Document Type : Research Paper
Author
Ph.D., Instructor, University of Badji Mokhtar Annaba (UBMA), Boukarma, Algeria.
Abstract
Column final tests face new challenges, and in addition to casing burst/collapse limitations, buckling occurrence creates serious problems. In case of a slight gap between mud and slurry densities, buckling initiation is inevitable. Casing elongation, bending, and buckling are detailed to define column behavior while testing. Buckling influences on slurry are mentioned and compared to the column without test. A new cement quality indicator is also proposed, tested, and validated via logging of wells drilled in different regions. The results are generalized to cover other situations rather than heavy sections. Further, gas migration regions, depleted reservoirs, and weak zones are all examined. Registrations confirm the appearance of buckling either while pumping slurry or pressure testing. A new modified casing selection method conjointly with an updated numerical technique is proposed to prevent buckling. Moreover, the experimental and simulation findings confirm the reliability of the proposed technique.
Highlights
- Buckling generation during column cementing is detailed;
- Buckling while testing the critical parameters of the column is proposed;
- Influences of buckling on the cement behind casing quality and cracking of previous column cement are all investigated;
- Casing elongation, Von Mises theories, and a new characteristics selection strategy are directed to indicate the merit of the proposed method.
Keywords
Main Subjects
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