Abstract:

Based on the molecular structure of corrosion inhibitor of brine,the product with a good performance is synthesized by selecting ethylenediamine,formaldehyde and sub-phosphate as the main raw materials for high-temperature,high-salt oil and gas exploitation project preservation needs.The reaction conditions and the impact on products are discussed and the optimization is tesed.A corrosion inhibitor used in brine completion fluid is synthesized.In this paper,a detailed description of indoor weightlessness method is given for researching the performance evaluation of corrosion inhibitor system.The results show that the corrosion inhibitor possesses a good salt-resistant and anti-temperature capability with stable performance and evident result by adding a small amount of it.The corrosion rate can be controlled in 0.070mm/a when PH value is 5～8,tempreature lower than 20℃,added amount 0.2g/L.So it has excellent ability to effectively prevent corrosion of saline media.

Key words: corrosion, brine, corrosion inhibitors, organic phosphate, synthesis