关于储集层敏感性评价的若干问题

发布时间：2018-11-18 07:08

【摘要】：储集层物性随条件变化,有关参数也发生变化,即出现所谓的敏感现象,并影响油气生产,需要认真评价。现有的评价方法和评价标准都存在一些问题,客观性不足。根据研究,储集层敏感程度可以用渗透率损失率来表示,评价标准可以由0.3和0.7改为0.1和0.3.水敏属于盐敏的极端情况,盐敏评价包括了水敏评价;致密储集层的应力敏感性极弱,对生产影响极小;疏松储集层的应力敏感有利于驱油,实验室很难评价;速敏是一个伪概念,属于实验假象,不仅不能反映储集层敏感的本质,还可能误导生产实践;储集层渗透率对注入水中的固相颗粒大小非常敏感,需要认真评价。因此,储集层的常规五敏评价可以改为四敏评价,即盐敏、酸敏、碱敏和粒度敏评价。
[Abstract]:The physical properties of reservoir change with the condition, and the related parameters also change, that is, the so-called sensitive phenomenon appears and affects the production of oil and gas, so it needs to be evaluated carefully. There are some problems in the existing evaluation methods and evaluation criteria, but the objectivity is insufficient. According to the study, the reservoir sensitivity can be expressed by permeability loss rate, and the evaluation criteria can be changed from 0.3 and 0.7 to 0.1 and 0.3. Water sensitivity belongs to the extreme case of salt sensitivity, salt sensitivity evaluation includes water sensitivity evaluation, the stress sensitivity of dense reservoir is very weak, the effect on production is very small, the stress sensitivity of loose reservoir is favorable to oil displacement, and it is difficult to evaluate in laboratory. Velocity sensitivity is a pseudo-concept, which belongs to experimental illusion, not only can not reflect the nature of reservoir sensitivity, but also may mislead production practice. Reservoir permeability is very sensitive to the size of solid particles in injected water and needs to be seriously evaluated. Therefore, the conventional five-sensitivity evaluation of reservoir can be changed into four sensitivities, namely, salt sensitivity, acid sensitivity, alkali sensitivity and granularity sensitivity evaluation.
【作者单位】：西南石油大学石油与天然气工程学院;中国石油大庆油田有限责任公司勘探开发研究院;
【基金】：国家科技重大专项(2016ZX05054)
【分类号】：TE31

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