Combination release mechanism for downhole well apparatus
AssigneeBaker International Corporation
InventorDarryl W. Cockrell
Life of this patent
Estimating the term…
Abstract
A well packer or other downhole tool is provided with a combination shear and rotational release mechanism comprising a release member having a set of internal threads selectively engageable with a predetermined number of external threads formed on an elongated tubular mandrel. The release member is keyed to the packer outer housing which in turn is cooperable with the slip and packing element assemblies. The mandrel may be selectively subjected to a predetermined upward pulling force to shear the threads on the release member or, alternatively, the mandrel may be rotated a predetermined number of turns to disengage the cooperating threads on the release member to effect release of the packer from its set position.
Claims18
Apparatus for insertion in a well conduit to form a seal between said conduit and a member disposed in said conduit, said apparatus comprising:
- an elongated tubular mandrel, and first and second spaced apart seal urging means disposed therearound;
- resilient seal means disposed around said mandrel between said seal urging means;
- at least one of said seal urging means being axially movable with respect to said mandrel and said other seal uring means to force said seal means radially outwardly into forcible engagement with said conduit;
- and
- means interconnecting said mandrel with said seal urging means, said interconnecting means including release means responsive to selective application of an axial force on said mandrel or rotation of said mandrel to effect relative movement of said mandrel to release said seal means from forcible engagement with said conduit, said release means being movable relative to said mandrel and said seal urging means to adjust the amount of axial force or rotation for effecting release of said seal means.
In a well packer including, an elongated tubular mandrel, a housing disposed around said mandrel and forming a fluid chamber, piston means disposed in said chamber and connected to an elongated sleeve, including a first downwardly facing annular shoulder, the improvement comprising:
- means disposed around said sleeve and forming a second upwardly facing annular shoulder, resilient seal means disposed between said shoulders and responsive to relative movement between said sleeve and said means forming said second annular shoulder for urging said seal means into engagement with a well conduit;
- lock means operable to lock said sleeve to prevent relative movement between said sleeve and said mandrel in a first direction;
- a release mechanism movable relative to said mandrel and said housing to adjust the amount of axial force or rotation for effecting release of said seal means interconnecting said mandrel and said housing and operable to release said mandrel for movement with respect to said sleeve in a second direction opposite to said first direction;
- and
- said release mechanism being operable in response to the selective application of an axial force on said mandrel or rotation of said mandrel to effect relative movement of said mandrel with respect to said housing to release said seal means sufficiently whereby said packer may be retrieved from said conduit.
Apparatus connected to an inner conduit inserted into an outer conduit for bridging the annulus between said inner and outer conduit, comprising:
- an elongated, generally tubular mandrel;
- first and second urging means, axially movable relatively towards each other;
- radially expandable bridging means disposed between said first and second urging means, said bridging means expanding radially outward into forcible engagement with said outer conduit as said first and second urging means move relatively towards each other;
- and
- means interconnecting said mandrel with one of said first and second urging means, said interconnecting means including combination release means responsive to selective application of an axial force on said mandrel or rotation of said mandrel to effect relative movement of said mandrel to release said bridging means for forcible engagement with said outer conduit, said release means being movable relative to said mandrel and said urging means to adjust the amount of axial force or rotation for effecting release of said bridging means.
Dependencies are inferred from the claim text.