基于井与电潜泵综合建模的油井启动优化

K. Mukati, O. Wilson, M. Morales, Brian J. Arias, C. Terry
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引用次数: 2

摘要

采用多相流井和电潜泵集成模型,优化了一个大型深水生产系统在首次采油前的初始油井清理和投产作业流程。考虑到完井液在油管中的数量、近井流体密度的不确定性以及缺乏ESP操作经验,集成建模方法对于创建和测试启动场景至关重要。该模型用于模拟多种井启动场景:压裂充填液采收率的函数曲线、注入基量的函数曲线、自然流动井启动曲线、化学注入量和相关的地面注入压力、ESP启动过程中完井压力的激增、初始启动过程中需要的“a”环空溢流次数等将油管内多相流现象与油藏流入和泵的动态行为相结合。结果表明,该综合模型在确定油井启动过程中具有很高的可信度。这种完全动态的模型可以估计油管中任何位置的相位、压力、温度和流量,包括井节流作业的影响、基于速度的泵压力和温度动态、井下条件的影响和油藏流入。同时,还能准确地反映出ESP泵在作业过程中打开或关闭时油管和环空的瞬态行为。在本文中,我们将介绍如何开发集成模型,如何使用它来模拟各种场景,以及如何使用结果来创建和验证油井启动程序。本文提出的方法适用于任何使用ESP人工举升方法的井。该模型不仅可用于工程仿真,还可用于操作员培训和实时监控。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Optimization of Well Start-Up Using Integrated Well and Electrical Submersible Pump Modeling
An integrated multiphase flow well and electrical submersible pump model was used to optimize operating procedures for initial well clean-up and ramp up to production for a major deepwater production system before first oil. An integrated modeling approach was crucial to create and test start-up scenarios given uncertainty in the amount of completion fluid in tubing, uncertainty in density of near wellbore fluid and lack of prior experience in ESP operation. The model was used to simulate numerous well start-up scenarios:Well BS&W rate profiles as a function of frac pack fluid recovery percentageWell unloading profiles as a function of injected base volumeNatural flowing well start-up profilesChemical injection volumes and associated surface injection pressuresPressure surging across the completion during ESP start-upsNumber of "A" annulus bleeds required during initial start-up Accurately simulating such highly transient scenarios requires integrating multiphase flow phenomena in tubing to reservoir inflow and dynamic pump behavior. The integrated model proved to be very valuable in finalizing well start-up procedure with a high degree of confidence. This fully dynamic model can estimate phase, pressure, temperature and flow anywhere in the tubing including effect of well choke operations, pump pressure and temperature dynamics based on speed, effect of downhole conditions, and reservoir inflow. The transient behavior in tubing and annulus upon switching on or off ESP pump during well operation is also accurately represented. In this paper, we will present how the integrated model was developed, how it was used to simulate various scenarios and how the results were used to create and validate well start-up procedure. The methodology presented here is applicable to any well using ESP artificial lift methods. This model is a very useful tool not only for engineering simulation, but for operator training and real-time surveillance as well.
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