1
Chemicals for use in the construction, treating, servicing, completion and working of oil, gas, geothermal and water wells and cleaning of industrial facilities
7
Machines and machine tools; pumps, injectors, coiled tubing units, engines, transmissions, workover equipment, mudding equipment, cement mixers, centrifugal pumps, recirculating mixers, drills, motors, packers, liner hangers, landing nipples, hydraulic valves and controls, pneumatic valves and controls, wireline equipment, rotary sidewall coring equipment, blenders, sand feeders and conveyors, cementing, fracturing and acidizing tools, valve actuators, couplings, high pressure jetting apparatus, circulating tanks, dump bailers, perforators, fluid samplers, nitrogen and carbon dioxide units, filtration units, for use in well drilling and well working
9
Computer software for analyzing engineering, geological and geophysical data and electric apparatus for use in the control of machines, electrical gauges and control panels and sensors
37
Oil, gas and geothermal well drilling, cementing and pressure grouting services; construction and installation of pneumatic bulk handling systems comprised of pipes, tubing, couplings, pumps, blowers, filters, valves and electrical controls and switches
40
Oil, gas and geothermal well treatment, perforating fracturing, stimulating and plugging; treating of oil, gas and geothermal well workings
42
Engineering, geological estimations and research for others, all in the field of oil, gas and geothermal well drilling; testing analysis of oil, gas and geothermal well workings; and oil, gas and geothermal field exploration; design for others in the field of oil and gas well drilling operations using visualization and conceptual design software to provide computerized digital solutions and simulations for oil and gas well drilling operations; computer-aided exploration and seismic interpretation; computer programming and data conversion of computer programs; and computer system analysis, all for use in oil and gas well drilling operations