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To locate and lock a variety of subsurface controls in the desired corresponding nipple profiles.
The X lock mandrels have internal fishing necks, their components are:
1. Fish Neck
2. Expander Sleeve
3. Key Retainer
5. Key Spring
6. Packing Mandrel
7. Male Backup Ring
8. Female Backup Ring
The X lock mandrels with the flow control components are designed for the X seating nipples installed in standard weight tubing. These lock mandrels similar in design are selective, this is made possible by their running tools. The lock mandrels maybe installed in any one of multiple seating nipples installed in the tubing string of comparable size.
Once the desired nipple has been located in the tubing string 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.
The X lock mandrels are ran selective, or can be ran in the non selective position when setting in the upper X profile in the tubing completion string.
Both the running positions are built into the running tool which has a set of locating dogs to selectively run and set the lock mandrels in the lower nipples in the string.
The running tool is changed to a non selective position once the desired selective nipple has been located. This is done by lowering the running tool with the lock mandrel through the nipple profile and then pulling back up through. The X running tool procedures are explained in the X running
tool operation in the running tools section.
Be sure the key springs are of the right tension and form so as to hold the keys fully loaded for running in a controlled position and held tight to the packing mandrel when the lock mandrel is ran selective. This prevents the keys from hanging up when passing through upper nipples. Ensure the ratchet rings on the expander sleeve and inner keys are not excessively worn.