Oil-based mud (OBM), commonly used in the drilling industry, consists of oil as the continuous phase and water as the dispersed phase, along with various additives like emulsifiers, wetting agents, and viscosifiers. While primarily used for drilling purposes, OBM residues can interact with cement and concrete in structures like oil wells and offshore platforms. Understanding how these interactions affect the properties of cement and concrete under severe conditions is crucial for ensuring the structural integrity and longevity of such constructions.