Core Laboratories, 6316 Windfern Rd, Houston, TX 77040, US

Weatherford International is one of the world s largest diversified upstream oilfield service companies. With a corporate history that began in 1941, Weatherford has nearly $4.6 billion in annual revenues, approximately 24,500 employees in nearly 100 countries and more than 85 manufacturing facilities supporting 730 service bases. In 2005, Standard & Poor s announced the addition of the company to its flagship S&P Index. Following the completion of its 2005 acquisition of Precision Drilling Corporation's energy services and international drilling divisions, Weatherford was reorganized into four distinct businesses that include completion and production systems; evaluation, drilling and intervention; pipeline and specialty services; and international contract drilling. The company provides a variety of services to its customers that include drilling, evaluation, completion, production, intervention and industrial services. Weatherford International has locations throughout the United States, such as the office in Houston.