COUNTING DEVICE FOR SELECTIVE GRIPPING PLUGS Russian patent published in 2017 - IPC E21B34/10 E21B43/12 

FIELD: mining.

SUBSTANCE: invention relates to drilling and completion of wells. Assembly with a counter for selective gripping plugs includes a controlled component. Counting component is installed with the controlled component, first, is located in the first position relative to the controlled component and moves relative to the controlled component. Locking element is used in a track formed between the controlled component and the counting component. Locking element is functionally made to ensure relative displacement between the controlled component and the locking element only in the first direction and between the counting component and the locking element only in the second direction. By at least one iteration of the counting component movement into the second position relative to the controlled component and back to the first position the locking element moves by certain pitches along the track. Controlled component is fixed with the counting component by the locking element, when the locking element comes to the end of the track.

EFFECT: technical result is improvement of efficiency of the counting device for selective gripping plugs.

23 cl, 9 dwg