| 摘要 |
A retrievable well packer includes telescopingly interfitted housing and mandrel members movable one relative to the other to actuate the seal and anchor systems for setting the packer. A locking mechanism for holding the packer in the set position includes a cylindrical lock ring having axially spaced ratchet teeth, referred to in the art as wickers, on an outer circumferential surface engageable with cooperating internal axially spaced ratchet wickers formed on the housing member. The lock ring also includes axially spaced teeth on an inner circumferential surface engageable with cooperating teeth on a collapsible latch system engaged with the mandrel which may be collapsed radially inwardly to release the lock ring with respect to the mandrel to permit relative movement between the mandrel and the housing to release the packer elements from engagement with the casing. The collapsible latch system is held in position by a supportive sleeve slidably disposed in a bore formed in the mandrel and held in its retaining position by shear pins. The arrangement of the mandrel and housing and the latching and releasing mechanism is adapted for use in well tools of all types and may be set by fluid pressure applied to an expansible chamber, within the apparatus, by various wireline setting tools adapted to move the mandrel with respect to the housing, or mechanically, and can be retrieved simply by shifting the supporting sleeve to release the latch system and lifting the tool by the mandrel.
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