Global Oilfield Process Chemicals Market By Type (Drilling Fluids, Cementing Chemicals, Workover and Completion Chemicals, Enhanced Oil Recovery Chemicals, Stimulation Chemicals, and Production Chemicals), By Application (Drilling Fluid, Well Stimulation, Enhanced Oil Recovery (EOR), Cementing, and Workover and Completion), By Region, and Key Companies - Industry Segment Outlook, Market Assessment, Competition Scenario, Trends and Forecast 2019-2028