可重复关闭套管滑套的研制

DEVELOPMENT OF CASING SLIDING SLEEVE

在油气资源的开发中,常使用滑套对储层进行分层改造,针对不同的储层,需要使用不同的分层改造滑套和工艺技术。套管滑套是一种新型的与固井结合的使用套管管柱进行增产改造和开采的分段滑套工具。文章从套管滑套的设计难点入手,详细阐述了自主开发的套管滑套的管内水泥浆隔离和清洁、下水泥塞准确控制、管外水泥浆隔离、滑套关闭自锁、球座易钻、球座钻除后滑套自锁解除和滑套关闭工具等结构设计技术及其施工作业程序。通过大量室内试验验证,该套管滑套结构先进,性能优良,开关可靠,分段段数多,后期可进一步进行修井和分段改造作业,具有广阔的应用前景。

Sliding sleeve is often used in reservoir stimulation. Different sliding sleeves and processes are demanded for different reservoirs. Casing sliding sleeve is a new type stage sleeve used with casing string to do the stimulation and production. Starting from the design issues to be considered,the design features regards inner slurry isolation and cleaning,accurate control of cement plug setting,external slurry isolation,sliding sleeve closure and self locking,drillable ball seat,removal of sleeve locking after ball seat drilled,and sleeve closing device,etc. are deliberately elaborated. The lab tests prove the sliding sleeve is advanced in structure,having excellent performance,a reliable on/off,more frac stages and allowing for later overhaul or stage stimulation. It has a wide application prospect.