Petroleum production by underground combustion
United States Patent 2862557

Inventors:
Utenhove, Gerard Baron Van F. L.
Tadema, Harco J.
Kets, Dirk C.
Publication Date:
12/02/1958
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Assignee:
Shell, Dev
Primary Class:
166/250.150
Other Classes:
166/256
International Classes:
E21B43/243; E21B43/16