US 11,702,908 B2
All mechanical counter dart, system and method
Eugene Stolboushkin, Houston, TX (US)
Assigned to BAKER HUGHES OILFIELD OPERATIONS LLC, Houston, TX (US)
Filed by Eugene Stolboushkin, Houston, TX (US)
Filed on Apr. 8, 2021, as Appl. No. 17/225,348.
Prior Publication US 2022/0325606 A1, Oct. 13, 2022
Int. Cl. E21B 34/14 (2006.01)
CPC E21B 34/142 (2020.05) [E21B 2200/06 (2020.05)] 18 Claims
OG exemplary drawing
 
1. An all mechanical counter dart comprising:
a mandrel movable relative to a profile on a downhole actuation point;
a plurality of shoulder members disposed upon the mandrel and movable from a more downhole portion of the mandrel to a more uphole portion of the mandrel, individual ones of the plurality of shoulder members moving from an inactive unsupported position to an active supported position and back to an inactive unsupported position while traversing the mandrel in the same direction; and
an upset on the mandrel supporting the individual ones of the plurality of shoulder members when in the active position.