ZN

Drilling for crude oil; Drilling of deep oil or gas wells; Drilling of oil wells; Extraction of natural gas; Extraction of oil

Exploration and searching of oil and gas; Gas exploration; Geophysical exploration for the oil industry; Oil and gas well drilling services, namely, providing measurements and downhole telemetry while drilling; Oil exploration; Oil field exploration; Oil field surveying; Oil prospecting; Oil prospecting, namely, well logging and testing; Oil well testing; Oil-field surveys