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Unformatted text preview: gth (psi) 198 Copyright(c) 2005 by Ali Ghalambor & Boyun Guo 99 Special Considerations
Salt can have liquid characteristics. It can
flow. If this occurs, the salt can flow against a
casing string and exert bending, shearing, or
collapse loads on that string.
It has been found that designing the casing,
within the salt section, in collapse for
overburden stress gradient loads will
generally solve the problem(Fig.37).
199 Fig.37 Collapse Design (Salt Section) Copyright(c) 2005 by Ali Ghalambor & Boyun Guo 200 100 Fig.38 The overlapped liner configuration 201 Trapped Annulus: (Temperature Induced Pressure)
Annular fluid is “trapped” between two casing
strings. If that is heated, it will try to respond by
expanding, substantial pressure will build up. This
pressure acts as a collapse load on the inner string
of casing and burst load on the outer string.
Simpler solutions are required. One simpler solution
is to leave the outer casing seat open to the
formation. Do not cement up into the outer casing
string. This exposes the formations below...
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This document was uploaded on 03/28/2014.
- Fall '14