Wellhead and control stack pressure test plug tool

A test plug tool used to test a pressure integrity of a joint between a production casing and wellhead stack assembly, comprising:

• a tubular member having a pin threaded top end and a bottom end that suspends a test plug inside the production casing;
• a hanger flange located below the pin threaded top end, the hanger flange having a bottom shoulder received in a bowl-shaped abutment in the wellhead stack assembly, the hanger flange including at least one peripheral groove for retaining at least one high-pressure fluid seal that seals between the hanger flange and the wellhead stack assembly;
• a fluid passage through a sidewall of the tubular member, the fluid passage communicating with an inside of the tubular member, and is located below the hanger flange and above the bottom end of the tubular member;
• and
• the test plug comprises a cup tool comprising an elastomeric cup that engages the inside of the production casing, an annular sealing element compressed against the production casing by the elastomeric cup when the elastomeric cup is subjected to fluid pressure that moves the elastomeric cup against the annular sealing element, and a gauge ring that inhibits extrusion of the annular sealing element into an annulus between the bullnose and the production casing when the elastomeric cup is subjected to the fluid pressure.

A test plug tool used to test a pressure integrity of a joint between a production casing and a wellhead stack assembly, comprising:

• a tubular member for suspending a test plug inside a top end of the production casing, the tubular member having a pin threaded top end for threaded engagement with a flanged adapter for sealing a top of the wellhead stack assembly;
• a hanger flange located below the pin threaded top end, the hanger flange having a bottom shoulder received in a bowl-shaped abutment in a tubing head spool of the wellhead stack assembly, the hanger flange including at least one peripheral groove for retaining an O-ring seal that provides a fluid seal between the hanger flange and the tubing head spool;
• and
• a fluid passage through a sidewall of the tubular member, the fluid passage being located below the hanger flange and above the test plug.