Non-sealing casing shear rams

Abstract

Non-sealing casing shear rams are utilized in a blow out preventer (“BOP”) for shearing or cutting casing, but do not seal. The BOP with non-sealing casing shear rams with V-shaped blades has the shearing capabilities of a larger shear ram BOP while utilizing a smaller sized BOP to reduce the need for additional time, expense, and equipment. The non-sealing casing shear ram BOP may be used for drilling operations and during production without the need for swapping a larger shear ram BOP used for drilling to a smaller shear ram BOP for operations. The V-shape blade and back rake angle of the non-sealing casing shear ram blades produce the shearing force of the larger BOP in a smaller sized BOP.

1 . Upper and lower non-sealing casing shear rams for use in a BOP comprising an opening through said BOP, comprising:
 said upper and lower non-sealing casing shear rams each comprising V-shaped ram cutter blades, said V-shaped ram cutter blades comprising an angle of a V shape of said V-shaped ram cutter blades between 7½ degrees and 45 degrees with respect to a diameter line through said opening;   said upper and lower non-sealing casing cutter blades each comprising a back rake angle between 7 degrees and 25 degrees with respect to a coaxial line through said opening; and   said V-shaped ram cutter blades being configured to close and completely cut a pipe in said opening wherein an outer diameter of said pipe is at least 25% less than a diameter of said opening through said BOP.   
     
     
         2 . The upper and lower non-sealing casing shear rams of  claim 1 , wherein said angle of said V shape is between 30 and 40 degrees and said back rake angle is between 15 degrees and 35 degrees. 
     
     
         3 . The upper and lower non-sealing casing shear rams of  claim 1 , wherein said angle of said V shape is between 33 and 38 degrees and said back rake angle is between 15 degrees and 25 degrees. 
     
     
         4 . The upper and lower non-sealing casing shear rams of  claim 1 , wherein said angle of said V shape is 35 degrees and said back rake angle is 20 degrees. 
     
     
         5 . The upper and lower non-sealing casing shear rams of  claim 1 , wherein said angle of said V-shape is identical for said upper and lower non-seal casing shear rams. 
     
     
         6 . The upper and lower non-sealing casing shear rams of  claim 5 , wherein said back rake angle is the same for said upper and lower non-seal casing shear rams. 
     
     
         7 . The upper and lower non-sealing casing shear rams of  claim 5 , wherein said V-shaped ram cutter blade for said upper non-sealing casing shear ram is a mirror image of said V-shaped ram cutter blade for said lower non-sealing casing shear ram. 
     
     
         8 . The upper and lower non-sealing casing shear rams of  claim 1  further comprising said upper and lower non-sealing casing shear rams being operable to shear casing at least 9⅝ inches diameter wherein said BOP having a diameter of 13⅝ inches. 
     
     
         9 . The upper and lower non-sealing casing shear rams of  claim 1  wherein said V-shaped ram cutter blades being configured to close and completely cut a pipe in said opening wherein an outer diameter of said pipe is at least between 25% and 30% less than a diameter of said opening through said BOP. 
     
     
         10 . Upper and lower non-sealing casing shear rams for use in a BOP comprising an opening through said BOP, comprising:
 said upper and lower non-sealing casing shear rams each comprising V-shaped ram cutter blades, said V-shaped ram cutter blades comprising an angle of a V shape of said V-shaped ram cutter blades between 7½ degrees and 45 degrees with respect to a diameter line through said opening;   said upper and lower non-sealing casing shear rams being wider in diameter than said opening of said BOP;   said upper and lower non-sealing casing shear cutter blades each comprising a back rake angle between 7 degrees and 25 degrees with respect to a coaxial line through said opening;   said V-shaped ram cutter blades being configured to close and completely cut a pipe in said opening wherein an outer diameter of said pipe is at least 25% less than a diameter of said opening through said BOP; and   said upper and lower non-sealing casing shear rams each having no seals.   
     
     
         11 . The upper and lower non-sealing casing shear rams of  claim 10  further comprising said upper and lower non-sealing casing shear rams being operable to shear casing up to 9⅝″ diameter wherein said BOP having a diameter of 13⅝″. 
     
     
         12 . The upper and lower non-sealing casing shear rams of  claim 10  wherein said angle of said V shape is between 30 and 40 degrees and said back rake angle is between 15 degrees and 35 degrees. 
     
     
         13 . The upper and lower non-sealing casing shear rams of  claim 10 , wherein said angle of said V shape is between 33 and 38 degrees and said back rake angle is between 15 degrees and 25 degrees. 
     
     
         14 . The upper and lower non-sealing casing shear rams of  claim 10 , wherein said angle of said V shape is 35 degrees and said back rake angle is 20 degrees. 
     
     
         15 . The upper and lower non-sealing casing shear rams of  claim 10 , wherein said angle of said V-shape is identical for said upper and lower non-seal casing shear rams. 
     
     
         16 . The upper and lower non-sealing casing shear rams of  claim 10 , wherein said rake angle is the same for said upper and lower non-seal casing shear rams. 
     
     
         17 . The upper and lower non-sealing casing shear rams of  claim 10 , wherein said V-shaped ram cutter blade for said upper non-sealing casing shear ram is a mirror image of said V-shaped ram cutter blade for said lower non-sealing casing shear ram. 
     
     
         18 . The upper and lower non-sealing casing shear rams of  claim 10  wherein said V-shaped ram cutter blades being configured to close and completely cut a pipe in said opening wherein an outer diameter of said pipe is at least between 25% and 30% less than a diameter of said opening through said BOP. 
     
     
         19 . The upper and lower non-sealing casing shear rams of  claim 10  further comprising said upper and lower non-sealing casing shear rams being operable to shear casing at least 9⅝ inches diameter wherein said BOP having said opening being a diameter of 13⅝ inches. 
     
     
         20 . Upper and lower non-sealing casing shear rams for use in a BOP comprising an opening through said BOP, comprising:
 Upper and lower non-sealing casing shear rams for use in a BOP comprising an opening through said BOP, comprising:
 said upper and lower non-sealing casing shear rams each comprising V-shaped ram cutter blades, said V-shaped ram cutter blades comprising an angle of a V shape of said V-shaped ram cutter blades between 7½ degrees and 45 degrees with respect to a diameter line through said opening; 
 said upper and lower non-sealing casing cutter blades each comprising a back rake angle between 7 degrees and 25 degrees with respect to a coaxial line through said opening; and 
 said V-shaped ram cutter blades being configured to close and completely cut a pipe in said opening wherein an outer diameter of said pipe is at least 70% of a diameter of said opening through said BOP.