For tension design assume no buoyancy effect 4 for

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Unformatted text preview: ssible Conditions, cont’d 3. For Tension design, assume no buoyancy effect 4. For Collapse design, assume no buoyancy effect The casing string must be designed to stand up to the expected conditions in burst, collapse and tension. Above conditions are quite conservative. They are also simplified for easier understanding of the basic concepts. 9 Casing Design - Solution Burst Requirements (based on the expected pore PB = pore pressure * Design Factor = 6,000 psi *1.1 PB = 6,600 psi Depth pressure) Pressure The whole casing string must be capable of withstanding this internal pressure without failing in burst. 10 Casing Design - Solution Collapse Requirements For collapse design, we start at the bottom of the string and work our way up. Our design criteria will be based on hydrostatic pressure resulting from the 12.5 ppg mud that will be in the hole when the casing string is run, prior to cementing. 11 Depth Casing Design Collapse Requirements, cont’d Pressure Pc = 0.052 * mud weight * depth...
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