Colombian oil producers in the Llanos Basin pump far more water than oil. The percentage of water they produce is going to get ever-more dramatic in coming years, as the oil runs lower and what is called “water cut” gets higher. State oil company Ecopetrol, which has some of the biggest llanos oilfields, is now trying all sorts of ways to turn that water into something useful, such as irrigating forage for cattle and irrigating water-hungry lumber trees. They are improving treatment for the water they dump into rivers and they recently built their first injection well.
They are pumping the water into a wet landscape, and the aquifer they are pumping from is so full of water that in decades of oil production in the area, the water pressure has dropped about 1%, according to engineers who briefed me and another reporter in August (yes, took me a while to post this). So this is not one of those cases where the environmental impacts are obvious and horrifying.