Abstract:Carbonate oilfield in Tahe oilfield for marine sedimentary formation, formation fluid with high salinity, high Cl-, high CO2, high H2S characteristics, and the injection gas well gas injection, soaking and production process, containing dissolved oxygen, make the corrosion environment even worse. Through mining based liquid water analysis, pipeline operation condition analysis and gas injection technology research for gas injection wells of carbonate rock reservoir, analysis, application of XRD diffraction intensity of scanning electron microscope, energy spectrum analysis and point corrosion image analysis VMS test analysis methods, study on the reaction of corrosion products and morphology of downhole and surface pipeline characteristics, through the pipeline in gas injection well tubing downhole, wellhead and Christmas tree and ground production pipeline hang into the three in material for monitoring coupon, to study the gas injection, soaking and production process in different monitoring sites of pipeline's corrosion rate, morphology and rule of law, to: from the bottom, wellhead to the ground pipeline, with the increase of corrosion pit monitoring period, deepen and strengthen, the corrosion rate increased; the process of gas injection, soak process to the process of corrosion degree gradually become larger, longitudinal corrosion capability is strong; gas injection and production process of 35CrMo, P110S and P110 three kinds of pipeline with corrosion resistance material change difference. And the analysis of mechanism model and a gas injection, soaking and production process control of injection well bottom, wellhead and ground pipeline corrosion characteristics and rules.