This preview shows page 1. Sign up to view the full content.
Unformatted text preview: ent total design. Fig.11a Collapse Design Fig.11b Burst Design Tension Design
The tentative current design for burst and
collapse provides knowledge of weights,
grades and section lengths for the designed
sections. These can be schematically
represented so that the forces acting on this
casing string while it is being run are
shown(Fig.12). There are two types of forces
acting on the casing; buoyant forces and
gravitational forces(Fig.12 and 13).
156 Copyright(c) 2005 by Ali Ghalambor & Boyun Guo 78 Fig.12 157 The buoyant forces are the product of the pressures
times the exposed end area. The gravitational forces
are simply the weights of the section. If these forces
are quantified and summed form the bottom up, a
running tension line representing the tension in the
casing at each increment of total length, while being
run, can be drawn(Fig.13).
Maximum tension design must include consideration
of the casing becoming stuck while being run , and
the crew pulling on it to free it. A multiplication type
View Full Document
This document was uploaded on 03/28/2014.
- Fall '14