Formation and evolution of particle migration zones for different drilling fluid compositions in porous media

IF 5.6 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL
Jithin S. Kumar, Ramesh Kannan Kandasami, Jitendra S. Sangwai
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Abstract

Flow of suspensions through the complex porous network is typically characterized by the initial spurt and then the formation of internal/ external filter cake which impedes the flow velocity. The transient mechanisms involved during the particle migration phenomenon need to be studied carefully as it is crucial for effectively managing the flow characteristics of drilling fluids and their impact on subsurface reservoirs. In this study, constant pressure permeation experiments are carried out using a specially designed apparatus to quantify the formation and evolution of particle migration zones using advanced image processing algorithms. Additionally, a comprehensive pre-test and post-test characterization of drilling fluids/ filtrates and the porous medium revealed intricate insights into the dynamics of particle migration. Four distinct particle migration/ filtration zones such as internal filter cake, primary filtration, secondary filtration and fluid loss are identified based on the change in the concentration gradient. The influence of additives on the growth of these zones is quantified during the filtration process. The concentration of barite/ micronized calcium carbonate and xanthan gum predominantly controls the filtration process by enhancing the particle plugging and retention time, respectively. In addition to the in-depth understanding of the particle migration zones, the transition from kinetic to capillary flow is identified by performing the fractal analysis. The analysis revealed that drilling fluid containing more barite exhibits a dominant capillary flow. Finally, an analytical model has been modified by considering the influence of different additives to predict the depth of penetration, which is comparable with the experimental results.

Abstract Image

多孔介质中不同钻井液成分的颗粒迁移区的形成和演变
悬浮液在复杂多孔网络中流动的典型特征是最初的喷涌,然后形成内部/外部滤饼,阻碍流速。需要仔细研究颗粒迁移现象中涉及的瞬态机制,因为这对有效管理钻井液的流动特性及其对地下储层的影响至关重要。在这项研究中,使用专门设计的仪器进行了恒压渗透实验,利用先进的图像处理算法对颗粒迁移区的形成和演变进行量化。此外,还对钻井液/滤液和多孔介质进行了全面的试验前和试验后表征,揭示了颗粒迁移动态的深刻内涵。根据浓度梯度的变化,确定了四个不同的颗粒迁移/过滤区,如内部滤饼、一次过滤、二次过滤和流体流失。在过滤过程中,对添加剂对这些区域增长的影响进行了量化。重晶石/微粉碳酸钙和黄原胶的浓度分别通过增强颗粒堵塞和保留时间来控制过滤过程。除了深入了解颗粒迁移区外,还通过分形分析确定了从动能流到毛细管流的过渡。分析结果表明,含重晶石较多的钻井液主要表现为毛细管流。最后,考虑到不同添加剂的影响,对分析模型进行了修改,以预测渗透深度,结果与实验结果相当。
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来源期刊
Acta Geotechnica
Acta Geotechnica ENGINEERING, GEOLOGICAL-
CiteScore
9.90
自引率
17.50%
发文量
297
审稿时长
4 months
期刊介绍: Acta Geotechnica is an international journal devoted to the publication and dissemination of basic and applied research in geoengineering – an interdisciplinary field dealing with geomaterials such as soils and rocks. Coverage emphasizes the interplay between geomechanical models and their engineering applications. The journal presents original research papers on fundamental concepts in geomechanics and their novel applications in geoengineering based on experimental, analytical and/or numerical approaches. The main purpose of the journal is to foster understanding of the fundamental mechanisms behind the phenomena and processes in geomaterials, from kilometer-scale problems as they occur in geoscience, and down to the nano-scale, with their potential impact on geoengineering. The journal strives to report and archive progress in the field in a timely manner, presenting research papers, review articles, short notes and letters to the editors.
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