Drilling Industry Glossary
ECD
electrical stability
elevator
equivalent hole ID
excess - cement slurry
excess lime
excess - open hole
expandable casing
Excess - Open Hole
If a wellbore has the same diameter as the drilling bit, then it is a gauge hole. However, it is common for the hole to slowly enlarge with the passing of time, for example in clay formation. The open hole excess takes into the account of hole enlargement.
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