Yes. But. It isn't that they captured us, but we captured their market and locked them in. Now neither side has flexibility and both sides are screwed because some real estate people now control commodity trading rules.
The refinery has to already be set up to accept similar crude. Iraq, Saudi, Mexico, Venezuela, Ecuador, Colombia, Brazil, some of Russia.
A very rough approximation:
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For rule of thumb purposes to help understand this world, when the price difference between Maya and WCS is less than the cost of tolls to the Gulf +$2, WCS is worth more due to excess demand in the isolated market we serve (the Mid-West). When WCS is worth less than Maya-tolls-$2, then there is over supply or not enough transportation capacity to market.
There is a lot of heavy refining capacity in the world. Of course, a lot of the capacity is proximate to heavy production. Or is the USA. A very don't take this as gospel graph, but of general truths.
Heavy refining capacity (and hard to say about Singapore, I think they can but prefer not to source heavy)
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IF the USA would allow loading of Canadian crude in Texas, markets would rebalance to have a WCS price not discounted by the tariff much at all, only by the extra transportation premium on the imported crude to replace the Canadian crude, and the extra transportation on the Canadian crude compared to the delivery points for that foreign crude.
In that world, it is also very important to remember than while Canadian crude might end up with a 25% tariff, other world crude will have a 10% tariff. So the margin is 15%. And either the market will be efficient and most of that 15% will be eaten by American consumers and logistics companies, working around the tariffs, or inefficient (the Americans ban Canadian re-export but continue to allow American export), and another layer of hell breaks lose.