The Production Revenue Standards Act shall apply to all owners and shall apply to all producing wells, regardless of the date pooled, drilled or of the date of the underlying leases; provided, however, that Sections 4, 5, 6, 7 and 8 of this act¹ shall not apply to wells in common sources of supply under unitized management pursuant to Section 287.1 of Title 52 of the Oklahoma Statutes or where royalty remittance is otherwise provided by written agreement among all owners in a well.