Shear blade geometry and method

摘要

A pair of shear blades and a blowout preventer having the pair of shear blades. The shear blades are configured to cut a tubular inside the blowout preventer. The shear blades have different geometries of the front cutting surfaces. One geometry promotes a secure positioning of the tubular relative to the first blade while the second geometry promotes a puncturing of the tubular by the second blade. Figure 4E 68 54 80 62 86 Figure 4A 82 Figure 4B 52 5 86) 64t5 Figure 4D 8 64 Figure 4C