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Determination of the thermal conductivity of sediment rock from measurements on cuttings; Ermittlung der Gesteinswaermeleitfaehigkeit von Sedimentgesteinen aus Messungen am Bohrklein

Abstract

Due to high costs core recovery in many wells is strongly restricted. To determine thermal conductivity in these cases measurements on cuttings are necessary, since in situ measurements are expensive and protracted, too. Therefore cores from three hydrogeothermal wells of the north-east part of the German sedimentary basin were grinded to compare the results of measurements on cuttings with known values of thermal conductivity from the original cores. By a suitable model of the two-phase-system cuttings-water it is possible to calculate the thermal conductivity of the rock-matrix. On the basis of this value and a suitable rock-model an average thermal conductivity for the water saturated rock can be estimated. Certainly all influences of the texture (anisotropy, grain bond) and of the characteristics of the porespace (porosity, internal surface, saturation, permeability) are lost with measurements on cuttings. Therefore for the different systems cuttings-water and rock-porefluid as well as for different rock types different models are necessary. (orig.) [Deutsch] In vielen Bohrungen werden aus Kostengruenden keine Kerne gezogen. Fuer die Ermittlung der Waermeleitfaehigkeit koennen deshalb nur in-situ-Messungen, die ebenfalls zeit- und kostenintensiv sind, oder Messungen am Bohrklein herangezogen werden. Es wurden daher Kerne aus drei Hydrogeothermalbohrungen des nordostdeutschen Beckens aufgemahlen, um so  More>>
Authors:
Troschke, B; Burkhardt, H [1] 
  1. Technische Univ. Berlin (Germany). Fachgebiet Angewandte Goephysik
Publication Date:
Dec 01, 1997
Product Type:
Conference
Report Number:
ETDE-DE-597; CONF-9609413-
Reference Number:
SCA: 152002; PA: DE-97:0GH986; EDB-98:028022; SN: 97001883249
Resource Relation:
Conference: 4. meeting on geothermics - 7. experts meeting of Schweizerische Vereinigung fuer Geothermie (SVG): Geothermics - energy for the future, 4. Geothermische Fachtagung - 7. Fachtagung der Schweizerischen Vereinigung fuer Geothermie (SVG): Geothermie - Energie der Zukunft, Konstanz (Germany), 18-20 Sep 1996; Other Information: PBD: 1997; Related Information: Is Part Of Geothermics - energy for the future. Proceedings; PB: 499 p.; Geothermie - Energie der Zukunft. Tagungsband
Subject:
15 GEOTHERMAL ENERGY; THERMAL CONDUCTIVITY; ROCKS; ROCK MECHANICS; BOREHOLES; GEOTHERMAL SYSTEMS; ROCK-FLUID INTERACTIONS; DIAGRAMS; DATA
OSTI ID:
573577
Country of Origin:
Germany
Language:
German
Other Identifying Numbers:
Other: ON: DE98714933; ISBN 3-932570-09-X; TRN: DE97GH986
Availability:
OSTI as DE98714933
Submitting Site:
DE
Size:
pp. 217-223
Announcement Date:

Citation Formats

Troschke, B, and Burkhardt, H. Determination of the thermal conductivity of sediment rock from measurements on cuttings; Ermittlung der Gesteinswaermeleitfaehigkeit von Sedimentgesteinen aus Messungen am Bohrklein. Germany: N. p., 1997. Web.
Troschke, B, & Burkhardt, H. Determination of the thermal conductivity of sediment rock from measurements on cuttings; Ermittlung der Gesteinswaermeleitfaehigkeit von Sedimentgesteinen aus Messungen am Bohrklein. Germany.
Troschke, B, and Burkhardt, H. 1997. "Determination of the thermal conductivity of sediment rock from measurements on cuttings; Ermittlung der Gesteinswaermeleitfaehigkeit von Sedimentgesteinen aus Messungen am Bohrklein." Germany.
@misc{etde_573577,
title = {Determination of the thermal conductivity of sediment rock from measurements on cuttings; Ermittlung der Gesteinswaermeleitfaehigkeit von Sedimentgesteinen aus Messungen am Bohrklein}
author = {Troschke, B, and Burkhardt, H}
abstractNote = {Due to high costs core recovery in many wells is strongly restricted. To determine thermal conductivity in these cases measurements on cuttings are necessary, since in situ measurements are expensive and protracted, too. Therefore cores from three hydrogeothermal wells of the north-east part of the German sedimentary basin were grinded to compare the results of measurements on cuttings with known values of thermal conductivity from the original cores. By a suitable model of the two-phase-system cuttings-water it is possible to calculate the thermal conductivity of the rock-matrix. On the basis of this value and a suitable rock-model an average thermal conductivity for the water saturated rock can be estimated. Certainly all influences of the texture (anisotropy, grain bond) and of the characteristics of the porespace (porosity, internal surface, saturation, permeability) are lost with measurements on cuttings. Therefore for the different systems cuttings-water and rock-porefluid as well as for different rock types different models are necessary. (orig.) [Deutsch] In vielen Bohrungen werden aus Kostengruenden keine Kerne gezogen. Fuer die Ermittlung der Waermeleitfaehigkeit koennen deshalb nur in-situ-Messungen, die ebenfalls zeit- und kostenintensiv sind, oder Messungen am Bohrklein herangezogen werden. Es wurden daher Kerne aus drei Hydrogeothermalbohrungen des nordostdeutschen Beckens aufgemahlen, um so vergleichende Messungen am `Bohrklein` aus Kernen mit bekannter Waermeleitfaehigkeit durzhzufuehren. Durch eine geeignete Modellvorstellung des Zwei-Phasen-Systems Bohrklein/Wasser laesst sich die Waermeleitfaehigkeit der Gesteinsmatrix bestimmen und aus dieser durch ein Gesteinsmodell auch eine mittlere Waermeleitfaehigkeit des wassergesaettigten Festgesteins berechnen. Klar ist, dass bei Messungen am Bohrklein Einfluesse, die durch Gefuege (Anisotropie, Kornbindung) und Porenraumeigenschaften (Porositaet, Saettigung, Permeabilitaet) hervorgerufen werden, verloren gehen. Dies fuehrt dazu, dass fuer die Systeme Bohrklein/Wasser und Bohrkern/Porenfluid unterschiedliche Modellansaetze gewaehlt werden muessen. (orig.)}
place = {Germany}
year = {1997}
month = {Dec}
}