Document Type : Research Paper


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Column final test facing new challenge, in addition to casing burst/collapse limitations; buckling occurrence creates serious problems. Practically, in case of slight gap between mud and slurry densities, buckling initiation is inevitable. Casing elongation, bending and buckling detailed, to define column behavior while testing. Buckling influences on slurry pointed out too, and compared to column without test. New cement quality indicator is proposed, tested and validated via logging of wells drilled in different regions. Results generalized to cover other situations rather than heavy sections. Gas migration region, depleted reservoir, weak zones are all examined. Registrations confirm the appearance of buckling either while pumping slurry or pressure testing. New modified casing selection method conjointly with updated numerical technique proposed to prevent buckling. Experimental and simulation findings confirm the reliability of the proposed technique.


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