Control of Corrosion and Scaling in Reinjection Water Well and Field Conduct in Jingbian Oil Production Plant

To solve the problem of corrosion and scaling in rejection water well in Jingbian oil production plant of Yanchang oil field, the rejection water block was investigated, the rejection medium characters and regular pattern were analyzed, the key factors of corrosion and scaling were confirmed. Combined with the practical situation in rejection wells, protection plan was made. By adding pH regulator, deoxidant, bactericide, corrosion and scaling inhibitor to the reinjection water, the water corrosion and scaling degree was weakened. In the same time, protective agent adding technics was optimized. By moving the agent adding points previously, the scope of protection was expanded and number of injection wells was increased. The protection plan implementation and monitoring results showed that the corrosion rate and scaling degree were all decreased more than 70%, which meets the requirements of the industry standard fully.