Boring or penetrating the earth – With signaling – indicating – testing or measuring
Reexamination Certificate
2006-07-25
2006-07-25
Bagnell, David (Department: 3672)
Boring or penetrating the earth
With signaling, indicating, testing or measuring
C175S041000, C166S066500
Reexamination Certificate
active
07080699
ABSTRACT:
A gap collar for an electromagnetic communication unit of a downhole tool positioned in a wellbore is provided. The downhole tool communicates with a surface unit via an electromagnetic field generated by the electromagnetic communication unit. The gap collar includes a first collar having a first end connector and a second collar having a second end connector matingly connectable to the first end connector. The gap collar further includes a non-conductive insulation coating disposed on the first and/or second end connectors, and a non-conductive insulation molding positioned about an inner and/or outer surface of the collars. The insulation molding moldingly conforms to the shape collars. The connectors are provided with mated threads modified to receive the insulation coating. Measurements taken by the downhole tool may be stored in memory, and transmitted to the surface unit via the electromagnetic field.
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He Qingyan
Lovell John
Shray Frank
Bagnell David
Coy Nicole
Echols Brigitte L.
Salazar J. L. Jennie
Schlumberger Technology Corporation
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