Patent ID: 7278477

Claim:
A cup tool for providing a high-pressure fluid-tight seal in an annular gap between a high-pressure mandrel and a cased wellbore, the cup tool comprising: a cup tool tube having a threaded upper end for connection to the high-pressure mandrel, the cup tool tube having an outer surface over which an elastomeric cup is slidably mounted for reciprocal movement from an unset position for entry of the cup tool into the wellbore to a set position in which the annular gap is obstructed to contain fluid pressure below the elastomeric cup, the outer surface of the cup tool tube having a lower portion of a first diameter and an upper portion with a second, larger diameter and a tapered region between the upper portion and the lower portion; and the elastomeric cup including a lip seal that rides against the outer surface of the cup tool tube, and seals against the tapered region of the cup tool tube to provide a high pressure seal between the cup tool tube and the elastomeric cup when the elastomeric cup is in the set position.