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Unformatted text preview: 3 ppg Minimum mud weight = 17.5 ppg Swab consideration = 0.3 ppg Formation pressure = 17.2 ppg Copyright(c) 2005 by Ali Ghalambor & Boyun Guo 131 A formation pressure of 17.2 ppg exists at a depth of 14900 ft. So the tentative deepest depth to which a liner can be set is 14900 ft. For design size kick (0.5 ppg): EMW12550=17.9+16000/12550*(0.5) = 18.1 ppg Gain Margin = 0.2 ppg = 18.3 ppg ΣEMW12550 Fracture Gradient At 12550 = 18.0 ppg This is no good as the load(18.3 ppg) is greater than the strength (18.0 ppg). The deepest liner point must be shallower. The fracture gradient at intermediate casing point (12550 feet) will not change, it is 18.0 ppg. An EMW of 18.0 is required to satisfy the criteria, this is 0.3 ppg less that the EMW calculated at 14900 ft. It is concluded the the deepest liner point must be reduced to a depth requiring 0.3 ppg less mud weight than at 14900 feet. This means the liner point should be backed up the hole to a depth where a formation pressure of 16.9 ppg exists. Referring to Fig.6, this corresponds to a depth of 14700 feet. Fig.6 Copyri...
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This document was uploaded on 03/28/2014.

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