Tamtam: Was not sure what you were getting at. Start of drilling and spudding ARE the same as makes no practical difference. Where I work, spudding is when drilling starts once the conductor pipe is set. Sometimes people count spudding as when the conductor starts being drilled in or jetted in.
As far as ERHE goes, seems folk hope to know the day the drilling of the first well starts where ERHE has an interest and that cannot be predicted accurately far in advance. Some posters will fuss that no one knows, but that's the oilpatch!!! And on this board we are removed from operations.
If you meant to say "the start of drilling" is when the drillship goes on the Addax payroll after being released from the prevous well, then that is before spud date and that is the date that counts for the well costs.
OT, thanks for all your dedication and patience in posting and moderating, often in the midst of abrasive ignorance.
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