欢17块底水油藏水锥起降规律影响因素研究

为改善底水油藏开发效果、降低油藏开发中底水锥进现象带来的影响,对影响底水锥进现象各因素进行了详细分析。结合欢17块大凌河边底水油藏地质特征及开发特点,利用油藏工程分析方法及油藏数值模拟技术,总结出水锥起降规律。实验结果表明:隔夹层距离射孔段越远、平面展布面积越小,底水锥进现象越明显;油水黏度比、垂向水平渗透率之比、井距与水锥下降速度呈正变关系;在压制底水锥进过程中,单井日产液量越高,水锥下降速度越快;水锥下降高度变化主要发生在前4 a,建议矿场上最佳关井压锥时间为4 a。

Investigation on influencing factors on water coning pattern in the bottom water reservoir of the Huan17 block

Influencing factors on bottom water coning are meticulously analyzed for the Dalinghe bottom/edge water reservoir in the Huan17 block. The water coning pattern has been generalized by analyzing reservoir geology and development features and using reservoir engineering and reservoir simulation methods. Experimental results indicate that the farther the distance between interbed and perforation is,the smaller the areal distribution of interbed is,the more prominent the bottom water coning will be;oil/water viscosity ratio,vertical/horizontal permeability ratio and well spacing are all in positive correlation to the decline rate of water cones,in the process of bottom water coning control,the higher the daily mass production of single well is,the faster the decline rate of water cone will be. The change in water cone height mainly takes place in the first four years,so it is suggested to shut in wells and control water coning for four years.