Abstract Understanding near-wellbore hydraulic fracture behaviors is vital for hydraulic fracturing treatments and other injection-related operations in the petroleum industry. This paper presents a fully coupled fluid flow and geomechanics model for growth of hydraulic fractures in the near-wellbore region. The model is developed within the framework of the extended finite element method (XFEM). Fracture initiation and propagation, fracturing fluid flow, rock deformation, and pore fluid flow are coupled into the XFEM framework. The model is validated against experimental results in the literature. Capabilities of the proposed model for capturing fracture geometry, fluid flow, and local stress and pore pressure distributions are illustrated with numerical examples. A parametric study is carried out using the model to investigate a few operational parameters’ effects on near-wellbore fractures. Some recommendations are provided for reducing fracture tortuosity and breakdown pressure based on the results of the parametric study. The XFEM model proposed in this paper provides an efficient tool to predict arbitrary hydraulic fracture growth in the wellbore vicinity. It can be used to aid designs of various hydraulic fracturing related operations in the petroleum industry, such as fracturing stimulations, injectivity tests, waterfloods, and waste injections.

中文翻译：

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多孔弹性介质中井眼弯曲水力压裂扩展的建模

摘要 了解近井眼水力压裂行为对于石油工业中的水力压裂处理和其他与注入相关的操作至关重要。本文提出了一个完全耦合的流体流动和地质力学模型，用于近井区水力压裂的生长。该模型是在扩展有限元方法 (XFEM) 的框架内开发的。裂缝起裂和扩展、压裂流体流动、岩石变形和孔隙流体流动耦合到 XFEM 框架中。该模型根据文献中的实验结果进行了验证。所提出的模型用于捕获裂缝几何形状、流体流动以及局部应力和孔隙压力分布的能力通过数值示例进行了说明。使用该模型进行了参数研究，以研究一些操作参数对近井眼裂缝的影响。根据参数研究的结果，提出了一些降低裂缝曲折度和破裂压力的建议。本文提出的 XFEM 模型提供了一种有效的工具来预测井眼附近的任意水力压裂增长。它可用于辅助石油工业中各种水力压裂相关操作的设计，例如压裂增产、注入测试、注水和废物注入。本文提出的 XFEM 模型提供了一种有效的工具来预测井眼附近的任意水力压裂增长。它可用于辅助石油工业中各种水力压裂相关操作的设计，例如压裂增产、注入测试、注水和废物注入。本文提出的 XFEM 模型提供了一种有效的工具来预测井眼附近的任意水力压裂增长。它可用于辅助石油工业中各种水力压裂相关操作的设计，例如压裂增产、注入测试、注水和废物注入。