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喇萨杏油田进入高含水后期开发以后,部分区块层系注采系统不适应的矛盾越来越严重。针对高含水后期注采系统的主要特点,研究建立了高含水后期注采系统适应性评价方法,对喇萨杏油田高含水后期注采系统的适应性进行了评价,研究确定了注采系统调整的主要方式,对典型区块的调整效果进行了分析。喇萨杏油田高含水后期注采系统调整可以归结为反九点面积井网、四点法面积井网及注采井网不完善等3种类型的调整模式。高含水后期进行注采系统调整可以取得较好的调整效果,提高水驱采收率0.9个百分点左右。成果对油田高含水后期注采系统调整工作具有重要的指导作用。
After the development of the Lazard apricot oilfield in the late stage of high water cut, the contradiction between the injection and production systems of some block-level systems is becoming more and more serious. In view of the main features of late injection and production system of high water cut, the adaptive evaluation method of injection and production system in later stage of high water cut was established to evaluate the adaptability of injection and production system in the late stage of high water cut in Lazard apricot oil field. The main way, the adjustment of the typical block effect were analyzed. The adjustment of injection and production system in the later stage of high water cut in LaSaxing Oilfield can be attributed to the adjustment mode of 3 types of wells, such as the well pattern with anti-9 o’clock area, the well pattern with 4 o’clock method and imperfect injection well pattern. In the later period of high water cut, the adjustment of injection and production system can achieve better adjustment effect and increase the water recovery by 0.9%. The results have an important guiding role in the adjustment of injection and production systems in the late stage of high water cut in oilfields.