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基于CT扫描的致密砂岩渗流特征及应力敏感性研究

杨峰 王昊 黄波 李晓倩 张超 肖春金 李静

杨峰, 王昊, 黄波, 等, 2019. 基于CT扫描的致密砂岩渗流特征及应力敏感性研究. 地质力学学报, 25 (4): 475-482. DOI: 10.12090/j.issn.1006-6616.2019.25.04.045
引用本文: 杨峰, 王昊, 黄波, 等, 2019. 基于CT扫描的致密砂岩渗流特征及应力敏感性研究. 地质力学学报, 25 (4): 475-482. DOI: 10.12090/j.issn.1006-6616.2019.25.04.045
YANG Feng, WANG Hao, HUANG Bo, et al., 2019. STUDY ON THE STRESS SENSITIVITY AND SEEPAGE CHARACTERISTICS OF TIGHT SANDSTONE BASED ON CT SCANNING. Journal of Geomechanics, 25 (4): 475-482. DOI: 10.12090/j.issn.1006-6616.2019.25.04.045
Citation: YANG Feng, WANG Hao, HUANG Bo, et al., 2019. STUDY ON THE STRESS SENSITIVITY AND SEEPAGE CHARACTERISTICS OF TIGHT SANDSTONE BASED ON CT SCANNING. Journal of Geomechanics, 25 (4): 475-482. DOI: 10.12090/j.issn.1006-6616.2019.25.04.045

基于CT扫描的致密砂岩渗流特征及应力敏感性研究

doi: 10.12090/j.issn.1006-6616.2019.25.04.045
基金项目: 

国家科技重大专项 2016ZX05002-002

国家自然科学基金 41272141

详细信息
    作者简介:

    杨峰(1982-), 男, 硕士、高级工程师, 主要从事岩石力学与地球化学研究。E-mail:yangfengupc@163.com

    通讯作者:

    李静(1967-), 女, 博士、教授、博士生导师, 地质力学及油气储层预测。E-mail:lijing0681@163.com

  • 中图分类号: TE319

STUDY ON THE STRESS SENSITIVITY AND SEEPAGE CHARACTERISTICS OF TIGHT SANDSTONE BASED ON CT SCANNING

  • 摘要: 认识低渗透储层的渗流特征对油气开采和储层改造具有重要意义。为此,研究利用微CT扫描技术对致密砂岩岩样进行扫描,据此建立了能够精细刻画岩样的微观模型,运用COMSOL模拟了流体在岩石孔隙中的渗流特征,研究了致密砂岩的渗流特征及应力敏感性。研究结果表明:流体入口和出口间压差固定时,岩石的渗透率保持不变,与入口出口压力的具体数值无关;不同方向的岩石模型计算渗透率处在同一数量级但有微小差异;在侧向压力作用下,渗流路径变窄,通过渗流路径的整体速度下降,渗透率下降,但在孔隙相对较大的地方,由于路径变窄,流体速度较未加压力前略有上升。

     

  • 图  1  岩石微观图像

    Figure  1.  Microimages of rocks

    图  2  XZ向模型速度

    Figure  2.  The velocity of the XZ model

    图  3  XZ向模型出口边界速度

    Figure  3.  Exit boundary velocity of the XZ model

    图  4  不同压差下的计算渗透率

    Figure  4.  The calculated permeabilities at different pressures

    图  5  50 MPa作用下XZ向模型应力图

    Figure  5.  The stress diagram of the XZ model under 50 MPa pressure

    图  6  不同侧向压力下的计算渗透率

    Figure  6.  The calculated permeabilities under different lateral pressures

    图  7  150°方向模型流速图像

    Figure  7.  The velocity images of the 150° direction model

    图  8  150°方向模型沿Y轴最大速度曲线

    Figure  8.  The maximum speed curves along the Y axis of the 150° direction model

    表  1  不同压力条件下XZ向模型的计算渗透率

    Table  1.   The calculated permeabilities of the XZ model under different pressures

    入口压力/Pa 出口压力/Pa 压力差/Pa 出口处平均速度/(m/s) 计算渗透率/mD
    100 0 100 4.63282×10-8 0.474400343
    200 100 100 4.63282×10-8 0.474400343
    300 200 100 4.63282×10-8 0.474400343
    100 0 100 4.63282×10-8 0.474400343
    1000 0 1000 4.63282×10-7 0.474400343
    1000000 0 1000000 4.61167×10-4 0.472235032
    5000000 0 5000000 2.29524×10-3 0.47006424
    10000000 0 10000000 4.56119×10-3 0.467065696
    15000000 0 15000000 6.79764×10-3 0.464052534
    20000000 0 20000000 9.01981×10-3 0.461814133
    下载: 导出CSV

    表  2  致密砂岩模型材料参数

    Table  2.   The material parameters of the tight sandstone model

    杨氏模量/GPa 泊松比 密度/(kg/m3)
    基质区域 27 0.17 2500
    孔隙区域 2.16 0 1000
    下载: 导出CSV

    表  3  各方向上模型在不同侧向压力作用下的计算渗透率

    Table  3.   The calculated permeabilities of each side upward model under different lateral pressures

    左边界压力/MPa 计算渗透率/mD
    XZ 30° 60° 90° 120° 150° 平均值
    0 0.47440 0.36246 0.32044 0.40315 0.54939 0.30818 0.40229
    10 0.47116 0.35908 0.31702 0.39926 0.54376 0.30558 0.39931
    20 0.46690 0.35356 0.31433 0.39519 0.54117 0.30255 0.39562
    30 0.46310 0.35052 0.31197 0.38923 0.53654 0.29966 0.39183
    40 0.45930 0.34601 0.30895 0.38485 0.53255 0.29684 0.38808
    50 0.45549 0.34206 0.30592 0.37891 0.52661 0.29506 0.38401
    下载: 导出CSV
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  • 收稿日期:  2018-09-14
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