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Lost circulation technology development status

Description: Lost circulation is the loss of drilling fluid from the wellbore to fractures or pores in the rock formation. In geothermal drilling, lost circulation is often a serious problem that contributes greatly to the cost of the average geothermal well. The Lost Circulation Technology Development Program is sponsored at Sandia National Laboratories by the US Department of Energy. The goal of the program is to reduce lost circulation costs by 30--50% through the development of mitigation and characteri… more
Date: January 1, 1992
Creator: Glowka, D. A.; Schafer, D. M.; Loeppke, G. E.; Scott, D. D.; Wernig, M. D. & Wright, E. K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Design of a diesel exhaust-gas purification system for inert-gas drilling

Description: To combat the serious oxygen corrosion of drill pipe when a low density drilling fluid (air or mist) is used in geothermal drilling, a system has been designed that produces an inert gas (essentially nitrogen) to be substituted for air. The system fits on three flatbed trailers, is roadable and produces 2000 scfm of gas. The projected cost for gas is slightly less than $2.00 per thousand standard cubic feet.
Date: January 1, 1982
Creator: Caskey, B. C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Geothermal drilling problems and their impact on cost

Description: Historical data are presented that demonstrate the significance of unexpected problems. In extreme cases, trouble costs are the largest component of well costs or severe troubles can lead to abandonment of a hole. Drilling experiences from US geothermal areas are used to analyze the frequency and severity of various problems. In addition, average trouble costs are estimated based on this analysis and the relationship between trouble and depth is discussed. The most frequent drilling and complet… more
Date: January 1, 1982
Creator: Carson, C. C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Advanced materials for geothermal energy processes

Description: The primary goal of the geothermal materials program is to ensure that the private sector development of geothermal energy resources is not constrained by the availability of technologically and economically viable materials of construction. This requires the performance of long-term high risk GHTD-sponsored materials R and D. Ongoing programs described include high temperature elastomers for dynamic sealing applications, advanced materials for lost circulation control, waste utilization and di… more
Date: August 1, 1985
Creator: Kukacka, L. E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Drilling fluid/formation interaction at simulated in situ geothermal conditions. Final report

Description: Interaction of drilling fluids with a geothermal reservoir formation can result in significant permeability impairment and therefore reduced well productivity. This interaction is studied under simulated in situ geothermal conditions of overburden stress, pore fluid pressure, temperature, and pore fluid chemistry. Permeability impairment of an East Mesa KGRA reservoir material is evaluated as a function of stagnation time, drilling fluid, and temperature. Results indicate that all of these para… more
Date: July 1, 1980
Creator: Enniss, D. O.; Bergosh, J. L.; Butters, S. W. & Jones, A. H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Phase 2 drilling operations at the Long Valley Exploratory Well (LVF 51--20)

Description: This report describes the second drilling phase, completed to a depth of 7588 feet in November 1991, of the Long Valley Exploratory Well near Mammoth Lakes, California. The well in Long Valley Caldera is planned to reach an ultimate depth of 20,000 feet or a bottomhole temperature of 500{degrees}C (whichever comes first). There will be four drilling phases, at least a year apart with scientific experiments in the wellbore between active drilling periods. Phase 1 drilling in 1989 was completed w… more
Date: June 1, 1992
Creator: Finger, J. T. & Jacobson, R. D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Development and evaluation of a meter for measuring return line fluid flow rates during drilling

Description: The most costly problem routinely encountered in geothermal drilling is lost circulation, which occurs when drilling fluid is lost to the formation rather than circulating back to the surface. The successful and economical treatment of lost circulation requires the accurate measurement of drilling fluid flow rate both into and out of the well. This report documents the development of a meter for measuring drilling fluid outflow rates in the return line of a drilling rig. The meter employs a rol… more
Date: June 1, 1992
Creator: Loeppke, G. E.; Schafer, D. M.; Glowka, D. A.; Scott, D. D.; Wernig, M. D. & Wright, E. K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Drilling technology/GDO

Description: The Geothermal Technology Division of the US Department of Energy is sponsoring two programs related to drilling technology. The first is aimed at development of technology that will lead to reduced costs of drilling, completion, and logging of geothermal wells. This program has the official title ''Hard Rock Penetration Mechanics.'' The second program is intended to share with private industry the cost of development of technology that will result in solutions to the near term geothermal well … more
Date: January 1, 1985
Creator: Kelsey, J.R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Geothermal drilling research in the United States

Description: Current research and development in the following areas are presented: geothermal roller cone bits, polycrystalline diamond compact bits, a continuous chain drill, drilling fluids test equipment, mud research, inert fluids, foam fluids, lost circulation control, completion technology, and advanced drilling and completion systems. (MHR)
Date: January 1, 1980
Creator: Varnado, S. G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Geothermal drilling and completion technology development program. Quarterly progress report, January-March 1980

Description: The progress, status, and results of ongoing Research and Development (R and D) within the Geothermal Drilling and Completion Technology Development Program are described. The program emphasizes the development of geothermal drilling hardware, drilling fluids, completion technology, and lost circulation control methods. Advanced drilling systems are also under development. The goals of the program are to develop the technology required to reduce well costs by 25% by 1983 and by 50% by 1987.
Date: April 1, 1980
Creator: Varnado, S.G. (ed.)
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Considerations in the use of water jets to enlarge deep submerged cavities

Description: In order to facilitate use of reinjection wells, and to lower their cost, it has been proposed that a single well be reamed from 22-1/2 cm to 2 m diameter over an increment of 70 m at a depth of 2000 m. In this manner a single well would be capable of coping with flow rates which currently necessitate a dozen wells being emplaced. The problems encountered in using high pressure water jets for this reaming operation are described. Limiting parameters on the use of high pressure water jets and th… more
Date: January 1, 1980
Creator: Summers, D.A. & Sebastian, Z.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Investigating the impact of drilling mud and its major components on bivalve species of Georges bank. Progress report No. 2, February 28, 1979-November 1, 1979

Description: Results described in progress report No. 1 indicate that 0.3-1.0 grams of drilling mud/liter of seawater can stress bivalve molluscs and that metallic components of drilling muds are assimilated by these organisms. The results posed questions about the short- and long-term effects of stress on energy stores, reproduction, and metal assimilation; accordingly, this year's research program has focused on these three areas and on a continued chemical characterization of the drilling muds used.
Date: November 1, 1979
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Geothermal drilling and completion technology development program. Quarterly progress report, April-June 1980

Description: The progress, status, and results of ongoing research and development (R and D) within the Geothermal Drilling and Completion Technology Development Program are reported. The program emphasizes the development of geothermal drilling hardware, drilling fluids, completion technology, and lost circulation control methods. Advanced drilling systems are also under development. The goals of the program are to develop the technology required to reduce well costs by 25% by 1983 and by 50% by 1987.
Date: July 1, 1980
Creator: Varnado, S. G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Frictional heating and convective cooling of polycrystalline diamond drag tools during rock cutting

Description: A numerical-analytical model is developed to predict temperatures in stud-mounted polycrystalline diamond compact (PDC) drag tools during rock cutting. Experimental measurements of the convective heat transfer coefficient for PDC cutters are used in the model to predict temperatures under typical drilling conditions with fluid flow. The analysis compares favorably with measurements of frictional temperatures in controlled cutting tests on Tennessee marble. It is shown that mean cutter wearflat … more
Date: January 1, 1982
Creator: Ortega, A. & Glowka, D.A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Geothermal drilling ad completion technology development program. Semi-annual progress report, April-September 1979

Description: The progress, status, and results of ongoing Research and Development (R and D) within the Geothermal Drilling and Completion Technology Development Program are described. The program emphasizes the development of geothermal drilling hardware, drilling fluids, and completion technology. Advanced drilling systems are also under development. The goals of the program are to develop the technology required to reduce well costs by 25% by 1982 and by 50% by 1986.
Date: May 1, 1980
Creator: Varnado, S.G. (ed.)
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Thermal conductivity of aqueous foam

Description: Thermal conductivity plays an important part in the response of aqueous foams used as geothermal drilling fluids. The thermal conductivity of these foams was measured at ambient conditions using the thermal conductivity probe technique. Foam densities studied were from 0.03 to 0.2 g/cm/sup 3/, corresponding to liquid volume fractions of the same magnitude. Microscopy of the foams indicated bubble sizes in the range 50 to 300 ..mu..m for nitrogen foams, and 30 to 150 ..mu..m for helium foams. Bu… more
Date: May 1, 1982
Creator: Drotning, W.D.; Ortega, A. & Havey, P.E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Full-scale laboratory drilling tests on sandstone and dolomite. Final report

Description: Full-scale laboratory drilling experiments were performed under simulated downhole conditions to determine what effect changing various drilling parameters has on penetration rate. The two rock types, typical of deep oil and gas reservoirs, used for the tests were Colton Sandstone and Bonne Terre Dolomite. Drilling was performed with standard 7/sup 7///sub 8/ inch rotary insert bits and water base mud. The results showed the penetration rate to be strongly dependent on bit weight, rotary speed,… more
Date: December 1, 1977
Creator: Black, A.D.; Green, S.J. & Rogers, L.A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

WELCST: engineering cost model of geothermal wells. Description and user's guide

Description: WELCST, a FORTRAN code for estimating the effects of R and D project results upon the future cost of geothermal wells is described. The code simulates the drilling and completion of a well at 27 specific US geothermal prospects, given assumptions about well design and casing plan, formation drillability, and selected engineering and cost characteristics of today's drilling technology. The user may change many of the assumptions about engineering and cost characteristics to allow WELCST to simul… more
Date: February 1, 1979
Creator: Entingh, D.J. & Lopez, A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Corrective Action Decision Document/Closure Report for Corrective Action Unit 545: Dumps, Waste Disposal Sites, and Buried Radioactive Materials Nevada Test Site, Nevada, Revision 0

Description: This Corrective Action Decision Document (CADD)/Closure Report (CR) has been prepared for Corrective Action Unit (CAU) 545, Dumps, Waste Disposal Sites, and Buried Radioactive Materials, in Areas 2, 3, 9, and 20 of the Nevada Test Site, Nevada, in accordance with the Federal Facility Agreement and Consent Order that was agreed to by the State of Nevada; U.S. Department of Energy (DOE), Environmental Management; U.S. Department of Defense; and DOE, Legacy Management (1996, as amended February 20… more
Date: April 1, 2008
Creator: Wickline, Alfred
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Corrective Action Investigation Plan for Corrective Action Unit 367: Area 10 Sedan, Ess and Uncle Unit Craters Nevada Test Site, Nevada, Revision 0

Description: Corrective Action Unit 367 is located in Area 10 of the Nevada Test Site, which is approximately 65 miles northwest of Las Vegas, Nevada. Corrective Action Unit 367 comprises the four corrective action sites (CASs) listed below: • 10-45-01, U-10h Crater (Sedan) • 10-45-02, Ess Crater Site • 10-09-03, Mud Pit • 10-45-03, Uncle Crater Site The CASs in CAU 367 are being investigated because hazardous and/or radioactive contaminants may be present in concentrations that exceed risk-based corrective… more
Date: December 1, 2009
Creator: Matthews, Patrick
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Aqueous foam surfactants for geothermal drilling fluids: 1. Screening

Description: Aqueous foam is a promising drilling fluid for geothermal wells because it will minimize damage to the producing formation and would eliminate the erosion problems of air drilling. Successful use of aqueous foam will require a high foaming surfactant which will: (1) be chemically stable in the harsh thermal and chemical environment, and (2) form stable foams at high temperatures and pressures. The procedures developed to generate and test aqueous foams and the effects of a 260/sup 0/C temperatu… more
Date: January 1, 1980
Creator: Rand, P.B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Harvester ant bioassay for assessing hazardous chemical waste sites. [Pogonomyrmex owhyeei]

Description: A technique was developed for using harvester ants, Pogonomyrmex owhyeei, in terrestrial bioassays. Procedures were developed for maintaining stock populations, handling ants, and exposing ants to toxic materials. Relative toxicities were determined by exposing ants to 10 different materials. These materials included three insecticides, Endrin, Aldrin, and Dieldrin; one herbicide, 2,4-D; three complex industrial waste residuals, wood preservative sludge, drilling fluid, and slop oil; and three … more
Date: May 1, 1985
Creator: Gano, K. A.; Carlile, D. W. & Rogers, L. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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