Segmentation by type within the Mineral Oil Based Drilling Fluids market distinguishes four sub‑categories: straight mineral oil, oil‑in‑water (O/W) emulsions, semi‑synthetic blends, and additive‑enhanced formulations. Straight mineral oil, a pure hydrocarbon base, contributes approximately 35 % of market volume, favored for its simplicity and predictable rheology in low‑temperature environments. O/W emulsions, comprising dispersed oil droplets in an aqueous phase, capture about 40 % of the market; they deliver superior cooling and hole cleaning, making them the preferred choice for high‑rate drilling. Semi‑synthetic blends, which combine mineral oil with limited synthetic components, hold roughly 20 % of sales, offering a balance between cost and performance for moderate temperature wells. Additive‑enhanced formulations, incorporating polymers, surfactants, and corrosion inhibitors, represent the remaining 5 % and are deployed in niche scenarios requiring tailored fluid properties. The relative weight of each type directly shapes the overall market size by aligning product cost structures with the technical demands of each drilling application.