Research and application of wellbore temperature field model of deep and ultra-deep well injection process
If the temperature field in the wellbore changes significantly due to the injection of low-temperature fluids,the tubing may deform due to temperature changes,resulting in a large additional axial force,leading to the deformation of the tubing and the loss of the pack-er's seal.Therefore,considering the characteristics of the wellbore structure and the heat transfer mechanism of the strata in deep and ultra-deep wells,a model of the wellbore tem-perature field during the injection process in deep and ultra-deep wells is established based on the law of energy conservation and thermodynamics.The steady-state assumption is used to eliminate the time term and the analytical method is continuously used to obtain the ana-lytical solution of the model.Combined with the wellbore structure and construction parame-ters of a certain ultra-deep well,the effects of complex wellbore structure and formation temperature on the calculation results are analyzed,and the distribution law of wellbore tem-perature under different injection temperatures and discharges is obtained.The research re-sults show that the model accuracy is higher after considering the complex wellbore struc-ture,with an absolute error of-0.56%compared to the bottom hole temperature,and an ab-solute error of 1.52%if the complex wellbore structure is not considered.The influence of formation temperature on wellbore temperature is small.The research results can provide da-ta support for tubular mechanics analysis and provide a theoretical basis for the optimization of operation parameters.
injection processcomplex wellbore structurewellbore temperature
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