Safety switch for well tools

Details Safety switch for well tools Safety switch for well tools

1980-02-19

1981-12-22

Pate, III, William F.

Boring or penetrating the earth

Boring with explosion in inaccessible hole

Firing control mechanically actuated in bore

175 452, 102301, 200 82R, E21B 4311

Patent

active

043066283

ABSTRACT:
A mechanical safety switch for closing electrical contacts in a well tool. The mechanical switch has several safety requirements which must be satisfied before the electrical contacts will close including upward pull on a wireline and a preselected value of fluid pressure exterior to the switch. The safety switch can be incorporated into a well perforating gun to provide safe, reliable operation of an electrically powered perforating gun by a conventional wireline. Preferably, the electrical circuits of the well perforating gun should include a motion sensor and a timer for increased safety.

REFERENCES:
patent: 3447604 (1969-06-01), Kinley et al.
patent: 3546478 (1970-12-01), Lindsey
patent: 3800705 (1974-04-01), Tamplen

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