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Gas influx from reservoir into the wellbore during drilling, tripping, or other operations, is a hazard. In the early stages, the influx may be nearly undetectable, but the kick can rapidly change from a seemingly steady condition to one of extremely high flow rate. The resulting uncontrolled release of large amounts of gas on the drilling rig can ignite and explode; causing loss of life, loss of asset, and contamination of environment. A kick perturbs the system; analysis of the resulting transient flow could lead to significant improvement in timely detection of a kick. Timely detection is essential to avoid blowouts. Early detection also allows better characterization of potential blowout, allowing improved response and mitigation efforts. Early gas-kick prediction and analysis through dynamic multiphase flow can lead to significant progress in detection and controlling of High Pressure High Temperature (HPHT) drilling of deep …