The dudes with the spears are why you need to invest in morebarge capacity. With over 3 billion dollars coming your way in the next decade, the amount needed to secure barge capacity for 20-25,000 bopd is miniscule.
And with the billions coming in, give the 20 biggest dudes with the spears jobs raking leaves or killing snakes or something. Lots of leaves and snakes in the jungle. Pay them far more than what anyone around their makes, and they will make sure every last drop of oil gets to where it needs to go. Also foods banks and stuff for the communities. High profile stuff, jobs and food.... by pass the gov't apply the money to the community directly. It works out to a tiny tiny amount to what's at's stake. They have nothing, so why not help them out. Be generous.
In case that doesn't work...might want to invest in a few machine guns too. Or perhaps hand-crank gatlin guns to give the dudes with the spears a fighting chance