| 摘要 |
A locking device and a method and apparatus are provided for emplacing the locking device within a selected one of a plurality of landing nipples positioned along a well conduit. Each nipple typically includes a seal bore portion having a bore diameter less than the conduit bore diameter and a recessed portion located above the seal bore having a diameter greater than the conduit bore diameter. The locking device includes a housing for retaining a plurality of circumferentially spaced expandable locking dogs. A camming sleeve is axially slidably within the housing and is utilized to support the dogs in one of three selected positions: a retracted position, a partially expanded no-go position, or a fully expanded locked position. The locking device is lowered down the well conduit on a running tool with the dogs in the retracted position until the running tool has passed through the seal bore of the nipple located directly above the selected landing nipple. The running tool is then pulled upwardly until a ratcheting portion of the running tool engages the seal bore portion of the nipple above the target nipple to set the locking dogs to the no-go position. The running tool and the locking device are then lowered further down the tubing until the locking dogs encounter the seal bore of the target landing nipple. At this time, the locking dogs are fully expanded to a locked position within the recessed portion of the target landing nipple. A retrieving tool also is provided.
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