Schlumberger Limited is the world's largest oilfield services corporation operating in approximately 80 countries, with about 80,000 people of 140 nationalities. Schlumberger supplies a wide range of products and services from seismic acquisition and processing to formation evaluation, well testing and directional drilling, well cementing and stimulation, artificial lift, well completions and consulting, and software and information management. Schlumberger also provides similar products and services for the groundwater industry. Operating revenue in 2008 was US $27.16 billion with a market capitalization as of October 17, 2008, of US $59.3 billion.

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