and if it washes ashore, you just collect it like seaweed.
Or just used as-is as a fuel in electric producing plants or anywhere else that needs a fuel
Steam engines on trains. Oops they don't use those anymore
Another idea is to use large suction machines to vacuum up the oil/water mix and then separate the two.
Empty tankers could be brought in to haul the mixture to shore.
Then the leaked oil could be refined and used same as if it was pumped out of the well.