Coiled tubing

Development of Improved High-Strength Coiled Tubing

Today, there is a need for higher-strength coiled-tubing (CT) grades with better resistance to severe environments and better fatigue performance in both the tube body and the bias weld.

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Fig. 1—Ultimate tensile strength (UTS) vs. yield strength (YS) for base-tube and bias-weld tensile tests.

Today, there is a need for higher-strength coiled-tubing (CT) grades with better resistance to severe environments and better fatigue performance in both the tube body and the bias weld. A complete redesign of CT technology and its manufacturing process has recently been carried out. Testing has shown that the fatigue life of the new CT grades exceeds that of currently available high-strength grades. Additionally, the bias-weld fatigue life has improved significantly.

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