| 杨峰,钟安海,丁然,鲁明晶,李静*,吴玉鹏,刘伊帅.考虑油气运移的致密储层岩石流变损伤特性研究[J].实验力学,2023,38(6):741~750 |
| 考虑油气运移的致密储层岩石流变损伤特性研究 |
| Study on the influence of hydrocarbon migration of tight reservoir rocks on rheological properties and damage |
| 投稿时间：2023-06-27 修订日期：2023-08-25 |
| DOI：10.7520/1001-4888-23-134 |
| 中文关键词: 致密储层岩石 油气运移 CT扫描 流变特性 流变损伤 |
| 英文关键词:tight reservoir rocks hydrocarbon migration CT scanning rheological properties rheological damage |
| 基金项目:国家自然科学基金面上项目(42272153, 41972138) |
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| 中文摘要: |
| 为研究考虑油气运移致密储层岩石的流变损伤特性，本文通过CT扫描试验及数字图像技术精确表征致密储层岩石真实三维结构，据此建立真实岩心的三维模型，根据单轴压缩及流变试验获取模型细观参数，并基于PFC3D开展致密砂岩流变损伤数值模拟研究。研究结果表明：(1)致密砂岩细观模型的蠕变曲线随着孔隙压力的增大而逐渐上移，最终应变趋于稳定，稳定应变与孔隙压力呈正相关关系。(2)模型损伤与应变呈正相关关系，随着试样轴向应变的增长，损伤逐渐增加。(3)在相同荷载作用下，由于孔隙压力随孔隙中油气增加而增大，但增加幅度逐渐减小，模型损伤随之增加。此研究成果可为油田储层改造设计提供理论依据。 |
| 英文摘要: |
| In order to study the rheological damage characteristics of tight reservoir rocks considering oil and gas migration, CT scanning experiments and digital image technology are used to accurately characterize the true three-dimensional structure of dense reservoir rocks in this paper. A three-dimensional model of the real rock core is established, and the microscopic parameters of the model are obtained through uniaxial compression and rheological experiments. Based on PFC3D, numerical simulation research on rheological damage of tight sandstone is carried out. The research result indicates that: (1) The creep curve of the dense sandstone mesoscale model gradually shifts upwards with the increase of pore pressure, and the final strain tends to stabilize. The stable strain is positively correlated with pore pressure. (2) The model damage is positively correlated with strain, and the damage gradually increases with the increase of axial strain of the sample. (3) Under the same load, the pore pressure increases with the increase of oil and gas in the pores, but the increase gradually decreases, leading to an increase in model damage. This research achievement can provide a theoretical basis for the design of oilfield reservoir transformation. |
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