Composite perforation device with scallops on the inner wall

Abstract

The present invention relates to a composite perforating device with scallops on its inner wall to improve the depth of penetration in the oil reservoir during perforation of oil and gas well. In one embodiment, the scallops on the inner wall of the gun body are located at a position corresponding to the open end of a perforating charge. In one embodiment, the scallop may have a stepped-cylindrical or truncated-conical inner peripheral surface and a conical or flat bottom surface. Alternatively, the scallop may have an inner conical surface. The scallops on the inner wall of the gun body increased the burst heights of the perforating charges such that the penetration depth of the perforating device is increased.

What is claimed is: 
     
         1 . A composite perforating device comprising a gun body and one or more scallops on the inner wall of the gun body, wherein each of said scallop is located opposite to the open end of a perforating charge  2 . 
     
     
         2 . The composite perforating device of  claim 1 , wherein said scallop is for increasing the burst height of the perforating charge. 
     
     
         3 . The composite perforating device of  claim 1 , wherein said scallop has a stepped-cylindrical inner surface, and flat or conical bottom surface. 
     
     
         4 . The composite perforating device of  claim 1 , wherein said scallop has a conical inner surface. 
     
     
         5 . The composite perforating device of  claim 1 , wherein said scallop has a cylindrical inner surface, and conical bottom surface. 
     
     
         6 . The composite perforating device of  claim 1 , wherein said scallop has a truncated-conical surface, and a flat bottom surface. 
     
     
         7 . The composite perforating device of  claim 1 , wherein said scallop has a truncated-conical surface, and a conical bottom surface. 
     
     
         8 . The composite perforating device of  claim 1 , wherein said scallop comprises a stepped through hole in the gun body and a sealing cap mounted onto the step of said stepped through hole. 
     
     
         9 . The composite perforating device of  claim 8 , wherein said sealing cap has a flat bottom surface. 
     
     
         10 . The composite perforating device of  claim 8 , wherein said sealing cap has a concave spherical bottom surface.