Patent ID: 7243733

Claim:
A cup tool for providing a high-pressure fluid-tight seal with a tubing or a casing in a wellbore, the cup tool comprising: a cup tool tube having a threaded upper end for connection to a high-pressure mandrel, the cup tool tube having an outer surface over which an elastomeric cup is slidably mounted for movement from an unset position for entry of the cup tool into the tubing or casing to a set position in which an annular gap between the cup tool and the tubing or casing is obstructed by a top end of the elastomeric cup to contain fluid pressure below a bottom of the elastomeric cup, the cup tool tube including an annular jump step located below the threaded upper end, the annular jump step having a flat lower face and an outer diameter large enough to inhibit movement of the elastomeric cup to the set position during insertion of the cup tool into the tubing or casing; and a gauge ring located between the annular jump step and the high pressure mandrel, the gauge ring having a larger diameter than the annular jump step to form the annular gap between the cup tool and the tubing or casing.