Abstract: The subject of the present invention is an oil well production string hanger. A well comprises a production string, or tubing, through which the hydrocarbons flow, and a casing which supports the wall of the well. Between the two, there is an annular space used for control of the well. The tubing hanger fixed at the top of the well generally has two passages allowing communication with the tubing and with the annular space respectively. The invention relates to a tubing hanger with a single passage which gives access both to the tubing and to the annular space and allows the annular space to be plugged using a simple, economical, reliable and reversible method.

Abstract: A plastic tamper-proof sealing plug assembly for use in securely sealing the vale outlet of a pressurized bottle or any other type of container. The tamper-proof assembly has a tubular gasket provided with a central opening, sized to fit into and seal a valve outlet, and a sealing plug element with a plug projecting from it, which is sized to snugly fit into the tubular gasket in order to close the valve outlet. The tamper-proof assembly also has a security seal in the form of a strap has one end attached to one side of the sealing plug element and also has another free end. The strap projects outwards from the side of the sealing plug element and is long enough to surround the valve. The tamper-proof assembly further has a fastener for irreversibly fastening the free end of the strap to the sealing plug element so that the strap must be broken in order to remove the plug and the gasket if necessary, from the valve outlet.