Yes, what I think I said. 35% recovery is pretty good and it goes down from there. Lots of fields have had pressure maintenance or water flooding for decades. Some though, like areas of the East Texas Field that have never been unitized into very big blocks have had either no or very spotty and ineffective water floods.
Primary recovery really depends on the driving mechanism of the reservoir. modes of primary recovery involve depletion (low recovery), water drive (higher recovery), compaction drive (higher yet recovery in primary mode).
Recovery in cases where the gas cap is destroyed early and the oil becomes immobile and unrecoverable is usually dismal and lots of oil was wasted and for all practical purposes lost forever.
That has been one of the concerns with the proposed Alaskan Gas Pipeline. Some have explained taking the gas pressure down too early will result in lower total dollars for the state.