1 97 fig1 pit level fluctuations copyrightc 2005 by

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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 vessel(Fig.1) 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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