The labyrinth segments should be introduced in the normal way using keyword
WELSEGS, then defined as labyrinth segments with keyword WSEGLABY. Labyrinth
segments should be given a very small length in keyword WELSEGS (of the order, say,
of the wellbore radius); this length is not used in any pressure loss calculations, but it
will influence the location of the connections in COMPSEGS or COMPSEGL. The
labyrinth segments should be given the same depth as their ‘parent’ tubing segments,
so that there will be no hydrostatic head across them. The pressure loss sum
across a labyrinth segment is reported as the friction pressure
loss; the acceleration pressure loss is set to zero.