2 ppg mud weight cross the 128 ppg formation pressure

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Unformatted text preview: ght(c) 2005 by Ali Ghalambor & Boyun Guo 264 132 14700 Feet becomes the tentative deepest depth to which the liner can be set. EMW12550=17.9+14700/12550*(0.5) = 17.79 ppg Gain Margin = 0.2 ppg ΣEMW12550 = 17.99 ppg Fracture Gradient At 12550 = 18.0 ppg This is Okay. In running the liner across the open hole form 12550 feet to 14700 feet, the maximum ΔP will occur with 17.2 ppg mud weight cross the 12.8 ppg formation pressure at 12550 feet. The Magnitude of this ΔP is : ΔP12550=(17.2-12.8)(0.052)(12550)= 2871 psi Since the actual ΔP (2871 psi) is less that the allowable ΔP (3100 psi), this line is okay. 265 Fig.7 Copyright(c) 2005 by Ali Ghalambor & Boyun Guo 133 Surface Casing Point Try 4000 feet EMW4000=13.2+12550/4000*(0.5) = 14.47 ppg Gain Margin = 0.2 ppg = 14.97 ppg ΣEMW4000 Fracture Gradient At 4000 = 14.4 ppg No Good! Try 4500 feet EMW4500=13.2+12550/4500*(0.5) = 14.59 ppg Gain Margin = 0.2 ppg = 14.79 ppg ΣEMW4000 Fracture Gradient At 4000 = 14.7 ppg No Good! Try 4700 feet EMW4700=13.2+12550/4700*(0.5) = 14.54 ppg Gain Margin = 0.2 ppg = 14.74 ppg ΣEMW4700 Fracture Gradient At 4000 = 14.8 ppg Okay The surface casing can be set at 4700 feet, and a fracture gradient of 14.8 ppg will be achieved. See Fig. 8 for the final casing setting depths. Fig.8 Copyright(c) 2005 by Ali Ghalambor & Boyun Guo 134...
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