Measuring and testing – Borehole or drilling – Downhole test
Patent
1989-11-07
1990-05-29
Williams, Hezron E.
Measuring and testing
Borehole or drilling
Downhole test
166 70, 200 819M, E21B 3300
Patent
active
049285203
ABSTRACT:
A plug release indicator is provided which includes an elastomeric probe, with a wire embedded therein, which extends into the interior area of a plug housing or well casing. The wire has a lip at one end and an anchor at the other end, such that when a cementing plug contacts and deflects the probe, the lip moves thereby closing a micro-switch. The micro-switch closes an electrical indicating circuit including a power supply, indicator light, buzzer, or the like. In a second embodiment, a wire contacts the cementing plug and rotates a shaft containing a magnet therein. The magnet then activates a magnetic switch thereby closing the electrical indicating circuit. Another embodiment includes an electrically conductive surface embedded within an electrically insulating rotatable shaft. Upon rotation of the shaft, the conducting surface completes an electrical circiut through adjacent electrical contacts and the electrical indicating circuit is closed. Thus, the present invention indicates the precise instant when a cementing plug is released, or passes by the plug release indicator.
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patent: 4671353 (1987-06-01), Daming
Duzan James R.
Halliburton Company
McBurney Mark E.
O'Shea Kevin D.
Williams Hezron E.
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