5 the design line is used to determine the weights

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Unformatted text preview: ons. A burst design factor(BDF) will be chosen based on the degree of wear to be designed for. This BDF is a multiplier for the resultant. By multiplying the resultant line by the BDF, the design line is generated(Fig.5). The design line is used to determine the weights, grades, and section lengths of the different sections of casing to be designed. Intersection of the design line by the burst strength of a section of casing determines the length of that section(Fig.6) Fig.5 Fig.6 Copyright(c) 2005 by Ali Ghalambor & Boyun Guo 148 74 Collapse Design In maximum load concept, cement is never considered to set up, and cement is never considered to “help” the casing design. In most cases surface casing is cemented with a light lead cement followed by a dense tail cement, so that the load line is made up of two gradients(Fig.7). 149 Fig.7 Copyright(c) 2005 by Ali Ghalambor & Boyun Guo 150 75 If circulation is lost while drilling below surface casing, even in a continuous depositional basin environment, it is possible for the fluid level...
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