普通稠油水淹层顶部剩余油水平井技术界限研究——以孤岛中二北Ng5为例

具有较大边底水的中等厚度的普通稠油油藏,长期以来利用直井开发,效果不佳。在高油价的有利条件下,针对该类油藏,提出了利用水平井挖潜,以孤岛中二北北部Ng5稠油区块为例,建立实际参数的概念模型,分不渗透隔层和无隔层两种类型,对水平井的开发方式、最小有效厚度、水平井垂向位置、排液量、井距及水平段长度进行了优化,给出了对应两种类型的水平井技术界限,现场实施取得了良好的开发效果。

Technology limit research on exploiting remaining oil using horizontal well on the top of water-out zone in heavy oil reservoirs

Effects of using vertical wells to exploit heavy oil reservoirs with middle thickness and large-scaled bottom water was not good,a new method of exploiting remaining oil using horizontal wells was proposed.Taking Zhong'erbei Ng5 block in Gudao Oilfield as an example,conceptual models(non-permeable interlayer model and non-interlayer model) with actual parameters were built,development method of horizontal well,its minimum effective thickness,vertical position,fluid delivery,well spacing,and length of horizontal part were optimized,and technology limit of this 2 models were studied.