Axial position-controlled operation toolstring and method
AssigneeArcher Oiltools AS
InventorsKurt Luis Krogsæter, Jan-Ove Fagna, Atle Løland, Bjørn Tore Torvestad
Life of this patent
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Abstract
An axial position-controlled operation toolstring for conducting an axial position-controlled operation in a well includes from below and up: a casing cutter tool including knives; a tag sub with dogs arranged for landing on a protrusion in said well; a pipe spear; and a drill pipe string. The knives of the casing cutter tool are spaced out a predetermined initial distance below the dogs of the tag sub. The dogs are arranged for being collapsible by weight loading against the protrusion. A method includes using the toolstring.
Claims25
An axial position-controlled operation toolstring for conducting an axial position-controlled operation for releasing a pipe component in a well, comprising from below and up:
- a casing cutter tool comprising knives;
- a tag sub with dogs arranged for landing on a protrusion in said well;
- a pipe spear;
- and
- a drill pipe string,
- wherein said knives of said casing cutter tool are spaced out a predetermined initial distance L below said dogs of said tag sub,
- wherein said pipe component is a polished bore receptacle, and said knives are arranged to cut slips and/or a slips lock of said polished bore receptacle thus freeing said polished bore receptacle, and
- wherein said dogs of said tag sub are arranged for being collapsible by weight loading against said protrusion,
- wherein said tag sub comprises a mandrel and said dogs of said tag sub are arranged in and protruding from slots in said mandrel, said dogs of said tag sub are arranged for collapsing into said slots when weight-loaded on said protrusion, and
- wherein said dogs of said tag sub are fixed in said mandrel with shear pins arranged for being sheared out by said weight loading against said protrusion so as for said dogs of said tag sub to slide upwardly and inwardly in said slots.
An axial position-controlled operation toolstring for conducting an axial position-controlled operation for releasing a pipe component in a well, comprising from below and up:
- a casing cutter tool comprising knives;
- a tag sub with dogs arranged for landing on a protrusion in said well;
- a pipe spear;
- and
- a drill pipe string,
- wherein said knives of said casing cutter tool are spaced out a predetermined initial distance L below said dogs of said tag sub, and
- wherein said tag sub comprises a mandrel provided with axial slots having a depth which increases from a shallow, lower end towards an upper, deeper end, and said dogs of said tag sub are secured in and protruding from said shallow, lower slot end, and said dogs are arranged for collapsing into said slots when weight-loaded on said protrusion.
Dependencies are inferred from the claim text.