Companies operating in the Marcellus and Utica shales say it's been a challenge to fill openings in engineering, geology, environmental health and other professional fields.
The Marcellus Shale Coalition, a gas drilling-industry trade group, released a workforce survey Wednesday of more than 100 of its members.
The survey indicates that about half of the industry's new hires in 2012 were equipment operators or work in operations and maintenance.
Companies say professional and management jobs are the most difficult to fill.
The companies that took part in the survey say they plan to add 4,000 jobs in 2013.