Laboratory Investigation of Impact of Slickwater Composition on Multiphase Permeability Evolution in Tight Sandstones

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
K. Abaa, J. Wang, D. Elsworth, M. Ityokumbul
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引用次数: 3

Abstract

Fracturing fluid filtrate that leaks off during injection is imbibed by strong capillary forces present in low-permeability sandstones and may severely reduce the effective gas permeability during cleanup and post-fracture production. This work aims to investigate the role fracturing fluid filtrate from slickwater has on rock-fluid and fluid-fluid interactions and to quantify the resulting multiphase permeability evolution during imbibition and drainage of the filtrate by means of specialized core laboratory techniques. Three suites of experiments were conducted. In the first suite of experiments, a fluid leakoff test was conducted on selected core samples to determine the extent of polymer invasion and leakoff characteristics. In the second suite, multigas relative permeability measurements were conducted on sandstone plugs saturated with fracturing fluid filtrate. A combination of controlled fluid evaporation and pulse decay permeability technique was used to measure liquid and gas effective permeabilities for both drainage and imbibition cycles. These experiments aim to capture dynamic permeability evolution during invasion and cleanup of fracturing fluid (slickwater). The final suite of experiments consists of adsorption flow tests to investigate, identify, and quantify possible mechanisms for adsorption of the polymeric molecules of friction reducers present in the fluid filtrate to the pore walls of the rock sample. Imbibition tests and observations of contact angles were conducted to validate possible wettability changes. Results from multiphase permeability flow tests show an irreversible reduction in endpoint brine permeability and relative permeability with increasing concentration of friction reducer. Our results also show that effective gas permeability during drainage/cleanup of the imbibed slickwater fluid is controlled to a large degree by trapped gas saturation than by changes in interfacial tension. Adsorption flow tests identified adsorption of polymeric molecules of the friction reducer present in the fluid to the pore walls of the rock. The adsorption friction reducer increases the wettability of the rock surface and results in the reduction of liquid relative permeability. The originality of this work is to diagnose formation damage mechanisms from laboratory experiments that adequately capture multiphase permeability evolution specific to a slickwater fluid system, during imbibition and cleanup. This will be useful in optimizing fracturing fluid selection.
裂隙水组成对致密砂岩多相渗透率演化影响的室内研究
注入过程中泄漏的压裂液滤液被低渗透砂岩中存在的强大毛细力所吸收,可能会严重降低清理和压裂后生产过程中的有效渗透率。这项工作旨在研究滑溜水中压裂液滤液对岩石-流体和流体-流体相互作用的作用,并通过专门的岩心实验室技术量化滤液吸排过程中产生的多相渗透率演化。进行了三组实验。在第一组实验中,对选定的岩心样品进行了流体泄漏测试,以确定聚合物侵入的程度和泄漏特征。在第二套井中,对饱和压裂液滤液的砂岩桥塞进行了多种气体相对渗透率测量。采用可控流体蒸发和脉冲衰减渗透率技术相结合的方法,测量了排吸循环的液体和气体有效渗透率。这些实验旨在捕捉压裂液(滑溜水)侵入和清理过程中渗透率的动态变化。最后一组实验包括吸附流动测试,以调查、识别和量化流体滤液中摩擦减速器的聚合物分子吸附到岩石样品孔壁上的可能机制。进行了渗吸试验和接触角观察,以验证可能的润湿性变化。多相渗透流动试验结果表明,随着摩擦减速器浓度的增加,终端盐水渗透率和相对渗透率不可逆地降低。我们的研究结果还表明,在吸入滑溜水的排水/净化过程中,有效渗透率在很大程度上受捕获气饱和度的控制,而不是界面张力的变化。吸附流动测试发现,流体中存在的摩擦减速器的聚合物分子吸附到岩石的孔壁上。吸附减摩剂增加了岩石表面的润湿性,导致液体相对渗透率降低。这项工作的独创性在于通过实验室实验来诊断地层损伤机制,充分捕捉滑溜水系统在吸胀和清理过程中的多相渗透率演化。这将有助于优化压裂液的选择。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Accounts of Chemical Research
Accounts of Chemical Research 化学-化学综合
CiteScore
31.40
自引率
1.10%
发文量
312
审稿时长
2 months
期刊介绍: Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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