They did it right. Their currency have no value.
But Oil has a value. They are just tokenizing their oil and hence making it free from the fluctuation of their currency.
This way they'll profit, their customer will profit and the only one at law is the tyrannic rule of IMF.
That's why they choose to adopt the blockchain and they have the petrocoin- trumps hate it that's why they ban to petro oil to enter there vicinity. Not sure what will happen next.