平湖BA6S井复杂情况原因分析与认识

Analysis and Understanding of Complex Situations in Pinghu BA6S Well

谢海涛 钱爱东

XIE Haitao QIAN Aidong

中海油能源发展股份有限公司上海工程技术分公司, 上海 200030

CNOOC EnerTech-Shanghai Drilling & Producing Branch, Shanghai 200030, China

平湖BA6S井为自BA6井φ339.7 mm套管开窗的一口侧钻井，该井主要目的是气藏挖潜及兼探放二断块P8以下低孔低渗储层，在钻井施工过程中发生了18次钻具刺漏和一次溢流，文章从井眼轨迹、侧钻方案、钻具疲劳、临界转速及低孔低渗储层溢流预测等方面对该井复杂情况行了分析，并提出建议，对今后类似井的钻井设计和现场作业提供参考。

Well BA6S is a sidetracked well from well BA6 with φ339.7 mm casing, and the main purpose is to tap the potential of gas reservoir and to explore the low porosity and low permeability formation beneath P8 in Fang Ⅱ fault block. There occured 18 drill strings washout and 1 gas kick while drilling this well. In this paper, the complex situations in this well are analyzed, including well trajectory, sidetrack plan, drill string fatigue, critical surface RPM and overflow prediction in low porosity and low permeability formation, and some suggestions have been made.This can provide valuable reference for future similar drilling plan and feld operations.

https://doi.org/10.3969/j.issn.1008-2336.2018.01.072