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It is based on correlation between surface flowrate
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Application
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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 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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This is primary domain of Well Flow Performance (WFP) analysis.Well Flow Performance (
WFP) is performed on stabilised wellbore and reservoir flow and does not cover transient behaviour which is one of the primary subjects of Well Testing domain.
The conventional WFP – Well Performance Analysis is perfomed as the
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- Inflow Performance Relation (IPR) – responsible for reservoir deliverability (see below)
- Lift Curves (LC) – responsible for well deliverability (see below )
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The intersection of IPR and Lift Curves represent the Stabilised wellbore flow (see Fig. 1)
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Given a tubing head pressure
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Fig. 5. A bunch of IPRs at different formation pressures and 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 / LC based on the current WOR/GOR
- Calculate the stabilized flow bottom-hole pressure
- Gather the current bottom-hole pressure
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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
The above workflow is very simplistic and assumes single-layer formation with no cross-flow complications.
In practise, the Well Flow Performance (WFP) analysis is often very tentative and production technologists spend some time experimenting with well regimes on well-by-well basis.
See Also
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Petroleum Industry / Upstream / Production / Subsurface Production / Well & Reservoir Management
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[ Inflow Performance Relation (IPR) ] [ Lift Curves (LC) ]
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References
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Joe Dunn Clegg, Petroleum Engineering Handbook, Vol. IV – Production Operations Engineering, SPE, 2007
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