...-linear reduction of burst strength of casing worn by drillstring may be needed for sour service well conditions, to prevent an "earlier" casing burst on sulfide stress cracking. spe 94304 rupture burst strength maximum hoop stress wall section linear reduction wall thickness external pressure...

... ABSTRACT This paper describes a simple method of evaluating the collapse strength and post collapse behaviour of oil field tubulars subjected to external pressure. The method is based on elastic ovalisation and subsequent plastic collapse by formation of a four-hinge mechanism. The resulting...