Oilfield Glossary
Oilfield Glossary
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opening bomb

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1. n. [Well Completions]
A device used in stage cementing to open the stage collar or diverting valve through which the second or subsequent cement stage is placed. The opening bomb is dropped down the casing string to land in a seat within the stage collar. Applying pump pressure then activates a sliding collar that opens access ports, enabling circulation across the upper casing interval.