油井管の大圧縮軸応力下での圧潰圧力の計算式

概要

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Problems such as casing collapse and so on are apt to occur in a steam injection well for enhanced oil recovery, since the well casing is subjected to compressive axial stress more than the yield stress of the material at the elevated temperature during the steam injection. However, the collapse pressure has not been evaluated under the excessive compressive axial stress. We conducted collapse tests under the axial stress state and derived an empirical collapse pressure formula considering expansion of the outside diameter of the casing and work-hardening of the yield stress due to the excessive axial stress. As estimate by the derived formula can give moderately accurate coincidence with experiment, so estimation of collapse pressure be ready in whole axial stress state including previously proposed formulas under ordinary and excessive tensile axial stress states.
一般社団法人日本機械学会の論文
2004-12-25