Cause Analysis and Protection Measures of Wellbore Corrosion in Dongsheng Gas Field
In view of the serious corrosion of the outer wall of the tubing in the Dongsheng gas field,the corrosion mechanism is defined as oxygen depolarization corrosion,and oxygen comes from membrane nitrogen gas lifting by comprehensive chemical analysis and gas well production dynamic analysis.The high speed of liquid accumulation in frequent gas lift Wells leads to the formation of high temperature and high pressure enclosed space containing oxygen and water in the annulus,resulting in serious corrosion of the outer wall of the tubing.The law of oxygen depolarization corrosion is defined based on the high temperature and high pressure test,and the corrosion protection measures are put forward from the aspects of improving corrosion environment,chemical protection,pipe upgrading and optimization.
dongsheng gas fieldoxygen depolarization corrosionnitrogen gas lift by membrane
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