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Unformatted text preview: an the source of
the kick pressure less the gas hydrostatic at the
surface casing shoe, the formation will fail, acting
like a “pop value”, and the maximum burst loading
on the surface casing will be as show in Fig.2b.
143 Fig.2a Fig.2b Copyright(c) 2005 by Ali Ghalambor & Boyun Guo 144 72 The load line is defined by the two end points.
Injection Pressure at the casing shoe.
Surface Press.= Inj.P – SD(Dg) (Eq.2)
Continuous depositional basin conditions are to be
assumed for illustration. In this geological
environment, the lowest pressure possible behind
the surface casing is the hydrostatic pressure of a
full column of native fluid. In this case 0.465 psi/ft
salt water(see Fig.3).
In maximum load casing design, the backup
pressures are always subtracted form the load
pressure to determine the net load, called the
resultant(Fig.4). Fig.3 Fig.4 Copyright(c) 2005 by Ali Ghalambor & Boyun Guo 146 73 The remaining requirement is to build in extra
strength for wear considerati...
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- Fall '14