4 255 fig4 copyrightc 2005 by ali ghalambor boyun guo

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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 carrying capability. For design size kick (0.5 ppg): EMW13600=17.9+16000/13600*(0.5)=18.49 ppg Gain Margin =0.2 ppg = 18.69 ppg ΣEMW13600 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 Gain Margin = 0.2 ppg = 18.67 ppg ΣEMW13600 Fracture Gradient At 1360...
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