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To offer a positive locating sequence for sub surface controls in selective F nipple profiles.
The W top no-go lock assemblies have an external fishing neck and consist of:
1. Lock Mandrel
2. Two Lock Dogs
3. Lock Springs
The W lock assemblies have a larger OD dimension near the top of the lock mandrel which no-gos on top of the nipple profile sealing bore preventing downward movement when locked in the nipple profile. The two locks are fitted and pinned in the body of the lock mandrel facing up to prevent upward movement of the lock assembly when locked into the nipple profile.
The W lock assemblies are ran in the F profile seating nipples having a seal bore dimension smaller than the lock assembly no-go OD dimension. Ran with a C-1 running tool. Pulled with a JUC or JDC pulling tool and the model B probe to disengage the locks.
The W lock assembly with subsurface control is appropriately pinned to theC-1 running tool, no shanks or locator rings are required for C-1 running tool.
The C-1 running tool with the W lock assembly and the subsurface control is attached to the tool string and lowered to the nipple profile, taking the tool string weighs above nipple depth.
Downward jarring sets the W lock assembly in the seating nipple profile. Upward strain ensures the lock assembly is set in the seating nipple profile, upward jarring now shears the pins in the C-1 running tool. The W lock assembly is ran with the up facing locks trailing.
Be sure the W lock assembly no-go OD is larger than the seal bore size of the desired seating nipple it is to be set in. This prevents the loss of the lock assembly and accessory out of the tubing string into the casing, should there be no more nipples with a small enough ID for the W lock no-go to locate in.