Bentonite
A colloidal clay, expansible when moist, commonly used to provide a tight seal around a well casing.
Source: Terms of the Environment ...
Bentonite: highly plastic clay consisting of the minerals montmorillonite and beidellite that swells when wet and is often used as a lining material to seal landfills and lagoons.
bentonite A colloidal clay, largely made up of the mineral sodium montmorillonite, a hydrated aluminum silicate. Because of its expansive property, bentonite is commonly used to provide a tight seal around a well casing.
Bentonite
Clay made of decomposed volcanic ash which is used to seal wells (hole plug).
Beryllium (Be) ...
Bentonite: A hydrous aluminium silicate clay mineral which is used to provide a seal between well casing and the borehole. Also, it is sometimes added to drilling fluid to increase its viscosity.
Seal: The impermeable material, such as cement grout bentonite, or puddling clay placed in the annular space between the borehole wall and the casing of a water well to prevent the downhole movement of surface water or the vertical mixing of ...
Fluid used to lubricate the bit and convey drill cuttings to the surface with rotary drilling equipment. Usually composed of bentonite slurry or muddy water. Can become contaminated, leading to cross contamination, and may require special disposal.
Drilling Fluid- Fluid used to lubricate the bit and convey drill cuttings to the surface with rotary drilling equipment. Usually composed of bentonite slurry or muddy water.
 See also: Well, Hazard, Water, Organic, Concentration
  
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