Abstract
To study the distribution law of circumferential residual stress after casing expansion, using the finite element explicit dynamic analysis method analyzed the expansion process of expandable casings under different expansion rates. The analysis obtained key technical parameters of circumferential residual stress, average circumferential residual stress and elastic recovery along the wall thickness direction after casing expansion. It is recognized that the maximum residual tensile stress after casing expansion locates in the middle part of the casing thickness direction. The maximum residual compressive stress locates in the outer wall of the casing. When the expansion rate exceeds 18%, the increase in expansion rate will not lead to an increase in circumferential residual stress after casing expansion. The elastic recovery after casing expansion will reduce the circumferential stress during the expansion process. Considering collapse strength and the influence of elastic recovery on casing patch sealing performance after casing expansion, 23% is the most suitable expansion rate, which can effectively reduce the circumferential residual stress and improve the casing collapse strength. The analysis in this paper can provide bases for the calculation of casing collapse strength after expansion.
Highlights
Expandable casing technology is a major new technology in petroleum engineering in recent years, which is widely used in drilling, completion, oil production, workover and other fields
In this paper, using the finite element software analyzed that the distribution of circumferential residual stress along the wall thickness direction under different expansion rates and the influence of elastic recovery on residual stress after casing expansion, which provides bases for calculating the collapse strength after casing expansion
The circumferential residual stress has the greatest influence on the collapse strength after casing expansion13
Summary
Expandable casing technology is a major new technology in petroleum engineering in recent years, which is widely used in drilling, completion, oil production, workover and other fields. Kiptisia W et al.[3,4,5] used theoretical analysis and finite element method to analyze the residual stress of tube transition zone and joint. Tang Hailiang used finite element software to analyze the influence of different yield strengths on the residual stress of the expansion tube. In this paper, using the finite element software analyzed that the distribution of circumferential residual stress along the wall thickness direction under different expansion rates and the influence of elastic recovery on residual stress after casing expansion, which provides bases for calculating the collapse strength after casing expansion. In this paper, using the finite element analysis software Workbench LS-DYNA module simulates the expansion process of the expandable casing. Grid layers along the thickness direction of the casing are set as eight layers, which is shown in figure 3
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