水溶性AM-AA-NVP-AMPS-PDE暂堵剂的合成与性能

Synthesis and properties of water soluble AM-AA-NVP-AMPS-PDE temporary plugging agent

以丙烯酰胺、丙烯酸、N-乙烯基吡咯烷酮、2-丙烯酰胺基-2-甲基丙磺酸、1,5-戊二醇二丙烯酸酯为主要原料,制备了AM-AA-NVP-AMPS-PDE五元共聚物暂堵剂(本产品)。采用红外光谱以及元素分析对该暂堵剂结构进行了表征,研究了该暂堵剂的抗剪切性能、耐盐性能、悬浮性能、降解性能以及暂堵性能。实验结果表明,与常规暂堵剂AM-AA-MA相比,本产品具有更强的抗剪切强度、更高的膨胀倍数;在相同质量浓度氯化钠溶液中,本产品的抗剪切强度、膨胀倍数均高于AM-AA-MA。本产品吸水膨胀后,在压裂液中具有较好的悬浮稳定性能。本产品的降解时间受温度影响,在80℃下完全降解需要46.2h,所得溶液的黏度为1.9mPa.s;在120℃下完全降解需要1.8h,所得溶液的黏度为1.8mPa.s。本产品具有较强的封堵能力,抗压强度为15.8MPa,不需外加破胶剂即可在温度和水的作用下实现解堵,对应的渗透率恢复率为96.1%。

AM-AA-NVP-AMPS-PDE temporary plugging agent was prepared with acrylamide,acrylic acid,N-vinylpyrrolidone,2-acrylamido-2-methylpropane sulfonic acid and 1,5-pentanediol diacrylate as main raw materials.The structure of the temporary plugging agent was characterized by IR and elemental analysis,and its shear resistance,salt resistance,suspension performance,degradation performance and plugging performance were studied.The experimental results show that AM-AA-NVP-AMPS-PDE temporary plugging agent has stronger shear strength and higher expansion ratio than the conventional AM-AA-MA temporary plugging agent,and the shear strength and expansion ratio of AM-AA-NVP-AMPS-PDE are superior to the conventional AM-AA-MA temporary plugging agent in the same mass concentration of sodium chloride solution.AM-AA-NVP-AMPS-PDE has better suspension performance in fracturing fluid after water absorption and expansion.The degradation time of AM-AA-NVP-AMPS-PDE is affected by temperature.It takes 46.2 hours to fully degrade at 80℃,and the viscosity of the solution after degradation is 1.9 mPa.s;it takes 1.8 hours to fully degrade at 120℃,and the viscosity of the solution after degradation is 1.8 mPa.s.AM-AA-NVP-AMPS-PDE has a higher compressive capacity,with a compressive strength of 15.8MPa.Without breaker,the plugging can be removed under the effect of temperature and water,and the corresponding permeability recovery rate is 96.1%.