Abstract: In order to form galleries or other subterranean cavities in the bed of a sheet of water, for example for the construction of a subterranean reservoir for storing petroleum, or for exploiting submarine deposits, a floating structure, comprising at least one and preferably two hollow shafts, is ballasted so that it rests upon the seabed or underwater surface, a bore is excavated in extension of each hollow shaft, down to the desired depth, a casing tube is inserted there, extending to above the sheet of water, and one of said casings is used as an access means for the excavation of the galleries or cavities, whilst the other if used to remove the spoil.
Type:
Grant
Filed:
March 24, 1975
Date of Patent:
December 21, 1976
Assignees:
C. G. Doris (Compagnie Generale pour les Developement Operationnels des Richesses Sous-marines), Societe Francaise de Stockage Geologique GEOSTOCK
Inventors:
Christian Jackie Rederon, Gerard Pierre Souquet, Paul Louis Poulallion