CPC E21B 23/12 (2020.05) [E21B 7/061 (2013.01)] | 17 Claims |
1. A buoyant guide sub for use with a downhole oilfield conveyance, comprising:
a hollow tubular structure, the hollow tubular structure including one or more tubular walls; and
a housing coupled to and slidable relative to the hollow tubular structure, the hollow tubular structure and the housing operable to form a pressurized chamber, the hollow tubular structure and housing having a combined mass per unit volume less than a specific gravity of 2, wherein the housing includes a piercing device coupled thereto. the piercing device configured to pierce the hollow tubular structure when the housing slides relative to the hollow tubular structure.
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