Tubular imperfections pose design problems in short, ultrashort radius wells

With the emergence of short and ultrashort-radius horizontal wells, tubular failures have become increasingly common. Such wells encounter severe bending stresses that well designers may not have considered when calculating tubular collapse strength.This article demonstrates that a finite-element model can calculate the stresses acting on out-of-round tubulars and assess oval casing collapse-strength resistance.In severe doglegs, the oil and gas industry has observed that oil field tubulars collapse at pressures considerably less than API's recommended procedures would predict. The API procedures do not account for casing deformation.In short and ultrashort-radius wells, casings that ...

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