Wells – Processes – With indicating – testing – measuring or locating
Reexamination Certificate
2006-06-27
2006-06-27
Dang, Hoang (Department: 3672)
Wells
Processes
With indicating, testing, measuring or locating
C166S066000, C166S177400, C166S250030, C166S250120, C166S250140
Reexamination Certificate
active
07066256
ABSTRACT:
An apparatus for use in circulating cement in a casing in a wellbore is described having a first component such as a sensor disposed on the casing and a second component such as a detectable device disposed at a fluid interface formed between the cement and a fluid. The sensor may be a sensor coil mounted on the perimeter of the lower end of the casing, while the detectable device may be a transponder capable of emitting Radio Frequency Identification signals to the sensor to signal its arrival at the lower end of the casing. The transponder may be encased in a protective covering. Also described is a method of cementing a casing utilizing a first component such as a sensor disposed on the casing and a second component such as a detectable device disposed in the cement.
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Carlson Bradley T.
Dillenbeck Robert Lee
BJ Services Company
Dang Hoang
Howrey LLP
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