【摘要】 针对水力压裂现场关注的裂缝进液问题，搭建了全尺寸“压裂管柱+井筒+裂缝进液通道”DAS监测实验装置，开展了不同流量、黏度、砂比情况下的裂缝进液模拟实验，在实验参数范围内确定出裂缝进液的分布式光纤声波传感响应特征频段在50～200 Hz之间，并建立了裂缝进液量、压裂液黏度、孔眼尺寸以及声波频带能量之间的关系模型，现场压裂数据验证了回归模型的准确性。研究结果可为现场实时压裂指挥提供决策依据。更多还原

【Abstract】 Aiming at the liquid inflow caused by the hydrofracture on the site, a full-scale “fracturing string + wellbore + fracture fluid inflow channel” DAS monitoring and experimental device was established to simulate the fracture fluid inflow at various flow rates, viscosities and sand ratios. Within the range of experimental parameters, the distributed optical fiber acoustic wave sensing response characteristic’s frequency band of fracture fluid inflow which staying at 50 to 200 Hz was determined and a relationship model among fracture fluid intake volume, fracturing fluid viscosity, hole size and acoustic wave frequency band energy was established. The on-site fracturing data verified the accuracy of the regression model. The research results provide a decision-making basis for the on-site real-time fracturing.更多还原