North Sea data yield insight on fatigue life of drill pipe

Failure of drill pipe due to fatigue is very costly problem in the oil and gas industry. Inspection costs represent a very small amount in well planning, and yet regular inspection intervals can significantly reduce fatigue problems.Models used today can predict only about 20% of drill pipe life. Environmental conditions can change these predictions by significant amounts; predicted values seldom match with experimental values. This article provides an analysis of North Sea data regarding the effect of drilling parameters on the fatigue life of drill pipe.FatigueFatigue refers to changes in properties that can occur in metal due to repeated application of stresses or strains, although usu...

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