Ferrous Iron Impact on Phosphonate and Polymeric Scale Inhibitors at Temperature Ranging from 25 to 70°C | Forum

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venynx Oct 16

Ferrous iron (Fe 2ϩ) is one of the most common cations existing in oil and gas production water. Most Fe 2ϩ ions come from dissolution of siderite in reservoir and corrosion of steel pipes. Compared to Ca 2ϩ and Mg 2ϩ , Fe 2ϩ has a higher complex stability constant with some common inhibitor function groups like phosphonate and carboxyl due to its transition metal structure. Therefore, understanding the influence of Fe 2ϩ on inhibitors is important to enhance inhibition performance. Work still remain to be done to understand the effect of Fe 2ϩ on scale inhibition, including a systematic study of the Fe 2ϩ influence on phosphonate and polymeric scale inhibitors at different pH, values and molar ratios. Little research has been done at temperatures above room temperature, dtpmpa probably due to the difficulty of developing strictly anoxic test apparatus. In this study, a new anoxic laser apparatus is designed to test inhibitor performance. This newly designed apparatus features constant Argon gas headspace purging during an experiment to guarantee a strict maintenance of anoxic condition. This anoxic apparatus is based on laser detection method of nucleation induction time. It is easy to operate and enables experiments to be conducted at temperatures up to 200°F.

(PDF) Ferrous Iron Impact on Phosphonate and Polymeric Scale Inhibitors at Temperature Ranging from 25 to 70°C.

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