Abstract: A tubing hanging set for hanging, locking and sealing a submarine oil well includes a tubing hanger which is seated on an upper internal surface of a connection sleeve which in turn is seated on an internal surface of a casing hanger. The tubing hanger is provided with passageways extending therethrough and tubular extensions are connected in the passageways and to tubing passing through a double hydraulic packer. The lower end of one of the tubes passing through the packer extends into a oil producing zone and the other tube passing through the packer is in communication with an annular chamber between the other tubing and the casing. An installation tool is also provided which can be detachably connected to the tubing hanger for carrying out a method of installation of the tubing hanging set in a wellhead housing.