油田用瓜尔胶组成分析及改性研究
发布时间：2019-01-03 18:39
【摘要】：本论文以瓜尔胶原料,使用热重分析的方法对瓜尔胶的进行了稳定性分析和品质鉴定,并与常见的油田化学品进行了比较和区分;另外,分别利用3-氯-2-羟基丙磺酸钠和磷酸钠为改性剂对瓜尔胶进行了改性,以粘度和水不溶物为主要评价指标,通过正交实验探究得到了影响实验结果的最佳工艺条件,通过红外分析、热重分析及元素分析等手段进行了表征,探讨了改性反应的作用机理,再采用流变性实验、滤失实验、抑制性评价实验等对其作为压裂液稠化剂进行了作用效能评价。具体内容如下:(1)瓜尔胶的分解温度区间为230℃~350℃,黄原胶的分解温度区间为210℃~450℃,可溶性淀粉的分解温度区间为260℃~450℃,玉米淀粉的分解温度区间为270℃~450℃,聚丙烯酰胺受热易分解,聚乙烯醇的分解温度区间为200℃~550℃,羧甲基纤维素的分解温度区间为200℃~500℃;通过热重法鉴别出瓜尔胶里含有的聚丙烯酰胺的方法是可行的。(2)以3-氯-2-羟基丙磺酸钠为磺化剂对瓜尔胶进行改性,以表观粘度和水不溶物含量为评价指标,通过正交实验及单因素分析实验优选出较优改性条件为:反应温度26℃、反应时间2.0h、氢氧化钠占瓜尔胶质量分数为1.0%、3-氯-2-羟基丙磺酸钠占瓜尔胶质量分数为0.5%;优化项磺化产物的0.6%水溶液的表观粘度为104.3mPa·s,与瓜尔胶原粉(78.4mPa·s)相比提高了33%。红外分析中磺化产物在波数为1195cm-1、617cm-1附近出现的硫氧双键(S=O)和碳硫键(S-C)特征峰,证实成功引入磺酸基团;DSC分析中磺化产物吸热峰提前出现,熔融温度降低,S增加;元素分析中C元素的含量降低了1.580%,S元素的含量增加了0.142%,证实向瓜尔胶分子中成功引入了磺酸基;热重实验中磺化产物热分解峰滞后于原胶出现,说明改性产物耐热性增强;通过进行压裂液性能评价实验,结果表明磺化产物较原粉耐温性有所增强,抗滤失性能得到提升,对地层的抑制性有所增强。(3)以磷酸钠为磷酯化剂对瓜尔胶进行改性,以表观粘度和水不溶物含量为评价指标,通过正交实验及单因素分析实验优选出较优改性条件为:反应温度30℃、氢氧化钠加量为瓜尔胶质量分数的1.0%、磷酸钠加量为瓜尔胶质量分数的0.1%、反应时间为2.0h。优化项磷酯化产物的0.6%水溶液的表观粘度为103.7mPa·s与瓜尔胶原粉(78.4mPa·s)相比提高了32%;红外分析中磷酯化为产物在波数1085cm-1、856cm-1附近出现的磷氧双键(P=O)和碳氧磷键(P-O-C)的特征峰,证实了磷酸酯键的成功引入;DSC实验中磷酯化产物熔融温度降低了,S增加;热重实验中磷酯化产物热分解峰滞后于原胶出现,说明改性产物耐热性增强;通过进行压裂液性能评价实验,结果表明磷酯化产物较原粉耐温性有所增强,抗滤失性能得到提升,对地层的抑制性有所增强。
[Abstract]:In this paper, the stability and quality of guar gum were analyzed by thermogravimetric analysis and compared with common oil field chemicals. In addition, the guar gum was modified by sodium 3-chloro-2-hydroxypropylsulfonate and sodium phosphate respectively. The viscosity and water insoluble substance were used as the main evaluation indexes. The optimum technological conditions affecting the experimental results were obtained by orthogonal experiment. The results were characterized by infrared analysis, thermogravimetric analysis and elemental analysis. The mechanism of the modified reaction was discussed, and the rheological experiment and filtration experiment were adopted. Inhibition evaluation experiments were carried out to evaluate its effectiveness as a thickening agent for fracturing fluid. The main contents are as follows: (1) the decomposition temperature range of guar gum is 230 鈩，
本文编号：2399744
[Abstract]:In this paper, the stability and quality of guar gum were analyzed by thermogravimetric analysis and compared with common oil field chemicals. In addition, the guar gum was modified by sodium 3-chloro-2-hydroxypropylsulfonate and sodium phosphate respectively. The viscosity and water insoluble substance were used as the main evaluation indexes. The optimum technological conditions affecting the experimental results were obtained by orthogonal experiment. The results were characterized by infrared analysis, thermogravimetric analysis and elemental analysis. The mechanism of the modified reaction was discussed, and the rheological experiment and filtration experiment were adopted. Inhibition evaluation experiments were carried out to evaluate its effectiveness as a thickening agent for fracturing fluid. The main contents are as follows: (1) the decomposition temperature range of guar gum is 230 鈩，
本文编号：2399744
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