Combining Knowledge and a Data Driven Method for Identifying the Gas Kick Type in a Fractured Formation

The main forms of gas kicks into the wellbore during drilling in fractured carbonate reservoirs are underbalanced pressure and gravity displacement. These two have different mechanisms entry well control measures, which require timely identification type kick when it occurs. A two-phase flow model with a wellbore-formation coupling was developed, based on rate models. variation characteristics bottomhole influx rate, free gas, pressure, change pit gain outlet an displacement kick, were compared analyzed. Combining dynamic time warping (DTW) wellbore-formation, coupled model, method type, DTW proposed. Following detection is performed by calculating distance between surface parameter series, obtained from simulation measured real time. field example results show that can identify real-time measurement parameters provide basis for taking targeted measures.