US 11,993,993 B2
Deflector-less multilateral system using a buoyant guide sub
Morten Falnes, Stavanger (NO); Angus Mackay Barron, Aberdeenshire (GB); Mark C. Glaser, Spring, TX (US); and Michael Linley Fripp, Singapore (SG)
Assigned to Halliburton Energy Services, Inc., Houston, TX (US)
Filed by Halliburton Energy Services, Inc., Houston, TX (US)
Filed on Feb. 17, 2022, as Appl. No. 17/674,418.
Prior Publication US 2023/0258048 A1, Aug. 17, 2023
Int. Cl. E21B 23/12 (2006.01); E21B 7/06 (2006.01)
CPC E21B 23/12 (2020.05) [E21B 7/061 (2013.01)] 17 Claims
OG exemplary drawing
 
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.