Abstract
Borehole breakout is well known from drilling operations. The borehole often assumes an elongated or elliptical shape mainly because the normal borehole stresses are anisotropic. This very same mechanism applies to sand production which is actually a wellbore collapse. In order to quantify the risk associated to wellbore collapse a reliable estimate of the collapse volume is necessary. In this study, we investigate the effects of in-situ stresses and rock properties combined with the optimal well geometry. The well is initially circular, but the collapsed state should be modelled with elliptical geometry. The study shown that borehole collapse is a shear-type failure that occurs at low wellbore pressure when the tangential stress become large, ultimately resulting in failure. The volume of produced sand is then computed from the equilibrium state of the borehole as the volumetric difference between the ellipse and a circular hole. The collapse volume decreases with the increase of borehole fluid density and is more sensitive to the change of fluid density when fluid density is near the equivalent density of pore pressure.
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The authors are grateful to the Petrovietnam University for financial support of the work.
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Van Hung, N., Linh, B.T.T. (2022). A Calculation Model for Borehole Collapse Volume in Deviated Openhole in Formation with Weak Plane. In: Huynh, D.V.K., Tang, A.M., Doan, D.H., Watson, P. (eds) Proceedings of the 2nd Vietnam Symposium on Advances in Offshore Engineering. VSOE2021 2021. Lecture Notes in Civil Engineering, vol 208. Springer, Singapore. https://doi.org/10.1007/978-981-16-7735-9_5
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DOI: https://doi.org/10.1007/978-981-16-7735-9_5
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