Wells – Processes – With indicating – testing – measuring or locating
Reexamination Certificate
2008-05-08
2010-11-30
Stephenson, Daniel P (Department: 3676)
Wells
Processes
With indicating, testing, measuring or locating
C166S066500
Reexamination Certificate
active
07841403
ABSTRACT:
An apparatus for rotating an instrument in a wellbore includes a non magnetic housing configured to traverse the interior of the wellbore. The housing has an external diameter smaller than an internal diameter of a casing disposed in the wellbore. A plurality of electromagnets is arranged circumferentially about the interior of the housing and is configured to induce magnetic flux through a wall of the housing when actuated. A controller configured to sequentially rotationally actuate the electromagnets. A method for rotating a wellbore instrument in a wellbore includes causing parts of an instrument housing to be sequentially rotationally magnetically attracted to a casing disposed in the wellbore. The housing has a smaller external diameter than an internal diameter of the casing. The sequential rotational magnetic attraction is continued as needed.
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Marion Bruce P
Minto James
Flores Jonna
Fonsec Darla
Rutherford Charlotte
Schlumberger Technology Corporation
Stephenson Daniel P
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