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Open access Oct 2026

Evaluation of Moderate Collapse Characteristics and Optimization of Drilling Fluid Density for Horizontal Wells in Deepwater Gas Fields

Conventional drilling fluid density design based on the onset of yielding may not adequately balance wellbore stability against the available mud-weight window in deepwater sandstone–mudstone interbeds, where collapse and lost-circulation risks coexist. Using three-pressure profiles, actual mud weights, and operational...

Cheng-Long Li, Xuan-Hua Zhu, Hao-Wei Feng et al. · 0 citations
Open access Oct 2026

Optimization and Emulsification Mechanism of a High-Density Solids-Free Drill-In Fluid System

Conventional solid-weighted drilling fluids suffer from particle settling under high-temperature and high-pressure (HTHP) conditions and easily induce irreversible reservoir pore damage, limiting safe drilling in deep HTHP reservoirs. To address these drawbacks, two solids-free water-in-oil emulsion drill-in fluid syst...

P. Xiao, Yu-Long He, Jiu-Yong Wei et al. · 0 citations

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