Libra盐下PRM永久油藏监测的可重复性如何?全波弹性和声学研究

C. Déplanté, R. Sansonowski, D. Garcia, Bernardo Radefeld Mereilles, Mônica Maria Muzzette da Costa, R. Dias
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引用次数: 0

摘要

Mero (Libra NW)是一个高气产率(GOR)和高二氧化碳含量的油田,因此采出的气体被回注到储层中,储层管理策略围绕在地面气体回注能力的限制下减少气体以最大限度地提高石油产量。储层很厚,但渗透率变化幅度为4个数量级(图1左),包括高孔隙度/高渗透率单元,我们预计这些单元将引导部分天然气注入,但通常无法通过三维地震进行绘制。为了解决这一问题,Libra Join Project Team (JPT)提出了一种生产策略,结合了几种技术,如HiSep CO2分离技术:一种注入策略,结合了水交替气(WAG)来减缓气体的流动,并将气体注入到含水层最多孔的部分,以延缓生产商周围GOR的增加。智能完井技术的使用,可以在不同的层位进行关闭,以限制不同层位的注气量或产气量。一种将示踪剂与高质量4D相结合的监测策略,以检测和跟踪气体前缘。首先,将两种优先策略结合起来,可以提高反应性油藏管理的效率,解决当地较高的水平(Kh)或垂直(Kv)渗透率所带来的风险(图1右)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
How Repeatable will Libra Pre-Salt PRM Permanent Reservoir Monitoring be ? A Full Wave Elastic and Acoustic Study
Mero (Libra NW) is a field with high Gas Oil Rate (GOR) and high CO2 content, therefore the produced gas is reinjected in the reservoirs and the reservoir management strategy revolved around mitigating gas to maximize oil production within the limitations of surface gas reinjection capability. The reservoirs are thick but present 4 orders of magnitude in the variations of permeability (Fig. 1 left), including presence of high porosity/high permeability units that we anticipate will channel part of the gas injection, but are generally impossible to map from 3D seismic. The production strategy put in place by Libra Join Project Team (JPT) to address this setting combines several technologies that combine together with others such as HiSep CO2 separation: An injection strategy combining Water Alternating Gas (WAG) to slow the gas, with injection of gas into the most porous parts of aquifers in order to delay the increase of GOR around the producers. The use of intelligent well completions with several levels that can be de-activated in order to limit the amount of gas injected or produced in various zones. A monitoring strategy combining the usage of tracers with high-quality 4D in order to detect and track the gas fronts. Firstly, combining the two first strategies should provide efficiency in reactive reservoir management, adressing the risks induced by locally strong values of respectively high horizontal (Kh) or vertical (Kv) permeability (Fig. 1 right).
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