Asymmetric shaped charges and method for making asymmetric perforations

Abstract

There is a shaped charge for making an asymmetrical perforation into a casing. The shaped charge includes a case extending along a symmetry axis X and having a back wall and an open end; an explosive material located within the case; a liner located within the case, over the explosive material; a booster material; and an asymmetrical feature. The asymmetrical feature is selected to generate an asymmetrical perforation into the casing.

1 . A liner for covering an explosive material in a case of a shaped charge, the liner comprising:
 a metallic powdered material;   a binder that holds together the metallic powdered material; and   an insert located partially within the metallic powdered material,   wherein the liner has a concave shape.   
     
     
         2 . The liner of  claim 1 , wherein the insert is fully immersed within the liner. 
     
     
         3 . (canceled) 
     
     
         4 . The liner of  claim 1 , wherein the insert is asymmetric relative to a symmetry axis of the liner. 
     
     
         5 - 7 . (canceled) 
     
     
         8 . The liner of  claim 1 , wherein one face of the insert is flush with a surface of the liner and the remaining of the insert is fully embedded into the liner. 
     
     
         9 . (canceled) 
     
     
         10 . A shaped charge for making an asymmetric perforation in a casing of a well, the shaped charge comprising:
 a case extending along a symmetry axis X and having a back wall and an open end;   an explosive material located at the back wall of the case;   a liner located within the case, over the explosive material; and   a booster material located in a channel formed in the back wall of the case,   wherein the liner includes:   a metallic powdered material;   a binder that holds together the metallic powdered material; and   an insert located partially within the metallic powdered material,   wherein the liner has a concave shape.   
     
     
         11 - 27 . (canceled) 
     
     
         28 . A shaped charge for making an asymmetrical perforation into a casing, the shaped charge comprising:
 a case extending along a symmetry axis X and having a back wall and an open end;   an explosive material located within the case;   a liner located within the case, over the explosive material;   a booster material; and   an asymmetrical feature,   wherein the asymmetrical feature is selected to generate an asymmetrical perforation into the casing.   
     
     
         29 . The shaped charge of  claim 28 , wherein the asymmetrical feature is the liner being tilted relative the symmetry axis X so that one side of the liner touches the case at a first height and the other side of the liner touches the case at a second height, different from the first height. 
     
     
         30 . The shaped charge of  claim 29 , wherein the channel and the booster material are symmetrically distributed relative to the symmetry axis X. 
     
     
         31 . The shaped charge of  claim 28 , wherein the asymmetrical feature is that the symmetry axis X and an axis of symmetry X′ of the liner make a non-zero angle. 
     
     
         32 . The shaped charge of  claim 28 , wherein the asymmetrical feature is that the channel has a longitudinal axis X″, which makes a non-zero angle with the symmetry axis X. 
     
     
         33 . The shaped charge of  claim 32 , wherein the case, the explosive material and the liner are symmetrical relative to the symmetry axis. 
     
     
         34 . The shaped charge of  claim 32 , wherein the channel is offset relative to the symmetry axis. 
     
     
         35 . The shaped charge of  claim 28 , further comprising:
 another channel formed in the back wall of the case.   
     
     
         36 . The shaped charge of  claim 35 , wherein the another channel and the channel are asymmetrically located relative to the symmetry axis X. 
     
     
         37 . The shaped charge of  claim 28 , wherein the asymmetrical feature is that the booster material fires along an axis that is not the symmetry axis X. 
     
     
         38 . The shaped charge of  claim 28 , wherein the asymmetrical feature is that the booster material fires toward a side wall of the case. 
     
     
         39 . The shaped charge of  claim 28 , wherein the asymmetrical feature is that a first volume of the explosive material has a characteristic that is different from a second volume of the explosive material. 
     
     
         40 . The shaped charge of  claim 39 , wherein the characteristic is a density. 
     
     
         41 . The shaped charge of  claim 39 , wherein the characteristic is a chemical composition. 
     
     
         42 . The shaped charge of  claim 28 , wherein the asymmetrical feature is an insert placed inside the case. 
     
     
         43 . The shaped charge of  claim 42 , wherein the insert is fully embedded into the explosive material. 
     
     
         44 - 68 . (canceled)