Eirik Karstad, Bernt S. Aadnøy
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The misinterpretation of well bore signals, especially those concerning drilling-fluid temperatures and volumetric expansion, has been identified as a key problem when drilling high-pressure, high-temperature (HPHT) wells offshore Norway.
Several severe incidents have occurred over the past 8 years, the worst case being an underground blowout that took 1 year to control.
The aim of this article is to show how to derive exact temperature information from a well during drilling and circulating operations so that more-accurate information ca...