John Dewar Shell Philippines Exploration BV Manila Douglas Halkett Forasol/Foramer Manila Hydrocarbon containment procedures and innovative mud loss cures in a deepwater drilling program minimized the problems from severe lost circulation and the possible subsequent formation of hydrates from gas influx. In the deepwater (8301,000 m) drilling program offshore Philippines, reefal limestones were encountered in which total mud losses could be expected because of the presence of large fractures. The danger was that a sudden drop in hydrostatic head (resulting from the losses) could allow any natural gas to enter the well bore quickly. ...

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