Step temperature well testing

Lev Eppelbaum, Izzy M. Kutasov

Research output: Contribution to journalArticlepeer-review


Exact determination of thermal parameters is of high importance in a wide spectrum of both solid Earth investigations and subsurface geological and environmental studies. This article demonstrates a new revisited technique for the precise determination of formation thermal conductivity and contact thermal resistance in boreholes. We assume that the volumetric heat capacity of formations is a priori known, and the instantaneous heat flow rate and time data are available for the cylindrical probe located in borehole with a constant temperature. A dimensionless heat flow rate has been approximated by a new empirical equation, parameters of which were computed by use of the Newton method. An effectiveness of the proposed methodology is shown on modelled examples. A simulated case is given on example of metallic electrical heater placed into a vertical open (uncased) borehole.
Original languageEnglish
Pages (from-to)82-85
Number of pages4
JournalInternational Journal of Petrochemical Science & Engineering
Issue number3
StatePublished - Aug 2017


  • Newton method
  • Thermal conductivity


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