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Lightweight Design and Running Friction Comparison of Titanium Alloy Casing in Extended-Reach Horizontal Wells
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Lightweight Design and Running Friction Comparison of Titanium Alloy Casing in Extended-Reach Horizontal Wells
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Journal Article
Lightweight Design and Running Friction Comparison of Titanium Alloy Casing in Extended-Reach Horizontal Wells
2025
Overview
To address the challenges of high running friction and limited depth extension caused by the heavy weight of traditional carbon steel casings in extended-reach horizontal wells, this study conducts a comparative analysis of titanium alloy and carbon steel casings using WellLead drilling software in a deep-water shallow-soft formation well (with a water-to-vertical ratio of 2.36 and maximum dogleg severity of 15°/30m). The friction sensitivity curve model reveals that the titanium alloy casing reduces static hook load by 13.2% (73 kN), significantly mitigating pipe sagging risks. Notably, under a high external friction co-efficient of 0.6, the titanium alloy casing achieves a hook load margin of 142.6 kN—107% higher than that of carbon steel casing (68.7 kN), thereby fully avoiding critical running failures. Simulation of a 5,000-meter lateral section demonstrates that the titanium alloy casing extends the maximum running depth by 2.4% (high friction: 0.6) to 27.4% (low friction: 0.6) compared to carbon steel. Field tests confirm superior running stability of titanium alloy casings in irregular wellbores, though wellbore reconditioning remains necessary for localized obstructions. This study quantifies the relationship between lightweight design and friction sensitivity, providing a reliable basis for casing selection in complex horizontal wells. Future research should also examine potential risks of titanium alloy casings, particularly weldability and long-term durability.
Publisher
IOP Publishing
Subject
