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Open access Oct 2026

Safety Evaluation of Tubing Strings Under Extreme Fracturing Conditions in Ultra-Deep Wells

High pumping pressures and injection rates during acidizing and fracturing can threaten wellbore integrity in ultra-deep wells. Transient loads caused by abnormal events such as bottomhole blockage further increase the risk of tubing-string failure. This study develops a transient water-hammer model to describe pressur...

Chuan-Lei Wang, Yu Sang, Xiang-Kang Liu et al. · 0 citations
Open access Sep 2026

Influencing Factors on Internal-Pressure Capacity, Collapse Resistance, and Fatigue Life of Coiled Tubing During Field Operations

Coiled tubing is subjected to internal-to-external pressure differentials and repeated bending during field operations, while ovalization and cumulative fatigue damage progressively compromise structural integrity. To address inconsistencies among pressure-capacity and fatigue models and the simplified treatment of ova...

Huan-Cai Fan, Yu Sang, Zheng Li et al. · 0 citations

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