Anti-corrosion-based oilfield wastewater modification

Geng Fangzhi, Meng Jiang, Gao Qiuying, Xu Junnan, Xiang Zhipeng, Zhang Qin

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Natural Gas Technology and Economy ›› 2019, Vol. 13 ›› Issue (4) : 46-50. DOI: 10.3969/j.issn.2095-1132.2019.04.008

Anti-corrosion-based oilfield wastewater modification

  • Geng Fangzhi1, Meng Jiang1, Gao Qiuying2, Xu Junnan1, Xiang Zhipeng1, Zhang Qin1
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Abstract

Corrosion of wastewater system in the No.1 Central Processing Plant of Tahe Oilfield was studied in order to make non only its situations clear but also some reasonable measures against corrosion. Simulation experiments were carried out to analyze the reasons for this corrosion, and accordingly some measures were put forward. Results show that (1) the corrosion of wastewater system in this plant is primarily pitting corrosion and secondarily uniform corrosion; and (2) the water quality modifying chemical system of "pH modifier+coagulant+coagulant aid+water quality stabilizer" can reduce corrosion effectively. After simulation experiments, it's concluded that at the pH value of 6.5, corrosion rate is the lowest; the optimal synergy of chemicals occurs in the case of "pH value 6.5+coagulant 150mg/L+coagulant aid 8mg/L+water quality stabilizer 50mg/L"; and the rate of uniform corrosion declines from 0.0695mm/a to 0.0217mm/a with corrosion inhibition rate of 68.8%, and the rate of pitting corrosion decreases from 0.5458mm/a to 0.0806mm/a with corrosion inhibition rate of 85.2%. Obviously, this corrosion of wastewater system may be alleviated effectively.

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Wastewater treatment / Water quality modification / Chemical system / Injection concentration / Anti-corrosion

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Geng Fangzhi , Meng Jiang , Gao Qiuying , Xu Junnan , Xiang Zhipeng , Zhang Qin. Anti-corrosion-based oilfield wastewater modification. Natural Gas Technology and Economy. 2019, 13(4): 46-50 https://doi.org/10.3969/j.issn.2095-1132.2019.04.008

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