超窄PPFG窗口深水高压高压钻井:ENI公司的案例研究,连续循环技术与MPD钻井相结合,成功应用于高温高压超深水井的极端钻井环境条件

E. Squintani, A. Uslenghi, S. Ferrari, L. Affede
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引用次数: 2

摘要

超深水井的特征通常是孔隙和裂缝梯度之间的边界很窄。埃尼公司的连续循环技术将环空动压力的控制推向了极限。本文介绍了通过技术应用和严格的程序控制,在超窄PPFG窗口内钻一口高温高压深水井的经验。在案例研究中,通过应用ENI近平衡钻井技术(e-nbd™),计划在高温高压井的储层段达到足够的井涌容限和节流裕度,以确保严格控制主屏障,实现目标的操作和安全性能。该方案要求使用e-cd™(eni循环装置)系统,该系统首次安装在具有6 5/8″DPs的钻井船上。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Deepwater HPHT Drilling through Ultra Narrow PPFG Window: A Case Study by ENI Where the Combination of Continuous Circulation Technology Together with MPD Drilling has been Successfully Applied to Extreme Drilling Environment Condition in HPHT Ultra Deepwater Well
Ultra Deepwater wells are commonly characterized by a narrow margin between pore and fracture gradients. Eni pioneer of the Continuous circulation technique has pushed the control of annulus dynamic pressure to the limit. The experience presented in this paper cover the drilling of an HPHT Deepwater well, through an ultra narrow PPFG window by means of technology application and strict procedural control. In the case study presented the reservoir section of an HPHT well was planned to be reached with an adequate kick tolerance and choke margin by applying the ENI near balance drilling technique (e-nbd™) in order to ensure strict control on the primary barrier and achieving the aimed operational and safety performance. The plan required the use of e-cd™ (eni circulating devices) system installed for the first time on a drilling ship with the 6 5/8″ DPs.
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