This paper reviews a recent shallow gas blowout while drilling with the semisubmersible rig DOO SUNG in 473 feet of water offshore Korea (See Figure 1).The objectives of this analysis are to:

FIRST: Substantiate the argument favoring drilling the conductor hole without a riser-if the rig is mobile.

SECOND: Describe procedures which will reduce the risk and cost of controlling the flow if a blowout occurs.

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