Global Specialty Oilfield Chemicals Market By Type (Drilling Fluids, Cementing, Conpletion, By Application Stimulation, and Production & Delivery)&(Drilling Fluids, Cementing, Completion & Stimulation, Production & EOR (Enhanced Oil Recovery Chemicals), and Delivery), By Region and Key Companies - Industry Segment Outlook, Market Assessment, Competition Scenario, Trends and Forecast 2019–2028