评价一价盐和二价盐对水基泥浆流变性能的影响

O. K. Dankwa, Prince Opoku Appau, E. Broni-Bediako
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引用次数: 10

摘要

钻井液选择对于防止钻井作业中遇到的重大问题(如井眼封隔、卡钻和漏失)起着关键作用。在钻井作业中,由于添加剂或外来物质进入泥浆系统,对泥浆系统进行了过度处理,导致泥浆污染,从而导致泥浆性能发生不必要的变化。这使得泥浆系统在发挥其主要作用时效率低下。本研究研究了一价盐和二价盐(即氯化钾、氯化钙和氯化镁)对最易受污染的水基泥浆体系流变性能的影响。配制了16个泥浆样品,其中15个样品在环境温度下被不同浓度(0.75 g, 1.50 g, 2.50 g, 3.50 g和5.0 g)的各种盐污染。结果表明,随着不同盐浓度的增加,泥浆样品的塑性粘度、表观粘度和屈服点等流变性能均有所降低。结果表明,随着盐浓度的增加,泥浆样品的流变性能降低。这表明,随着一价盐和二价盐的污染,钻井泥浆的性能会显著下降,因为盐会影响颗粒的分散、水化和絮凝行为。CaCl2和MgCl2盐的效果比KCl盐更明显。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Evaluating the Effects of Monovalent and Divalent Salts on the Rheological Properties of Water Based Mud
Drilling fluid selection plays a key role in preventing major problems encountered during drilling operations such as hole pack-off, stuck pipe and loss circulation. Mud contamination which results from the overtreatment of the mud system with additives or foreign material entering the mud system during drilling operations causes unwanted changes in the properties of the mud. This makes the mud system inefficient in performing its major roles. This research studies the effects of monovalent and divalent salts namely Potassium Chloride, Calcium Chloride, and Magnesium Chloride on the rheological properties of water-based mud system which is most vulnerable to contamination.Sixteen mud samples were formulated of which fifteen were contaminated each with different concentrations (0.75 g, 1.50 g, 2.50 g, 3.50 g, and 5.0 g) of the various salts at ambient temperature.The results showed that the rheological properties such as plastic viscosity, apparent viscosity and yield point of the mud samples decreased as the concentrations of various salts increase.It was concluded that increase in the concentration of the salts resulted in a decrease in the rheological properties of the mud samples. This indicates that with the monovalent and divalent salt contamination, there is a significant decline in the performance of drilling mud since the salts affect the dispersion, hydration and flocculation behaviour of the particles. The effect was more profound with CaCl2 and MgCl2 salts than the KCl salt.
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