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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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