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in creator/contributor: "Henfling, J."  
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Design of a pressure/temperature logging system for geothermal applications

Description: Past memory logging tools have provided excellent pressure/temperature data when used in a geothermal environment, and they are easier to maintain and deploy than tools requiring an electric wireline connection to the surface. However, they are deficient since the tool operator is unaware of downhole conditions that could require changes in the logging program. Tools that make ``decisions`` based on preprogrammed scenarios can partially overcome this difficulty, and a suite of such memory tools… more
Date: April 1, 1994
Creator: Lysne, P. & Henfling, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

High temperature spectral gamma well logging

Description: A high temperature spectral gamma tool has been designed and built for use in small-diameter geothermal exploration wells. Several engineering judgments are discussed regarding operating parameters, well model selection, and signal processing. An actual well log at elevated temperatures is given with spectral gamma reading showing repeatability.
Date: January 1, 1997
Creator: Normann, R.A. & Henfling, J.A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Precision pressure/temperature logging tool

Description: Past memory logging tools have provided excellent pressure/temperature data when used in a geothermal environment, and they are easier to maintain and deploy than tools requiring an electric wireline connection to the surface. However, they are deficient since the tool operator is unaware of downhole conditions that could require changes in the logging program. Tools that make ``decisions`` based on preprogrammed scenarios can partially overcome this difficulty, and a suite of such memory tools… more
Date: January 1, 1998
Creator: Henfling, J.A. & Normann, R.A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Surface pressure measurements for CFD code validation in hypersonic flow

Description: Extensive surface pressure measurements were obtained on a hypersonic vehicle configuration at Mach 8. All of the experimental results were obtained in the Sandia National Laboratories Mach 8 hypersonic wind tunnel for laminar boundary layer conditions. The basic vehicle configuration is a spherically blunted 10{degrees} half-angle cone with a slice parallel with the axis of the vehicle. The bluntness ratio of the geometry is 10% and the slice begins at 70% of the length of the vehicle. Surface… more
Date: July 1, 1995
Creator: Oberkampf, W. L.; Aeschliman, D. P.; Henfling, J. F. & Larson, D. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Tool development and application: pressure, temperature, spectral gamma ray logging of the SB-15 well

Description: Sandia`s involvement with downhole instrumentation dates from the mid 1970s when work was centered on the development of a high-temperature acoustic borehole televiewer, and the establishment of a list of high- temperature component parts such as resistors, integrated circuits, and sensors. This work evolved into the development of memory logging devices for the US Continental Scientific Drilling Program. These tools were of low cost and very easy to use. Their deployment resulted in scientific… more
Date: December 1, 1996
Creator: Sattler, A.R.; Norman, R. & Henfling, J.A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Subsurface steam sampling in Geysers wells

Description: A new downhole sampling tool has been built for use in steam wells at The Geysers geothermal reservoir. The tool condenses specimens into an initially evacuated vessel that is opened down hole at the direction of an on-board computer. The tool makes a temperature log of the well as it is deployed, and the pressure and temperature of collected specimens are monitored for diagnostic purposes. Initial tests were encouraging, and the Department of Energy has funded an expanded effort that includes … more
Date: January 1, 1997
Creator: Lysne, P.; Koenig, B.; Hirtz, P.; Normann, R. & Henfling, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Core-tube data logger

Description: Wireline core drilling, increasingly used for geothermal exploration, employs a core-tube to capture a rock core sample during drilling. Three types of core-tube data loggers (CTDL) have been built and tested to date by Sandia national Laboratories. They are: (1) temperature-only logger, (2) temperature/inclinometer logger and (3) heat-shielded temperature/inclinometer logger. All were tested during core drilling operations using standard wireline diamond core drilling equipment. While these to… more
Date: January 1, 1997
Creator: Henfling, J.A.; Normann, R.A.; Knudsen, S. & Drumheller, D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Hydraulic fracturing tests in anhydrite interbeds in the WIPP, Marker Beds 139 and 140

Description: Hydraulic fracturing tests were integrated with hydrologic tests to estimate the conditions under which gas pressure in the disposal rooms in the Waste Isolation Pilot Plant, Carlsbad, NM (WIPP) will initiate and advance fracturing in nearby anhydrite interbeds. The measurements were made in two marker beds in the Salado formation, MB139 and MB140, to explore the consequences of existing excavations for the extrapolation of results to undisturbed ground. The interpretation of these measurements… more
Date: May 1, 1997
Creator: Wawersik, W. R.; Carlson, L. W.; Henfling, J. A.; Borns, D. J.; Howard, C. L. & Roberts, R. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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