multivariate production systems optimization - Stanford University
multivariate production systems optimization - Stanford University
multivariate production systems optimization - Stanford University
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μNS = μL λL + μG λG<br />
21<br />
(3.8)<br />
The superficial velocity of a phase is the velocity the phase would exhibit if it were the only<br />
phase in the system and had access to the entire cross-sectional area of the conduit. The<br />
superficial velocity for gas and liquid are<br />
VSG = QG<br />
A and VSL = QL<br />
A<br />
and the velocity of the mixture is the sum of the superficial velocities<br />
VM = VSG + VSL<br />
The superficial phase velocities differ from the true velocity of the phases which are<br />
VG = QG<br />
A HG and VL = QL<br />
A HL<br />
Slip velocity is defined as the difference between the true velocities of the phases.<br />
VS = VG - VL<br />
(3.9)<br />
(3.10)<br />
(3.11)<br />
(3.12)<br />
Most multiphase flow correlations only attempt to model binary <strong>systems</strong>. In the context of<br />
hydrocarbon <strong>production</strong>, the two phases are typically taken to be gas and liquid. If more<br />
than one liquid phase is being considered, such as oil and water, then a weighted average<br />
of the liquid parameters is used.<br />
where<br />
and<br />
ρL = ρO fO + ρW fW<br />
μL = μO fO + μW fW<br />
σL = σO fO + σW fW<br />
fO = QO<br />
QW + QO<br />
fW = QW<br />
QW + QO<br />
(3.13)<br />
(3.14)<br />
(3.15)<br />
(3.16)<br />
(3.17)