I think you Javis misunderstood something. To clear things:
If you connect multiple goods producers to one city they will compete.
If you connect multiple goods producers each to different city that will work fine.
And similiarly if you connect many wells to one refinery those wells will compete and hurt each other.
But you can connect many wells each to different refinery and that will work fine.
Of course every time the production chain must be complete: resource extractor -> goods producer -> city