Design and testing of a heat transfer sensor for well exploration tools

Stefano Soprani*, Anders Just Nørgaard, Carsten Nesgaard, Kurt Engelbrecht

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The exploration of oil, gas, and geothermal wells is moving towards increasingly harsher downhole environments, requiring more and more advanced drilling and intervention tools. The high downhole temperatures threaten the correct functionality of intervention equipment and of standard downhole electronics, which cannot withstand temperatures above 150 °C for an extended period of time. Thermal management of downhole electronics therefore requires critical and accurate knowledge of the thermal interaction between the downhole tools and the wellbore environment for correct tool design, intervention planning and operation. In this work, we present the design, modelling and testing of a sensor for downhole tools that can determine the heat transfer rate between the tool and the harsh downhole environment. An experimental flow loop was used to simulate the interaction between the sensor and the well fluid, and to calibrate the sensor in the range of heat transfer coefficients 0–1000 W/m2 K. Good agreement between model predictions and experimental results was obtained with average and maximum errors of ∼3% and ∼10%, respectively. A sensitivity of up to 8.7 mV/(W/m2 K) was measured and a response time of about 11 s was obtained over a 25% change in the fluid velocity.
Original languageEnglish
JournalApplied Thermal Engineering
Volume141
Pages (from-to)887-897
ISSN1359-4311
DOIs
Publication statusPublished - 2018

Keywords

  • Downhole electronics
  • Well interventions
  • Downhole sensor
  • Convective heat transfer
  • Thermally developing flow

Cite this

Soprani, Stefano ; Just Nørgaard, Anders ; Nesgaard, Carsten ; Engelbrecht, Kurt. / Design and testing of a heat transfer sensor for well exploration tools. In: Applied Thermal Engineering. 2018 ; Vol. 141. pp. 887-897.
@article{2e2d23032e4a42cb9cc4de111282798b,
title = "Design and testing of a heat transfer sensor for well exploration tools",
abstract = "The exploration of oil, gas, and geothermal wells is moving towards increasingly harsher downhole environments, requiring more and more advanced drilling and intervention tools. The high downhole temperatures threaten the correct functionality of intervention equipment and of standard downhole electronics, which cannot withstand temperatures above 150 °C for an extended period of time. Thermal management of downhole electronics therefore requires critical and accurate knowledge of the thermal interaction between the downhole tools and the wellbore environment for correct tool design, intervention planning and operation. In this work, we present the design, modelling and testing of a sensor for downhole tools that can determine the heat transfer rate between the tool and the harsh downhole environment. An experimental flow loop was used to simulate the interaction between the sensor and the well fluid, and to calibrate the sensor in the range of heat transfer coefficients 0–1000 W/m2 K. Good agreement between model predictions and experimental results was obtained with average and maximum errors of ∼3{\%} and ∼10{\%}, respectively. A sensitivity of up to 8.7 mV/(W/m2 K) was measured and a response time of about 11 s was obtained over a 25{\%} change in the fluid velocity.",
keywords = "Downhole electronics, Well interventions, Downhole sensor, Convective heat transfer, Thermally developing flow",
author = "Stefano Soprani and {Just N{\o}rgaard}, Anders and Carsten Nesgaard and Kurt Engelbrecht",
year = "2018",
doi = "10.1016/j.applthermaleng.2018.06.034",
language = "English",
volume = "141",
pages = "887--897",
journal = "Applied Thermal Engineering",
issn = "1359-4311",
publisher = "Pergamon Press",

}

Design and testing of a heat transfer sensor for well exploration tools. / Soprani, Stefano; Just Nørgaard, Anders; Nesgaard, Carsten ; Engelbrecht, Kurt.

In: Applied Thermal Engineering, Vol. 141, 2018, p. 887-897.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Design and testing of a heat transfer sensor for well exploration tools

AU - Soprani, Stefano

AU - Just Nørgaard, Anders

AU - Nesgaard, Carsten

AU - Engelbrecht, Kurt

PY - 2018

Y1 - 2018

N2 - The exploration of oil, gas, and geothermal wells is moving towards increasingly harsher downhole environments, requiring more and more advanced drilling and intervention tools. The high downhole temperatures threaten the correct functionality of intervention equipment and of standard downhole electronics, which cannot withstand temperatures above 150 °C for an extended period of time. Thermal management of downhole electronics therefore requires critical and accurate knowledge of the thermal interaction between the downhole tools and the wellbore environment for correct tool design, intervention planning and operation. In this work, we present the design, modelling and testing of a sensor for downhole tools that can determine the heat transfer rate between the tool and the harsh downhole environment. An experimental flow loop was used to simulate the interaction between the sensor and the well fluid, and to calibrate the sensor in the range of heat transfer coefficients 0–1000 W/m2 K. Good agreement between model predictions and experimental results was obtained with average and maximum errors of ∼3% and ∼10%, respectively. A sensitivity of up to 8.7 mV/(W/m2 K) was measured and a response time of about 11 s was obtained over a 25% change in the fluid velocity.

AB - The exploration of oil, gas, and geothermal wells is moving towards increasingly harsher downhole environments, requiring more and more advanced drilling and intervention tools. The high downhole temperatures threaten the correct functionality of intervention equipment and of standard downhole electronics, which cannot withstand temperatures above 150 °C for an extended period of time. Thermal management of downhole electronics therefore requires critical and accurate knowledge of the thermal interaction between the downhole tools and the wellbore environment for correct tool design, intervention planning and operation. In this work, we present the design, modelling and testing of a sensor for downhole tools that can determine the heat transfer rate between the tool and the harsh downhole environment. An experimental flow loop was used to simulate the interaction between the sensor and the well fluid, and to calibrate the sensor in the range of heat transfer coefficients 0–1000 W/m2 K. Good agreement between model predictions and experimental results was obtained with average and maximum errors of ∼3% and ∼10%, respectively. A sensitivity of up to 8.7 mV/(W/m2 K) was measured and a response time of about 11 s was obtained over a 25% change in the fluid velocity.

KW - Downhole electronics

KW - Well interventions

KW - Downhole sensor

KW - Convective heat transfer

KW - Thermally developing flow

U2 - 10.1016/j.applthermaleng.2018.06.034

DO - 10.1016/j.applthermaleng.2018.06.034

M3 - Journal article

VL - 141

SP - 887

EP - 897

JO - Applied Thermal Engineering

JF - Applied Thermal Engineering

SN - 1359-4311

ER -