Single cycle dart operated circulation sub

Details Single cycle dart operated circulation sub Single cycle dart operated circulation sub

2011-05-03

2011-05-03

Bagnell, David J (Department: 3672)

Wells

Valves, closures or changeable restrictors

Operated by dropped element

C166S154000, C166S334400

Reexamination Certificate

active

07934559

ABSTRACT:
A circulating sub is run in with the circulating port closed. A dart blocks a central passage and moves two concentric pistons in tandem to open the circulation port while retaining the dart. The outer piston shoulders out in the circulation port open position. A second dart lands on the first and with applied pressure moves the inner piston relative to the shouldered outer piston to close the circulation port and only then discharge both darts. Subs can be used in tandem as long as higher located subs accept larger darts than lower subs and preferably the two darts for each sub are the same size. The ejected darts can be used to pressure actuate a downhole tool like a packer.

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