Protective device for RF applicator in in-situ oil shale retorti

Details Protective device for RF applicator in in-situ oil shale retorti Protective device for RF applicator in in-situ oil shale retorti

1981-05-20

1987-04-28

Leppink, James A.

Wells

With heating, refrigerating or heat insulating means

Electrical heater in well

219 1055R, E21B 3604

Patent

active

046606360

ABSTRACT:
In the in-situ retorting of oil shale using radio frequency electrical energy, an applicator is inserted into a borehole and energized at a radio frequency. A protective device protects the applicator from expansion of the oil shale formation. The protective device includes an end plate attached to the applicator and a plurality of elements surrounds the applicator and is in contact with the end plate so as to prevent the oil shale formation from contacting the applicator.

REFERENCES:
patent: 1568027 (1925-12-01), Swan
patent: 2308473 (1943-01-01), Wadman
patent: 3068339 (1962-12-01), Kay
patent: 3133592 (1964-05-01), Tomberlin
patent: 4193448 (1980-03-01), Jeambey
patent: 4315699 (1982-02-01), Lusk

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