非均匀缝宽复杂裂缝内支撑剂铺置规律数值模拟
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1.西南石油大学油气藏地质及开发工程全国重点实验室;2.西南石油大学机电工程学院

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TE357.2

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四川省科技计划项目“页岩压裂的损伤力学特征研究”(2020JDJQ0059)


Numerical simulation of proppant laying law in complex cracks with non-uniform joint width
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National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University

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    摘要:

    支撑剂的有效铺置是形成具有高导流能力的人工裂缝的关键。根据目前压裂结果表明人工裂缝的缝宽是变化的,支撑剂在非等缝宽裂缝中运移铺置规律不明。本文建立了非均匀缝宽复杂裂缝模型,基于欧拉液固两相流方法,通过与物理实验结果对比验证了模型的一致性。分析了支撑剂在非均匀缝宽复杂裂缝中泵注排量、支撑剂粒径、携砂液砂比、压裂液黏度影响下的铺置规律,并通过无因次有效支撑裂缝体积评价了因素影响大小。结果表明:(1)对砂堤形态来说,泵注排量增大,平衡高度降低,裂缝近端的无砂区域会增大;支撑剂粒径增大,平衡高度增加,粒径较大时可能会造成砂堵现象导致裂缝远端无砂;携砂液砂比增大,平衡高度增加,支撑剂的铺置均匀性增大;压裂液粘度增大,平衡高度降低,支撑剂可以更加均匀的在裂缝远端铺置。(2)对无因次有效支撑裂缝体积来说,泵注排量和压裂液粘度表现为线性负相关,携砂液砂比和支撑剂粒径表现为线性正相关。相比其他参数,支撑剂粒径的改变对无因次支撑裂缝体积影响最大。(3)为了最优化的提高人工裂缝导流能力,建议初期采用小粒径支撑剂、低砂比、高排量、高粘度压裂液泵注,保证支撑剂更好的在裂缝远端均匀铺置。后期采用大粒径支撑剂、高砂比、低排量、低粘度压裂液泵注,保证支撑剂在近井筒区域饱满填充。

    Abstract:

    : Effective placement of proppant is the key to the formation of artificial cracks with high conductivity. According to the current fracturing results, the joint width of artificial cracks is variable, and the proppant migration and placement law in non-equal width cracks is unknown. In this paper, a non-uniform seam width complex fracture model is established, and the consistency of the model is verified by comparison with the physical experiment results based on the Euler liquid-solid two-phase flow method. The placement law of proppant under the influence of pump displacement, proppant particle size, sand-carrying liquid-sand ratio and fracturing fluid viscosity in non-uniform joint width and complex cracks was analyzed, and the influence of factors was evaluated by the volume of effective support cracks without factoring. The results show that: (1) For the morphology of the sand bank, the pumping displacement increases, the equilibrium height decreases, and the sand-free area near the fracture increases; The particle size of proppant increases, the equilibrium height increases, and when the particle size is large, it may cause sand plugging phenomenon, resulting in no sand at the far end of the crack; The ratio of sand carrying liquid and sand increases, the equilibrium height increases, and the uniformity of proppant placement increases. The viscosity of the fracturing fluid increases, the equilibrium height decreases, and the proppant can be more evenly distributed at the far end of the crack. (2) For the volume of effective support cracks without factor, the pumping displacement and fracturing fluid viscosity showed a linear negative correlation, and the sand-carrying liquid sand ratio and proppant particle size showed a linear positive correlation. Compared with other parameters, the change of proppant particle size has the greatest effect on the volume of undifferentiated support cracks. (3) In order to optimize the ability to conduct artificial cracks, it is recommended to use small particle size proppant, low sand ratio, high displacement, and high viscosity fracturing fluid pumping in the early stage to ensure that the proppant is better evenly laid at the far end of the crack. In the later stage, large particle size proppant, high sand ratio, low displacement, low viscosity fracturing fluid pump injection is used to ensure that the proppant is fully filled in the near-wellbore area.

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杨兆中,钟鹏,易良平,等. 非均匀缝宽复杂裂缝内支撑剂铺置规律数值模拟[J]. 科学技术与工程, , ():

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  • 收稿日期:2023-09-26
  • 最后修改日期:2024-05-15
  • 录用日期:2024-05-21
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