Changes

  | isbn    = 0891816607

  | isbn    = 0891816607

}}

}}

Drilling problems include any difficulties encountered while drilling a well. The most common drilling problems are the creation of doglegs and key seats, hole instability, lost circulation, and excessive bottom hole temperatures.

Drilling problems include any difficulties encountered while [[drilling a well]]. The most common drilling problems are the creation of doglegs and key seats, hole instability, lost circulation, and excessive bottom hole temperatures.

==Doglegs==

==Doglegs==

==Bottom hole temperatures==

==Bottom hole temperatures==

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:

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

[[Category:Engineering]]

[[Category:Engineering]]

[[Category:Engineering – Development and Operations]]

[[Category:Engineering – Development and Operations]]