Volume 6, Issue 6, November 2018, Page: 190-195
The Research of Bohai Sea-Based Annulus Protection Fluid
Ren Yi, CNOOC Energy Technology & Services LTD., Tianjin, China
Lu Yuan, CNOOC Energy Technology & Services LTD., Tianjin, China
Zhang Mao, CNOOC Energy Technology & Services LTD., Tianjin, China
Cheng Yan, CNOOC Energy Technology & Services LTD., Tianjin, China
Sun Jixing, CNOOC Energy Technology & Services LTD., Tianjin, China
Wang Zhongguang, CNOOC Energy Technology & Services LTD., Tianjin, China
Received: Nov. 8, 2018;       Accepted: Dec. 4, 2018;       Published: Dec. 26, 2018
DOI: 10.11648/j.ogce.20180606.20      View  98      Downloads  21
Abstract
The advantages and disadvantages of oil-based and freshwater-based annulus protection fluids were compared. According to the characteristics of freshwater shortage on offshore platforms, the quality of Bohai sea water was analyzed in detail. The sterilization effect of various fungicides was evaluated by extinction dilution method in the laboratory, and the quaternary ammonium salt YHZWJ-15 was determined as one of the basic components. After that, the method of industry evaluation standard was used to conclude that polyphosphate BH-701 has excellent scale prevention performance. For the most important corrosion inhibitor in the system, BHH-509, which is composed of gluconate, organic amine, zinc salt and organic phosphonic acid copolymer, is successfully compounded by static corrosion rate method. Finally, the polarization curve was used to analyze the action mechanism of the annulus protection fluid, and the basic ratio was seawater + 0.5% YHZWJ-15 + 0.01% BHF-701A + 0.01% thiourea + 0.5% BHH-509. It can reduce the corrosion rate to 0.0051 mm/a and the corrosion inhibition rate can reach more than 95%.
Keywords
Annulus Protection Fluid, Anti-salt Corrosion Inhibitor, Bactericide, Scale Inhibitor, Bohai Oilfield
To cite this article
Ren Yi, Lu Yuan, Zhang Mao, Cheng Yan, Sun Jixing, Wang Zhongguang, The Research of Bohai Sea-Based Annulus Protection Fluid, International Journal of Oil, Gas and Coal Engineering. Vol. 6, No. 6, 2018, pp. 190-195. doi: 10.11648/j.ogce.20180606.20
Copyright
Copyright © 2018 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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