The Inhibitor Evaluation for Water Injection Pipeline of YanChang Oilfield
Shiqi Xu, Shangjing Hao, Sa Li · 2018
The main corrosion reason of water injection pipeline in YanChang oilfield is carbonate ions (or carbon dioxide gas) combined action of salts.The aim of the paper is to study the corrosion reason of the water injection pipeline in YanChang oilfield in order to develop an effective corrosion inhibitor for the water injection system.The corrosion inhibitor CQ-HO2 is synthesized by imidazoline introduced ethoxy groups.The evaluation of inhibition mechanism and inhibitive efficiency experiments were tested by weight-loss and electrochemical methods.The results of experiments show that the corrosion inhibitor CQ-HO2 is the anode type inhibitor, which can prevent the injection water pipeline from corrosion evidently.When the optimal concentration is 0.05% (weight per cent) at the temperature of 55℃, the inhibitive efficiency is up to 88.1%, which can mitigate the injection water pipeline corrosion of YanChang oilfield effectively.