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Scale Cause Analysis and Control Practice for Water Injection Wells

Product Number: 51321-16773-SG
Author: Xiang Zhou; Zhengrong Ye; Weidong Jiang; Xiaodong Cui; Donghong Guo; Guohao Chen; Huachang Chi; Feifei Huo; Zhiwen Yang; Yingfeng Chen; Lei Zhang
Publication Date: 2021
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The waterflood development was adopted in a carbonate oilfield in the Middle East to enhance oil recovery. The injection water has high salinity and high Ca2+ concentration, which lead to scale deposition in the wellbore of water injection wells, even plugging the tubing and seriously impairing the normal water injection production. To explore the causes for scale deposition in water injection wells, X-ray diffraction (XRD) technology was used to analyze the composition of the scale formation on the tubing of water injection wells. The injection water scale tendency was simulated to find out the main scale components and the influencing factors with a scale prediction software. The scale deposited on the surface of the tubing was mainly FeS, CaCO3, FeOOH, and NaCl. Brine ratio, temperature, and ions concentration (Ca2+, Fe2+, etc.) have a significant effect on the scale tendency. High salinity, high Ca2+ concentration, the presence of Fe2+, and highly corrosive produced water are the main causes for the scale deposition in water injection well. The scale and corrosion issues were well controlled by the method of adding scale inhibitor, corrosion inhibitor, and oxygen remover and adopting ultra-high molecular weight polyethylene (UHMWPE) lined tubing.

The waterflood development was adopted in a carbonate oilfield in the Middle East to enhance oil recovery. The injection water has high salinity and high Ca2+ concentration, which lead to scale deposition in the wellbore of water injection wells, even plugging the tubing and seriously impairing the normal water injection production. To explore the causes for scale deposition in water injection wells, X-ray diffraction (XRD) technology was used to analyze the composition of the scale formation on the tubing of water injection wells. The injection water scale tendency was simulated to find out the main scale components and the influencing factors with a scale prediction software. The scale deposited on the surface of the tubing was mainly FeS, CaCO3, FeOOH, and NaCl. Brine ratio, temperature, and ions concentration (Ca2+, Fe2+, etc.) have a significant effect on the scale tendency. High salinity, high Ca2+ concentration, the presence of Fe2+, and highly corrosive produced water are the main causes for the scale deposition in water injection well. The scale and corrosion issues were well controlled by the method of adding scale inhibitor, corrosion inhibitor, and oxygen remover and adopting ultra-high molecular weight polyethylene (UHMWPE) lined tubing.

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