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Unformatted text preview: .2 ppg
Acceptable Fracture Gradient At Casing Point = 18.4 ppg
Entering graphical representation of formation pressure-fracture
gradient versus depth with a design fracture gradient of 18.4 ppg at
bottom and projecting up to intersection with fracture gradient
curve, yields a tentative casing point of 13,600 feet in a formation
pressure of 14.5 ppg(Fig.4).
255 Fig.4 Copyright(c) 2005 by Ali Ghalambor & Boyun Guo 256 128 Deepest Setting Point Established
This tentative depth is checked for load
For design size kick (0.5 ppg):
= 18.69 ppg
Fracture Gradient At 13600
= 18.4 ppg
This is no good. The calculation indicates the
tentative casing point needs to be deeper where a
fracture gradient of 18.7 ppg can be attained. Fig.4
shows a fracture gradient of 18.7 ppg at 14000 ft .
14000 ft becomes the tentative casing point. For design size kick (0.5 ppg):
EMW14000=17.9+16000/14000*(0.5) = 18.47 ppg
= 0.2 ppg
= 18.67 ppg
Fracture Gradient At 1360...
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- Fall '14