深水导管设计及喷射安置工艺技术研究

Conductor Design and Jetting in Place in Deepwater Well

海洋深水区域日益成为海洋油气勘探开发的热点,但海洋深水地层因其特殊的沉积环境,致使深水钻井面临不稳定的海床、地层破裂压力低及海底低温等诸多的挑战,喷射导管技术是解决深水浅层所面临挑战的技术之一。该技术采用在导管内下入喷射动力钻具的方式,依靠导管串自身重力边钻进边下入导管,喷射到位后利用地层的黏附力和摩擦力稳固住导管,起出送入工具和管内钻具,完成导管的安装,避免因水泥浆密度过大而压破地层,也可避免由于深水低温等因素影响固井质量。通过对导管的受力分析,提出了导管的下深及导管串组成结构,同时也研究了导管在喷射安置过程中如何优选喷射钻进参数及采取的技术措施,确保导管喷射安置到预定位置,为海洋深水井导管设计与喷射安置导管提供了很好的参考与借鉴。

Deep water area is becoming increasingly the focus of offshore oil ＆ gas exploration and development. Because of the special sedimentary environment, the deep water drilling faces many challenges, such as unstable seabed, low formation fracture pressure, low temperature at seabed and so on, Jetting technology can solve the challenge faced in deep water top hole. Jetting tech- nology can avoid fracturing the formation because of the high mud density and avoid impacting the cementing quality due to the low formation temperature. This paper presents how to design the depth and string structure through conductor force analysis, and how to optimize jetting parameters and technical measures taken to ensure conductor jetted in place. It provides a good reference for deep water drilling.