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川西须家河组致密砂岩高温后的物理力学特征参数试验研究

于鑫 李皋 陈泽 张毅

于鑫, 李皋, 陈泽, 等, 2021. 川西须家河组致密砂岩高温后的物理力学特征参数试验研究. 地质力学学报, 27 (1): 1-9. DOI: 10.12090/j.issn.1006-6616.2021.27.01.001
引用本文: 于鑫, 李皋, 陈泽, 等, 2021. 川西须家河组致密砂岩高温后的物理力学特征参数试验研究. 地质力学学报, 27 (1): 1-9. DOI: 10.12090/j.issn.1006-6616.2021.27.01.001
YU Xin, LI Gao, CHEN Ze, et al., 2021. Experimental study on physical and mechanical characteristics of tight sandstones in the Xujiahe Formation in western Sichuan after high-temperature exposure. Journal of Geomechanics, 27 (1): 1-9. DOI: 10.12090/j.issn.1006-6616.2021.27.01.001
Citation: YU Xin, LI Gao, CHEN Ze, et al., 2021. Experimental study on physical and mechanical characteristics of tight sandstones in the Xujiahe Formation in western Sichuan after high-temperature exposure. Journal of Geomechanics, 27 (1): 1-9. DOI: 10.12090/j.issn.1006-6616.2021.27.01.001

川西须家河组致密砂岩高温后的物理力学特征参数试验研究

doi: 10.12090/j.issn.1006-6616.2021.27.01.001
基金项目: 

国家自然科学基金项目 51674217

详细信息
    作者简介:

    于鑫(1996-), 男, 硕士, 主要从事油气井工程中岩石热处理等相关研究。E-mail: 954373095@qq.com

    通讯作者:

    李皋(1976-), 男, 博士, 研究员, 主要从事油气井储层保护、欠平衡钻井等相关研究。E-mail: lgmichael@263.net

  • 中图分类号: TU45;TE31

Experimental study on physical and mechanical characteristics of tight sandstones in the Xujiahe Formation in western Sichuan after high-temperature exposure

  • 摘要: 为了在井下加热改善近井区域渗流能力以提高低渗透油气藏开采效率的同时保证井壁稳定,研究了高温对四川隆昌须家河组须二段致密砂岩微观结构、力学性质及渗透性的影响,对26~1000℃高温处理后的试样进行了热重分析、电镜扫描分析(SEM)、声波测试、物理参数测定、单轴压缩试验及渗透率测试,分析高温后试样的组分、微观结构、力学参数及渗透率与温度的相关性。结果表明:在26~1000℃范围内,致密砂岩试样随温度升高不断脱去内部水分,粘土矿物含量分阶段减少,进而造成试样质量减小、视密度降低;致密砂岩岩石性能在400℃左右存在一个阈值温度,当致密砂岩高于400℃时,其抗压强度及抗变形能力急剧降低;内部裂缝网络随着温度的增高,裂缝数量不断增多,裂缝网络规模不断增大,导致高温后岩样渗透率不断增加,且增速随温度不断增大,表明将油气井加热温度控制在400℃以上并增大加热范围有利于提高单井产能。研究结果可为致密砂岩气藏中实施电加热增产技术时判断井筒安全性及单井产能增产效果提供一定参考。

     

  • 图  1  经历不同温度后试样表观颜色变化

    Figure  1.  Colors of the samples after exposing to high temperatures

    图  2  高温后岩样矿物含量变化图

    Figure  2.  Variation diagram of mineral contents after exposing to high temperatures

    图  3  岩样热重分析结果

    Figure  3.  Thermogravimetric analysis results for the samples

    图  4  高温后致密砂岩微观结构特征

    Figure  4.  Microstructure characteristics of tight sandstones after exposing to high temperatures

    图  5  试样质量与温度的关系

    Figure  5.  Effect of temperature on sample quality

    图  6  试样体积与温度的关系

    Figure  6.  Effect of temperature on sample volume

    图  7  试样视密度与温度的关系

    Figure  7.  Effect of temperature on apparent density

    图  8  试样波速与温度的关系

    Figure  8.  Effect of temperature on wave velocity

    图  9  高温后试样单轴应力-应变关系曲线

    Figure  9.  Diagram showing the uniaxial stress-strain curves of the samples after exposing to high temperatures

    图  10  试样单轴抗压强度与温度的关系

    Figure  10.  Effect of temperature on uniaxial compressive strength

    图  11  试样弹性模量与温度的关系

    Figure  11.  Effect of temperature on elastic modulus

    图  12  高温后致密砂岩渗透率变化曲线

    Figure  12.  Diagram showing the permeability curves of the tight sandstones after exposing to high temperatures

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  • 收稿日期:  2019-11-01
  • 修回日期:  2020-04-21
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