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How long does it take for oil directional well engineers to learn?

Petroleum directional well engineer should study 1 year. Oil directional well engineers have to study 1 year to be familiar with the workflow and technical requirements of the oil industry. To become an oil directional well engineer requires at least 4 years of undergraduate study and 3 years of work experience, plus pre-job training and certification examination, and the whole process may take more than 6 years.