Insight into the dynamic tensile behavior of deep anisotropic shale reservoir after water-based working fluid cooling

IF 7 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL International Journal of Rock Mechanics and Mining Sciences Pub Date : 2024-08-22 DOI:10.1016/j.ijrmms.2024.105875
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Abstract

During deep shale gas production, flowing water-based working fluid inevitably cools shale reservoirs around boreholes and some fractures, and possible extraction methods induce dynamic stresses. To understand the dynamic tensile behavior of deep anisotropic shale reservoir after water-based working fluid cooling, a split Hopkinson pressure bar was used for performing the dynamic Brazilian tests on shale samples with bedding angles of 0°, 30°, 45°, 60° and 90° after reservoir temperature realization (25–200 °C) and water cooling. The results illustrate that dynamic tensile strength of shale samples decreases gradually as reservoir temperature increases under the loading rates 100–1000 GPa/s. From room temperature to 200 °C the most strength deterioration appears on samples with the bedding angle of 90°. A dynamic tensile strength deterioration model for deep shale reservoirs after water-based working fluid cooling is proposed considering the influence of loading rate and bedding angle. Geometrical trajectories of the main failure cracks are separated into three types, i.e., fully central tensile failure, tensile-shear failure and fully shear failure (sliding of bedding planes). For samples with bedding angles of 30°, 45° and 60°, increasing reservoir temperature encourages tensile failure to change into shear failure. The roles that bedding planes play in interacting with failure crack growth are summarized as IP mode (intersecting propagation), TP mode (turning propagation) and PP mode (promoting propagation). Anisotropic dynamic tensile strength responses are systematically discussed by using thermal stress simulation in ABAQUS, microstructure analyses, crack interaction conditions and the one-dimensional stress wave propagation theory. Based on experimental observations, field implications in borehole stability and fracturing of deep shale reservoirs are proposed under medium and high loading rates. This work is instrumental in providing valuable information and technology assistance for real deep shale gas production projects.

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水基工作液冷却后深层各向异性页岩储层动态拉伸行为透视
在深层页岩气生产过程中,流动的水基工作液不可避免地会冷却钻孔和一些裂缝周围的页岩储层,可能的开采方法会引起动应力。为了解深层各向异性页岩储层在水基工作液冷却后的动态拉伸行为,在储层温度实现(25-200 °C)和水冷却后,使用分体式霍普金森压力棒对基底角为 0°、30°、45°、60°和 90°的页岩样品进行了巴西动态试验。结果表明,在 100-1000 GPa/s 的加载速率下,页岩样品的动态拉伸强度随着储层温度的升高而逐渐降低。从室温到 200 °C,强度下降最多的是基底角为 90° 的样品。考虑到加载速率和铺层角度的影响,提出了水基工作液冷却后深层页岩储层动态拉伸强度劣化模型。主要破坏裂缝的几何轨迹分为三种类型,即完全中心拉伸破坏、拉伸-剪切破坏和完全剪切破坏(垫层平面滑动)。对于基底角为 30°、45° 和 60°的样品,储层温度的升高会促使拉伸破坏转变为剪切破坏。垫层平面与破坏裂纹生长的相互作用可概括为 IP 模式(相交扩展)、TP 模式(转向扩展)和 PP 模式(促进扩展)。通过使用 ABAQUS 中的热应力模拟、微观结构分析、裂纹相互作用条件和一维应力波传播理论,系统地讨论了各向异性动态拉伸强度响应。根据实验观察结果,提出了在中高加载率条件下深层页岩储层井眼稳定性和压裂的现场意义。这项工作有助于为实际的深层页岩气生产项目提供有价值的信息和技术帮助。
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来源期刊
CiteScore
14.00
自引率
5.60%
发文量
196
审稿时长
18 weeks
期刊介绍: The International Journal of Rock Mechanics and Mining Sciences focuses on original research, new developments, site measurements, and case studies within the fields of rock mechanics and rock engineering. Serving as an international platform, it showcases high-quality papers addressing rock mechanics and the application of its principles and techniques in mining and civil engineering projects situated on or within rock masses. These projects encompass a wide range, including slopes, open-pit mines, quarries, shafts, tunnels, caverns, underground mines, metro systems, dams, hydro-electric stations, geothermal energy, petroleum engineering, and radioactive waste disposal. The journal welcomes submissions on various topics, with particular interest in theoretical advancements, analytical and numerical methods, rock testing, site investigation, and case studies.
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