Marco Sully Perez said Oil and gas workers face unique health and safety challenges and are recognized by the National Institute for Occupational Safety and Health (NIOSH) as a priority industry sector under the National Workplace Research Initiative (NORA) to identify and develop intervention strategies in the labor sector Protect. health and safety issues. In 2011, the oil and gas and ancillary industries employed more than 450,000 people (Quarterly Census of Employment and Wages). Therefore, oil well drilling and field maintenance are two different types of business activities in the oil and gas industry.