聚异丙烯膦酸在长庆油田解堵过程中的技术研究

Study on IPPA Acid in Broken Down Process of Changqing Oil Field

针对长庆油田低渗、矿物中绿泥石含量高、酸化效果差的特点,选用了缓速性能好的IPPA酸。在此基础上加入盐酸等添加剂,优选出了IPPA酸液体系,并对其性能进行了评价。实验结果表明,IPPA酸液体系具有溶蚀能力强、界面张力低、无二次沉淀、对施工管道腐蚀速率低等特点;用IPPA酸液处理后,岩心的渗透率提高率平均达98.12%,岩心渗透率恢复率平均达128.94%,适合于该油田地层的酸化解堵。现场实施缓速深部酸化8口井,成功率为90%,平均单井日增油量为2.53 t。

In this paper,IPPA acid,with good retarded performance,was chosen in view of the low permeability high content of chlorite and the bad acid effect of Changqing oil field.Laboratory experiments show that the optimized acid system,formed with IPPA and hydrochloric acid,has the characteristics of good corrosion performance,low boundary tension,no secondary precipitate and no harm to operation pipes.After acidizing,the permeability of cores increases to 98.12% and the permeability recovery rate boosts to 128.94%.The success rate of application reached to 90% within 8 wells and the average single well production increased by 2.53 t.