高压气涌控制过程中的防喷器压力和流量条件

Ala E. Omrani, M. Franchek, Yingjie Tang
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引用次数: 1

摘要

在气涌事件中,通过防喷器(BOP)的垂直向上多相流会产生复杂的流体流动瞬态。使这些瞬态更加复杂的是防喷器关闭过程中的流体相互作用。由此产生的压力和流量瞬变是影响防喷器设计的关键参数,应用于评估防喷器是否能够关闭/控制井涌事件。本文建立了一种流体-机械两相流模型,用于预测气涌时防喷器全开和全关时的流体压力和流量条件。研究人员对20000psi的储层进行了研究,并对井深进行了研究,从井底到井筒,范围从10000英尺到20000英尺。研究结果表明,在气涌事件中,基于模型的防喷器额定压力设计与地层产能指数的相关性。此外,使用基于模型的方法来确定这些信息对于制定下一代压力控制设备标准和设备认证、最大限度地降低钻井人员和钻机资产的风险以及降低油井干预频率至关重要。文中还讨论了基于孔隙压力和/或防喷器额定工作压力的高压定义。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
BOP Pressure and Flowrate Conditions During High Pressure Gas Kick Control
Vertical upward multiphase flow through a blowout preventer (BOP) during a gas kick event produces complex fluid flow transients. Further complicating these transients is the fluid phase interactions during BOP closing event. The resultant pressure and flowrate transients are critical parameters that influence the BOP design and should be used to estimate if the BOP can close-on/control a kick event. In this paper, a hydro-mechanical two-phase flow model is developed to predict the fluid pressure and flowrate conditions for fully open and closing BOP during a gas kick. The case of a 20,000 psi reservoir is investigated along with a wel depth, from the rig floor to the borehole, ranging from 10,000 ft to 20,000 ft. The results illuminate the dependence of model-based BOP pressure rated design on the formation productivity index during a gas kick event. Furthermore, using a model-based approach for determining such information is essential in the development of next generation pressure control equipment standards and equipment certification, risk minimization to drilling crew and rig assets and reduction of well intervention frequency. High pressure definition based on pore pressure and/or BOP rated working pressure are discussed as well.
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