Numerical Simulations Of Casing Collapse:
A Case Study In The South Of Iran
Author(s)
R. Gholami & V. Rasouli
Abstract
Collapse of casings during production has been reported on many occasions in
different fields. Regardless of the root for the failure of the casings, this is due to
stresses applied to the casing exceeding its ultimate strength. Failure of the
casing similar to any pipe could be due to compressional, tensional, and burst or
collapse forces due to various loads being applied to the casing string. Although
several analytical models have been developed based on elastic or plastic
approaches to estimate the ultimate strength of casing, it has been shown that
these methods underestimate the casing strength. Casings’ mechanical and
geometrical parameters, effective in-situ stresses, temperature, formation
properties and other intervening are simultaneously required for a complete
design of casing. To simulate the failure of casing in the presence of various
forces, numerical modeling is a robust approach that can be employed. In this
study, finite element simulation was used through the use of ABAQUS software
to model the failure of casings in one of the wells located in the southern part of
Iran. The results revealed that increasing the diameter to thickness (D/t) ratio
decreases the ultimate strength of casing, leading to unexpected failure in the
wells under consideration. It was also shown that eccentricity drastically reduces
the strength of casing. Since the numerical results of current study were in an
acceptable agreement with experimental studies, numerical simulation method
proposed here can be used to predict the casing collapse.
Keywords: numerical simulations, casing collapse, burst, collapse, axial force.
Keywords
numerical simulations, casing collapse, burst, collapse, axial force.
Related Book
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