在低温、低矿化度条件下的地层环境中,可溶桥塞的整体性能无法满足国内部分油田项目的实际施工需求.鉴于此,从可溶桥塞的材料选型、结构设计及计算、施工工艺研究等方面入手,成功研发出一款适用于低温、低矿化度条件下的可溶桥塞,并开展了现场试验.研究结果表明:研发的可溶桥塞能够适用于低温、低矿化度条件下的地层环境,最高耐温 150℃,承压 70 MPa,在20~70℃、Cl-质量浓度1 000~3 000 mg/L条件下,能够实现整体溶解;在油田现场压裂中,能够节省后期钻塞过程,明显提升了现场生产效率;该可溶桥塞工具实现了全可溶,明显减少了现场施工作业成本,故选择适合的可溶桥塞工具,可达到施工效果最大化.研究结论可为实现油田高效、低成本压裂施工提供技术指导.
In low temperature and low salinity formation conditions,the overall performance of soluble bridge plug cannot meet the actual operation requirements of some oilfields in China.In view of material selection,struc-tural design and calculation,and operating process,a soluble bridge plug suitable for low temperature and low sa-linity conditions was developed,and tested on site.The results show that the soluble bridge plug can be applied in low temperature and low salinity formation conditions,with a maximum temperature/pressure of 150℃/70 MPa.It can be completely dissolved under the conditions of 20℃to 70℃and Cl-mass concentration of 1 000 to 3 000 mg/L.In field fracturing,the late plug drilling process can be omitted,which significantly improves the field pro-duction efficiency.The soluble bridge plug can be fully dissolved,which significantly reduces the field operation costs,so the selection of a suitable soluble bridge plug can achieve maximum operation effect.The research find-ings provide technical guidance for achieving efficient and low-cost fracturing operation in oilfields.