Landing nipple

Landing nipple :

It is a completion component fabricated as a short section of heavy wall pipe. It is fitted in between two tubing joints.

Landing nipples are included in most completions at predetermined intervals to enable the installation of flow-control devices, such as plugs and chokes.

It has machined internal polished surface that provides a seal area and a locking profile to fit valves or plug inside tubing.

For locking profile, it has different arrangements. (See images)

Three basic types of landing nipple are commonly used in industry:

1) No-go nipples,

2) Selective-landing nipples and

3) Ported or safety-valve nipples.

No go landing nipple :

As name suggests, plugs or completion equipments can not completely go or pass through it.

It has restricted part in its design, which will not allow most of competition equipements through it.

so. this is nipple that incorporates at least one reduced diameter internal profile (that also provides a positive indication of seating by preventing the tool or device to be set from passing through the nipple).

In many completions, a no-go landing nipple (bottom) is preferred for the deepest nipple location (bottom of production tubing) providing a no-go barrier to protect against a tool string being run or dropped below the tubing string.

There are two types in No go nipples:

Top No go landing nipple and,

Bottom No go landing nipple.

Top No go landing nipple:

Has No go profile just above locking profile.

Care must be taken when designing the completion to ensure that there are no ID restrictions above the nipple to prevent passage of the lock assembly.

The “top no-go” nipple is generally run when a single nipple is required in the hole and the largest ID possible is required through the nipple profile.

Bottom no-go profile seating nipple:

The “bottom no-go” nipple has a no-go shoulder located in the bottom of the nipple.

Because its ID will not allow passage of any flow-control device through the nipple, the bottom no-go nipple is always run as the lowermost nipple in the completion.

Another benefit of having a no-go nipple in the completion is that any other slickline tools or tubing swabs that are lost in the tubing string should not fall to the bottom.

Selective nipple :

It is a type of landing nipple designed to be run in a series throughout the wellbore.

Any number of selective type nipples may be run in the completion string.

Two basic types of selective nipple system may be encountered, a nipple series in which the nipple design or profile determines the selectivity and one in which the running tool is used to find the target nipple.