用高温熔炼方法制备含稀土铈的特殊黄铜合金,并将该合金和C7701合金分别浸泡于模拟油气田产出水中对产出水进行处理,之后采用EDTA络合滴定方法和失重法分别测定产出水中Ca2+的浓度;然后将N80钢片分别浸泡于经两种合金处理前后的模拟油气田产出水中,72 h后计算N80钢片表面的结垢率,并分别观察和分析水垢的形貌和物相;结合金属阳离子及原电池作用对N80钢片表面水垢的影响,研究了特殊黄铜合金的防垢效果.结果表明:特殊黄铜合金在模拟油气田产生水中能够析出更多的Zn2+,阻碍CaCO3晶体形核;在经特殊黄铜合金处理过的模拟油气田产出水溶液中浸泡72 h后,N80钢片表面的结垢率下降了20%;特殊黄铜合金能够将更多的方解石型CaCO3转变为文石型CaCO3,故其比C7701合金具有更好的防垢效果.
A special brass alloy contained rare earth cerium was prepared by high temperature melting method, and the brass alloy and C7701 alloy were immersed in simulated oil gas field production water, and then Ca2+ concentration in the production water was measured by EDTA complex formation titration method and the weight loss method.N80 steel sheet was immersed into simulated oil gas field production water with the two alloys treatment for 72 h to calculate the scaling rate on the surface of N80 steel sheet.The microstructure of the scale was observed, and the phase of the scale was analyzed.Anti-scale effect of special brass alloy was studied by combining with the effect of metal cations and galvanic cell action on the scale.The results show that, in the simulated oil and gas field production water, a relatively large amount of Zn2+ was produced by the special brass alloy, which hindered the nucleation of CaCO3 crystals;after immersing in simulated oil gas field production water with special brass alloys for 72 h, the scaling rate on N80 steel sheet surface decreased by 20%.More calcite calcium carbonate can transform into aragonite calcium carbonate with the special brass alloy′s action, so the special brass alloy has a better anti-scale effect than C7701 alloy.
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