Abstract
Most offshore blowouts occur during well drilling. Wells are generally classified as exploration and development. In Norway, exploration wells are classified into two groups: wildcats (wells drilled in an unproved area) and appraisal wells (wells drilled following a discovery to determine the extent of an oil field or gas field. In the UK, only wildcats are regarded as exploration wells, while appraisal wells form a separate category. This chapter classifies appraisal wells and wildcats as exploration wells. This is because blowout descriptions commonly do not specify whether the well was a wildcat or an appraisal. A development well is a well drilled within a proven area of an oil and gas reservoir to a depth of a stratigraphic horizon known to be productive. Drilling blowouts may occur at nearly all well depths. In some wells, very shallow gas pockets have been observed. In terms of well control, shallow gas blowouts are different from blowouts stemming from deeper zones of the well.
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