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Caliper variable sonde for thermal conductivity measurements in situ

Journal Article:

Abstract

For the measurement of the thermal conductivity of the formations surrounding a borehole, a sonde having variable diameter (consisting of an inflatable rubber cylinder with heating wires embedded in its wall) is described. The conditions for the usual sonde made of metal are no longer fulfilled, but the solution to the problem of determining the thermal conductivity from the temperature rise is given, based on an approach by Carslaw and Jaeger, which contains the Bessel functions of the second kind. It is shown that a simpler solution for large values of time can be obtained through the Laplace transformation, and the necessary series developments for computer application are also given. The sonde and the necessary measuring circuitry are described. Tests measurements have indicated that the thermal conductivity can be determined with this sonde with a precision of + 10%.
Publication Date:
Jan 01, 1968
Product Type:
Journal Article
Reference Number:
EDB-82-137836
Resource Relation:
Journal Name: Freiberg. Forschungsh. C; (German Democratic Republic); Journal Volume: 232
Subject:
02 PETROLEUM; PROBES; DESIGN; RESERVOIR ROCK; THERMAL CONDUCTIVITY; RESERVOIR TEMPERATURE; MEASURING METHODS; REMOTE SENSING; BOREHOLES; COMPUTERS; CAVITIES; PHYSICAL PROPERTIES; THERMODYNAMIC PROPERTIES; 020300* - Petroleum- Drilling & Production
OSTI ID:
5202495
Country of Origin:
Germany
Language:
German
Other Identifying Numbers:
Journal ID: CODEN: FFRCA
Submitting Site:
HEDB
Size:
Pages: 47-65
Announcement Date:

Journal Article:

Citation Formats

Oelsner, C, Leischner, H, and Pischel, S. Caliper variable sonde for thermal conductivity measurements in situ. Germany: N. p., 1968. Web.
Oelsner, C, Leischner, H, & Pischel, S. Caliper variable sonde for thermal conductivity measurements in situ. Germany.
Oelsner, C, Leischner, H, and Pischel, S. 1968. "Caliper variable sonde for thermal conductivity measurements in situ." Germany.
@misc{etde_5202495,
title = {Caliper variable sonde for thermal conductivity measurements in situ}
author = {Oelsner, C, Leischner, H, and Pischel, S}
abstractNote = {For the measurement of the thermal conductivity of the formations surrounding a borehole, a sonde having variable diameter (consisting of an inflatable rubber cylinder with heating wires embedded in its wall) is described. The conditions for the usual sonde made of metal are no longer fulfilled, but the solution to the problem of determining the thermal conductivity from the temperature rise is given, based on an approach by Carslaw and Jaeger, which contains the Bessel functions of the second kind. It is shown that a simpler solution for large values of time can be obtained through the Laplace transformation, and the necessary series developments for computer application are also given. The sonde and the necessary measuring circuitry are described. Tests measurements have indicated that the thermal conductivity can be determined with this sonde with a precision of + 10%.}
journal = {Freiberg. Forschungsh. C; (German Democratic Republic)}
volume = {232}
journal type = {AC}
place = {Germany}
year = {1968}
month = {Jan}
}