That's not how it works .... each wells production will be trucked or flowlined to a central processing facility. From there, the export crude will need to meet a specification for BS&W (Basic Sediment and Water); salt content; sulphur content. The overall quality as far as API goes will be a blended amount and negotiated between Mart's marketing engineers and the customer at the custody transfer station. Sometimes the transfer point is at the plant gate; or the crude is not 'sold' until it is on a ship.
No worries at all about this API content. It is good news, will be blended, and processing facilities tweaked to handle - and all end up in the export line.
Basis Oilfield Processing and Handling 101, and I have 25+years experience in the business.