聚驱井区加密后聚水同驱干扰机理与控制

针对渤海W油田聚驱过程中因油井转注和井网加密引起的水聚干扰问题,首先基于目标油田特征建立了典型聚合物驱井组油藏模型,精细研究了聚合物驱中后期因井网加密引起的水聚干扰情况下的产油、含水率、波及面积指标动态,进而剖析了其对驱油效果影响机理;同时测试了通过适当降低水聚干扰区注水速度,注水/注聚井轮换交替注水/注聚与加密井后期封堵高渗层3种方法改善水聚干扰下驱油效果的方法;最后在目标油田进行了应用评估。研究成果对于渤海油田聚合物驱方案的顺利实施、调整完善以及增油上产效果的保障具有借鉴意义。

Study of the water polymer interaction and control methods after well pattern infilling in polymer flooding region

The water and polymer interaction problem in W field in was obvious due to the water injectors converted from producers and new infilling ones in previous polymer injection well pattern. Firstly, on the base of a typical 3-injector 3-producer post-infilling polymer flooding reservoir model from W oil field, the interaction mechanism were investigated according to those important production indexes including sweeping efficiency, water cut, and oil rate. Secondly, the adjustment and improvement methods including water/polymer injection rate ratio, shift or alternation of water/polymer injection in injectors, and shutting of high-permeability layers in injectors were designed and tested to resolve above problems. Finally,the improvement methods was tested in the full-field reservoir model of W field. This study provides critical insights for understanding the polymer water interaction mechanism and optimization strategies for offshore polymer flooding projects in Bohai Bay.