Temperature transient analysis of oil and gas fields in Russia has long history. The paper is dedicated to application of temperature transient analysis for monitoring ESP wells. Currently several technologies of monitoring ESP wells are used on practice:

  • analysis of residual temperature distributions in wellbore after pumping equipment is pulled-out

  • measurement along the wellbore in the formation intervals during moving of cable equipment, lowered by pump

  • logging through tubing above the pump

  • measurements with permanently installed sensors below ESP.

The analytical and numerical models of temperature transient analysis in the wellbore taking into account convective heat transfer, heat generation in the pump and electric motor, counter flow in annular space and thermo-hydrodynamic effects in reservoir are described. In particular the possibility of gas-liquid contact and oil-water contact determination in annular space based on temperature logging through tubing is shown. Obtained results are of the interest as for production monitoring as well as for the control and management of pump-lifting equipment operations.

This paper presents the case studies of temperature logging conducted in ESP wells of oilfields of Russia.

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