枯竭油气藏型储气库地层压力的计算方法

发布时间：2018-11-20 15:16

【摘要】：储层压力的动态变化是影响储气库注采能力的关键环节。为了研究储气库注采过程中地层压力随库容量的动态变化关系,结合生产数据和物质平衡原理,建立了3种评价储气库地层压力随库容量动态变化的快速计算方法,即生产数据拟合法、定容法及动态计算法。利用3种方法对储气库的地层压力随库容量的变化及地层压力在一个动态注采周期的变化进行计算,同时比较分析了定容法和动态计算法对储气库地层压力预测结果产生差异的原因,在此基础上对储气库注、采气量波动及注采周期对储气库地层压力的影响进行了敏感性分析。结果表明:3种方法都可以用于对储气库地层压力变化的动态预测,方法 1的准确性依赖于生产数据的获取及生产数据变化趋势分析;方法2适用于边水、油环的变化可以忽略的储气库地层压力预测;方法 3适用于对多种类型的储气库进行地层压力预测,但需要的地层参数相对较多。地层压力受日注采气量波动影响较小,受注采周期的影响较大。
[Abstract]:The dynamic change of reservoir pressure is the key to affect the injection and production capacity of gas storage. In order to study the dynamic relationship between formation pressure and reservoir capacity in the process of gas storage and production, combined with production data and material balance principle, three fast calculation methods for evaluating the dynamic variation of formation pressure with reservoir capacity are established. Namely production data fitting method, constant volume method and dynamic calculation method. The variation of formation pressure with reservoir capacity and the variation of formation pressure in a dynamic injection-production cycle are calculated by using three methods. At the same time, the reasons for the difference between constant volume method and dynamic calculation method on reservoir formation pressure are compared and analyzed. On this basis, the sensitivity analysis of reservoir injection, gas production fluctuation and the effect of injection period on reservoir formation pressure are carried out. The results show that the three methods can be used to predict the formation pressure change of gas reservoir. The accuracy of method 1 depends on the acquisition of production data and the analysis of the trend of production data change. Method 2 is suitable for the prediction of formation pressure of gas reservoir with marginal water and the change of oil ring can be neglected, and method 3 is suitable for the prediction of formation pressure of various types of gas storage reservoir, but the formation parameters need relatively more. The formation pressure is less affected by the fluctuation of daily injection and gas production rate, but by the injection-production cycle.
【作者单位】：中国石油大学(北京)城市油气输配技术北京市重点实验室;中油管道物资装备有限公司;
【基金】：国家自然科学基金青年基金资助项目“基于状态空间模型的天然气管网瞬态优化控制研究”,51504271
【分类号】：TE972

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