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Oil and Gas Wells

"Oil or gas wells may range in depth from a few hundred to more than 20,000 feet. A well is made by drilling a hole, called a "well bore", into the earth. Metal pipe, called "casing", is placed in the well bore and cement is pumped through it. When the cement reaches the bottom of the casing, it is forced out around the end, and pushed to the surface between the outside of the casing and the well bore. This critical layer of cement bonds the casing to the well bore. It protects oil, gas and underground water resources, keeping them from moving freely into and out of the well to mix with -- and contaminate -- each other."

Above graphic and quote taken from web site of California Dept. of Conservation, Oil, Gas & Geothermal Resources.



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