Tree saver packer cup

Claim 1

A tree saver in combination with a Christmas Tree assembly, said tree saver being coupled to the upper end thereof and having an advanceable and retractable mandrel which has a packer assembly adapted to seal said mandrel to a string of tubing which is coupled to the lower end of said Christmas Tree assembly, the improvement wherein said packer cup assembly comprises an elongated metal tubular member having an outer diameter such that it will fit closely but slideably within said tubing, said tubular member having a first open ended part coupled and sealed against said mandrel, a second end part of reduced outer diameter having a flexible open ended section and an outer wall surface, and a yieldable sleeve including an inwardly tapered unattached end, said sleeve fitting closely over and being bonded to the outer wall surface of said second end part of reduced outer diameter, said sleeve extending substantially beyond said tubular member in the direction away from said first open ended part and having an outer diameter which fits closely but slidably in sealing contact within said string of tubing when said mandrel is advanced therein, the part of said sleeve beyond said tubular member and the open lower end of said second part of reduced outer diameter having an outwardly extending gradually tapered inner wall surface which is of maximum diameter at the end extending beyond said tubular member.