Good old salt water. It's a very consitent byproduct of oil production. Many resevoirs have salt water drive and many of the connate resevoirs contain salt water. Ideally it should be reinjected into formation to maintain the resevoir voidage/ pressure. In some/many cases fresh water is injected into resevoirs to maintain voidage/pressure. There are many different senarios here on production techniques but there irrelevant here. A salt water spill is many more times harmfull to the soil than a crude oil spill.
And yes, as depth increases the pump rod weight would make downhole electric pumps more efficient despite electrical line resistance losses. Maybe so even with shallower wells. But the same principle of solar cells versus wind power generated power source could still be debated.
I too like the windmill scenario. Somehow it seems to indicate simpicity, stability or consistency or maybe a way of life or something ???.
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