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Unformatted text preview: add and subtract pit changes and report a
true pit volume even though the pit level may
change due to heave of the floating
97 Fig.1 Pit level fluctuations Copyright(c) 2005 by Ali Ghalambor & Boyun Guo 98 49 Fracture Gradients
It is essential that the open hole formation
exhibit enough competency to allow the well
to be killed w/o losing circulation.This implies
that the fracture gradients must be greater
than the equivalent mud weights .
Fracture gradients are dependent in part on
the amount of overburden stress applied ant
the depth of interest.
99 Example: In Fig.2-A, at 10,000 ft on
land operations the overburden stress
would be 10,000 psi if 1 psi/ft is
assumed as the overburden stress
gradient.However, Fig.2-B illustrates
that the overburden stress at the same
10,000 ft depth of interest would be
8930 psi under the given assumptions.
100 Copyright(c) 2005 by Ali Ghalambor & Boyun Guo 50 Fig.2-A Fig.2-B
101 Fig.3 Effect of water depth on fracture gradients Copyright(c) 2005 by Ali Ghalambor & Boyun Guo 102 51 Surfa...
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- Fall '14