Everything about Borehole totally explained
A
borehole is the generalised term for any narrow
shaft drilled in the ground, either vertically or horizontally. A borehole may be constructed for many different purposes including the extraction of water or fluid (such as
oil) or gases (such as
natural gas or
methane), as part of a
geotechnical investigation or
environmental site assessment, for mineral exploration, or as a pilot hole for installing piers or underground utilities. Boreholes used as
water wells are described in more depth in that article.
In the
engineering and
environmental consulting fields, the term is used to collectively describe all of the various types of holes drilled as part of a
geotechnical investigation or environmental site assessment (a so-called Phase II ESA). This includes holes advanced to collect soil samples, water samples or rock cores, to advance insitu sampling equipment, or to install
monitoring wells or
piezometers. Samples collected from boreholes are often tested in a laboratory to determine their physical properties, or to assess levels of various chemical constituents or contaminants.
Typically, a borehole used as a well is completed by installing a vertical pipe (casing) and well screen to keep the borehole from caving. This also helps prevent surface
contaminants from entering the borehole and protects any installed pump from drawing in sand and sediment. When completed in this manner the borehole is then more commonly called a
well: whether it's a
water well,
oil well or natural gas extraction well.
Installation
Boreholes may be drilled using a
drilling rig, or by a hand-operated
rig. The machinery and technique to advance a borehole varies considerably according to manufacturer, geological conditions, fluid to be extracted, and job specification.
Climate proxy
Borehole temperatures can be used as temperature
proxies. This is because heat transfer through ground is slow, so that by measuring temperature (and using the proper mathematical formulas) past temperatures can be inferred several hundred years prior (Huang et al. 2000).
Further Information
Get more info on 'Borehole'.
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