Factors Affecting Colloid Fraction of Organophilic Clay Used in Oil Based Drilling Fluids
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摘要: 针对不同生产工艺、不同类型的有机土在不同基础油中的胶体率差异较大的问题，分别对两个不同厂家的有机土（1#和2#有机土）进行胶体率实验。考察了不同类型的基础油、不同的极性溶剂（激活剂）和浓度、不同的搅拌速率、不同的搅拌时间对有机土胶体率的影响。结果显示：1#有机土在0#柴油中的胶体率100%，而在5#白油中的胶体率为20%，加入不同的极性溶剂胶体率达到100%；2#有机土在0#柴油、3#白油、5#白油中的胶体率均不足10%，加入极性溶剂后胶体率有不同程度的提高。此外，搅拌速率从3000 r/min增加至13 000 r/min，有机土胶体率从18%增加至29%；搅拌时间由5 min延长至40 min，有机土胶体率从22%增加至40%。通过实验数据分析，揭示了激活剂对有机土胶体率的作用机理，并对有机土胶体率性能指标的评价提出了建议，应明确测试条件，比如搅拌时间、搅拌速率、测试温度等，这些因素对有机土胶体率有一定的影响。Abstract: Two organophilic clay samples (1# and 2#) were taken to study the factors affecting the colloid fraction of the clays. Factors studied include type of base oil, type and concentration of polar solvent (activator), shear rate and time of shearing. It was found that the colloid fraction (expressed as percentage) of organophilic clay 1# was 100% in 0# diesel oil, and 20% in 5# diesel oil. When different polar solvents were added to the 5# diesel oil, the colloid fraction can be increased to 100%. The colloid fractions of the organophilic clay 2# in the 0#, 3# and 5# diesels were all less than 10%. After adding polar solvent in the three diesel oils, the colloid fractions of the organophilic clay in the three diesel oils were increased at different levels. When the stirring speed of the agitator was increased from 3000 r/min to 13,000 r/min, the colloid fractions of the organophilic clays were increased from 18% to 29%. When the time of shearing was increased from 5 min to 40 min, the colloid fractions of the organophilic clays were increased from 22% to 40%. Analysis of the experimental data has revealed the mechanism on which how activator affects the colloid fraction of organophilic clays. It is suggested in this paper that the conditions under which the colloid fraction test is performed should be specified, for example, the time of shearing, stirring speed and temperature etc. These factors also affect the colloid fraction of the organophilic clay.
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Key words:
- Organophilic clay /
- Colloid fraction /
- Base oil /
- Activator /
- Stir
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表 1 不同有机土在不同基础油中的胶体率
有机土 基础油 胶体率/% 1#有机土 3#白油 10 5#白油 20 0#柴油 100 2#有机土 3#白油 5 5#白油 5 0#柴油 8 注：有机土胶体率测试条件为室温，搅拌速率为
11 000 r/min， 搅拌时间为10 min
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