermopolis, and with quantities capable of supporting the proposed geothermal uses. Pre… more
Date: April 26, 1982
Creator: Goering, Steven W.; Garing, Kenneth L.; Coury, Glenn & Mickley, Michael C.
Partner: UNT Libraries Government Documents Department
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Production/injection characteristics of slim hole and large-diameter wells at the Sumikawa Geothermal Field, JP

Description: Production and injection data from slim holes and large-diameter wells at the Sumikawa Geothermal Field, Japan, were analyzed to determine the effect of wellbore diameter on (1) the productivity/injectivity indices, and (2) on the discharge rate. The injectivity indices for Sumikawa boreholes do not depend on borehole diameter in any systematic manner; furthermore, the productivity indices (for boreholes with liquid feeds) are more or less equal to the injectivity indices. For boreholes with li… more
Date: January 26, 1995
Creator: Garg, Sabody K. & Combs, Jim
Partner: UNT Libraries Government Documents Department
open access

Diagnostics-while drilling: Reducing the cost of geothermal-produced electricity

Description: The goal of this document is to estimate the potential impact of proposed new Diagnostics-While-Drilling technology on the cost of electricity (COE) produced with geothermal energy. A cost model that predicts the COE was developed and exercised over the range of conditions found for geothermal plants in flashed-steam, binary, and enhanced-reservoir (e.g., Hot Dry Rock) applications. The calculations were repeated assuming that DWD technology is available to reduce well costs and improve well pr… more
Date: January 26, 2000
Creator: PRAIRIE,MICHAEL R. & GLOWKA,DAVID A.
Partner: UNT Libraries Government Documents Department
open access

Development and testing of insulated drillpipe

Description: The Geothermal Research Department at Sandia National Laboratories, in collaboration with Drill Cool Systems, Inc., has worked to develop and test insulated drillpipe (IDP). IDP will allow much cooler drilling fluid to reach the bottom of the hole, making possible the use of downhole motors, electronics, and steering tools that are now unusable in high-temperature formations. Other advantages of cooler fluid include reduced degradation of drilling fluid, longer bit life, and reduced corrosion r… more
Date: January 26, 2000
Creator: FINGER,JOHN T.; JACOBSON,RONALD D. & CHAMPNESS,A.T.
Partner: UNT Libraries Government Documents Department
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