摘要
目前,关于高含水油田矢量注采的文献大多以定性或策略性结论为主,缺乏定量研究,在实际应用中有一定的局限性。通过引用等饱和度前缘界面来定义体积波及系数,利用数值模拟技术,建立了一套体积波及系数的评价方法。基于该方法进行了反九点井网转五点井网条件下的矢量注采波及系数评价,并绘制相应图版,以指导井组矢量注采优化。研究表明,对于平面均质储层,水平井变井网后"强注强采"模式开发效果更佳:新加密水平采油井高液量生产,最佳液量600 m3/d;边角井转注后维持高注采比,最优注采比为角井1.2~1.4,边井1.0~1.2;原水井降低注采比,最优注采比0.5~0.75。Q油田先导试验井组表明,矢量注采优化调整能够改善水驱波及,控水稳油,提高水驱采收率,对于经历类似井网调整的海上油田具有很好的推广应用价值。
At present,the document about vector injection-production in high Water cut Oilfield mostly provides a qualitative or strategic conclusion,which lacks quantitative research and has certain limitations in practical application. In this paper,an evaluation method of volumetric sweep efficiency is established by using numerical simulation technique after isosaturation front surface is introduced to define volumetric sweep efficiency. Based on the method,a vector injection-production sweep efficiency evaluation is conducted and relation charts between volumetric sweep efficiency and injection-production ratio are mapped out which offer a guide to injection and production. Research shows,for homogeneous reservoir,intensive injection and production provides a better development effect. The infilling horizontal well should produce on a high liquid level（ 600 m3/d）,the original water well should inject at a low injectionproduction ratio（ 0. 5 ~ 0. 75） and the new inverted water well should inject at a high injection-production ratio（ corner well 1. 2 ~ 1. 4,edge well 1. 0 ~ 1. 2）. The results of pilot well group in Oilfield Q indicate thatvector injection-production could improve water flooding sweep efficiency and enhance the oil recovery,which has a great value of application and dissemination for those similar offshore oilfields after well pattern adjustment.
出处
《天然气与石油》
2017年第6期59-65,共7页
Natural Gas and Oil
基金
国家科技重大专项"海上油田丛式井网整体加密及综合调整油藏工程技术应用研究"(2011 ZX 05024-002-007)
关键词
体积波及系数
反九点井网
五点井网
矢量注采
提高采收率
Volumetric sweep efficiency
Inverted nine spot pattern
Five spot pattern
Vector injection-production
Enhancing oil recovery
