Oilfield Chemicals Market Segmentation By Product (Biocides, Corrosion & Scale Inhibitors, Demulsifiers, Surfactants, Polymers, Gellants & Viscosifiers, and Others); By Application (Drilling Fluids, Cementing, Enhanced Oil Recovery, Production Chemicals, Well Stimulation, and Workover & Completion) - Global Demand Analysis & Opportunity Outlook 2027