Research on Stress Sensitivity of Fractured Carbonate Reservoirs Based on CT Technology
Research on Stress Sensitivity of Fractured Carbonate Reservoirs Based on CT Technology
复制标题
基于CT技术的碳酸盐岩裂缝性储层应力敏感性研究
DOI：
10.3390/en10111833
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发表时间：
2017-11
期刊：
影响因子：
3.2
通讯作者：
Ma Jingsheng
中科院分区：
文献类型：
--
作者：
Yang Yongfei;Liu Zhihui;Sun Zhixue;An Senyou;Zhang Wenjie;Liu Pengfei;Yao Jun;Ma Jingsheng
应力作用下裂缝孔径的变化一直被认为是裂缝性气藏应力敏感性的主要原因之一。然而，在加载和卸载循环过程中，断裂孔径形态的演变对流动特性的影响却知之甚少。本文报道了一项针对碳酸盐岩心塞的应力敏感性实验，在该实验中，计算机断层扫描（CT）技术应用于围压对裂缝孔径形态变化的可视化和定量评价。在选定的围压下建立裂缝模型，并在此基础上进行孔隙尺度流动模拟，以估算等效绝对渗透率。结果表明：围压在0 ~ 0.6 MPa范围内，随着围压的增大，裂缝孔径和当量渗透率减小的梯度大于0.6 MPa范围内；这意味着岩石样品在低有效应力下比在高有效应力下对应力更敏感。在加载路径上，有效围压与计算渗透率呈指数拟合。在卸载路径上，这种关系是部分可逆的，从CT图像上可以看出，这明显归因于断裂的塑性变形。
Fracture aperture change under stress has long been considered as one of primary causes of stress sensitivity of fractured gas reservoirs. However, little is known about the evolution of the morphology of fracture apertures on flow property in loading and unloading cycles. This paper reports a stress sensitivity experiment on carbonate core plugs in which Computed Tomography (CT) technology is applied to visualize and quantitatively evaluate morphological changes to the fracture aperture with respect to confining pressure. Fracture models were obtained at selected confining pressures on which pore-scale flow simulations were performed to estimate the equivalent absolute permeability. The results showed that with the increase of confining pressure from 0 to 0.6 MPa, the fracture aperture and equivalent permeability decreased at a greater gradient than their counterparts after 0.6 MPa. This meant that the rock sample is more stress-sensitive at low effective stress than at high effective stress. On the loading path, an exponential fitting was found to fit well between the effective confining pressure and the calculated permeability. On the unloading path, the relationship is found partially reversible, which can evidently be attributed to plastic deformation of the fracture as observed in CT images.
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DOI：
10.1016/0148-9062(78)90957-9
发表时间：
1978-01-01
影响因子：
7.2
作者：
GANGI, AF
通讯作者：
GANGI, AF
DOI：
10.1615/intjmultcompeng.2014010500
发表时间：
2015
影响因子：
1.4
作者：
Jun Yao;Rongrong Hu;Chenchen Wang;Yongfei Yang
通讯作者：
Jun Yao;Rongrong Hu;Chenchen Wang;Yongfei Yang
DOI：
10.2523/iptc-17846-ms
发表时间：
2014-12
期刊：
--
影响因子：
--
作者：
Jeff C. H. Li;Fahad Almudairis;Hong-quan Zhang
通讯作者：
Jeff C. H. Li;Fahad Almudairis;Hong-quan Zhang
应力敏感性对多孔介质微观孔隙结构和流体流动的影响
影响因子：
--
作者：
Yang Yongfei;Zhang Wenjie;Gao Ying;Wan Yujin;Su Yunhe;An Senyou;Sun Hai;Zhang Lei;Zhao Jianlin;Liu Lei;Liu Pengfei;Liu Zhihui;Li Aifen;Yao Jun
通讯作者：
Yao Jun
具有应力敏感性的多尺度离散裂缝网络中的流动
影响因子：
--
作者：
Liang Bin;Jiang Hanqiao;Li Junjian;Gong Changcheng;Jiang Ruyi;Pei Yanli;Wei Shiming
通讯作者：
Wei Shiming