A 9-hour circulation test that followed stimulation proved fluid flow and energy transfer from an EGS reservoir in hot dry granite …
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.
Geothermal Glossary
Word of the Week – District Heating
District heating A scheme for distributing centrally produced thermal energy via a network of pipes to heat residential and commercial buildings. Such schemes are energy efficient and ideally suited for utilizing geothermal resources.
Word of the Week – Dolomite
Dolomite A carbonate mineral similar to calcite in which magnesium partially substitutes for calcium.
Word of the Week – Drill Bit
Drill Bit A tool that is placed on the end of a string of pipe to drill a well. Rotary drill bits are commonly used in oil and gas and geothermal drilling. Coring bits are used to obtain cylindrical core samples of rock that preserve mineralogical and textural...