Methods of Increasing Injectivity ^[26]

The following methods have been utilized for increasing injectivities of wells:

• Backflow by pumping, swabbing, dry DST or nitrogen cushion

• High rate pressure water injection, especially for wells completed in aquifers (normally used for low permeability zone)

• Acidizing, especially in the presence of carbonate scales

• Chemical washing, using chemicals/surfactants

• Steam injection in zone with residual oil saturation, including some plugging caused by deposition of wax or solid hydrocarbons