If their was sufficient pressure to bring the oil all they to the top wouldn’t still be in production? Wha?
A well that produces 1 barrel of oil per week, and 20 gallons of water per day is going to be shut down. It is a constant expense, the disposal cost will exceed the oil production cost.
It isn’t about making oil, it is about making money.
But a barrel of oil a week leaking into your drinking supply is a really bad thing.
Also keep in mind, it doesn’t need enough pressure to lift oil from the reservoir. It just needs enough to get to the bottom of the well. Being lighter that water it will rise in the well column through the water.