Schlumberger Limited · Houston, TX United States ·(NYSE: SLB)

No sleeper, Schlumberger is one of the world's largest oil field services companies, along with Halliburton. The company -- whose name is more or less pronounced SHLUM-ber-ZHAY -- provides a full range of oil and gas services, including seismic surveys, drilling, wireline logging, well construction and completion, and project management. Organized into 31 geographic teams, Schlumberger's Oilfield Services unit provides reservoir evaluation, reservoir development, and reservoir management services. Schlumberger is also working to develop new technologies for reservoir optimization. Through its WesternGeco business, the company provides seismic services to customers worldwide. To read the full description, subscribe now.