<br>基于REV渗透率模型的地面井选型与布局优化时空关系,ACS Omega

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基于REV渗透率模型的地面井选型与布局优化时空关系
ACS Omega ( IF 3.7 ) Pub Date : 2023-11-20 , DOI: 10.1021/acsomega.3c07143
Wei Wang ₁ , Xufei Lu ₁ , Xiangjun Chen ₂ , Liang Wang ₃ , Zhiming Fang ₄ , Qi Li ₄ , Xiaochun Li ₄

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我国清水盆地是煤层气勘探的热点地区，地面井的选择和布置是抽采过程中至关重要的工程问题。为了解决这个问题，本研究建立了几种基于代表性单元体积（REV）应变关系的新型煤渗透率模型，并讨论了渗透率的演化机制。分析了排水过程中渗透率时空演化规律，提出了基于工作面预排水时间的地面井选择和布置方法。结果表明，在渗透率模型中，REV的体积应变与其各自裂缝的体积应变呈线性相关，相关系数代表裂缝的初始孔隙度。排水过程中近地表井煤层渗透率的变化规律与吸附应变的变化趋势密切相关。此外，地面井的选择和布置与工作面预排水时间相关，包括直井的最小数量和位置，以及水平井的最佳长度。研究结果为提高煤层气抽采效率提供了宝贵的见解。

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Spatiotemporal Relationship for Well-Type Selection and Layout Optimization of Surface Wells Based on the REV Permeability Model

The Qingshui Basin in China is a hotspot for coalbed methane exploration, and the selection and arrangement of the surface well are crucial engineering issues for the drainage process. To address this, the present study establishes several novel coal permeability models based on the strain relationship of representative elementary volumes (REV) and discusses the evolution mechanism of permeability. Moreover, the spatiotemporal evolution patterns of permeability during the drainage process are analyzed, and a methodology is presented for the selection and arrangement of a surface well based on the predrainage time at the working face. The results indicate that in the permeability model, the volumetric strain of REV is linearly correlated with the volumetric strain of their respective fractures, with the correlation coefficient representing the initial fracture porosity. The variation pattern of coal permeability near surface wells during the drainage process is closely aligned with the trend of the adsorption strain. Additionally, the selection and arrangement of surface wells are correlated with the predrainage time at the working face, including the minimum number and location of vertical wells, as well as the optimal length of horizontal wells. The research findings provide valuable insights into enhancing the efficiency of coalbed methane drainage.

更新日期：2023-11-20

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