Patent ID: 8464785
Filing Date: 2013-06-18
Classification: E21B

Abstract:
1. A pipe shear ram assembly, comprising: a housing having a bore extending vertically therethrough for the passage of a pipe string and having a bore axis; first and second ram blocks, having first and second blades, respectively, the blades being positioned such that one slides over the other when the first and second ram blocks are moved forward to a closed position; a pair of guide arms protruding from the first ram block toward the second ram block, each of the guide arms being axially spaced from the first blade and located at a different elevation on the first ram block than the first blade; and each of the guide arms having a tip and a wedge surface on an inboard side of each of the guide arms, each of the wedge surfaces extending from the tip toward the first ram block to a rearward end of each of the wedge surfaces, each of the wedge surfaces being devoid of additional aligning structure from the tip to the rearward end for contacting and guiding the pipe string toward the bore axis of the bore in the event the first and second ram blocks are moved to the closed position.