CALCULATING THE STRENGTH OF DOUBLE CASING IN NON-SYMMETRY COLLAPSING STRESS

This paper discusses the stresses acting on double casing and the mechanics model. Two mechanics models of double casings, which contacted with formation completely and acted by symmetry collapsing stress,have been presented. The important results have been gotten by analyzing the solutions and the effects using double casing have been discussed. The concepts about effects factors of double casing and thick wall casing have been presented, which have shown that slurry rings have great effect on casing only using double casing with thin or middle thick wall.