The plastic bending that occurs at surface causes large residual stresses in coiled tubing (CT) as it is run in and out of a well. When an axial force is applied to the CT it stretches more than pipe which has never been bent. Thus the conventional stretch calculations often used are incorrect for CT applications. This paper presents equations which model the elastic/plastic stretch of CT. The results from these equations are compared to a computer model which was developed based on CT elongation research. This paper also proposes a method to be used for stuck point depth calculations which avoids the plastic stretch complication.
Coiled-tubing stretch and stuck-point calculations
1999
10 Seiten, 3 Quellen
Conference paper
English
SAE Technical Papers | 1960
Coiled tubing and vessel motions for riserless coiled tubing systems
Tema Archive | 2004
|