Remotely operated downhole switching apparatus

Communications: electrical – Wellbore telemetering or control – In horizontal or inclined passage arrangement

Patent

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Details

73152, 307127, 340857, E21B 4700, E21B 4706

Patent

active

045231940

ABSTRACT:
A remotely operated downhole switching apparatus, particularly adapted to selectively connect a downhole device such as a sensor circuit to a cable which supplies power to a downhole motor includes a switch for connecting the downhole device to a neutral node of the motor, a latch coil responsive to a latching signal carried by the cable for closing the switch, and a delatch coil connected to the cable through a frequency responsive circuit which is responsive to a delatching signal carried by the cable for passing current through the delatch coil. A diode connected to the delatch coil prevents current flow through the delatch coil in a direction which causes the switch to close. An AC signal may be employed for closing the switch, and a voltage pulse may be employed for opening the switch.

REFERENCES:
patent: 1933680 (1933-11-01), Ohl
patent: 1994325 (1935-03-01), Suits
patent: 2021753 (1935-11-01), Suits
patent: 3284669 (1966-11-01), Boyd
patent: 3977245 (1976-08-01), Clark et al.
patent: 4093936 (1978-06-01), Eberline et al.
patent: 4157535 (1979-06-01), Balkanli
patent: 4178579 (1979-12-01), McGibbeny et al.

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