Nonuniform loading affects casing collapse resistance

New equations developed by the Southwest Petroleum Institute, China, can calculate collapse resistance pressure for casing under nonuniform loading conditions. Click here to view EquationsThis survey is in PDF format and will open in a new windowA previous article by the authors dealt with the effects of casing imperfections on collapse resistance (OGJ, Jan. 22, 2001, p. 44-47). The present article is a continuation, examining how stresses in the earth affect casing collapse resistance.Research indicates that nonuniform loading reduces casing collapse resistance to as low as 15-30% of the collapse resistance of uniformly loaded casing. To reduce the possibility of collapse, casing design...

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