Nitrogen injection tertiary oil recovery has become an important development method for oil and gas field production. With the increase of gas injec-tion scale,the problem of gas channeling is serious,which makes it very important to control the safety risk during workover operation. Through the in-depth analysis of the overflow accident case in the workover process of a nitrogen injection well,the causes of o-verflow in the workover process were clarified and the corresponding preventive measures were put forward. Effective results were obtained after application,and the application results can provide reference for the risk prevention and control of similar operations.
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