초록 ▼

An apparatus for pulling objects from a well is described. The apparatus may comprise an elongated housing having an internal chamber. The housing will be connected to a work string such as wireline or coiled tubing. A skirt is attached to the housing, with the skirt having an inner portion. The ski

An apparatus for pulling objects from a well is described. The apparatus may comprise an elongated housing having an internal chamber. The housing will be connected to a work string such as wireline or coiled tubing. A skirt is attached to the housing, with the skirt having an inner portion. The skirt will contain a first window and a second window, with the first window having a first load shoulder and the second window having a second load shoulder. The apparatus further contains a mandrel disposed within the inner portion of the skirt, and two dog members disposed about the mandrel. The dog member have a first surface that cooperates with the first load shoulder and a second surface that cooperates with the second load shoulder. The dog members distributes a pull force which is exerted on the apparatus to the first and second load shoulder so that the effective tensional strength of the skirt is enhanced. The mandrel will have a second end containing an angled shoulder. The dog member will contain an angled leg that is configured to cooperate with the angled shoulder of the mandrel. The apparatus comprises a member for selectively disconnecting the skirt to the mandrel so that the mandrel is slidably received within the inner chamber of the housing which allows for the apparatus to be retrieved from the well. A method of releasing a device that is attached to an object within a well bore is also disclosed.

대표청구항 ▼

[I claim:] [1.]a tubular housing having an outer portion and inner portion;a skirt attached to said tubular housing, said skirt having an inner bore and wherein said skirt contains a first window and a second window, said first window having a first shoulder thereon and said second window having a s

[I claim:] [1.]a tubular housing having an outer portion and inner portion;a skirt attached to said tubular housing, said skirt having an inner bore and wherein said skirt contains a first window and a second window, said first window having a first shoulder thereon and said second window having a second shoulder thereon;a core being disposed within said inner bore of said skirt, said core being connected to said skirt with a shear pin and wherein said core has a first end and a second end, and wherein said second end contains an angled shoulder;a dog member disposed about said core, said dog member having a first end that cooperates with said first shoulder of said first window and a second end that cooperates with said second shoulder of said second window wherein said dog member contains an angled leg that is configured to cooperate with said angled shoulder of said core;a core nut attached to said first end of said core, said core nut cooperating with said inner portion of said tubular housing to form a first spring chamber;a first spring disposed within said first spring chamber, said first spring biasing a first end of said core nut in an upward direction so that as said shear pin is sheared, said core is slidably received within said inner portion of said tubular housing.