M-Series Selective Lock
Description The M series lock is attached to subsurface control devices and anchors them in place in the tubing string. M series locks are designed to be landed in W selective landing nipples. The lock is used in applications involving differential pressures up to 5000 psi above or below the lock assembly. Each M series lock features an external running and fishing neck which enables use of the most common types of running and pulling tools. The packing assembly on each M series lock seals in the polished bore of the landing nipple. The M series lock is designed so that whenever pressure differential from above or below is experienced, all force will be supported by the locking dogs. Optional high temperature packing stacks for temperatures above 300°F are available for the M locks.
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Operation
When installing an M-series lock in the appropriate nipple, the lock and attached flow control device are attached to the appropriate W-series running tool and lowered into the tubing using standard wireline methods. The lock assembly is run below the desired landing nipple. The control device and running tool are then pulled back up through the nipple, tripping the running tool. The running tool and control device are then lowered back into the nipple. Downward jarring moves the expander tube downward, forcing the locking dogs out into the nipple locking recess, anchoring the assembly.
When removing the lock after pressure equalization of the flow control device, upward jarring with the appropriate J-series pulling tool unlocks the assembly and allows the lock to be pulled from the well.