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It has been found that designing the casing within

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Unformatted text preview: gth (psi) 198 Copyright(c) 2005 by Ali Ghalambor & Boyun Guo 99 Special Considerations Salt Sections 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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