Each operator may have his own set of design factors

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

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...
View Full Document

This note was uploaded on 12/03/2012 for the course PMRE PMRE6004 taught by Professor M.tamim during the Summer '12 term at Bangladesh University of Eng and Tech.

Ask a homework question - tutors are online