Schlumberger NV engages in the provision of technology for reservoir characterization, drilling, production, and processing to the oil and gas industry. It operates through the following business segments: Reservoir Characterization, Drilling, Production, Cameron, and Elimination and Other. The Reservoir Characterization Group segment consists of the principal technologies involved in finding and defining hydrocarbon resources. The Drilling Group segment includes the drilling and positioning of oil and gas wells such as bits and drilling tolls, drilling and measurement, land rigs, and integrated drilling services. The Production Group segment provides technologies in the lifetime production of oil and gas reservoirs such as well services, completions, artificial lift, well intervention, water service, integrated production services and others. The Cameron Group segment consists of the pressure and flow control for drilling and intervention rigs, oil and gas wells and production facilities. The company was founded by Conrad Schlumberger and Marcel Schlumberger in 1926 and is headquartered in Houston, TX.