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Unformatted text preview: 3 ppg
Minimum mud weight
= 17.5 ppg
= 0.3 ppg
= 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
EMW12550=17.9+16000/12550*(0.5) = 18.1 ppg
= 0.2 ppg
= 18.3 ppg
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.
- Fall '14