E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 47/09 (2006.01) E21B 19/00 (2006.01) E21B 19/22 (2006.01) E21B 33/06 (2006.01) G01N 27/90 (2006.01)
Patent
CA 2425565
A method and apparatus for detecting ferrous changes passing axially through a cylindrical space. In one embodiment, the method comprises surrounding the cylindrical space with a nonmagnetic cylinder having an outer wall and a cylindrical axis; creating an alternating magnetic field in the cylindrical space, the magnetic field created by a rotatable permanent magnet; monitoring the magnetic field with magnetic flux sensors placed outside the outer walls; and detecting changes in the magnetic field as ferrous matter passes axially through the cylindrical space. In other embodiments, the apparatus identifies ferrous changes as the tool joints that connect a jointed tubing string as the tubing string is moved in or out of a well bore, or as the presence or absence of a coiled tubing string in the well bore.
Burlington John S.
Falcon Jonathan J.
Macinnis Jason P.
Relton Mahendran S.
Borden Ladner Gervais Llp
Smith International Inc.
Thomas Energy Services Inc.
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