Описание

Много Cycle Circulating Клапан

The multicycle circulating Клапан with lock is a reclosable Клапан operated by tubing pressure and is used for spotting fluids and nitrogen. The Клапан responds to changes of flow direction rather than rate changes, making it insensitive to rate while circulating or reversing and enabling spotting nitrogen cushions and nitrified acids. It is also unaffected by the operation of annular-pressure-operated tools and is not limited in operation by available surface Насос horsepower.

How it works

The lock module retains the mandrel in the Открытый or Закрытый position. When the lock is Включённый, internal pressure testing can be conducted without using up cycles. The Клапан is also insensitive to pressure surges in the tubing or annulus, which is advantageous when Заблокированный in the Открытый (reverse) position to automatically fill the string while running in hole.

To unlock the tool, applied annulus pressure is used to rupture a preset disc, which disengages the lock. The Клапан can be cycled to reverse or circulate position and then reclosed.