热固性自膨胀堵调体系的物理模拟实验研究与应用

Abstract

相关研究人员通过岩心流动物理模拟实验的方法，采用岩心驱替模型，通过监测实验过程中压力变化，来评价堵调体系在岩心中成胶后的封堵压差及水相封堵率，为现场应用提供参考。通过实验发现：当其它条件一定时，糠醇含量越高，封堵压差越大；成胶温度越高，封堵压差越小；堵前水相渗透率越大，固结后封堵压差越小。当其它条件一定时，封堵压差与岩心管的长度基本上是呈线性关系的，且岩心管越长，封堵压差越大。优化后的堵调体系在较低的浓度下，当处于高温时仍有很好的封堵强度，对不同渗透率的岩心均有良好封堵适应能力，其封堵率均在99.0%以上。在现场进行先导试验之后，堵调体系也取得了良好的降水增油效果。 Through the core flow experiment, the core displacement model was applied to monitor the pressure changes in the process of experiments to evaluate the block pressure difference and water plugging rate after the water shutoff system gel in cores, thus, it can provide a reference for field application. Found by experiment: the higher furfuryl alcohol content, the greater the block pressure difference; the higher the gelling temperature, the smaller the block pressure difference; the greater the aqueous phase permeability before the block of stratum, the smaller the block pressure difference after consolidation. When other conditions remain the same level, the block pressure difference and the length of the core tube is basically a linear relationship. The water shutoff system optimized in the lower concentration still has good sealing strength when exposed to high temperatures. As to the core of different permeability, it still has a good blocking ability and its blocking rate is 99.0% or higher.