Oilfield Services

Grey Wolf serves major and independent oil and gas companies with a fleet of nearly 130 rigs. The company offers contract oil and gas land drilling services in the United States. Located in one of the nation s most prolific natural gas regions, the company s operating divisions include south Texas, Gulf Coast, Ark-La-Tex and Mississippi/Alabama areas, west Texas and Rocky Mountains. Approximately 95 percent of the wells it drills on a day work and turnkey basis are targeted to natural gas. Grey Wolf is located in Houston.

Founded in 2003, MicroSeismic Inc. operates as a geophysical company providing innovative microseismic monitoring and passive seismic imaging services to the energy industry. Based in Houston, Texas, it offers real-time monitoring and mapping of hydraulic fracture operations for the development of unconventional oil and gas plays. The company has expertise in monitoring microseismic activity utilizing surface and near-surface arrays. It also offers other services, such as geophysical data processing/analysis, reservoir monitoring as well as geological interpretation.

Schlumberger is one of the world's leading oilfield service businesses that offers technology, information solutions and integrated project management services that optimize reservoir performance for customers in the oil and gas industry. The company provides a wide range of products and services, including seismic acquisition and processing; formation evaluation; well testing, directional drilling, well cementing and stimulation; artificial lift and well completions; consulting; and software and information management. Its water services division specializes in assessing, developing and managing groundwater resources worldwide. Schlumberger employs more than 80,000 people in nearly 80 countries worldwide. The company operates in excess of 20 research and engineering facilities worldwide. It has operated for more than 80 years and is based in Houston. Schlumberger is publicly traded on the New York Stock Exchange under the ticker symbol SLB.