页岩油地层压裂液自吸机理：多尺度视角综述,Energy & Fuels

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页岩油地层压裂液自吸机理：多尺度视角综述
Energy & Fuels ( IF 5.2 ) Pub Date : 2023-07-10 , DOI: 10.1021/acs.energyfuels.3c00502
Yuxuan Yang ₁ , Sen Wang _{1,

2} , Qihong Feng _{1,

2,

3} , Xiaopeng Cao _{1,

4,

5} , Yong Qin ₆ , Chenglong Shu ₇ , Anhai Zhong ₈ , Xuewu Wang ₃

Affiliation

北美页岩油的突破引发了世界范围的能源革命。与常规储层相比，页岩储层表现出多尺度特征和较大比例的纳米孔隙，这使得页岩储层内压裂液的自吸机制异常复杂。例如，压裂液在不同尺度上表现出明显的自吸行为。传统模型在吸吸表征方面面临重大挑战。从多尺度角度理解页岩油地层的渗吸机制有助于充分利用其积极作用并提高石油采收率。我们回顾了页岩储层从纳米尺度到储层尺度的渗吸机制。阐明了单纳米孔内的自吸原理以及对传统表征模型的改进。然后，在孔隙尺度上，我们详细阐述了从微流控芯片、孔隙网络模型和直接模拟中获得的吸入定律。我们还概述了核心尺度的吸入动力学、毛细管力和渗透压的影响以及孔隙结构的变化。最后，介绍了油藏尺度的渗吸行为以及考虑渗吸效应的现场实例。我们分析每个尺度上存在的问题并讨论该领域的未来趋势。本文旨在帮助读者系统地了解不同规模页岩油藏压裂液自吸机理和行为，加速页岩资源的开发利用。

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Imbibition Mechanisms of Fracturing Fluid in Shale Oil Formation: A Review from the Multiscale Perspective

The breakthrough of shale oil in North America led to a worldwide energy revolution. Shale reservoirs show multiscale properties and a large proportion of nanopores compared to conventional reservoirs, which makes the imbibition mechanisms of fracturing fluids within shale reservoirs exceptionally complicated. For instance, the fracturing fluid shows a distinct imbibition behavior at different scales. Traditional models face significant challenges in imbibition characterization. Understanding the imbibition mechanisms in shale oil formations from a multiscale perspective can help to make full use of the positive effect and enhance oil recovery. We review imbibition mechanisms in shale reservoirs from the nanoscale to the reservoir scale. The imbibition principles in a single nanopore and the improvement of the traditional characterization models are clarified. Then, at the pore scale, we elaborate on the imbibition laws obtained from the microfluidic chip, pore network model, and direct simulations. We also outline the imbibition dynamics at the core scale, the influences of capillary forces and osmotic pressure, and the variations of the pore structure. Finally, the imbibition behavior at the reservoir scale and field examples considering the imbibition effect are introduced. We analyze the existing problems on each scale and discuss the future trends in this area. This work is expected to help readers systematically understand the mechanisms and behavior of fracturing fluid imbibition in shale oil reservoirs at different scales and accelerate the exploitation of shale resources.

更新日期：2023-07-10

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