Production engineers monitor and evaluate the production and efficiency of an oil or gas well. They develop methods to improve extraction, oversee drilling activities and will determine the need for new or improved tools. One of their main responsibilities is to evaluate the flow between the reservoir and the wellbore. Production engineers monitor the entire production process and will design completion systems and select equipment that will increase production rates. Production engineers are usually petroleum engineers, however sometimes an engineer from a different discipline will be trained on production engineering tasks.