The onset of buckling does not necessarily mean pipe failure. The acceptability of buckled casing must be assessed in two ways, i.e. the resulting stresses in the casing wall, and the access through the buckled casing for drilling and production tools. Stresses resulting from buckling must be added to those existing in the casing prior … Post-buckling analyses

The previous article presented the methods to quantify the installation and as-landed loads. The purpose of this article is to present methods to quantify the changes in stress in the cemented casing due to departure from the as-cemented conditions caused by changes in pressure and temperature. The temperature related service loads and the estimation of … Service loads

This articel describes the various installation loads and how they are calculated. self-weight (in air) loads pressure (buoyancy) loads bending loads dynamic drag loads shock loads point loads static drag loads temperature loads Note: According to the principle of superposition, these loads can be added algebraically. 1. Self-weight (in air) The self weight (in air) … Installation loads

The burst and collapse loads are calculated by taking the difference (Pi-Pe) between the internal and external pressure profiles for each load case. If the resulting load line is mainly positive, it is called a burst load line (BLL); if it is mainly negative it is called a collapse load line (CLL). The net pressures … Pressure loads (burst and collapse)

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 case and the special cases will be addressed in this section. 1.1 Internal pressure profile The worst-case internal pressure loading is that … Burst 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 from changes in pressure, temperature, and applied point loads once the casing is cement do not cause it to fail. … Service loads