borehole -
A hole bored into the ground to collect samples for analysis or to extract oil or water.
Wikipedia
A borehole is the generalized term for any narrow shaft bored in the ground, either vertically or horizontally. A borehole may be constructed for many different purposes, including the extraction of water or other liquid or gases, as part of a geotechnical investigation or environmental site assessment, for mineral exploration, for temperature measurement, or as a pilot hole for installing piers or underground utilities. Boreholes used as water wells are described in more depth in that article.
OmegaWiki Dictionary
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borehole A narrow straight hole bored in the ground for extracting resources.
