Doesn’t the Mexican Constitution prohibit foreign involvement in their petroleum industry, which is why their big oil field (Cataral?) is running down?
There has been talk of changing that.
Guest Commentary: Mexico’s energy market benefits with foreign investment
http://fuelfix.com/blog/2013/09/22/guest-commentary-mexicos-energy-market-benefits-with-foreign-investment/
But then it has been talked about for a very long time.
The Cantarell Field has been in production for over 3 decades. While they have some enhanced oil recovery and more will certainly be done, production rates are going to decline. It isn’t a magic fountain, it will not last forever at it’s peak flow rate.