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==Bottom hole temperatures==
==Bottom hole temperatures==
Extremely high bottom hole temperatures can occur in deep wellbores or in areas of abnormally high [http://www.glossary.oilfield.slb.com/en/Terms.aspx?LookIn=term%20name&filter=geothermal%20gradient geothermal gradient]. These excessively high bottom hole temperatures (greater than [[temperature::250°C]]) can cause drilling problems because of the accelerated thickening of [[Drilling_fluid#Water-based_muds|water-based drilling fluids]]. The increase in viscosity and density of the drilling can may result in the following:
Extremely high bottom hole temperatures can occur in deep wellbores or in areas of abnormally high [[geothermal gradient]]. These excessively high bottom hole temperatures (greater than [[temperature::250°C]]) can cause drilling problems because of the accelerated thickening of [[Drilling_fluid#Water-based_muds|water-based drilling fluids]]. The increase in viscosity and density of the drilling can may result in the following:
* Reduction in penetration rates
* Reduction in penetration rates