| 滨海含水层胶体絮凝导致地层损害的实验研究 |
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| 引用本文： | 唐晓梦,林奇云,林国庆,孙静,初慧,苏胜,张丽春.滨海含水层胶体絮凝导致地层损害的实验研究[J].山东国土资源,2020,36(8). |
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| 作者姓名： | 唐晓梦 林奇云 林国庆 孙静 初慧 苏胜 张丽春 |
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| 作者单位： | 中国海洋大学海洋环境与生态教育部重点实验室,山东青岛 266100;山东省海洋环境地质工程重点实验室,山东青岛 266100;烟台市规划设计研究院有限公司,山东烟台 264000 |
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| 摘 要： | 滨海含水层地层损害是指淡水驱替咸水过程中,释放后的黏土胶体发生絮凝沉降,导致地层孔隙被堵塞,引起含水介质的渗透性降低的现象。该文通过絮凝沉降实验和定流速砂柱实验,分析不同离子强度和阳离子价态(一价、二价)对胶体絮凝沉降的影响,结果表明:NaCl作为电解质时,絮凝发生的离子强度范围在0.032～0.034mol/L之间,絮凝时间从82min减少至39min;而电解质为CaCl_2,离子强度为0.006mol/L时,胶体的絮凝时间仅需6min;钙钠比越高,黏粒絮凝发生的越快。砂柱实验结果显示,含水介质渗透性会随着电解质溶液的离子强度增加和阳离子价态的升高快速降低。当电解质为NaCl,离子强度分别为0.054mol/L和0.017mol/L时,含水介质渗透性降低20%所需时间分别为15min和50min;当电解质为CaCl_2,离子强度为0.011mol/L时,含水介质渗透性降低20%仅需5min。因为高离子强度和高价阳离子可以加速胶体絮凝,多孔介质的孔吼更容易发生堵塞,研究成果对降低滨海含水层的地层损害有一定的实际应用价值。
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| 关 键 词： | 滨海含水层 渗透性 黏土胶粒 离子强度 阳离子价态 |
Experimental Study on Formation Damage Caused by Colloidal Flocculation of Coastal Aquifer |
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| TANG Xiaomeng,LIN Qiyun,LIN Guoqing,SUN Jing,CHU Hui,SU Sheng and ZHANG Lichun.Experimental Study on Formation Damage Caused by Colloidal Flocculation of Coastal Aquifer[J].Land and Resources in SHANDONG Province,2020,36(8). |
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| Authors: | TANG Xiaomeng LIN Qiyun LIN Guoqing SUN Jing CHU Hui SU Sheng and ZHANG Lichun |
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| Abstract: | Formation damage of coastal aquifer refers to the flocculation and deposition of clay colloid during the displacement of salt water and fresh water. It has caused the pores blocked, and decreased the permeability of the aqueous medium. By using the flocculation experiments and sandcolumns experiments, the effects of ionic strength and cation valence on colloidal flocculation and deposition under different water chemical conditions have been studied. It is showed that when NaCl is regarded as the electrolyte, flocculation time drops quickly, and reduce from 82min to 39min, and the range of ionic strength is 0.032~0.034mol/L; when CaCl2 is regarded as electrolyte, the ionic strength is 0.006mol/L, the flocculation time only takes 6 minutes; the higher the calcium to sodium ratio, the faster the flocculation occurs. Sand columns experiments showed that the permeability of the medium will decrease when the ionic strength and the valence of the cation increases. When the ionic strength of NaCl electrolyte is 0.054mol/L and 0.017mol/L, the time for the permeability reduction by 20% is 15min and 50min respectively. For the same condition, when the ionic strength of CaCl2 electrolyte is 0.011mol/L, it takes only 5 minutes. The reason is that high ionic strength and valence cations can accelerate colloidal flocculation which cause the pores blocked. The results have potential practical application for reducing the formation damage of coastal aquifer. |
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| Keywords: | Coastal aquifer permeability clay colloid ionic strength cation valence |
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