JZ9-3油田注聚井安全解聚剂研制及评价

Development and Evaluation of Safety Depolymerizer for Polymer Injection Wells in JZ9-3 Oilfield

针对JZ9-3油田长期注聚造成堵塞问题,分析了W井堵塞物成分和特征。通过氧化剂和稳定剂的筛选及优化,研制成一种安全解聚剂,并进行了堵塞物溶蚀、一维填砂管模型驱替实验、腐蚀速率的性能评价。结果表明,过碳酰胺对高浓度聚合物溶液和凝胶的降黏率均能达到99%;加入稳定剂后,可以控制活性氧释放速率,在60℃下静置72 h仍能保持8%活性氧含量,大幅度地提高了解聚剂的安全性。解聚剂对堵塞物溶蚀率达到91.6%,解堵后渗透率恢复率达到305%,具有低腐蚀速率、不产生氧气的特点,确保现场施工的安全。在W井现场解堵施工应用中表明,该解聚剂对长期注聚产生的堵塞具有良好的解除效果。

In view of the plugging problem caused by long-term polymer injection of JZ9-3 oilfield,the composition and characteristics of the blockage in well W are analyzed.A safety depolymerizing agent was developed by the screening and optimization of oxidizer and stabilizer,and the performance evaluation of plugging corrosion,one-dimensional sand-filled pipe model displacement experiments and corrosion rate were carried out.The experimental results showed that percarbonamide can reduce the viscosity rate of high-concentration polymer solutions and gels by up to 99%.After adding a stabilizer,the release rate of active oxygen can be controlled,and it can still maintain 8%active oxygen content at 60℃after 72 h,which greatly improves the safety of depolymerizer.The blockage removal rate of the depolymerizer is 91.6%,and the permeability recovery rate is 305%.The depolymerizer has the characteristics of low corrosion rate and no oxygen generation,so as to ensure the safety of on-site operation.The application of the depolymerizer in W well shows that it can effectively remove the blockage caused by long-term polymer injection.