Patent ID: 7874371
Filing Date: 2011-01-25
Classification: E21B

Abstract:
1. A subsurface lubricator for lubricating a long tool string into a cased wellbore, comprising: a lubricator tube that houses the long tool string, the lubricator tube having a top end, a bottom end, an adaptor flange connected to the top end and an injector plate connected to the adaptor flange; a bidirectional packoff tool connected to the bottom end, the bidirectional packoff tool comprising an upper sealing element that traps pressurized fluid injected into an annulus between a casing of the cased wellbore and the lubricator tube, and a lower sealing element between the upper sealing element and a bottom end of the bidirectional packoff tool, the lower sealing element isolating a wellhead of the cased wellbore from fluid pressure in the cased wellbore below the bottom end of the bidirectional packoff tool; and an anchor plate for anchoring the subsurface lubricator to the wellhead of the cased wellbore.