Abstract
Under the condition of nitrogen drilling and blowout in an oilfield, the high-speed gas carried cuttings to the wellhead equipment, causing erosion and wear damage to different degrees, especially the erosion and wear of the wellhead four-way bypass. To explore the erosion wear law of the wellhead four-way and slow down the wear rate, based on the erosion failure mechanism of gas–solid two-phase flow, this paper uses the CFD simulation software to establish a wellhead four-way fluid domain model and analyzes the erosion and wear causes of the four-way bypass. And studying the erosion and wear law of the wellhead four-way bypass under different gas blowout amount, cuttings mass flow rate, cuttings diameter and cuttings density. Then, the erosion resistance of Ni60, Ni45 and Inconel625 coating materials was analyzed through experimental research, and the erosion resistance coating on the inner wall of the wellhead four-way was optimized. The results show that: (1) With the increase of natural gas emission amount, cuttings content, and cuttings diameter, the bypass erosion rate increases; the cuttings density has no obvious effect on the erosion rate; (2) The coating material with the strongest erosion resistance is Inconel625, followed by Ni45, and Ni60 has the worst erosion resistance.
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Yunda, Y., Xiaolan, Z. & Yang, Y. Study on Erosion Wear Law and Anti-Erosion Ability Optimization of Wellhead Four-Way. J Fail. Anal. and Preven. 23, 234–244 (2023). https://doi.org/10.1007/s11668-022-01548-w
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DOI: https://doi.org/10.1007/s11668-022-01548-w