Geothermal Gradient 1
Geothermal Gradient 1 :
(n). Geology, Drilling Fluids. The rate of increase in temperature per unit depth in the Earth. Although the geothermal gradient varies from place to place, it averages 25 to 30°C/km [15°F/1000 ft]. Temperature gradients sometimes increase dramatically around volcanic areas. It is particularly important for drilling fluids engineers to know the geothermal gradient in an area when they are designing a deep well. The downhole temperature can be calculated by adding the surface temperature to the product of the depth and the geothermal gradient. Syn: Temperature Gradient, Thermal Gradient. See: High-Pressure, High-Temperature Filtration Test, Mud Engineer
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