A Simulation Study on Buckling Friction Resistance of Casing Uplift and Flushing in Three-dimensional Complex Well

doi:10.11885/j.issn.1674-5086.2019.07.05.01

Abstract

Abstract: In the casing lowering process, it is difficult or even unable to reach the expected well depth due to complex wellbore structures, complex wellbore trajectories and well diameter changes. Intending to solve this problem, a simulation study on buckling friction resistance of casing uplift and flushing in three-dimensional complex well is carried out. Based on the theory of additional friction in helical buckling sleeves, a three-dimensional finite element model of the“ up-and-push” operation of a complex wellbore casing was established based on the actual operating parameters of Well H by ABAQUS. The model was used to analyze the casing stress and buckling deformation of the whole well section. The results of analysis show that the axial force of the casing in the vertical well section of Well H at the moment of flushing and releasing and after free stabilization is greater than its helical buckling critical load, there was severe helical buckling deformation in the section between the well depth of 2 000 m and the deflection point, the lower casing is unable to transmit power and has difficulty in lowering. It reveals the mechanism of this kind of three-dimensional complex wellbore casing down-diffusion, which is of great significance for the research on buckling morphological damage and failure of complex wellbore casing strings.

Key words: running casing, helical buckling, contact force, friction, finite element method

CLC Number:

TE931.2

LIN Tiejun, LI Zhaoyang, WANG Xuegang, DENG Yuanzhou, SONG Lin. A Simulation Study on Buckling Friction Resistance of Casing Uplift and Flushing in Three-dimensional Complex Well[J]. 西南石油大学学报(自然科学版), 2020, 42(4): 165-172.

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