초록 ▼

A rotating blowout preventor having at least two rotating stripper rubber seals which provide a continuous seal about a kelly or drilling string having drilling string components of varying diameter. A stationary housing is designed to support a bearing assembly and a clamp cooperates with the housi

A rotating blowout preventor having at least two rotating stripper rubber seals which provide a continuous seal about a kelly or drilling string having drilling string components of varying diameter. A stationary housing is designed to support a bearing assembly and a clamp cooperates with the housing to secure the bearing assembly in the housing. Chilled water and/or antifreeze may be circulated through the top inner barrel seal of the bearing assembly and lubricant is pumped into the top seal for lubricating the seals and bearings that facilitate rotation of the stripper rubber seals, kelly and drilling string with respect to the stationary housing and pressurize the inner barrel seals and bearings to at least partially offset well pressure.

대표청구항 ▼

A rotating blowout preventor for an oil or gas well for resiliently engaging a drill string extending therethrough, comprising: a housing having a housing opening; a bearing assembly removably seated in said housing opening and having a passage, through which passage a drill string may extend; said

A rotating blowout preventor for an oil or gas well for resiliently engaging a drill string extending therethrough, comprising: a housing having a housing opening; a bearing assembly removably seated in said housing opening and having a passage, through which passage a drill string may extend; said bearing assembly having an outer generally cylindrical barrel and an inner generally cylindrical barrel having bearing elements positioned therebetween such that said inner barrel is mounted for rotation with respect to said outer barrel; a clamp assembly for engaging said housing and said outer barrel for removably securing said bearing assembly; a top rubber pot mounted on said inner barrel for rotation therewith; a first downwardly-converging seal mounted within said top rubber pot and having resilient engaging means for sealably engaging the drill string, said first downwardly-converging seal adapted to rotate in sealing engagement with the drill string; a second downwardly-converging seal mounted on said inner barrel in spaced relationship with respect to said first downwardly-converging seal and adapted to rotate in sealing engagement with said drill string; and said bearing assembly, top rubber pot, first downwardly-converging seal, said second downwardly-converging seal being removable as a unit for ease of replacement.