over one million abandoned and active oil and gas wells that produced crude oil mixed with brines and water/mud mixtures;
(one million abandoned and active oil and gas wells; produced; crude oil mixed with brines and water/mud mixtures) (crude oil; mixed; with brines and water/mud mixtures)
one million abandoned and active oil and gas wells crude oil
produced mixed
crude oil mixed with brines and water/mud mixtures
with brines and water/mud mixtures