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Technology
Assessment & Research (TA&R) Program
| Project Number |
602 |
| Date of Summary |
July 27, 2009 |
| Subject |
Cement Fatigue and HPHT Well Integrity with Application to Life of Well
Prediction |
| Performing Activity |
Texas Engineering Experiment Station (TEES) |
| Principal Investigator |
Catalin Teodoriu and Jerome Schubert |
| Contracting Agency |
Minerals Management Service |
| Estimated Completion |
Completed |
| Description |
The objective of this project is to develop a better
understanding of the performance of the casing-cement bond under HPHT well
conditions leading to a model to predict well life.
Project Goals:
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Description of the importance of cement fatigue to the
life of HPHT wells
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Lab procedures and prototype test cell to measure the
performance of cement in cyclic loading under HPHT conditions
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Model to predict life of HPHT wells
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Recommendation for further work
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| Progress |
Fatigue failure in cement occurs when microscopic damage within the
microstructure of the cement, caused by initial cyclic loading, turns into
macroscopic cracks under gradually increasing loads. Cyclic loading impacts
initial damage and if loading is continued at load ratios above the critical
ratio for a particular cement mix, failure is imminent, but may undergo many
cycles when loaded below this ratio. Loading conditions may affect the
fatigue property of cement only when the mechanical properties are such as
to withstand static loading. Designs based solely on static loading
conditions may or may not be enough to ensure long term integrity depending
on prevailing down-hole conditions, thus the need to take the analysis
further by also examining the effect of fatigue. |
| Report |
| AA
(1,656 KB PDF) |
Offshore Technology Research Center "Cement Fatigue and HPHT Well Integrity with Application to Life of Well Prediction" Final Report. December 2008. |
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