同时激发的多条液压裂缝之间的竞争:考虑流体分区的 DEM 模拟的启示

IF 3.4 2区 工程技术 Q2 ENGINEERING, GEOLOGICAL
Xuejian Li, Kang Duan, Moli Zhao, Qiangyong Zhang, Luchao Wang, Rihua Jiang
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引用次数: 0

摘要

从水平井的多个射孔中刺激长而持久的裂缝,对于提高非常规储层的碳氢化合物采收率起着至关重要的作用。然而,裂缝之间的相互作用可能会导致严重的不均匀性,但驱动这种竞争的机制仍未得到解释。我们提出了一种改进的二维离散元素模型,用于模拟同一压裂阶段射孔间的流体竞争和应力相互作用。流体分区是通过动态地将注入流体分成不同的射孔来实现的,以保持压力一致性和流体守恒性。通过将诱导应力、裂缝孔径、裂缝高度和注入压力的演变与理论模型进行比较,对模型进行了验证。系统研究了射孔摩擦、流体粘度和注入速度的影响。模拟结果表明,流体竞争倾向于刺激一个主要裂缝,其他射孔受到抑制。增加射孔摩擦力对促进流体分隔的效果并不显著,而使用粘度更高的压裂液则有助于在射孔处形成更多裂缝。随着注入率的提高,所有裂缝都能扩展到边界,但不对称的裂缝模式无法避免。通过改变操作参数,可区分出四种典型的压裂模式。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Competition among simultaneously stimulated multiple hydraulic fractures: Insights from DEM simulation with the consideration of fluid partitioning

Stimulating long and persistent fractures from multiple perforations in horizontal wells plays a vital role in enhancing the recovery of hydrocarbons from unconventional reservoirs. However, interaction among fractures may lead to dramatic nonuniformity, but the mechanism that drives the competition still eludes explanation. We proposed an improved two-dimensional discrete element model to simulate fluid competition and stress interaction among perforations in the same fracturing stage. The fluid partitioning is implemented by dynamically dividing the injected fluid into different perforations to maintain pressure consistency and fluid conservation. The model is validated by comparing the induced stress, fracture aperture, and the evolution of the fracture height and the injection pressure with theoretical models. The influences of the perforation friction, fluid viscosity and injection rate are examined systematically. Simulation results reveal that fluid competition tends to stimulate one dominant fracture with other perforations suppressed. The effect of increasing the perforation friction for promoting the fluid partitioning is not remarkable while using more viscous fracturing fluid helps to initiate more fractures at the perforations. With a higher injection rate all fractures can propagate to the borders but the asymmetrical fracture pattern cannot be avoided. Four typical fracture patterns are distinguished by changing operational parameters.

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来源期刊
CiteScore
6.40
自引率
12.50%
发文量
160
审稿时长
9 months
期刊介绍: The journal welcomes manuscripts that substantially contribute to the understanding of the complex mechanical behaviour of geomaterials (soils, rocks, concrete, ice, snow, and powders), through innovative experimental techniques, and/or through the development of novel numerical or hybrid experimental/numerical modelling concepts in geomechanics. Topics of interest include instabilities and localization, interface and surface phenomena, fracture and failure, multi-physics and other time-dependent phenomena, micromechanics and multi-scale methods, and inverse analysis and stochastic methods. Papers related to energy and environmental issues are particularly welcome. The illustration of the proposed methods and techniques to engineering problems is encouraged. However, manuscripts dealing with applications of existing methods, or proposing incremental improvements to existing methods – in particular marginal extensions of existing analytical solutions or numerical methods – will not be considered for review.
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