Occasionally, operations require setting a production liner on bottom. This could be unintentional, e.g. when the liner hanger slips fail to operate, or intentionally, e.g. when the liner is purposely run without a hanger to guarantee sufficient bypass area. A consequence of setting the liner on bottom is that the buckling force will be compressive, and assessment of the buckling severity is required to avoid high buckling induced dogleg severity (DLS). After the liner is cemented, the induced DLS is made permanent. Thus, this change in well path trajectory could jeopardize the runnability and installation of completion equipment.

In this study, the buckling induced DLS is estimated using a finite element based stiff-string model. The model takes in consideration the additional compressive loads of setting the liner top packer. It also accounts for liner centralization. It was found that this model overcomes the limitation of the theoretical models implemented in widely used commercial casing design software as it captures the physics of the buckled casing in between centralizers with more accuracy.

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