To carry out design calculations, the designer has to decide which load cases to use. This decision is based on the likelihood of occurrence and the risks involved if the load case does occur.

This section presents the load cases to be considered, for : burst/collapse, installation and service loads.

Burst loads

1. Burst during drilling

Burst loads can occur during the drilling phase due to displacement of the borehole to hydrocarbons. There are, however, a number of special cases to be considered. The base…

Installation loads

After the casing string has been designed to withstand the anticipated collapse and burst loads, it should be checked against the loads that will be experienced during the installation, and against…

Collapse loads

1 Evacuation during drilling

Collapse loads occurring during drilling are usually the result of borehole evacuation due to natural or induced losses. There are however other cases to be considered.


Casing Design Loads

Introduction to Casing Design Loads (Collapse, Burst and tension Load)

1  Collapse Load

The design load case for collapse is based on a partial evacuation of the casing string.

For partial…

Pressure (Collapse and Burst) loads on casing

This article describes the methods to quantify the different casing loads are presented. Internal and external pressure profiles are generally independent and therefore separate design loads will be…

Service loads

The initial casing design, is not an exact reflection of the service loads, as it assumes that the casing string is not fixed at either end. It must be ensured that the incremental stresses resulting…