Oilfield Glossary
Oilfield Glossary
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Tools

washover

1. n. [Well Workover and Intervention]
A type of milling operation in which the outer surfaces of a plug or similar fish are milled with a circular hollow mill. By including wash pipe in the tool string, the mill face can reach over the body of the fish until it can be pushed to bottom, or until the slips or retaining device can be milled out and the fish retrieved.