O-Series Subs for Pressure Equalization | Schlumberger

O-Series Subs

General-service crossover subs for pressure equalization applications

Rated to 5,000 psi [34.5 MPa]
Rated to 300 degF [149 degC]

Equalize pressure in subsurface controls for safe slickline retrieval

O and O-1 equalizing subs connect a C- or M-series lock to an equalizing sub to equalize differential pressures across slickline-retrievable subsurface controls before retrieving the controls from the tubing string.The difference between the O and O-1 subs is that the O-1 sub has internal threads to receive chokes. 

These subs are designed for use in sweet to moderately corrosive environments.

The O or O-1 sub acts as a crossover sub by converting the thread size of the C- or M-series lock to that of the equalizing sub or velocity-type safety valve. A pin in the upper end of the O-series subs holds the locking ratchets in place on the C- or M-series lock.

O-Series Sub
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