CAES Cavern Wellbore Tubular String Preferably

The technology of salt cave compressed air energy storage with low cost,environmental protection,no pollution and high energy storage efficiency.In recent years,the technology has received more and more attention at home and abroad.However,due to the high-frequency injection of humid air in the salt cavern storage reservoir,the injection pipe string is prone to fatigue damage and fracture failure under the action of corrosion and stress,resulting in gas well scraping and gas storage outage.Seriously restrict the normal operation of the gas storage and the service life of the string,which brings huge economic losses.Therefore,the optimization of the salt acupoint compressed air storage column is particularly important.Based on the environment and characteristics of the operation of the salt cavern compressed air energy storage system,this paper uses the combination of theoretical analysis,laboratory test and numerical simulation to carry out the following work:During the high frequency circulation injection and production process,establishing a model for predicting the temperature and pressure distribution of the wellbore.The temperature and pressure distribution of the wellbore under different working parameters were obtained by numerical simulation,and further simulated by Well Cat software.The results were similar to the numerical simulation results,which further verified the reliability of the model.The model provides a basis for calculating wellbore column temperature and pressure alternating load.In addition,designing an indoor corrosion coupon experiment and simulating the effects of temperature,pressure,and flow rate on pipe corrosion.The results show that whether under the influence of temperature,pressure or flow rate conditions.Corrosion rate is presented this law: J55>N80>L80-13Cr>super 13 Cr.Comprehensive economic applicability conditions,preferably L80-13 Cr pipe column material is more suitable for on-site operation of salt cavern gas storage.At the same time,combined with the on-site salt cavern gas storage project,the strength of the L80-13 Cr pipe was checked to meet the safety requirements of the site.Through the research in this paper,we have a clearer understanding of the optimization of the wellbore tubular string under different injection and production conditions.According to the actual site conditions,the preferred method of injection pipe string is proposed.The research results of the thesis can provide a reference for the preferred selection of the salt acupoint compressed air energy storage wellbore string.