Abstract
The composition of oilfield water is complex and diverse. The development and application of corrosion inhibitors can effectively inhibit the corrosion of pipelines and equipment by oilfield water. The ions in produced water of Jidong Oilfield were determined by instrumental analysis and chemical analysis. Triazine prepared from ethanolamine and formaldehyde as corrosion inhibitor was evaluated by weight loss method. The corrosion inhibition experiments were carried out in ancient water samples, and the effects of concentration and temperature on corrosion inhibition were investigated. Finally, corrosion inhibitors were applied to the corrosion inhibition of produced water with different compositions in Jidong Oilfield, the corrosion inhibition of steel sheet was evaluated under different salinity conditions, and the effects of various ion contents in typical water samples and salinity on corrosion inhibition were analyzed. The experimental results show that the corrosion inhibition effect of triazine is better, and the product can be used in various water samples in oilfield with the inhibition efficiency above 85%.
Highlights
In the process of oil and gas field oil production, the produced water is of poor quality and complex composition [1]
3.2 Evaluation of corrosion inhibition of triazine The corrosion inhibition performance of triazine in ancient water quality was evaluated by weight loss method
The inhibition efficiency increases to 84.7953%, which has an excellent corrosion inhibition effect on steel sheet
Summary
In the process of oil and gas field oil production, the produced water is of poor quality and complex composition [1]. It generally has high salt content, high COD value, large polymer content, and large oil content [2,3]. If the water quality conditions do not meet the injection requirements, scaling, blockage, and corrosion will occur [6,7], which will inevitably cause corrosion on the oil layer [8], water injection pipelines and equipment [9]. As a new corrosion inhibitor, triazine, a synthetic product of ethanolamine and formaldehyde, has excellent corrosion inhibition properties. With the stable spatial structure and inhibitory properties [17,18], triazines are suitable for oilfield produced water containing complex ions
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