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首页> 外文期刊>Metalurgia >EXPERIMENT STUDY ON STRESS SENSITIVITY OF TIGHT RESERVOIR UNDER RESERVOIR CONDITIONS
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EXPERIMENT STUDY ON STRESS SENSITIVITY OF TIGHT RESERVOIR UNDER RESERVOIR CONDITIONS

机译：储层条件下致密储层应力敏感性试验研究

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摘要

In view of the present four problems in reservoir stress sensitivity study, this paper makes a specific experiment to evaluate the stress sensitivity of tight reservoir. In the experiment, the confining pressure is constant while the flow pressure can be changed. The main apparatuses of the experiment are put in an incubator. The experiment uses full diameter cores and oil of the real reservoir and adopts the oil-measured permeability under the original stress state as a datum point. The results indicate that the stress sensitivity of tight reservoir is strong, and when the effective stress of the reservoir rock decreases again, the oil-measured permeability of most cores almost do not recover. This is mainly caused by the following three reasons: 1) the fine granularity ofdetrital components of tight reservoir;;2) the high content of clay interstitial material;;3) the existence of minimal throat radius for the liquids passing through. Based on this, the paper calculates the impact of stress sensitivity on productivity using a productivity evaluation model of single-phase stable flow. The result shows that the smaller the oil-measured permeability and the bottom-hole flowing pressure, the bigger the impact of stress sensitivity on productivity is. Therefore, it is proper to prefer the "sweet spots" reservoir and maintain a relatively stable reservoir pressure when developing the tight reservoir.
机译：针对目前储层应力敏感性研究中存在的四个问题，本文进行了具体实验，评价致密储层的应力敏感性。在实验中，围压是恒定的，而流动压力可以改变。实验的主要设备放在培养箱中。该实验使用全直径岩心和实际油藏的油，并以原始应力状态下的测油渗透率作为基准点。结果表明，致密储层的应力敏感性强，当储层岩石的有效应力再次降低时，大多数岩心的测油渗透率几乎无法恢复。这主要是由于以下三个原因造成的：1）致密储层碎屑成分的细粒度; 2）粘土填隙材料的含量高; 3）通过的液体存在最小的喉径。基于此，本文使用单相稳定流生产率评估模型来计算应力敏感性对生产率的影响。结果表明，测油渗透率和井底流动压力越小，应力敏感性对生产率的影响越大。因此，在开发致密油藏时，最好选择“最佳点”油藏并保持相对稳定的油藏压力。

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