Schlumberger has the know-how to get oil and gas drillers out of a slump. One of the world's largest oilfield services companies with scores of business units, it provides a full range of services, including seismic surveys, formation evaluation, drilling technologies and equipment, cementing, well construction and completion, and project management. Schlumberger also provides reservoir evaluation, development, and management services, and is developing new technologies for reservoir optimization. Through its WesternGeco business, the company provides seismic and other surveying services to customers worldwide. In 2016 Schlumberger acquired rival Cameron International in  a deal worth $14.8 billion.