One-trip casing cutting and removal apparatus

Details One-trip casing cutting and removal apparatus One-trip casing cutting and removal apparatus

E - Fixed Constructions

21

B

E21B 29/00 (2006.01) E21B 31/16 (2006.01) E21B 31/20 (2006.01)

Patent

CA 2302926

A one-trip system for removing casing from a wellhead is described. The string includes a cutting device spaced at the required depth and a grappling device above it at the appropriate location. A swivel tool, such as a marine swivel, is used in conjunction with a seal-pulling assembly so that after cutting the casing, the seal assembly can be pulled without an additional trip into the well. The grappling device or spear can be hydraulically actuated to grab the casing for removal from the wellbore. The spear features a drop-in restrictor which allows sufficient flow during cutting operations with a mechanical cutter without actuating the spear, while at the same time allowing actuation of the spear by circulation after dropping in the restrictor after the casing section has been cut.

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