自组装颗粒调驱体系注入方式优选实验研究

摘要

针对渤海油田储层渗透率高、水驱窜流严重的问题,采用新型自组装颗粒调驱体系,进行室内封堵以及驱油实验研究,并对颗粒注入方式进行对比.静态实验表明,自组装颗粒具有良好的耐温耐盐性能,耐温100 ℃,耐盐35000 mg/L;封堵实验表明,对于渗透率为10000×10 -3μm2左右的砂管模型,采用胍胶或聚合物溶液悬浮颗粒封堵后,砂管渗透率降至3000×10 -3μm2左右,砂管有效封堵率达70%;驱油实验表明,对于渗透率为20000× 10 -3μm2和4000×10-3μm2的并联砂管模型,在水驱采出程度为27.34% ~28.17% 的基础上,注入0.4 PV自组装颗粒调驱体系,其采出程度可提高28.57% ~38.76%,最终达55.91% ~66.80%,且采用胍胶或聚合物悬浮颗粒的注入方式效果较好.实验揭示了自组装颗粒的封堵机理主要是填充封堵、架桥封堵、黏接封堵.%In view of high permeability and serious water channeling in Bohai oilfield,a new type self-assembled particles profile control system was investigated.Laboratory plugging and oil displacement experiments were carried out with different injection modes.Static experiments showed that self-assembled particles had good properties of heat-resistance and salt-resistance,and it was applicable on the reservoir conditions of 65 ℃ and 35 000 mg/L.Plugging experiments showed that for sand-filled pipe which permeability was about 10 000×10-3μm2,after particles plugging with guanidine gum or polymer as suspension liquid,the permeability was dropped to about 3 000×10-3μm2and effective plugging rate was above 70%.Oil displacement experiments showed that for parallel sand-filled pipes which permeability was about 20 000×10-3,4 000×10 -3 μm2,when water-flooding recovery was 27.34% ~28.17%,the degree of extraction can be improved by 28.57% ~38.76%after injecting 0.4 PV self-assembled particles displacement system,and it can be up to 55.91% ~66.80% finally.It should be noted the injection mode with guanidine gum or polymer was better.Mechanism analysis revealed self-assembled particles displacement system had plugging functions such as filling,bridging and adhesion.