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Title: Method for determining thermal conductivity and thermal capacity per unit volume of earth in situ

Abstract

A method for determining the thermal conductivity of the earth in situ is based upon a cylindrical probe having a thermopile for measuring the temperature gradient between sets of thermocouple junctions of the probe after it has been positioned in a borehole and has reached thermal equilibrium with its surroundings, and having means for heating one set of thermocouple junctions of the probe at a constant rate while the temperature gradient of the probe is recorded as a rise in temperature over several hours (More than about 3 hours). A fluid annulus thermally couples the probe to the surrounding earth. The recorded temperature curves are related to the earth's thermal conductivity, K infinity, and to the thermal capacity per unit volume, (gamma cp) infinity, by comparison with calculated curves using estimates of K infinity and (gamma cp) infinity in an equation which relates these parameters to a rise in the earth's temperature for a known and constant heating rate.

Inventors:
Publication Date:
OSTI Identifier:
6528267
Patent Number(s):
US 4343181
Assignee:
Dept. of Energy
Resource Type:
Patent
Resource Relation:
Patent File Date: Filed date 11 Mar 1980; Other Information: PAT-APPL-129300
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; BOREHOLES; PROBES; EARTH CRUST; THERMAL CONDUCTIVITY; TEMPERATURE GRADIENTS; MEASURING METHODS; ANNULAR SPACE; CYLINDRICAL CONFIGURATION; DRILLING FLUIDS; FISSION THERMOCOUPLE DETECTORS; HEATING; SPECIFIC HEAT; THERMAL EQUILIBRIUM; THERMOCOUPLES; CAVITIES; CONFIGURATION; EQUILIBRIUM; FLUIDS; MEASURING INSTRUMENTS; NEUTRON DETECTORS; PHYSICAL PROPERTIES; RADIATION DETECTORS; SPACE; THERMODYNAMIC PROPERTIES; 580203* - Geophysics- Geophysical Survey Methods- (1980-1989)

Citation Formats

Poppendiek, H F. Method for determining thermal conductivity and thermal capacity per unit volume of earth in situ. United States: N. p., 1982. Web.
Poppendiek, H F. Method for determining thermal conductivity and thermal capacity per unit volume of earth in situ. United States.
Poppendiek, H F. Tue . "Method for determining thermal conductivity and thermal capacity per unit volume of earth in situ". United States.
@article{osti_6528267,
title = {Method for determining thermal conductivity and thermal capacity per unit volume of earth in situ},
author = {Poppendiek, H F},
abstractNote = {A method for determining the thermal conductivity of the earth in situ is based upon a cylindrical probe having a thermopile for measuring the temperature gradient between sets of thermocouple junctions of the probe after it has been positioned in a borehole and has reached thermal equilibrium with its surroundings, and having means for heating one set of thermocouple junctions of the probe at a constant rate while the temperature gradient of the probe is recorded as a rise in temperature over several hours (More than about 3 hours). A fluid annulus thermally couples the probe to the surrounding earth. The recorded temperature curves are related to the earth's thermal conductivity, K infinity, and to the thermal capacity per unit volume, (gamma cp) infinity, by comparison with calculated curves using estimates of K infinity and (gamma cp) infinity in an equation which relates these parameters to a rise in the earth's temperature for a known and constant heating rate.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1982},
month = {8}
}