Page 534 - Standard Handbook Petroleum Natural Gas Engineering VOLUME2

Flow of Fluids 489

Start with the wellhead
or flowlng bottomhole
pressure and assume Ap

I I Flow region 11: Calculate
Cal cul ate
sradient for Calculate 3
slip
I - regi;s factor factor
11 & 111 I
and interpolate

Calculate friction factor,
friction gradient, static liquid holdup, frict.ion
gradient, acceleration factor, friction gradlent.
gradient, total gradient static gradient, total
I I

9
Calculate AL

Repeat procedure until
ZAL is equal
to length of flow string

Figure 6-58. Flow diagram for the Duns-Ros method [19].