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To selectively lock subsurface controls in compatible F seating nipples.
The S lock assemblies have an external fishing neck and consist of:
1. Lock Mandrel
2. Four Lock Dogs
3. Lock Springs
The locks are fitted and pinned in the mandrel with two locks facing up to prevent upward movement and two locks facing down to prevent downward movement once the lock assembly is locked into place in the F seating nipple. The S lock assemblies are made selective by two components, they are graduated nipple seal bore sizes and the running tool locator ring sizes. The S lock assembly is ran with the C-1 running tool complete with locatorring and model A shank.
The shank is required if the lock assembly is not equipped with a removable equalizing mandrel in the subsurface control.
The model A shank when threaded into the running tool and pinned to the S lock assembly retracts the down facing locks for running in the well. Pulled with a JUC or JDC pulling tool and model A swivel probe to unlock the up facing locks.
The S lock assembly with the subsurface control is pinned to the C-1 running tool with appropriate locator ring. The C-1 is attached to the tool string and lowered in the well to just above the desired seating nipple, the tool
string weight is now taken. The lock assembly is now set in the seating nipple profile with moderate downward jarring, an upward strain will indicate the lock assembly with the sub surface control is locked in the nipple. Upward jarring will shear the running tool pins, releasing the C-1 running tool from the lock assembly. Once the shearing sequence is done the S lock assembly will be retained in the seating nipple profile with the four locks. When running the up facing locks are trailing and during pulling the down facing locks are trailing.
Choosing the correct locator ring for the C-1 running tool is important to eliminate the possibilities of the lock assembly and the subsurface control being located and set in the wrong profile in the tubing string.