页岩储层产量曲线分析

ANALYSES OF THE PRODUCTION CURVES FOR THE SHALE RESERVOIR

产量递减曲线分析在预测产量和提高储层采收率方面具有重要作用,其目的是确立产量与时间之间的关系,从而预测产能走势。Arps方程法和Arps方程改良后的产量曲线分析法目前在常规储层方面得到了广泛应用,但这些传统的方法并不适用于页岩储层之类的非常规储层。着重介绍了双曲线方法、Gentry方法、经验延伸法和Duong方法等非常规油气层产量曲线的分析方法。基于对几种产量曲线分析法进行概述的同时,借助Duong方法易比较和产量曲线易拟合的优势,论证了该方法对页岩储层生产预测的适用性;通过对瞬变流体和边界控制流体2种流态下产量曲线的分析计算,建立了经验方程式。最后,利用实际数据验证了Duong产量曲线分析方法的可行性。

Decline curve analysis has played a significant role in the prediction of the production performances and EOR of the reservoir, its purpose is to set up the relationship between the production and time, and furthermore to predict the trend of the productivity. Although at present the production curve analyzing methods such as Arps e- quation method and its modified one have been widely used in the conventional reservoir, the traditional methods are not suitable for the unconventional reservoir such shale reservoir. The hyperbolic, Gentry decline, empirical ex- tended, Duong methods and so on were emphasized introduced to analysis the unconventional reservoir decline curves. Based on the brief introduction of several production analyzing methods, with the help of the comparison and matching eases of Duong method, the adaptability of Duong method was discussed in the prediction of the shale reservoir production; by means of the analyses and calculation of the production curves under the two flow states of the transient liquids and boundary-dominating liquids, the empirical equation was built. Finally, with the help of the actual data, the feasibility of Duong decline curve analyzing method was verified.