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首页> 外文会议>Annual Conference and Exposition on Corrosion NACExpo >THE TEMPERATURE AND IONIC STRENGTH DEPENDENCE OF THE SOLUBILITY PRODUCT CONSTANTS OF ACIDIC CALCIUM AND FERROUS PHOSPHONATE PHASES IN OILFIELD BRINE
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THE TEMPERATURE AND IONIC STRENGTH DEPENDENCE OF THE SOLUBILITY PRODUCT CONSTANTS OF ACIDIC CALCIUM AND FERROUS PHOSPHONATE PHASES IN OILFIELD BRINE

机译：油田盐水中酸性钙和硫酸亚膦酸盐阶段溶解性产物常数的温度和离子强度依赖性

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摘要

In this paper, we are presenting the results of the first quantitative study to characterize the initial interaction between acidic scale inhibitor and rock material during squeeze treatment. The precipitation of ferrous and calcium phosphonates was performed in batch experiments, under acidic conditions for a range of temperatures and ionic strengths. The stoichiometries of the precipitates, were found to be Fel.25H3.sNTMP and Cal.25H3.sNTMP, where NTMP is nitrilotris-(methylenephosphonic acid). Using a speciation model developed by Rice University, concentrations of free calcium, iron and phosphonate were calculates, from which the solubility product constants were derives as a function of temperature and ionic strength. In addition, column experiments were performed to test the presence of these phases and the effects of iron ions on the retention of NTMP.
机译：在本文中，我们介绍了第一次定量研究的结果，以表征挤压处理期间酸性抑制剂和岩土材料之间的初始相互作用。在酸性条件下，在一系列温度和离子强度的酸性条件下进行铁膦酸盐和膦酸钙的沉淀。发现沉淀物的化学测定仪是FEL25H3.SNTMP和CAL.25H3.SNTMP，其中NTMP是硝基硝基（甲基膦酸）。使用水稻大学开发的品种模型，计算自由钙，铁和膦酸盐的浓度，从中得到溶解度产品常数作为温度和离子强度的函数。此外，进行柱实验以测试这些阶段的存在和铁离子对NTMP的保留的影响。

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