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    • Features of drilling an exploratory and production well 

      Dayyabu, Abubakar Janmutum; Rastsvietaiev, Valerii (2023)
      An exploration well is drilled to a depth of 9,000 feet or more. Wells from 12,000 to 18,000 feet deep are being drilled to study in detail the geological structure of the earth's crust, the productivity of the field and ...