| 刘晨,曲险峰,李静*,谢业统,张加太.致密砂岩蠕变试验及模型研究[J].实验力学,2020,35(6):1023~1029 |
| 致密砂岩蠕变试验及模型研究 |
| Creep experiment and model study of tight sandstone |
| 投稿时间：2019-09-14 修订日期：2019-10-28 |
| DOI：10.7520/1001-4888-19-166 |
| 中文关键词: 致密砂岩 分级加卸载 蠕变 本构模型 |
| 英文关键词:tight sandstone step load and unload creep constitutive model |
| 基金项目:国家自然科学基金面上项目(41972138);国家科技重大专项(2016ZX05002-002)资助 |
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| 中文摘要: |
| 致密砂岩储层岩石的蠕变特性是影响储层应力和油气渗流的重要因素之一。本文针对准噶尔盆地中部4区块的致密砂岩储层岩石进行了单轴加卸载蠕变试验，确定了其蠕变本构模型及参数。结果表明：致密砂岩在加载瞬间产生瞬时应变，在荷载的长时间作用下产生蠕变，在卸载后表现出明显的弹性后效，致密砂岩的蠕变具有黏、弹、塑性共存的性质；采用应力-应变等时曲线法对致密砂岩的长期强度进行研究，结果为41.38MPa，是单轴抗压强度的78%；引入非线性黏塑性元件与Cvisc模型串联，得到能描述致密砂岩蠕变特性的黏弹塑性模型，并进行模型参数辨识，得到的模型曲线与试验曲线吻合。本研究对致密油气的开采具有一定参考价值。 |
| 英文摘要: |
| The creep property of tight sandstone reservoir rock is one of the important factors affecting oil and gas seepage. In this work, the uniaxial loading and unloading creep tests are carried out on the rocks of tight sandstone reservoirs in 4 blocks in the central Junggar Basin, and the creep constitutive model and parameters of tight sandstone are determined. The results show that the instantaneous strain occurs at the moment of loading and the creep occurs during a long time under the action of loading. The elastic aftereffect is obvious after unloading. Creep behavior of tight sandstone is characterized by the coexistence of viscous, elastic and plastic properties. The stress-strain isochronous curve method is used to study the long-term strength of tight sandstone. The value of the strength is 41.38 MPa, which is 78% of the uniaxial compressive strength. The visco-elastic-plastic model describing the creep property of tight sandstone is obtained by connecting the non-linear viscoplastic element in series with the Cvisc model. The model parameters are identified, and the model curves are in good agreement with the test curves. This study has certain reference value for oil and gas exploitation of tight reservoir. |
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