Patent ID: 7584798

Claim:
A subsurface lubricator for lubricating a long tool string into a cased wellbore, comprising: a lubricator tube for housing the long tool string, the lubricator tube having a top end connected to an adapter flange which permits any compatible flanged component to be mounted to the top end of the subsurface lubricator, an injector plate connected to the adaptor flange in a radial orientation and a bottom end; a bidirectional packoff tool connected to the bottom end of the lubricator tube, the bidirectional packoff comprising a central passage with an internal diameter that is the same as an internal diameter of the lubricator tube, an upwardly oriented 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 a mechanism that induces controlled linear motion of the lubricator tube to lubricate the lubricator tube through the wellhead of the cased wellbore so that the bidirectional packoff tool is located in a top of the casing of the cased wellbore, in which location pressurized fluid can be supplied through a port of the wellhead to lubricate the lubricator tube further into the casing by applying fluid pressure to the upper sealing element of the bidirectional packoff tool.