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Well Casing
Large diameter pipe that is assembled and inserted into newly drilled intervals of a well. The upper portions of a cased well are commonly cemented in place to provide a smooth internal bore, and prevent the inflow of water and/or collapse of the hole.
Geothermal Glossary
Word of the Week – Hydraulic Gradient
Hydraulic Gradient The slope on the water table which promotes horizontal fluid flow in permeable rock units.
Word of the Week – Hydrothermal Eruption
Hydrothermal Eruption Rare explosive discharge of hot water and steam that is powerful enough to excavate a crater and lift rock fragments and its pulverized equivalents into the air to produce an apron deposit around the eruption vent.
Word of the Week – Illite
Illite A potassium-bearing mica-like clay mineral that is a product of hydrothermal alteration. It commonly replaces feldspars and other alumino-silicate minerals and it forms above ~220°C. It also reflects a weakly acidic pH condition in hydrothermal fluids.