Method of locating wellbore casing collars using dual-purpose ma

Details Method of locating wellbore casing collars using dual-purpose ma Method of locating wellbore casing collars using dual-purpose ma

1998-08-15

2000-03-07

Bagnell, David

Wells

Processes

Perforating, weakening, bending or separating pipe at an...

166 665, 1662552, 166 66, 175 451, 175 452, E21B 2902, E21B 4709, E21B 43119

Patent

active

060327391

ABSTRACT:
A method for sensing the location of a casing collar within a wellbore and for orientating a tool circumferentially and radially employs the use of a compact dual-purpose magnet. The method includes offsetting the position of the magnet relative to the tool's centerline to carry out the magnet's purpose of orientating the tool. An inductive pickup coil is placed within the magnet's magnetic field to carry out the magnet's second purpose of sensing the location of a casing collar. The method is used in logging the location of casing collars, splitting casing collars, and perforating casings.

REFERENCES:
patent: 3110257 (1963-11-01), Lebourg
patent: 3165153 (1965-01-01), Lanmon
patent: 3182724 (1965-05-01), Shore
patent: 4153118 (1979-05-01), Hart
patent: 5720344 (1998-02-01), Newman

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