2000•Drilling & Production TechnologyRequires access

Analysis of fatigue life of bending coiled tubing

Zhu Xiao

Abstract

Coiled tubing(CT) life is very short,which is main fact to affect cost of CT services.Based on theory of fatigue strength and plasticity,coiled-tubing-life is analysed when coiled tubing is bent,and CT life affected by reel radius and coiled tubing size discussed.The result shows that because life analysis of bending coiled tubing is a fatigue problem with fewer cycles,coiled tubing life is not long.In order to increase coiled tubing work time,the structure in coiled tubing system is improved without gooseneck.

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Key concepts: Coiled tubing, Bent molecular geometry, Bending, Bend radius, Structural engineering, Materials science, Fatigue testing, Engineering