Practical Approach to Address Pitfalls of High-Resolution Numerical Simulation Modeling in Advanced Completion Design Optimization Today

Zhen-Xuan Yew, Chee Seong Tan, Wee Wei Wa, G. Goh
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Abstract

Application of downhole flow control device (DFCV) has proven to be a successful strategy to mitigate early water or gas breakthrough in many fields in Asia. A conventional numerical modeling workflow is often applied in such studies. However, the full potential from the downhole installation is often not explored due to several numerical oversights in failure to adapt to the unique operation requirements and DCFV hardware design representation. This paper presents a practical approach to address pitfalls involved in high-resolution numerical simulation DFCV design optimization. In this paper, a multi-stage procedure is highlighted involving a numerical simulation model prepared for DFCV design and optimization. The first step is to investigate the grid resolution from the 3D model. This is to ensure the effect of grid-to-well resolutions from coarse scale to finer scales to capture the device behavior along the open hole (OH) length of horizontal wells and to capture the gas and water influx from contact. The second step is to design and optimize the packer placement based on permeability contrast as primary reference using a practical approach by setting the number of packers as a sensitivity variable with uniform DFCV setting design. It is then followed by an unbiased design workflow is to optimize benefits of all kinds of DFCV such as nozzle-based and viscosity dependent inflow control devices of zonally varying setting or optimal configuration designs. The practical approach is demonstrated on a synthetic simulation model with a horizontal well to address the oversights in modelling prior to DFCV design and optimization process. Based on this work, vertical grid resolution to oil thickness ratio exceeding 1:32 amplified the differences in results due to numerical dispersion problem. For packer location optimization, several sensitivities of different packer placements and number of packers were performed to compare the oil cumulative incremental. The optimum number of packers with uniform DFCV design is 19 packers, however the oil gain will be decreased once the number of packers is reduced. Finally, the practicality of applying a global optimization algorithm to such studies during real-time operations was investigated. A unique practical approach is presented to address pitfalls involved in the needs of high-resolution numerical simulation in DFCV optimization. This approach captures the complex physics and resolution involved while ensuring the design loop efficient enough to perform fine-tuning during run-in-hole or on-the fly design onsite. In addition, this design optimization workflow is possible due to the availability of a new standard advanced reservoir simulator, that is cloud-compliant and has efficient multi-core parallel processing which otherwise would take days if not weeks conventionally to complete the task, deemed unsuitable for near real-time design or fine-tuning needs.
解决先进完井设计优化中高分辨率数值模拟建模缺陷的实用方法
在亚洲的许多油田,应用井下流量控制装置(DFCV)已经被证明是一种成功的策略,可以缓解早期水或气的突破。这类研究通常采用传统的数值模拟工作流程。然而,由于未能适应独特的操作要求和DCFV硬件设计,一些数值上的疏忽往往无法充分挖掘井下安装的潜力。本文提出了一种实用的方法来解决高分辨率数值模拟DFCV设计优化中的缺陷。在本文中,强调了一个多阶段的过程,包括为DFCV设计和优化准备的数值模拟模型。第一步是研究3D模型的网格分辨率。这是为了确保从粗尺度到细尺度的网格-井分辨率的效果,以捕获设备沿着水平井裸眼(OH)长度的行为,并捕获接触产生的气和水流入。第二步是设计和优化封隔器的位置,以渗透率对比为主要参考,采用一种实用的方法,将封隔器的数量作为均匀DFCV坐封设计的灵敏度变量。然后是一个无偏的设计工作流程,以优化各种DFCV的优势,例如基于喷嘴和粘度的井间变化设置的流入控制装置或优化配置设计。在水平井的综合仿真模型中演示了实用方法,以解决DFCV设计和优化过程之前建模中的疏忽。在此基础上,当垂直网格分辨率与油厚比超过1:32时,由于数值色散问题,放大了结果的差异。为了优化封隔器位置,研究了不同封隔器位置和封隔器数量的敏感性,比较了原油累积增量。采用均匀DFCV设计的最佳封隔器数量为19个,但减少封隔器数量会降低原油增益。最后,探讨了在实时操作中应用全局优化算法进行此类研究的可行性。提出了一种独特的实用方法来解决DFCV优化中涉及高分辨率数值模拟的陷阱。这种方法可以捕捉复杂的物理特性和分辨率,同时确保设计回路足够高效,可以在入井或现场动态设计期间进行微调。此外,这种设计优化工作流程是可能的,因为有一种新的标准先进油藏模拟器,它兼容云计算,具有高效的多核并行处理,否则需要几天甚至几周的时间才能完成任务,不适合近实时设计或微调需求。
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