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