Research On The Structure Optimization And Stability Of Fracturing Packer Rubber Tube

The fracturing packer rubber tube is an important sealing component for the oil and gas well exploration and development of the packer.Its sealing performance has a direct impact on the stratification effect of the packer during the operation.The sealing performance of the rubber tube is related to various structural parameters,rubber materials,working conditions and the like.However,most studies only perform a single factor analysis on the parameters affecting the sealing performance of the rubber tube,ignoring the influence of the interaction between the factors of the rubber tube.Therefore,according to the sealing principle of the sealing rubber tube and the failure mode,the finite element model conforming to the working conditions is established,and the sealing performance of the rubber tube is comprehensively analyzed by the effective experimental design method.Through the establishment of the deformation stage model of the rubber tube,a detailed supplementary analysis of the deformation process of the existing rubber cylinder is carried out.In this paper,a certain type of fracturing packer rubber tube is taken as the research object.Based on the sealing principle,a finite element analysis model is established,combining the nonlinearity of the material,the geometric nonlinearity and the nonlinear characteristics of the rubber cylinder contact mechanics.The parameters of the single-factor parameters affecting the sealing performance of the rubber tube are optimized and selected.Considering the influence of the interaction between the factors,the response surface design method responding to the maximum contact stress is introduced in this paper,and the sealing rubber tube is optimized to obtain the rubber tube seal.After obtaining the optimal combination scheme of the sealing factor of the rubber tube,the effectiveness of the optimization result is verified by experiments.The surrounding environment of the packer rubber working was complicated,and the three-dimensional torsion model was established to change the sealing performance of the rubber tube when it was twisted under the well.The results show that the torsion will reduce the overall sealing of the rubber tube,and the different torsional loads are unstable to the sealing of the rubber tube.Based on the deformation characteristics of the rubber tube,the finite element software modeling analysis and MATLAB fitting deformation curve are applied to different types.The deformation process of the material's rubber tube is studied.It is found that in the stage of free deformation and restraint,the rubber tubes of different structure types have stable and unstable deformation,and the effect of material difference has a significant effect on the load during the free deformation stage to make the rubber and the sleeve contact,and the load making the deformation of the rubber from unstable to stable during constrained deformation stages.Among the four materials,the minimum load during the free deformation stage to make the rubber and the sleeve contact,and the load making the deformation of the rubber from unstable to stable during constrained deformation stages of PU are the highest,followed by HNBR,NBR,and FKM.