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This paper presents the detail design conditions, design criteria and methods as well as design conclusions of the process, structure and corrosion of the production flowlines and high pressure water injection lines in BZ34-2 / 4 oil field in Bohai Bay. At present this design represents the design capability and level in the field of the submarine pipeline engineering of China. 相似文献
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INTRODUCTIONTheroleofalgalextracellularmetaboliteasabioactivesubstancetocontrolsuccessionofmi croalgalpopulationshadlongbeenrecognized (MastandPace,1 93 8;PrattandFong,1 940 ) .Somemicroalgae,likeChlorellavulgaris,Chlamydomonasreinhardtii,Skeletonemacostatum ,exc… 相似文献
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Steel bar in concrete structures under harsh environmental conditions, such as chlorine corrosion, seriously affects its service life. Bidirectional electromigration rehabilitation (BIEM) is a new method of repair technology for reinforced concrete structures in such chloride corrosion environments. By applying the BIEM, chloride ions can be removed from the concrete and the migrating corrosion inhibit can be moved to the steel surface. In conventional engineering, the concrete structure is often configured with a multi-layer steel mesh. However, the effect of the BIEM in such structures has not yet been investigated. In this paper, the relevant simulation test is carried out to study the migration law of chloride ions and the migrating corrosion inhibitor in a concrete specimen with complex steel mesh under different energizing modes. The results show that the efficiency of the BIEM increases 50% in both the monolayer steel mesh and the double-layer steel mesh. By using the single-sided BIEM, 87% of the chloride ions are removed from the steel surface. The different step modes can affect the chloride ion removal. The chloride ions within the range of the reinforcement protective cover are easier to be removed than those in the concrete between the two layers of steel mesh. However, the amount of migrating corrosion inhibitor is larger in the latter circumstances. 相似文献
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铝合金钻杆在钻井液中发生腐蚀会引发严重的孔内事故。为了延缓钻井液对铝合金钻杆的腐蚀作用,在pH值为10、温度为70 ℃的聚磺体系钻井液中,分别加入一定比例的有机缓蚀剂(十二烷基苯磺酸钠,C18H29NaO3S或SDBS)及稀土缓蚀剂〔硫酸镧,La2(SO4)3〕,通过力学性能测试,研究缓蚀剂对7075系铝合金钻杆材料腐蚀的影响。结果表明:上述2种缓蚀剂均可降低铝合金在碱性钻井液中的腐蚀,提高铝合金钻杆抗拉强度最高达6.73%;合金中Cu、Mg、Si等元素的第二相粒子是腐蚀的敏感区域,第二相粒子脱落后即形成腐蚀坑;在产生腐蚀裂纹时,腐蚀产物主要由Al、C、O等元素组成。 相似文献
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海洋天然气水合物钻井的硅酸盐钻井液研究 总被引:2,自引:0,他引:2
在海洋含天然气水合物地层中钻进时,遇到的问题有水合物在井底的分解和管线内的再生成,以及井壁稳定和井涌的问题。配制合适的钻井液是解决上述问题的关键。通过大量实验,得到一种加入无机盐和动力学抑制剂的稀硅酸盐钻井液,并通过实验对其性能进行评价。结果表明:配制的硅酸盐钻井液不仅能满足常规钻井液携带岩屑和清洁井眼的要求,还能有效抑制井壁岩层的水化,抑制水合物地层的分解,以及控制水合物在管线内的再生成;因此可以满足深水含水合物地层钻进的要求,确保水合物地层钻探安全高效地进行。 相似文献
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缓蚀剂浓度对饱和CO2盐溶液中咪唑啉缓蚀剂膜的影响 总被引:1,自引:0,他引:1
咪唑啉及其衍生物是油田行业常用的耐二氧化碳腐蚀的缓蚀剂,其缓蚀机制主要是化学吸附作用。本文采用失重法、弱极化法、交流阻抗法等手段研究了1种新型咪唑啉缓蚀剂对Q235钢在饱和CO2盐溶液中不同浓度随时间的缓蚀行为变化,探讨了吸附膜的形成与衰减规律。结果表明:85℃存在极值浓度40 mg.L-1,此时缓蚀剂达到最佳状态,24 h即可成膜,膜寿命较长,可以维持至少120 h。 相似文献