Abstract: Yingxi area was a key block for Qinghai Oilfield to increase reserves and production in recent years. However, the formation of this area has a high content of salt. In addition, salt is rapidly crystallized. Production from a lot of oil wells dropped quickly owing to plugging of production channels, causing great difficulties for exploration and development. To solve this bottleneck, the plug removing scheme was designed on the basis of various coiled tubing processes and under the principles of “tripping-in, tripping-out and small damage.” The scheme was mainly focused on rotary spraying jet tools for salt flushing + rotary spraying jet for reaming +hot water for dissolution of salt, with the help of using screw drill for drilling and abrasion as well as stabilizing the spraying jet. Meanwhile, a variety of salt flushing tools were designed and processed, such as rotary flow jet tool, rotary spraying jet tool and sharp point tool, whose process parameters were continually optimized in the service. A series of coiled tubing salt flushing and plug removing process technologies was developed and successfully used at nearly 50 times in the well service, providing effective support for normal production of high-pressure and high-yield oil wells.

摘要： 英西地区是近几年青海油田增储上产的重点区域，但由于地层含盐且出盐量大，盐结晶速度快，很多油 井投产后因生产通道堵塞致使产量急剧下降，给勘探开发工作带来很大阻力。针对这一难题，以“下得去、出得来、 伤害小”为原则，制定了以旋流喷射工具冲盐+ 旋转喷射工具扩眼+ 热水溶盐为主，螺杆钻具钻磨、扶正喷射等为辅 的多种连续管冲盐解堵方案，同时设计加工了旋流喷射工具、旋转喷射工具、尖状工具等多种冲盐工具，并在施工中 不断优化工艺参数，形成连续管冲盐解堵工艺系列技术，成功应用近50 井次，为高压高产油井的正常生产提供了有力 保障。

关键词: 连续管, 盐结晶, 冲盐解堵, 喷射洗井, 英西地区