钻井液用页岩防塌剂中磺化度测定方法的改进

磺化沥青中磺酸钠基含量为衡量其质量好坏的重要指标，其含量越高，性能越好。采用离子色谱与元素分析仪相结合，建立了1种快捷地测定磺化沥青中磺酸钠基含量的方法。此方法测定每个样品结果的相对标准偏差（RSD）均小于1%（n=5），表明该方法具有良好重复性。经实验表明，此方法简单快速可靠，可便捷地应用于磺化沥青中磺酸钠基含量的测定。 

Improve the Test Method of the Degree of Sulfonation of Drilling Fluid Shale Inhibitors

Sulfonated asphaltene, an additive widely found in water base and oil base drilling fluids,is generally used to effectively plug the micro fractures, prevent sloughing shales from collapsing, and inhibit shale from becoming hydrated. It also has good lubricity, emulsifying capacity, and abilities to reduce filter loss and to stabilize mud properties at elevated temperatures. The content of sodium sulfonate in sulfonated asphaltene is an important index ofevaluating the quality of the sulfonated asphaltene; the higher the content of the sodium sulfonate, the better the quality of the sulfonated asphaltene. In laboratory studies, the ion chromatography and element analyzer were used together to establish a fast way of measuring the content of sodium sulfonate in sulfonated asphaltene. Using this method, the relative standard deviation (RSD) of the measuring result of each sample was less than 1% (n=5), indicating that this method had good repeatability. Experimental results demonstrated that this method is fast, reliable and easy to use in measuring the sodium sulfonate content in a sulfonated asphaltene.