Schlumberger

Locks

Overview Library

Anchor and seal a pressure or flow control device in tubing strings

Locks are available for a range of applications.

Without landing nipples

The A-slip lock is a slickline-retrievable anchor with cup-type seals that can be set at any depth in the tubing. It is used to lock and seal an attached flow control device in tubing strings installed without landing nipples. Flowing the well energizes the seals against the tubing wall.

The Z-5 collar lock is used as a tubing stop in wells that have tubing collar recesses to set the lock (i.e., API coupled tubing joints). A landing nipple is not required. The lock has a straight-through bore and cannot be unset by high-velocity liquid or gas. It is ideal for use in packoff installations and as an anchor for the bottomhole bumper spring in plunger lift installations. A packing section can be attached to the lower end of the lock, together with any standard subsurface control.

With landing nipples

Some locks are installed in landing nipples to seal and anchor subsurface flow or pressure control devices (e.g., standing valves, surface-controlled subsurface safety valves) in the tubing string. Various temperature and differential pressure ratings are available.

Shock absorber

When a lock is to be installed in a landing nipple, a shock absorber can be connected between the lock and the pressure or temperature gauge suspended from it. The shock absorber prevents damage to the gauge by isolating it from the jarring action produced when setting and pulling the lock.

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