胜利油田长效扩张式分层注水技术

针对任一级扩张式封隔器损坏或底球漏失导致检修更换扩张式分层注水管柱的问题，根据液压传动原理，研制了液缸扩张式封隔器，使封隔器内、外压力系统相对独立，以避免封隔器失效引起的检修更换分层注水管柱作业；根据现场实际情况，研制了组合式沉砂洗井阀和防漏装置，在保证正向密封的同时，降低底球漏失对分层注水管柱性能的影响。液缸扩张式封隔器与组合式沉砂洗井阀、防漏装置配合设计了受力平衡的扩张式分层注水管柱，形成了长效扩张式分注技术。该技术在胜利油田现场应用100余井次，均持续有效。现场应用结果表明，该技术可以有效解决单级及以上扩张式封隔器损坏、底球漏失引起的扩张式分层注水管柱整体失效的问题，提高注水开发效果。 

Long-Term Expandable Zonal Water Injection Technology in the Shengli Oilfield

To solve the problem of frequent replacement of expandable zonal water injection string due to expansion packer damage or bottom ball valve leakage, a cylinder-type expansion packer with relatively independent internal and external pressure systems was developed in accordance with the principle of hydraulic transmission. According to field practices, a combined sand flushing valve and leak-proof device was developed to ensure positive sealing and to reduce the influence of bottom ball valve leakage on the performance of a zonal water injection string. An expandable zonal water injection string with balanced force was designed based on a cylinder type expansion packer. It combined with sand flushing valve and leak-proof device to form a long-term expandable zonal water injection technology. This technology was applied in more than 100 wells in the Shengli Oilfield, and proved to be continuously effective. The field application results show that this technology can effectively solve the problem of integral failure of expandable zonal water injection strings caused by expansion packer damage and bottom ball valve leakage, thus improving the development efficacy of water injection.