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

Abstract

A method and apparatus for determining the thermal conductivity of the earth in situ is based upon a cylindrical probe (10) having a thermopile (16) for measuring the temperature gradient between sets of thermocouple junctions (18 and 20) of the probe after it has been positioned in a borehole and has reached thermal equilibrium with its surroundings, and having means (14) for heating one set of thermocouple junctions (20) of the probe at a constant rate while the temperature gradient of the probe is recorded as a rise in temperature over several (more than about 3). A fluid annulus thermally couples the probe to the surrounding earth. The recorded temperature curves are related to the earth's thermal conductivity, k/sub infinity/, and to the thermal capacity per unit volume, (..gamma..c/sub p/)/sub infinity/, by comparison with calculated curves using estimates of K/sub infinity/ and (..gamma..c/sub p/)/sub 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:
6686369
Assignee:
Dept. of Energy
DOE Contract Number:  
E(04-3)-1318
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; THERMAL CONDUCTIVITY; MEASURING METHODS; BOREHOLES; EARTH CRUST; IN-SITU PROCESSING; TEMPERATURE GRADIENTS; THERMOCOUPLES; VOLUME; CAVITIES; MEASURING INSTRUMENTS; PHYSICAL PROPERTIES; PROCESSING; THERMODYNAMIC PROPERTIES; 580200* - Geophysics- (-1989); 580100 - Geology & Hydrology- (-1989)

Citation Formats

Poppendiek, H F. Method and apparatus for determining thermal conductivity and thermal capacity per unit volume of earth in situ. United States: N. p., 1980. Web.
Poppendiek, H F. Method and apparatus for determining thermal conductivity and thermal capacity per unit volume of earth in situ. United States.
Poppendiek, H F. Tue . "Method and apparatus for determining thermal conductivity and thermal capacity per unit volume of earth in situ". United States.
@article{osti_6686369,
title = {Method and apparatus for determining thermal conductivity and thermal capacity per unit volume of earth in situ},
author = {Poppendiek, H F},
abstractNote = {A method and apparatus for determining the thermal conductivity of the earth in situ is based upon a cylindrical probe (10) having a thermopile (16) for measuring the temperature gradient between sets of thermocouple junctions (18 and 20) of the probe after it has been positioned in a borehole and has reached thermal equilibrium with its surroundings, and having means (14) for heating one set of thermocouple junctions (20) of the probe at a constant rate while the temperature gradient of the probe is recorded as a rise in temperature over several (more than about 3). A fluid annulus thermally couples the probe to the surrounding earth. The recorded temperature curves are related to the earth's thermal conductivity, k/sub infinity/, and to the thermal capacity per unit volume, (..gamma..c/sub p/)/sub infinity/, by comparison with calculated curves using estimates of K/sub infinity/ and (..gamma..c/sub p/)/sub 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 = {1980},
month = {3}
}