Chemical Enhanced Oil Recovery

Introduction : Chemical Oil Recovery

Method Primary Mechanism Secondary Mechanism Adv./Disadv.
Gas Flooding Miscibility; swelling of oil = decrease in viscosity Pressure maintenance  
Water Flooding Pressure maintenance Dec. mobility ratio  
Polymer Flooding Reduction in IFT Dec. mobility ratio  
Surfactant Flooding Reduction in IFT Dec. mobility ratio/cap. pressure  
Alkaline Flooding Reduction in IFT Dec. mobility ratio/cap. pressure  


Factors effecting incremental oil recovery

The incremental oil recovery obtained during any EOR method can be subcategorize into

  • Vertical sweep efficiency (Ez)

This is affected by Mobility ratio; Relative Permeability; Capillary Pressure.

  • Areal Sweep efficiency (Ea)

This is affected by Mobility ratio, Heterogeneity, Miscibility.

Questions

  1. What is the best way to quantify incremental oil recovery?
  2. Is there advantage of ASP over just polymer flooding?
  3. Is polymer flooding another name for viscosified water flooding?
  4. When will surfactant flooding preferred over polymer flooding?

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