System and methods for detecting casing collars

Details System and methods for detecting casing collars System and methods for detecting casing collars

2005-05-24

2005-05-24

Bagnell, David (Department: 3672)

Wells

Processes

With indicating, testing, measuring or locating

C166S066000, C073S152540

Reexamination Certificate

active

06896056

ABSTRACT:
A tubing conveyed casing collar locator system that detects the casing collars in a wellbore and acoustically transmits the information through the tubing to the surface where it is detected and processed in a surface processor. The system comprises a downhole tool which comprises downhole sensors, a signal processor with memory, a drive circuit, a battery pack, and a signal generator. The surface system comprises a surface processor, depth system, and acoustic signal transmitter/receiver. The downhole tool detects casing collars as the tool is moved through the collar and acoustically transmits the data or stores the data in downhole memory according to programmed instructions. In one embodiment, the tool compares sensor signals from production elements, such as valves, to stored sensor signatures to uniquely identify the downhole element. In one embodiment, the downhole tool changes operating modes in response to surface command.

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“A New Method for Communicating Downhole Sensor Data Within the Annulus of a Production Well”; Authors: J. V. Leggett III & B. R. Green, Society of Petroleum Engineers 28522; SPE 69thAnnual Technical Conference & Exhibition, New Orleans, LA, Sept. 25-28, 1994; pp. 33-42.
“Method and Apparatus for Improved Acoustic Coupling for Acoustic Signal Communication in a Wellbore”, Research Disclosure, May 1999, 622-625.

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