Oregon Revised Statutes Public Lands § 274.810

Subject to the lessee's right to surrender, the lessee shall commence operations for the drilling of a well within five years from date of the lease and commence production within three years of discovery of oil, gas or sulfur in paying quantities, unless the Department of State Lands shall have, for cause, granted an extension of time for such act. In addition, the lease shall have such exploratory, drilling and producing requirements as the Department of State Lands in consultation with the Department of Geology and Mineral Industries deems necessary to encourage the exercise of due diligence on the part of lessee.