Analysis of Load Characteristics of Coiled Tubing in the Process of Entering the Tubing with Residual Deformation
Due to the characteristics of coiled tubing operation,there is significant friction between it and the borehole wall during the initial stage of entry into the well,which poses certain safety risks in the control of operating load and the interception of the wellhead in emergencies.In addition,the study also finds that the residual deformation of the coiled tubing not only affects the initial hanging load,but also has a significant impact on the operating stability of the coiled tubing in the wellbore.By reasonably designing the radius of the guide frame,not only can the friction resistance of coiled tubing into the well be reduced,but also the deformation accumulation caused by residual stress can be reduced.At the same time,the optimal design of the guide frame radius helps reduce the uncertainty of the operating load.The residual deformation and its entry load characteristics of the surface structure of coiled tubing are studied,and a theoretical analytical model is established.The research results show that there is a correlation between the residual deformation of the coiled tubing and the radius of the wellhead guide frame.The initial hanging load of the coiled tubing with residual deformation decreases with the increase of the bending radius of the guide frame during running in the coiled tubing.By controlling the radius of the ground guide frame of the coiled tubing,the friction resistance to the wellbore can be effectively reduced,thereby achieving effective improvement of operation safety.
coiled tubingresidual deformationoil wellstring mechanicsfriction into the well
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