Don't really know much about it, but a lot of current oil pumping involves putting water and special sand down into the rock layers, to force the oils up and out.
So, kinda doing what you say.
A few billion barrels of oil is a drop in the bucket, not noticeable compared to the oceans and water available on this planet.
A lot of the sink holes come from limestone regions, where water over time carries away the limestone, as it very very slowly erodes from the underground water.
In certain cases underground mining and oil drilling clearly has caused the ground to cave in, of course. But most of what you hear is from limestone. If you see that house that is in the news, falling in a river, some speculate that an underground sprinkler system was enough to wet through and crack the limestone under the house.... Tho, to most of us it just looks like bad planning!
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Today's Featured Article - Tractor Generators - by Chris Pratt. As a companion to the articles on three-brush and two-brush generators, it seemed fitting that we should provide our readers with a description of how a generator works in lay terms. The difficulty with all those "theory of operation" texts is that they border on principles of electricity or physics and such. Since I know nothing of either, you will have to put up with looking at the common sense side of how generators work which means we "
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