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Each operator may have his own set of design factors

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Unformatted text preview: eliable casing strings. Each operator may have his own set of design factors, based on his experience, and the condition of the pipe. 5 Casing Design In PETE 411, we’ll use the design factors recommended by the API unless otherwise specified. These are the API design Factors: Tension and Joint Strength: NT = 1.8 Collapse (from external pressure): Nc= 1.125 Burst (from internal pressure): Ni = 1.1 6 Casing Design What this means is that, for example, if we need to design a string where the maximum tensile force is expected to be 100,000 lbf, we select pipe that can handle 100,000 * 1.8 = 180,000 lbf in tension. Note that the Halliburton Cementing Tables list actual pipe strengths, without safety factors built in. 7 Casing Design Unless otherwise specified in a particular problem, we shall also assume the following: Worst Possible Conditions 1. For Collapse design, assume that the casing is empty on the inside (p = 0 psig) 2. For Burst design, assume no “backup” fluid on the outside of the casing (p = 0 psig) 8 Casing Design Worst Po...
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