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102 Part I Liquid Drilling Systems

Figure 4.11 presents the calculated bottomhole equivalent mud
weight for a trip-out operation. The maximum pipe running speed with-
out fracturing the formation or causing a kick at a weak zone is analyzed
as follows. Figure 4.12 shows the maximum tripping speeds for different

Autofill Closed Circulation sub Pore
0

String Depth (ft) 10000
5000

15000
9.0 9.5 10.0 10.5 11.0
EMW (ppg)
Figure 4.11 Calculated bottomhole EMW for trip-out operation. Swab EMW @
15,000 (ft); spd = 50.0 (ft/min).

Figure 4.12 Calculated maximum allowable trip-in speed for a weak zone of
15,000 (ft).