Сomparative analysis between:
- the formation the reservoir fluid deliverability (the ability of 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 of well to lift up or lift down the fluid) and which is called Lift Curves (LC) (also called Vertical Lift Performance (VLP) or Tubing Performance Relation (TPR) )
It is based on correlation between surface flowrate
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- Setting up the required production or injection regime for each well upon the current formation pressure, reservoir saturation and production target specified by FDP
- Generating VFP tables as input for 3D simulations Lift Curves (LC) tables as input for Reservoir Flow Modelling (RFM)
Technology
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Most reservoir engineers exploit material balance thinking which is based on long-term well-by-well surface flowrate targets (whether producers or injectors).
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- Inflow Performance Relation (IPR) – responsible for reservoir deliverability (see below)
- Vertical Lift Performance (VLP), also called Tubing Performance Relation (TPRCurves (LC) – responsible for for well deliverability (see below )
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The intersection of IPR and VLP curves represent the stabilized flow Lift Curves represent the Stabilised wellbore flow (see Fig. 1)
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| Fig. 1. The stablised flow rate is represented as A sample case of stabilised wellbore flow represented by junction point of IPR and VLP curves Lift Curves. | Fig. 2. The dead well scenario. |
Given a tubing head pressure
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4.A sample case |
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| Fig. 45. A bunch of IPRs at different formation pressures and VLPs at Lift Curves at different THPs. |
Workflow
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- Check the current production rate against the production target from FDP
- If the diffference is big enough to justify the cost of production optimization (see point 8 below) then proceed to the step 3 below
- Assess formation pressure based on well tests
- Simulate IPR / VLP based LC based on the current WOR/GOR
- Calculate the stabilized flow bottom-hole pressure
- Gather the current bottom-hole pressure
LaTeX Math Inline body p_{wf} - Check up the calculation aganst the actual
LaTeX Math Inline body p_{wf} - Recommend the production optimisation activities to adjust bottom-hole pressure
:LaTeX Math Inline body p_{wf} - adjusting the choke at surface
- adjusting the pump settings from surface
- changing the pump depth
- changing the tubing size
- changing the pump
- adjusting the choke at surface
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[ Inflow Performance Relation (IPR) ] [ Lift Curves (LC) ]
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References
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