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Oilfield Glossary
Oilfield Glossary
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Tools

lock-up

1. n. [Well Workover and Intervention]
A condition that may occur when a coiled tubing string is run into a horizontal or highly deviated wellbore. Lock-up occurs when the frictional force encountered by the string running on the wellbore tubular reaches a critical point. Although more tubing may be injected into the wellbore, the end of the tool string cannot be moved farther into the wellbore.