Patent ID: 7604050

Claim:
A test plug tool used to test a pressure integrity of a joint between a production casing to a wellhead stack assembly, comprising: a tubular member that suspends a test plug in the production casing; a hanger flange located above the test plug, the hanger flange having a bottom shoulder received in a bowl-shaped abutment above a top end of the production casing in the wellhead stack assembly, and further including at least one peripheral groove for retaining at least one high-pressure seal that provides a fluid seal between the hanger flange and the wellhead stack assembly; a fluid passage through a sidewall of the tubular member, the fluid passage being located below the hanger above the test plug; and the test plug comprises a cup tool that includes an elastomeric cup for sealing against an inside of the production casing, an annular sealing element compressed against the inside of the production casing by the elastomeric cup, and a gauge ring that inhibits the elastomeric sealing element from being extruded into an annulus between a bullnose and the inside of the production casing.