基于煤的各向异性预测开槽定向水力压裂裂缝起始压力

IF 2.6 3区 工程技术 Q3 ENERGY & FUELS
Jingwei Zheng, Z. Ge, Yiyu Lu, Zhou Zhe, Jing Zhou, Wenyu Fu
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引用次数: 0

摘要

裂缝起裂压力的准确估计是煤层开槽定向水力压裂方法有效实施的关键。然而,目前的模型未能考虑开槽钻孔形态和煤的各向异性的影响。为了解决这一问题,本研究建立了一个三维模型,将开槽井简化为椭圆介质,将煤简化为正交异性介质。通过室内实验对模型进行了验证,并给出了各种因素对起裂压力和起裂角变化的影响结果。模型的计算结果与实验结果的观测规律一致,数值误差在7%的可接受范围内,表明了模型的精度。水平应力差的增大和裂缝深度的减小将导致裂缝起裂压力和裂缝挠度的升高。此外,开缝角还会影响起裂压力和挠曲角的分布规律,凸显了这些因素在开缝井水力压裂中的重要性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Prediction of fracture initiation pressure for slotting-directional hydraulic fracturing based on the anisotropy of coal
The precise estimation of fracture initiation pressure is crucial for the effective implementation of slotting-directional hydraulic fracturing methods in coal seams. Nonetheless, current models fail to account for the impact of the morphology of the slotted borehole and the anisotropy of coal. To address this issue, a three-dimensional model was created in this study, which simplified the slotted borehole as an elliptical medium and the coal as an orthotropic medium. Laboratory experiments were conducted to validate the model, and the findings regarding the changes in fracture initiation pressure and deflection angle due to various factors were presented. The calculated outcomes of the proposed model align with the observed pattern of the experimental results, and the numerical discrepancy falls within the acceptable range of 7%, showcasing the precision of the proposed model. A rise in the horizontal stress difference and a decrease in the depth of the slots will result in an elevation of the fracture initiation pressure and deflection angle. Additionally, the slotting angle will impact the distribution pattern of the fracture initiation pressure and deflection angle, underscoring the significance of these factors in the hydraulic fracturing of slotted boreholes.
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来源期刊
CiteScore
6.40
自引率
30.00%
发文量
213
审稿时长
4.5 months
期刊介绍: Specific areas of importance including, but not limited to: Fundamentals of thermodynamics such as energy, entropy and exergy, laws of thermodynamics; Thermoeconomics; Alternative and renewable energy sources; Internal combustion engines; (Geo) thermal energy storage and conversion systems; Fundamental combustion of fuels; Energy resource recovery from biomass and solid wastes; Carbon capture; Land and offshore wells drilling; Production and reservoir engineering;, Economics of energy resource exploitation
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