Monitoring of a reverse cement job in a high-temperature geothermal environment

Martin P. Lipus*, Thomas Reinsch, Tobias B. Weisenberger, Steinar Kragset, Ari Stefánsson, Sigurdur G. Bogason

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Cementing operations in wellbores, especially for long casings, are often challenging and prone to deficiencies when not properly planned and executed. While exploring for and exploiting of geothermal resources at temperatures above the critical point of water was attempted in different drilling projects in recent years, the well design, and especially the procedure to run and cement long production casings became a key challenge for drilling engineers. For the first time, a reverse cementing job for a 2.97 km long production casing in a high-temperature geothermal well could be monitored and analyzed using a combination of permanently installed distributed fiber optic and electronic sensors as well as conventional well logging equipment. Data from the permanently installed sensors were used to monitor and evaluate the cementation process as well as the onset of the cement hydration. Based on the data, the understanding of downhole fluid dynamics during cementation could be improved. Our analysis suggests that the cement was diluted during cement placement and partly lost into the formation. These findings can help to better prepare for future drilling ventures under similar downhole conditions.

Original languageEnglish
Article number5
JournalGeothermal Energy
Volume9
Issue number1
DOIs
Publication statusPublished - 18 Feb 2021

Bibliographical note

Publisher Copyright:
© 2021, The Author(s).

Other keywords

  • Distributed temperature sensing (DTS)
  • Iceland deep drilling project (IDDP-2)
  • Well cementing
  • Well integrity

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