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• the formation fluid deliverability (the ability of reservoir to produce or take-in the fluid) which is called Inflow Performance Relation (IPR)

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• wellbore fluid deliverability (the ability of well to lift up or lift down the fluid) and which is called Vertical Flow Lift Performance (VFPVLP) or Tubing Performance Relation (TPR)

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It is based on correlation between surface flowrate 

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1. Check the current production rate against the production target from FDP
   
   
2. If the diffference is big enough to justify the cost of production optimization (see point 8 below) then proceed to the step 3 below
   
   
3. Assess formation pressure based on well tests
   
   
4. Simulate IPR /VFP  VLP based on the current WOR/GOR
   
   
5. Calculate the stabilized flow bottom-hole pressure
   
   
6. Gather the current bottom-hole pressure

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7. Check up the calculation aganst the actual 

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8. Recommend the production optimisation activities to adjust bottom-hole pressure 

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   :
   
   
   • adjusting the choke at surface
     
     
   • adjusting the pump settings from surface 
     
     
   • changing the pump depth
     
     
   • changing the tubing size
     
     
   • changing the pump
     
     

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