Mechanical Analysis and Field Application of Coiled Tubing Hydraulic Jet Fracturing String

To address the stability issue of coiled tubing operation,the stress and elongation of two kinds of hydraulic jet annulus sand delivery fracturing string have been analyzed in the whole process of operation in Daqing oilfield.The main research include:(1)Stress and deformation analysis of the coiled tubing hydraulic jet fracturing string in the whole operation,and the corresponding mathematical model;(2)Analysis on the two common packer K344 and Y211 during fracturing;processing methods of the boundary conditions at the bottom of the fracturing string during the setting of different packers;(3)Calculation of the deformation and stress of the coiled tubing fracturing string during fracturing operation of Well Gulongnan P,and comparison with the field measured data.Analysis results showed that the mechanical model results have a small deviation with the measured data.The research results could provide theoretical guidance for coiled tubing hydraulic jet fracturing operation design and construction.