Structural Integrity Assurance Of Casing Pipes
In The Oil And Gas Industry
Author(s)
M. Rakin, M. Arsić, B. Medjo, Ž. Šarkoćević & A. Sedmak
Abstract
The exploitation of casing steel pipes used in oil and gas drilling rigs typically
involves a corrosive atmosphere, high pressures and elevated temperatures.
These conditions can affect the initiation and development of defects in the
material, which can jeopardize the safe service of the system. In this work, an
assessment of the integrity of a damaged pipe, manufactured by high frequency
contact welding (HF) of API J55 steel, is presented. The influence of an initial
defect (machined surface crack) on the pipe structural integrity is analysed.
Besides the defects at the internal surface, which is in contact with the
transported fluid, casing pipes are also exposed to damage at the external surface,
which is why such configuration is examined here. The analysed surface crack is
in an axial direction, bearing in mind that this type of defect is the most severe
for the cylindrical pressurised components.
Internal pressure testing is conducted on a pipe closed by dished ends. The
values of fracture parameters, crack mouth opening displacement CMOD and
J integral, were tracked during the experiment. The applied procedure
for J integral determination (so-called direct measurement) can be applied both
on standard specimens and on structures. It includes the use of combined
experimental – computational procedure. Finite element analysis is used for
determining the criteria for the pipe failure, regarding both crack growth
initiation and plastic collapse of the ligament. The size of the crack is varied in
the finite element models, in order to determine the influence of its size on the
maximum loading.
Keywords
casing pipe safe service, fracture resistance, direct J integral measurement, finite element method
Related Book
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