There is a snowballs chance in Hell that Maduro will lose.
He has banned the most popular candidates and parties.
His only legitimate threat is a former PSUV party member (but faithful Chavista) Henri Falcon who is perhaps more despised than Maduro. Should he win (a miracle), nothing would change.
He has in place at each polling station "Red Spots", where the voter is required to show their Chavismo Loyalty Card in order to get a voucher for food.
And in neighborhoods where there isn't a lot of Maduro voters, he has in the past moved the polling stations to neighborhoods that are in very rough areas where his "colectivos" (red shirt thugs) work their magic.
Maduro has "predicted" that he will win with over 10 million votes in a country with 90% poverty level and 18,000% inflation. Not too shabby for what was once the wealthiest country in all of Latin America.
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In regards to oil prices: OPEC has seen a drop in output and a subsequent increase in the price of a barrel of oil due to the collapse of Venezuela oil production. The oil production in Venezuela is approaching 1960's levels. But, Venezuela won't see a dime because over 1/2 of the oil it does pump out goes to paying debt to China and Russia. The rest is low quality "heavy sour" that needs diluants that are expensive (it has to be imported), and now they are in the middle of losing their assets (Conoco Phillips just seized their refinery in Curacao.) All of its oil is now paid for up front (at a huge discount) so that it can't be seized by debt holders.