US2003116049A1PendingUtilityA1

Pre-fragmented shaped charge

34
Priority: Dec 21, 2001Filed: Dec 21, 2001Published: Jun 26, 2003
Est. expiryDec 21, 2021(expired)· nominal 20-yr term from priority
Inventors:Chenghua Han
F42B 12/24F42B 1/02
34
PatentIndex Score
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Claims

Abstract

The present invention provides an apparatus and method for controlling the debris generated by shaped charges during perforating. The controlled debris perforating system comprises a pre-fragmented shaped charge having a charge case and an explosive material.

Claims

exact text as granted — not AI-modified
What is claimed is:  
     
         1 . A controlled debris perforating system, comprising: 
 a pre-fragmented shaped charge having a charge case and an explosive material.    
     
     
         2 . The controlled debris perforating system of  claim 1 , wherein the charge case defines at least one slot.  
     
     
         3 . The controlled debris perforating system of  claim 2 , wherein the at least one slot is axially oriented.  
     
     
         4 . The controlled debris perforating system of  claim 2 , wherein the at least one slot is circumferentially oriented.  
     
     
         5 . The controlled debris perforating system of  claim 2 , wherein the at least one slot is a U-notched groove.  
     
     
         6 . The controlled debris perforating system of  claim 2 , wherein the at least one slot is a V-notched groove.  
     
     
         7 . The controlled debris perforating system of  claim 2 , wherein the at least one slot is an external slot.  
     
     
         8 . The controlled debris perforating system of  claim 2 , wherein the at least one slot is an internal slot.  
     
     
         9 . A method of controlling the debris during perforating, comprising: 
 providing a pre-fragmented shaped charge having a charge case defining a plurality of grooves.    
     
     
         10 . The method of  claim 9 , wherein the plurality of grooves are axially oriented.  
     
     
         11 . The method of  claim 9 , wherein the plurality of grooves are circumferentially oriented.  
     
     
         12 . A shaped charge made by a process, comprising: 
 inserting an explosive into a case;    inserting a liner over the main body of explosive; and    machining a plurality of slots in the case.    
     
     
         13 . The shaped charge made by the process of  claim 12 , wherein the plurality of slots are U-notched grooves.  
     
     
         14 . The shaped charge made by the process of  claim 12 , wherein the plurality of slots are V-notched grooves.  
     
     
         15 . The shaped charge made by the process of  claim 12 , wherein the plurality of slots are machined externally.  
     
     
         16 . The shaped charge made by the process of  claim 12 , wherein the plurality of slots are machined internally.  
     
     
         17 . A method of using one or more pre-fragmented shaped charges in a well, comprising: 
 providing a perforating string having one or more pre-fragmented shaped charges; and    conveying the perforating string into the well.    
     
     
         18 . The method of  claim 17 , wherein the perforating string comprises a loading tube and carrier.  
     
     
         19 . The method of  claim 17 , wherein the perforating string comprises a spiral gun.  
     
     
         20 . The method of  claim 17 , wherein the perforating string comprises a strip gun.

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