Hydraulic cutting overshot

Details Hydraulic cutting overshot Hydraulic cutting overshot

1996-02-22

1997-11-25

Dang, Hoang C.

Wells

Means for perforating, weakening, bending or separating pipe...

With disparate below ground feature

166 553, 294 8634, E21B 3116

Patent

active

056901704

ABSTRACT:
An overshot cutter for suspension from coiled tubing that includes an elongate housing which includes a drive piston at the upper end with adjustable axial passage, an inner barrel there-below, and a cutter piston extending a collet cutter next below and finally a restrictor block; whereby the housing lower end is positioned down over a fish for hydraulic release of the drive piston to drive the inner barrel and cutter piston downward thereby to close the collet cutter within the restrictor block to cut the tubing below the fish.

REFERENCES:
patent: 1747513 (1930-02-01), Kammerdiner
patent: 1795322 (1931-03-01), Triplett
patent: 2167445 (1939-07-01), Brown
patent: 3031015 (1962-04-01), De Cordova
patent: 3174548 (1965-03-01), Webb
patent: 4099561 (1978-07-01), Nelson
patent: 4160478 (1979-07-01), Calhoun et al.
patent: 4662436 (1987-05-01), Parra et al.
patent: 4883118 (1989-11-01), Preston

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