| 摘要 |
A rotating blowout preventor having a special stripper rubber with reinforcement means incorporated therein in indexed relationship with a kelly drive bushing so that when the kelly is telescopingly received through the rotating blowout preventor, the corners of the kelly drivingly engage both the kelly drive bushing and stripper rubber in indexed relationship therewith. The stripper rubber is provided with spaced-apart reinforcing fingers which sealingly engage the sidewalls of the kelly in an improved manner. The reinforcing fingers are arranged respective to one another to receive the corners of the kelly midway therebetween, so that the kelly outwardly deforms the resilient stripper rubber substantially more at the area which receives the kelly corners as compared to the location of the reinforcing fingers. This geometrical configuration and arrangement of the kelly, kelly drive bushing, and improved stripper rubber greatly increases the life of the stripper rubber as well as providing improved sealing characteristics between the rotating, slidable kelly and the stripper rubber.
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