Page 20 - Well Control for Completions and Interventions

14 Well Control for Completions and Interventions

Figure 1.6 “Normal” pressure distribution from the surface through a reservoir
structure.

Figure 1.7 Artesian well—abnormally pressured.

Fig. 1.8 shows an anticline structure. The permeable sandstone in the
structure is filled with gas with a pressure gradient of 0.1 psi/ft. The sur-
rounding formation is filled with salt water with a pressure gradient of
0.465 psi/ft, normal for the North Sea.
Reservoir pressure at 5000 ft is 2325 psi. The gas bearing formation is
2000 ft thick from crest to base, so the pressure at the top of the