阴阳离子双子表面活性剂在清洁压裂液中的应用

Application of anionic-cationic Gemini surfactants in clean fracturing fluid

刘明书¹ 唐善法² 方飞飞¹ 梁策² 黄嵘¹

长江大学石油工程学院，湖北 荆州 434023 长江大学油气钻采工程湖北省重点实验室，湖北 荆州 434023

School of Petroleum Engineering, Yangtze University, Jingzhou 434023, China Key Laboratory of Oil and Gas Drilling and Production Engineering of Hubei Province, Yangtze University, Jingzhou 434023, China

采用阳离子双子表面活性剂GC-18与阴离子双子表面活性剂GA-12复配，并引入有机阴离子，得到新型清洁压裂液VES-GCA。通过测定不同质量浓度的GA-12与有机阴离子添加剂X对压裂液体系黏度的影响，得到压裂液最优配方为0.10 g/L GC-18 + 0.10 g/L GA-12 + 0.03 g/L X。研究表明，该压裂液体系在70 ℃，170 s^-1条件下，表观黏度在30 mPa·s以上，能够满足清洁压裂液的携砂要求；抗剪切能力良好，破胶能力强，破胶后无残渣，对地层伤害小，且具有添加量低的优点，在中低温、低渗储层的压裂改造中具有良好的应用前景。

New clean fracturing fluid VES-GCA is prepared by mixing the cationic Gemini surfactant GC-18 with anionic Gemini surfactant GA-12 and introducing the balancing organic anions into the mixed system. By measuring the influence of different dosage of GA-12 and organic anion additive X on the viscosity of fracturing fluid, the optimized formulation is obtained, which is 0.10 g/L GC-18 + 0.10 g/L GA-12 + 0.03 g/L X. The study shows that the apparent viscosity of fracturing fluid system at the shear rate of 170 s^-1 and 70 ℃ stabilizes at over 30 mPa·s, which meets the viscosity demand of sand-carrying. This clean fracturing fluid has characteristics of good shear capacity, strong gel breaking ability, gel-free residue and less damage to the formation. For the property of low surfactant concentration, it has a broad application prospects in the fracturing operation of medium-low temperature and low permeability reservoir.

10.6056/dkyqt201205026