三元复合驱地层压裂支撑剂出砂程度及影响因素研究

Migration Regularity and Influence Factors of Proppant in Formation Fracture during Base/Surfactant/Polymer Flooding

郭 琦 牛丽伟 彭占刚 高立新 卢祥国 夏 欢

GUO Qi NIU Liwei PENG Zhangang GAO Lixin LU Xiangguo XIA Huan

为揭示三元复合驱生产井压裂过程中的裂缝出砂规律，以裂缝出砂率为评价指标，在人造岩心裂缝内开展了三元复合驱地层中支撑剂出砂程度及影响因素研究。结果表明，随裂缝闭合应力和填砂浓度增加、注入排量减小，石英砂出砂率降低；与水驱相比，强碱三元复合驱出砂率较高，在注入排量为200和800 mL/min时，三元体系的出砂率分别是污水的3.29倍和1.84倍；与水平缝相比，垂直缝出砂率较高；驱替液类型与裂缝形态对耐碱树脂砂的出砂率无影响，注入排量200~800 mL/min时的出砂率均为0；将石英砂与核桃壳或碳纤维混合可以降低出砂率，其中“石英砂+核桃壳”组合效果优于“石英砂+碳纤维”组合。在三元复合驱时，宜采用耐碱树脂砂或“石英砂+核桃壳”作为支撑剂。图2表4参16

In view of the sand production in fracturing process of production well with strong base/surfactant/polymer (ASP) flooding, taking the sand production rate as evaluation index, the sand production degree and influence factor of ASP flooding in artificial core were studied. The results showed that with increasing closure stress of fracture and concentration of sand filling, as well as decreasing injection rate, the sand production rate decreased. The sand production rate of ASP flooding was higher than that of water flooding. When the injection rate was 200 and 800 mL/min, the sand production rate of ASP was 3.29 times and 1.84 times of sewage’s, respectively. The sand production rate of vertically fracture was higher than that of horizontal fracture. The type of displacement fluid and fracture pattern had no influence on the sand production rate of alkali resistant resin sand, which was zero when injection rate was 200—800 mL/min. Mixing quartz sand with walnut shell or carbon fiber could reduce the sand production rate, and “quartz sand+walnut shell” had better effect than “quartz sand+carbon fiber”. During the process of ASP flooding, alkali resistant resin sand and “quartz sand+walnut shell” should be used to support agent.