FILE PHOTO: The exterior of the Schlumberger Corporation headquarters building is pictured in the Galleria area of Houston January 16, 2015. REUTERS/Richard Carson (UNITED STATES – Tags: BUSINESS ENERGY EMPLOYMENT)/File Photo
FILE PHOTO: The exterior of the Schlumberger Corporation headquarters building is pictured in the Galleria area of Houston January 16, 2015. REUTERS/Richard Carson (UNITED STATES – Tags: BUSINESS ENERGY EMPLOYMENT)/File Photo