초록 ▼

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 spa

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.

대표청구항 ▼

A retrievable apparatus adapted to be inserted in a first subterranean conduit means such as a well to provide a seal in the annulus formed between the first conduit means and a second conduit means disposed therein comprising: tubular mandrel means adaptable to be sealingly associated with the seco

A retrievable apparatus adapted to be inserted in a first subterranean conduit means such as a well to provide a seal in the annulus formed between the first conduit means and a second conduit means disposed therein comprising: tubular mandrel means adaptable to be sealingly associated with the second conduit means having first seal urging means at one end of the mandrel means; housing means disposed around the end of the mandrel means opposite the first seal urging means and including second seal urging means, the housing means being moveable relative to the mandrel means whereby the first and second seal urging means will apply in axial compression force to annular sealing means disposed therebetween; annular sealing means disposed between the first and second seal urging means adapted to be urged outwardly into sealing engagement with the first conduit means in response to axial compression by the urging means, and to contract when such axial compression is removed; a selectively releasable latching system cooperatively coupled between the housing and the end of the mandrel means opposite the first urging means for permitting movement of the housing relative to the mandrel means to move the first seal urging means toward the second seal urging means and thereby apply a compressive force to the sealing means therebetween and then holding the relative positions of the mandrel means and housing means until selectively released to remove the compressive force on the sealing means and permit retrieval of the apparatus, the latching system including: ratchet means for permitting relative movement between the housing and the ratchet means in a direction to apply a compressive force to the sealing means and hold the compressive force on the sealing means, and selectively releasable coupling means coupling the ratchet means to the mandrel means, the coupling means including sleeve means disposed within the mandrel means and axially shiftable from a first position to a second position to decouple the ratchet means from the mandrel means and thereby release the compressive force held on the sealing means.