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injection well
An injection well is a device that places fluid deep underground into porous rock formations, such as sandstone or limestone, or into or below the shallow soil layer. The fluid may be water, wastewater, brine (salt water), or water mixed with chemicals.〔(【引用サイトリンク】 url=http://www.epa.gov/safewater/uic/basicinformation.html )〕
==Definition ==
The EPA' Underground Injection Control defines an injection well as "a bored, drilled, or driven shaft, or a dug hole that is deeper than it is wide, or an improved sinkhole, or a subsurface fluid distribution system".〔
Its construction depends on the injection fluid injected and depth of the injection zone. Deep wells injecting hazardous wastes or carbon dioxide deep below the Earth's surface have multiple layers of protective casing and cement, whereas shallow wells injecting non-hazardous fluids into or above drinking water sources are simply constructed.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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