# 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}

}