To extract natural gas, wells are dug to the depth of 5,500 to 6,500 feet, on average. In hydraulic fracturing, depths are usually around 7,000 to 8,000 feet. A small pit is dig next to the well, and then sediment is pumped into the rock 7,500 feet below. The fissures caused can run another 1,000 or so feet deeper than the well. Here is a diagram to show the depth in greater proportion:
In terms of maximum depths to produce natural gas, there’s one in Oklahoma at nearly 25,000 feet and I’m pretty sure there are natural gas producing wells in Wyoming of comparable depth.
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