SHEAR BLOCK DESIGN FOR BLOWOUT PREVENTER

摘要

Present embodiments of the disclosure are directed to a blowout preventer having a ram unit designed to shear wellbore tubulars with a range of diameters. The ram unit may include a first shear block having a first blade profile, and a second shear block having a second blade profile. The blade profiles may each feature an angled portion for contacting the wellbore tubular. The angled portion of the first blade profile may be a different size (e.g., width dimension) than the angled portion of the second blade profile. This may enable the larger angled portion to support a smaller tubular while contact points on the smaller angled portion apply a force for shearing the tubular. With larger tubulars, an initial edge of the blade profile with the smaller angled portion may support the tubular while contact points on the larger angled portion apply a force for shearing the tubular.

主权项

1. A blowout preventer, comprising:
a ram unit comprising a first shear block and a second shear block, wherein the ram unit is configured to force the first shear block and the second shear block together to shear and seal a wellbore tubular disposed within the ram unit; wherein the first shear block comprises a first blade profile having an angled section with a first width for contacting a wellbore tubular, and wherein the second shear block comprises a second blade profile having an angled section with a second width for contacting the wellbore tubular, wherein the first width is larger than the second width.