A number of gas kick experiments have been performed in a 2000 m long, 60° inclined research well. During the experiments a several of parameters were varied, such as mud density, mud type, gas concentration, and control rate of the kick. The well was heavily instrumented during the experiments, both downhole and surface.

The gas distribution at start of the kick has been computed, and compared to the gas distribution out of the well which was calculated based on, measurements of the mixture density through the choke line, choke pressure and pit gain. This was done for the majority of the 24 kicks which were performed. The effect of mud density and solubility on the return distribution has been analysed. Effects of operational procedures during the kicks have been analysed as well (circulation rates and duration of close-in).

The work shows that the return gas rate and gas distribution depends on the following variable; the initial gas distribution, mud type (OBM or WBM), and operational history of the kick.

Optimal operational control procedures which will create the most favourable return gas distribution are recommended.

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