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Fig. 2. A sample case of stablised flow rate as function of formation pressure.Fig. 3. A sample case of stablised flow rate as function of formation water saturation and corresponding production water-cut.



Image Modified

Fig. 4. A bunch of IPRs at different formation pressures and TPRs at different THPs.


Workflow

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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/OPR based on the current WOR/GOR

  5. Calculate the stabilized flow bottom-hole pressure

  6. Gather the current bottom-hole pressure
    LaTeX Math Inline
    bodyp_{wf}


  7. Check up the calculation aganst the actual 
    LaTeX Math Inline
    bodyp_{wf}


  8. Recommend the production optimisation activities to adjust bottom-hole pressure 
    LaTeX Math Inline
    bodyp_{wf}
    :

    • 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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LaTeX Math Block
anchorJ
alignmentleft
J_s(q_o){sO} = \frac{q_oO}{p_R-p_{wf}}


for oil producer with liquid oil flowrate

LaTeX Math Inline
bodyq_{liq} = q_O + q_W
(water and oil at surface conditions)

LaTeX Math Block
anchorJ
alignmentleft
J_s(q_G) = \frac{q_G}{p_R-p_{wf}}


for gas producer with gas flowrate

LaTeX Math Inline
bodyq_G
at surface conditions

LaTeX Math Block
anchorJ
alignmentleft
J_s(q_g) = \frac{q_{GI}}{p_{wf}-p_R}


for gas injector with gas flowrate injection rate

LaTeX Math Inline
bodyq_{GI}
at surface conditions

LaTeX Math Block
anchorJ
alignmentleft
J_s(q_w) = \frac{q_{WI}}{p_R-p_{wf}}


for water injector with water flowrate injection rate

LaTeX Math Inline
bodyq_{WI}
at surface conditions

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where 

LaTeX Math Inline
bodyq_{max} = J_s \, p_R
  is the maximum reservoir deliverability when the bottom-hole is at atmosperic pressure and also called AOF – Absolute Open Flow.

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