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How much money do they get per gallon? And how much gallons are being shipped?

Lots, though China always seems to get theirs on time, the same can not be said for Russia.

Venezuela has struck oil-for-loans deals with China and Russia, and those countries together have lent Venezuela at least $50 billion in exchange for promised oil and fuel deliveries.

https://www.cnbc.com/2017/05/26/why-the-venezuelan-government-is-throwing-its-people-under-the-bus.html

I just learned something thats interesting:

Lastly, Venezuela won't default on its debt because "many high-ranking government officials and their associates are bondholders," said Moya-Ocampos of IHS, who noted it's "not too common" for high-ranking officials to own their country's debt.