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A 200°C‐Tolerant Water‐Based Drilling Fluid for Ultra‐Deep Wells Using an Organic–Inorganic Multi‐Metal Hydroxide Modifier

ABSTRACT A water‐based drilling‐fluid (WBDF) formulation was developed for moderate‐density ultra‐deep intervals requiring thermal stability at 200°C. The optimized formulation contained 5 wt% APEG/sodium‐citrate‐modified quaternary Mg‐Al‐Fe‐Zn multi‐metal hydroxide (ASMH), 0.3 w...