适宜高渗窜流通道的新型桥接颗粒调驱体系及封堵机理研究

Study of New Type Bridging Particles System for Water Channeling with High Permeability and Its Plugging Mechanism

安昊盈 侯吉瑞 程婷婷 赵凤兰

AN Haoying HOU Jirui CHENG Tingting ZHAO Fenglan

为改善传统颗粒型堵剂的不足，研究了一种由刚性内核及黏性覆膜组成的新型桥接颗粒的耐温耐盐性能、封堵性能和封堵机理。结果表明，桥接颗粒平均粒径为 117.23 μm，耐温耐盐性能较好，在 150℃、矿化度为 35g/L的条件下可稳定黏接；在注入速度 1.0 mL/min、颗粒注入量 0.05 PV、颗粒质量分数 5.0%和胍胶悬浮剂质量分数 0.2%的条件下，桥接颗粒的封堵效果最佳，高渗砂管模型水驱压力梯度由封堵前的约 3 kPa/m增至 41.82～141.70 kPa/m，渗透率由封堵前的 9～ 12 μm2降至 0.24 μm2左右，有效封堵率大于 97%。微观可视化实验结果表明，桥接颗粒调驱体系具有填充封堵、架桥-黏接封堵的功能。颗粒粒径大于孔喉直径时，颗粒发挥填充封堵功能；颗粒粒径为孔喉直径的 1/3～ 2/3时，颗粒发挥架桥-黏接封堵功能。该桥接颗粒可用于水驱油田开发中后期高渗窜流通道的封堵。图 4表 6参 17

In order to improve the shortcomings of traditional plugging particles，the performance of temperature resistance and salt tolerance，sealing characteristics and plugging mechanism of a new type bridging particles consisted of rigid kernel and softening film were studied. The results showed that the average diameter of bridging particle was 117.23 μm. The bridging particle had good temperature resistance and salt tolerance，which could adhere stably at 150℃ and 35 g/L salinity. The plugging effect of bridging particle was good on the optimum plugging condition of 1.0 mL/min injection rate，0.05 PV slug size，5.0% particle dosage and 0.2% guar gum suspending agent dosage. After plugging on optimum condition，the water flooding pressure gradient of high permeability sand pipe rose from about 3 to 41.82—141.70 kPa/m，the permeability decreased from 9—12 μm2 to about 0.24 μm2，and the effective plugging rate was above 97% . Microscopic visual model research revealed that bridging particle displacement system had plugging function with filling，bridging and adhesion. When the diameter of bridging particle was larger than that of pore throat，it displayed filling function during plugging，when that was 1/3—2/3 of pore throat diameter，it displayed bridging and adhesion function. The bridging particles could be used to block high permeability channel path in middle and late development stages of water flooding oilfield.