柴204井区页岩储层现场压裂液伤害机理
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TE344

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国家科技重大专项课题(项目编号2017ZX05009-004)。


Research on the on-site fracturing fluid damage mechanism of shale reservoirs in Chai 204 well area
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    摘要:

    柴达木西部干柴沟组页岩储层富含油气,目前现场使用压裂液对该储层适应性未明确,现有行业标准对致密页岩储层伤害评价不完全适用,故结合多种成像技术明确现场压裂液对该储层伤害程度和伤害机理。通过实验测定了储层的孔渗特征和矿物组成;将驱替伤害实验与核磁、CT扫描和电镜MAPS扫描结合深入分析了压裂液的侵入深度和伤害机理。研究结果表明:储层基质孔隙度、渗透率极低,粘土矿物含量较高且非均质性强;胍胶和滑溜水均会对岩心渗透率造成很大伤害,压裂液侵入量和侵入深度均不大,伤害主要发生在岩心进液端面,端面孔隙伤害严重; 压裂液对储层的伤害主要通过对裂缝表面的封堵,滑溜水压裂液以液相伤害为主,胍胶压裂液存在明显的液相伤害和固相堵塞,对孔隙伤害相较滑溜水更大。本文提供了一整套完整的从整体到局部的压裂液对页岩储层伤害的研究方法,为页岩储层伤害评价提供了方法参考。

    Abstract:

    The Ganchaigou Formation shale reservoir in western Qaidam is rich in oil and gas. Currently, the adaptability of fracturing fluid used on site to this reservoir is not clear, and existing industry standards are not fully applicable to the evaluation of damage to ultra tight shale reservoirs. Therefore, multiple imaging techniques are combined to clarify the degree and mechanism of damage caused by fracturing fluid to this reservoir. The pore permeability characteristics and mineral composition of the reservoir were determined through experiments; By combining displacement damage experiments with nuclear magnetic resonance, CT scanning, and electron microscopy MAPS scanning, we will conduct in-depth analysis of the invasion depth and damage mechanism of the fracturing fluid. The research results indicate that the porosity and permeability of the core matrix are extremely low, belonging to ultra dense shale, with a high content of clay minerals and strong heterogeneity; Both guanidine gum and slippery water can cause significant damage to the permeability of the core. The amount and depth of fracturing fluid invasion are not significant, and the damage mainly occurs at the end face of the core,

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褚占宇,蒋建方,刘金栋,等. 柴204井区页岩储层现场压裂液伤害机理[J]. 科学技术与工程, 2024, 24(28): 12112-12118.
Chu Zhanyu, Jiang Jianfang, Liu Jindong, et al. Research on the on-site fracturing fluid damage mechanism of shale reservoirs in Chai 204 well area[J]. Science Technology and Engineering,2024,24(28):12112-12118.

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  • 收稿日期:2024-01-10
  • 最后修改日期:2024-08-02
  • 录用日期:2024-02-01
  • 在线发布日期: 2024-11-05
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