Abstract
Abstract Operational problems associated with the occurence of shallow gas in offshore drilling led Statoil to initiate a massive research program. The program consisted of the following subprojects: Revised drilling procedures, shallow gas drainage, multistage cementing, gas tight cement, diverter systems, rig ventilation systems and emergency anchor release. Emphasis in this paper is placed on the experience from the West Vanguard blowout, and results from the subprojects on diverter systems, drilling procedures, quick anchor release and ventilation systems. Other papers (reference 1, 2) give information on development of gas tight cement, stage cementing and additional background on shallow gas drainage.
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