Changes

The most common types of scale are calcium carbonate and calcium sulfate (gypsum). Sodium chloride (salt), sulfur, and other minerals can also be precipitated under certain conditions. The formation of these scales or solids can be minimized or prevented through use of chemical inhibitors, provided the produced fluids are analyzed ahead of time. If not, it may be necessary to perform a workover to clean out the well.

The most common types of scale are calcium carbonate and calcium sulfate (gypsum). Sodium chloride (salt), sulfur, and other minerals can also be precipitated under certain conditions. The formation of these scales or solids can be minimized or prevented through use of chemical inhibitors, provided the produced fluids are analyzed ahead of time. If not, it may be necessary to perform a workover to clean out the well.

===Paraffin or asphaltenes===

===Paraffin or [[asphaltenes]]===

Some oils can precipitate appreciable amounts of paraffin or asphaltenes as the temperature and pressure are reduced in the near wellbore region. Most often these deposits form near the surface where the temperature is lowest. However, there have been many confirmed cases of paraffin buildup near the perforations. Removal of these deposits can be accomplished with heated oil or chemical solvents.

Some oils can precipitate appreciable amounts of paraffin or asphaltenes as the temperature and pressure are reduced in the near wellbore region. Most often these deposits form near the surface where the temperature is lowest. However, there have been many confirmed cases of paraffin buildup near the perforations. Removal of these deposits can be accomplished with heated oil or chemical solvents.