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The first oil well were 800 ft. deep holes, dug using bits on the tips of Bamboo stalks in China.
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William Johnson reported Native American practices of skimming oil. Oil skimming is a method for seperating water from oil.
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This is a method of drilling, used for breaking the hard rock at the bottom using a blunt bit. The bit is suspended by a cable and takes continuous blows to the rock.
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Steam-powered cable-tools drilled faster and deeper. This Method, found in Appalachia, was usually used for brine wells.
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modern rotary rigs can drill miles into the earth and extract excessive amounts of oil.
