页岩的吸水和采油:利用厘米到纳米尺度集成成像的动力学和机制

IF 2.1 4区 工程技术 Q3 ENERGY & FUELS
S. Peng, J. LaManna, P. Periwal, P. Shevchenko
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引用次数: 2

摘要

在页岩油藏水力压裂后以及水基提高采收率(EOR)过程中,吸水及驱油是一个重要的过程。目前的吸积测量技术大多是“黑盒”式的方法。需要更明确地了解吸水/采油动态和地质控制。本文采用从厘米到纳米尺度(岩心到孔隙尺度)的多尺度成像技术,结合中子x线摄影技术、微ct技术和扫描电镜技术,对页岩样品的渗吸深度、渗吸速率及渗吸非均质性原因进行了研究。研究了1-in井内吸水的动态过程。(25.4 mm)岩心样品清晰显示,并通过中子射线图像分析区分了沿基质渗吸和微裂缝渗吸。通过显微ct和SEM图像分析,对直径1.5 mm的1-in油管不同层状微塞样品进行了进一步研究。核心样品。在图像分析的基础上,计算了渗吸深度和渗吸速率。以某页岩油田为例,进行了页岩基质吸水采收率估算。这种创新的集成多尺度成像技术提供了一种“白/灰盒”方法来了解页岩的吸水性和水-油驱替。该技术的宽长度范围(从厘米到纳米)使我们能够更全面、更准确、更具体地了解岩心尺度动力学和孔隙尺度的吸水、采油和基质-裂缝相互作用机制。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Water Imbibition and Oil Recovery in Shale: Dynamics and Mechanisms Using Integrated Centimeter-to-Nanometer-Scale Imaging
Water imbibition, and the associated oil displacement, is an important process in shale oil reservoirs after hydraulic fracturing and in water-based enhanced oil recovery (EOR). Current techniques for water imbibition measurement are mostly “black-box”-type methods. A more explicit understanding of the water imbibition/oil recovery dynamics and geological controls is in demand. In this paper, a multiscale imaging technique that covers centimeter to nanometer scale (i.e., core to pore scale), integrating neutron radiography, microcomputed tomography (micro-CT), and scanning electron microscope (SEM) is applied to investigate the water imbibition depth and rate and the cause of heterogeneity of imbibition in shale samples. The dynamic processes of water imbibition in the 1-in. (25.4-mm) core sample were explicitly demonstrated, and the imbibition along the matrix and imbibition through microfractures are distinguished through neutron radiography image analysis. The causes of observed imbibition heterogeneity were further investigated through micro-CT and SEM image analysis for 1.5-mm diameter miniplug samples from different laminas of the 1-in. core samples. Imbibition depth and rate were calculated on the basis of image analysis as well. Estimation of oil recovery through water imbibition in shale matrix was performed for an example shale field. This innovative and integrated multiscale imaging technique provides a “white/gray-box” method to understand water imbibition and water-oil displacement in shale. The wide span of the length scale (from centimeter to nanometer) of this technique enables a more comprehensive, accurate, and specific understanding of both the core-scale dynamics and pore-scale mechanisms of water imbibition, oil recovery, and matrix-fracture interaction.
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来源期刊
CiteScore
5.30
自引率
0.00%
发文量
68
审稿时长
12 months
期刊介绍: Covers the application of a wide range of topics, including reservoir characterization, geology and geophysics, core analysis, well logging, well testing, reservoir management, enhanced oil recovery, fluid mechanics, performance prediction, reservoir simulation, digital energy, uncertainty/risk assessment, information management, resource and reserve evaluation, portfolio/asset management, project valuation, and petroleum economics.
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