Chlorite A micaceous mineral that is commonly green-colored, composed of iron and/or magnesium, and forms due to...

Convection Refers to heat transfer by fluid circulation in permeable rocks where thermal energy is transported with...

Cooling Tower Plant equipment that is used to dissipate heat into air rather than into a river. Cooling is induced in...

Cyclone Separator A large cylindrical vessel attached to two-phase production pipelines in geothermal fields that is...

DAS Distributed Acoustic Sensor. Involves the deployment of fiber optic cable on the surface or in a well, and the...

DFIT Diagnostic Fracture Injection Test. A subsurface well test in which pressure is monitored as a small volume of...

Diorite Dark colored, coarse grained, intrusive rock that contains less silica than granite and that is mostly made of...

Directional Drilling The practice of steering the trajectory of a well during drilling from vertical to a deviated...

Dolomite A carbonate mineral similar to calcite in which magnesium partially substitutes for calcium.

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...

Drill Core Intact cylindrical shaped sample of rock obtained during drilling with a special coring bit. Although...