烯基琥珀酸酐改性瓜尔胶的合成及其凝胶破胶性能研究  

Synthesis and Property Study of Gel and Gel Breaking for Guar Gum Modified by Alkenyl Succinic Anhydride

作　　者：薛贝[1] 沈一丁[1] 杨晓武[1] 李培枝[1] 王健[2] 

机构地区：[1]教育部轻化工助剂化学与技术重点实验室(陕西科技大学),陕西西安710021 [2]延长石油集团炼化公司,陕西延安716000

出　　处：《油田化学》2012年第4期402-406,共5页Oilfield Chemistry

基　　金：国家发改委"鄂尔多斯盆地大型岩性地层油气藏勘探开发示范工程-多羟基醇压裂液"项目(项目编号2008ZX05044 1-2);未央区科委"多功能酸性清洁压裂液"项目(项目编号201008)

摘　　要：以碳酸氢钠为催化剂,采用干法制备烯基琥珀酸酐(ASA)改性瓜尔胶。瓜尔胶与ASA反应的最佳条件为:瓜尔胶原粉、ASA质量比7:1,反应温度60℃,反应时间10 h,碳酸氢钠质量分数0.4%。0.4%的ASA改性瓜尔胶水溶液的表面张力为35.29 mN/m。用过硫酸铵破胶后破胶液的表面张力为29.65 mN/m,煤油/冻胶破胶液的界面张力为2.27 mN/m,残渣含量为300 mg/L。与瓜尔胶原粉相比,改性瓜尔胶制备冻胶的耐温性、耐剪切性提高。在低剪切速率或温度较低时,改性瓜尔胶黏度降低,有利于减少流体在管道中流动的摩阻;而在高剪切速率或温度较高时,改性瓜尔胶黏度增加,有利于后期的携沙造缝。A novel guar gum modified by alkenyl succinic anhydride （ASA） was synthesized by dry preparation method when the catalyst was NaHCO3. The optimum reaction condition of the gum was obtained as follows： guar gum and ASA in mass ratio 7：1, 60℃ reaction temperature, 10 hrs reaction time and 0.4% NaHCO3dosage. The surface tension of 0.4% modified guar gum solution was of 35.29 raN/m, and that of the gelout solution, which was broken by ammonium persulfate, was of 29.65 mN/m. The interf^ial tension of gelout solution and kerosene was of 2.27 raN/m, and the residue content was of 300 mg/L. It was showed that the properties of temperature and shear resistance were improved after the guar gum modified. When the shearing rate or temperature was low, the viscosity of modified gum decreased, which was beneficial to reduce the flowing friction of fluid in pipeline. On the contrary, when the shearing rate or temperature was high, the viscosity increased, which was conducive to bring sand fracturing in later process.

关 键 词：瓜尔胶 烯基琥珀酸酐 制备 凝胶 破胶 

分 类 号：TE357.12[石油与天然气工程—油气田开发工程] O648.17[理学—物理化学]