Oilfield Chemicals Market [By Product Type (Drilling Fluids, Simulation Fluids, Completion & Work Over Fluids, Cement Slurries); By Application Type (Production Chemicals, Simulation Fluid Additives, Drilling Fluid Additives, Cement Additives, EOR Products, Completion & Work Over Fluid Additives); By Regions]: Market size & Forecast, 2017 – 2026