高温合成聚合物压裂液体系研究

根据高温低渗储层压裂改造对压裂液性能的要求,从聚合物分子结构分析入手,以聚丙烯酰胺、聚丙烯酸、2-丙烯酰胺基,2-甲基丙磺酸(AMPS)为单体,合成新型耐高温聚合物,并对其性能进行了评价。实验结果表明,剪切3 h后,压裂液黏度降低1.4 mPa.s,剪切稳定性良好,并且剪切恢复性较好。随着温度的增加,压裂液交联时间逐渐缩短。该压裂液耐温可达170℃。在60℃时,聚合物压裂液破胶困难,可以通过提高破胶剂加量以提高压裂液破胶效果。聚合物压裂液的残渣率为0.83%,对岩心的伤害率为16.7%,对支撑裂缝导流能力的伤害小于植物胶压裂液。适合高温低渗储层的压裂改造。

Study of High Temperature Synthetic Polymer Fracturing Fluid

According to the requirement of high-temperature low permeability reservoir hydraulic fracturing treatment to the propriety of fracturing fluid,a novel high temperature polymer was synthesized by polyacrylic acid,polyacrylamide,2-acrylamido-2-methylpropanesulfonic acid(AMPS).Performance evaluation experiment results showed that the viscosity of fracturing fluid decreased by 1.4 mPa · s after shearing 3 hrs,which possessed good shear stability and viscosity recovery propriety.The crosslinking time gradually decreased with increasing temperature.The temperature resistance of fracturing fluid reached to 170℃.The fracturing fluid was difficult to break at 60℃,which could be overcome through increasing the dosage of gel breaker.The residue of polymer fracturing fluid was of 0.83%,and the damage to core matrix was only 16.7%.The damage to propped fracture was far less than guar gum fracturing fluid which was fit for the stimulation of high-temperature low permeability reservoir.