Construction of facilities, structures, living quarters, and utility buildings, production modules and subsea modules in the oil and gas industry; Construction of structures for the production of crude oil; Construction project management services; Construction project management services in the field of construction of offshore oil and gas facilities; Consulting services in the field of offshore oil and gas facility construction; Crane rental and leasing for construction purposes; Drilling of deep oil or gas wells; Drilling of deep oil or gas-wells; Drilling of deep oil wells; Drilling of oil wells; Drilling of wells; Extraction of oil; Extraction of oil and gas; Installation and maintenance of fire alarm, detection and suppression systems; Machinery installation; Machinery installation, maintenance and repair; Machinery maintenance and repair; Oil and gas drilling; Oil and gas industrial machine cleaning services; Oil pumping; Oil pumping and extraction; Oil well casing, tubing, and drill pipe installation; Pump repair and maintenance; Rental of oil well drilling tools; Technical consulting related to the installation of oil and gas equipment, control systems, and machinery; Well improvement services, namely, hydraulic fracturing of subsurface geologic formations to enhance well production; Wirelining for oil wells