首页|Deflection of eccentric tubes under axial loading in curved wellbores
Deflection of eccentric tubes under axial loading in curved wellbores
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NSTL
With the advancement of technology,various types of downhole tools have been developed.It is necessary to ensure that downhole tools can be tripped to the predetermined well depth dirough a drilling and completion string without any damage.However,mathematical models to predict the downhole tool deformation under axial loading are lacking.In this paper,an eccentric tube deflection model is established according to the geometric characteristics of downhole tools.First,six contact cases of an eccentric tube under axial loading in a curved wellbore are considered.The model solves the eccentric tube deflection in the different contact cases dirough the beam-column model and energy method.Second,using this model,the critical axial load in the contact cases is examined along with the deflection,bending moment,and contact force of the eccentric tube.The results show that the deflection,bending moment,and contact force of the eccentric tube are related to the contact case.The bending moment and contact force of the eccentric tube in wrap contact under axial compression are higher than those in other contact cases.In particular,when the eccentric tube is subjected to wrap contact under axial compression,the maximum bending moment and contact force increase sharply,and this aspect can help evaluate the accessibility of the downhole tool.Finally,this paper proposes a new method based on the eccentric tube deflection model to analyze the accessibility of a completion string in the context of eccentric downhole tools.The effectiveness of the proposed method is demonstrated dirough a field case.
NSTL
