Mining of Mineral Deposits

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Damage to flexible pipes of coiled tubing equipment due to corrosion and fatigue: methods and approaches for evaluation

А. Syrotyuk1, О. Vytyaz2, J. Ziaja3

1Department of Physical Fundamentals of Fracture and Strength of Materials in Aggressive Environments, Karpenko Physico-Mechanical Institute of the National Academy of Sciences of Ukraine, Lviv, Ukraine

2Institute of Petroleum Engineering, Ivano-Frankivsk National Technical University of Oil and Gas, Ivano-Frankivsk, Ukraine

33Department of Drilling and Geoengineering, AGH University of Science and Technology, Krakow, Poland

Min. miner. depos. 2017, 11(4):96-103

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      Purpose. To propose an engineering approach for evaluating surface corrosion fatigue of flexible pipes of coiled tubing equipment, on the basis of the generalized data about corrosion fatigue behaviour of structural steels and ana-lysis of the existing methods and approaches for assessment of these phenomena.

      Methods. We applied the original method of corrosion fatigue study which takes into account the parameters of electrochemical dissolution of cyclically deformed surface in conditions of its deformation, as well as the known methods of fracture mechanics, corrosion science, electrochemistry and materials science.

      Findings. The stages of initial corrosion damaging and surface corrosion fatigue nucleation in structural steels were considered. The criterion ratio for evaluating the period of surface corrosion fatigue crack nucleation that relates the number of loading cycles before crack initiation, the corrosion current, the constants of electrochemical dissolution of metal surface to the cyclic loading parameters is derived. This criterion allowed to obtain and substantiate the experimental formula for predicting the number of loading cycles prior to the surface corrosion fatigue crack nucleation.

      Originality. The suggested new model describes the surface fatigue crack nucleation as a result of interaction between corrosion and operational cyclic loadings of the coiled tubing equipment flexible pipes.

      Practical implications. The proposed relationship for calculating macrocrack nucleation period is applicable for engineering assessment of serviceability and fracture risk of flexible pipes of coiled tubing equipment under assigned operating conditions.

      Keywords: coiled tubing equipment, flexible pipe, high strength low alloyed steel, corrosive environment, cyclic loading, number of loading cycles, damages, crack-like defect, crack growth rate, macrocrack nucleation period


Akid, R., & Miller, K.J. (1991). Short Fatigue Crack Growth Behaviour of a Low Carbon Steel under Corrosion Fatigue Conditions. Fatigue & Fracture of Engineering Materials and Structures, 14(6), 637-649.

Dmytrakh, I.M. (2001). On Corrosion Fatigue Initiation from Notches and the Local Corrosion Fracture Approaches. Notch Effects in Fatigue and Fracture, 331-346.

Dmytrakh, I., & Panasyuk, V. (1999). Vplyv koroziinykh seredovyshch na lokalne ruinuvannia metaliv bilia kontsentratoriv napruzhen. Lviv: Fizyko-mekhanichnyi instytut im. H.V. Karpenka.

Dmytrakh, I.M., Akid, R., & Miller, K.J. (1997). Electrochemistry of Deformed Smooth Surfaces and Short Corrosion Fatigue Crack Growth Behaviour. British Corrosion Journal, 32(2), 138-144.

Keddam, M., & Vieira da Silva, J. (1980). The Influence of Straining on the Anodic Behaviour of Iron in an Acidic Medium. Corrosion Science, 20(2), 167-175.

Larrosa, N.O., Akid, R., & Ainsworth, R.A. (2017). Corrosion-Fatigue: A Review of Damage Tolerance Models. International Materials Reviews, 1-26.

Liu, Z., Zheng, A., Diaz, O.O.R., & Hauglund, L. (2015). A Novel Fatigue Assessment of CT with Defects Based on Magnetic Flux Leakage. In SPE/ICoTA Coiled Tubing & Well Intervention Conference & Exhibition (pp. 1-10). The Woodlands, Texas, USA: Society of Petroleum Engineers.

Miller, K.J. (1993a). Materials Science Perspective of Metal Fatigue Resistance. Materials Science and Technology, 9(6), 453-462.

Miller, K.J. (1993b). The Two Thresholds of Fatigue Behaviour. Fatigue & Fracture of Engineering Materials and Structures, 16(9), 931-939.

Miller, K.J., & Akid, R. (1997). The Application of Microstructural Fracture Mechanics to Various Metal Surface States. Materials Science, 33(1), 1-20.

Murtaza, G. (1995). Modelling Short Fatigue Crack Growth in a Heat-Treated Low-Alloy Steel. International Journal of Fatigue, 17(3), 207-214.

Nasr-El-Din, H., & Metcalf, A. (2008). Workovers in Sour Environments: How Do We Avoid Coiled Tubing (CT) Failures? SPE Production & Operations, 23(02), 112-118.

Navarro, A., & Rios, E.R. de L. (1987). A Model for Short Fatigue Crack Propagation with an Interpretation of the Short-Long Crack Transition. Fatigue & Fracture of Engineering Materials and Structures, 10(2), 169-186.

Navarro, A., & Rios, E.R. (1988). A Microstructurally-Short Fatigue Crack Growth Equation. Fatigue & Fracture of Engineering Materials and Structures, 11(5), 383-396.

Padron, T., Luft, B.H., Kee, E., & Tipton, S.M. (2007). Fatigue Life of Coiled Tubing with External Mechanical Damage. In SPE/ICoTA Coiled Tubing and Well Intervention Conference and Exhibition (pp. 1-16). The Woodlands, Texas, USA: Society of Petroleum Engineers.

Panasyuk, V. (1991). Mekhanika kvazikhrupkoho razrusheniya materialov. Kiev: Naukova dumka.

Panasyuk, V. (2002). Strength and Fracture of Solids with Cracks. Lviv: Karpenko Physico-Mechanical Institute of the NAS of Ukraine.

Paris, P., & Erdogan, F. (1963). A Critical Analysis of Crack Propagation Laws. Journal of Basic Engineering, 85(4), 528.

Paris, P., Gomez, M., & Anderson, W. (1961). A Rational Analytic Theory of Fatigue. The Trend in Engineering, 13(1), 9-14.

Perry, K. (2009). Microhole Coiled Tubing Drilling: A Low Cost Reservoir Access Technology. Journal of Energy Resources Technology, 131(1), 013104.

Shaohu, L., Hui, X., Feng, G., Qifeng, J., Jiwei, W., & Ting, Y. (2017). Coiled Tubing Failure Analysis and Ultimate Bearing Capacity under Multi-Group Load. Engineering Failure Analysis, (79), 803-811.

Tipton, S., Carlson, G., & Sorem, J. (2006). Fatigue Integrity Analysis of Rotating Coiled Tubing. In SPE/ICoTA Coiled Tubing Conference & Exhibition (pp. 1-7). The Woodlands, Texas, USA: Society of Petroleum Engineers.

Turnbull, A. (1987). Corrosion Chemistry within Pits, Crevices and Cracks. London: Her Majesty’s Stationery Office.

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