Abstract: An annular safety assembly comprising, between an upper cylindrical body and a lower cylindrical body, through which connecting tubes of production tubes pass, a packer and a low-bulk anchorage system consisting of a radial spacing ring, a resilient anchorage ring split along a generatrix and provided with peripheral anchorage teeth and a thrust ring which can be moved upwardly by thruster-plungers extending from the lower cylindrical body to apply the anchorage ring to the casing, and a safety valve arranged separately from the connecting tubes, which extend between the said cylindrical bodies, and below the lower cylindrical body.

Abstract: A connector for incorporation in a production tube for an oil well, below the packer, comprises a closing flap which closes when a first retractable ball seat is displaced downwards, in order to provide a safety device during the installation of the well head, and above the flap, a second retractable ball seat which, when it is moved away axially downwards, causes the flap to open and be maintained in the open position, in order to put the well in a state of production. The balls seats are provided in the upper portions of two resiliently radially expandable sleeves and are displaced downwardly by the application of fluid pressure to the space within the production tube above their other closure of the respective seat by a ball dropped on to the seat from above.