Patent ID: 7207382
Filing Date: 2007-04-24
Classification: E21B

Abstract:
1. A system for shearing an oil field tubular product, comprising: a. a blowout preventer body having an opening disposed therethrough for the tubular product; b. a first ram coupled to the blowout preventer body along a first guideway formed in the body having a guide surface for the first ram disposed at an angle to a centerline of the opening, comprising: c. a second ram coupled to the blowout preventer body along a second guideway formed in the body having a guide surface for the second ram disposed at an angle to a centerline of the opening, comprising: d. a first actuator coupled to a first ram and adapted to move the first ram toward the centerline; and e. a second actuator coupled to the second ram and adapted to move the second ram toward the centerline, wherein first ram block comprises a second arcuate retainer stop disposed away from the centerline relative to the first arcuate retainer stop, the first and second arcuate retainer stops having a common centerpoint, and wherein the sealing element comprises a sealing element arcuate surface disposed away from the centerline relative to the first retainer and having a common centerpoint with the first arcuate surface of the first retainer, the sealing element arcuate surface sized to engage with the second arcuate retainer stop.