XN Lock is the no-go version of X lock. The keys are composed of an angled shoulder which is designed to fit in bore restriction of a nipple which has a bottom nogo that is smaller than the seal bore. This device is designed to be used in single installations or to be used as a bottom nipple in a series of X nipples.
The “XN” lock mandrels with the flow control components are designed for the “XN” seating nipples installed in standard weight tubing. These lock mandrels similar in design are non – selective. Once landed in the seating nipple these mandrels are mechanically locked. This is done by driving the expander sleeve behind the keys, holding the mandrel in a locked position.
Running tool required is “X” and pulling tool required is “GS” or “GR”.
Ensure the ratchet rings on the expander sleeve and inner keys are not excessively worn.