METHOD AND SYSTEM FOR FATIGUE ANALYSIS ON OFFSHORE DEEPWATER DRILLING CONDUCTOR OR SURFACE CASING
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United States of America Patent
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Issued Date -
Jun 27, 2024
app pub date -
Dec 26, 2023
filing date -
Dec 27, 2022
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Abstract
The present disclosure relates to a method and system for fatigue analysis on an offshore deepwater drilling conductor or surface casing. The method includes: obtaining a dynamic soil reaction curve of soil where a conductor or a surface casing is mounted, with consideration of a cyclic decline effect; obtaining a stress response time-history of a hot spot position of the conductor or the surface casing under a dynamic load in each direction, thereby forming a first stress response time-history; obtaining a stress response time-history of the hot spot position of the conductor or the surface casing coupled with a soil reaction under the dynamic load in each direction in combination with the dynamic soil reaction curve and the first stress response time-history, thereby forming a second stress response time-history; and performing fatigue life prediction on the surface casing or the conductor by using the second stress response time-history.
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