摘要
套管钻井是将标准套管作为钻杆,它省略了下套管工序,减少了起下钻杆和井下事故发生的次数,从而节省了钻井时间。利用膨胀管技术,可在井下将钻井管柱径向膨胀,形成单一井径井眼。膨胀后的生产套管能达到更大的尺寸,从而增加了油井的产量。因为这两种技术的施工程序相似,所以将这两种技术结合来实现膨胀套管钻井在理论上是可能的。复合的思路是用膨胀套管作为钻杆,当钻达目的层深度后将其膨胀。针对这种新型的钻井技术,由于钻井过程中膨胀套管要承受较大的扭矩,而且套管膨胀后强度大幅降低,所以对钻井过程中膨胀套管的抗扭以及膨胀后的抗外挤进行了考虑,并提出了解决的办法。最后,针对膨胀套管钻井的特点提出了其合理的应用范围。
Drilling with casing uses standard casing as drilling string and it can save drilling time by eliminating running casing procedure and reducing drilling string tripping times and downhole problems.With expandable technology,expanded tubular can provide a larger diameter of production casing which can increase the well productivity.Because both technologies have similar operation procedures,so expandable casing drilling which combines these two technologies is possible in theory.The new concept was to use expandable casing as drilling string which was expanded when reaching target depth.However,there were some technological challenges such as the big torque that expandable casing suffered during drilling process and the low collapsing strength of the expandable casing when it was expanded.The solutions were proposed after analyzing both challenges in this paper.The ranges of application were put forward according to the characteristics of expandable casing.
出处
《钻采工艺》
CAS
北大核心
2012年第5期1-3,6,共3页
Drilling & Production Technology
基金
国家重点基础研究发展规划(“973”计划)项目“深井复杂地层安全优质快速钻井基础研究”(编号:2010CB226704)
国家科技重大专项大型油气田及煤层气开发“复杂油气田地质与提高采收率技术”项目“复杂结构井优化设计与控制关键技术”课题(编号:2011ZX05009-005)
关键词
膨胀套管
钻井
抗扭
抗外挤
expandable casing,drilling,torsion resistance,collapsing strength,application
