Oil-based drilling fluid used in servicing of oil and gas wells; oil-based drilling fluid used in exploratory and production drilling for oil and gas wells

Maintenance and repair of oil and gas wells; oil and gas well casing; perforating services for oil and gas wells; Perforating services, namely, perforation of oil and gas wells; Consultation in the use of drilling fluids for oil and gas well drilling

Well logging and surveying; geological surveys or research, namely, analysis, testing, and sampling of geological formations; monitoring the performance of drilling fluid