Impact of Microannulus on the Heat Exchange at the Bottomhole

Livio Santos, Arash Dahi Taleghani

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Every injection and production operation are accompanied by heat transfer between the wellbore fluids and the formation. Often these fluids are only circulated inside the wellbore. However, the presence of microannulus, besides compromising wellbore integrity, could have a negative impact on the rate of heat transfer to and from the formation. Thermal conductivity could be critical in CO2 sequestration, thermal EOR and specially closed-loop geothermal wells. This study aims to evaluate the impact of microannulus on the heat exchange rate at the bottomhole by combining numerical results and field measurements. We propose to identify presence of microannulus by analyzing distributed temperature sensing (DTS) measurements acquired at different times from EOR and closed-loop geothermal wells. In a DTS system, temperatures are recorded continuously along an optical sensor cable placed in the wellbore. The analysis is combined with numerical simulations considering different operational conditions to estimate the severity of the microannulus. In extreme cases, the presence of microannulus was found to decrease the bottomhole temperature in 2.5%. The results also highlight the importance of proper cementing design to ensure wellbore integrity and avoid heat loss.

Original languageEnglish (US)
Title of host publicationSociety of Petroleum Engineers - SPE Annual Technical Conference and Exhibition 2022, ATCE 2022
PublisherSociety of Petroleum Engineers (SPE)
ISBN (Electronic)9781613998595
StatePublished - 2022
Event2022 SPE Annual Technical Conference and Exhibition, ATCE 2022 - Houston, United States
Duration: Oct 3 2022Oct 5 2022

Publication series

NameProceedings - SPE Annual Technical Conference and Exhibition
ISSN (Electronic)2638-6712


Conference2022 SPE Annual Technical Conference and Exhibition, ATCE 2022
Country/TerritoryUnited States

All Science Journal Classification (ASJC) codes

  • Fuel Technology
  • Energy Engineering and Power Technology


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