Oil production is decrease when flow restrictions occur in wellbore induced by chemical and/or mechanical changes.
The major contribution of these issues can be outlined as follows.
  • Flow assurance problems such as paraffin or asphaltenes
  • Formation damage e.g. Solids plugging,Clay-particle swelling or dispersion,Saturation changes,  Wettability reversal
  • Mechanical failures due to sand production, collapse, scaling and corrosion

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