Shaped charge utilizing polymer coated petn

Abstract

A shaped charge for perforating a formation surrounding a wellbore. The shaped charge including a casing having a section with polymer-coated explosives and a liner encapsulating the section with the polymer coated explosives. The polymer-coated explosives includes a booster explosive and a main load explosive. The booster explosive and the main load explosive are PETN. The polymer is a low-density polyethylene.

What is claimed is: 
     
         1 . A shaped charge for perforating a formation surrounding a wellbore, the shaped charge device comprising:
 a casing having a section loaded with polymer-coated explosives; and   a liner encapsulating the section with the polymer coated explosives.   
     
     
         2 . The shaped charge of  claim 1  wherein the casing is made of at least one of steel, copper, brass, zinc, aluminum, ceramics, and glass. 
     
     
         3 . The shaped charge of  claim 1  wherein the liner is made of at least one of copper, lead, brass, bismuth, tin, zinc, silver, antimony, cobalt, nickel, tungsten, uranium and other malleable, ductile metals. 
     
     
         4 . The shaped charge of  claim 1  wherein the liner is one of conical, parabolic, and hemispherical shape. 
     
     
         5 . The shaped charge of  claim 1  wherein the explosives are a booster explosive and a main load explosive. 
     
     
         6 . The shaped charge of  claim 5  wherein the booster explosive and the main load explosive are PETN. 
     
     
         7 . The shape charge of  claim 1  wherein the polymer is a low-density polyethylene. 
     
     
         8 . The shaped charge of  claim 1  wherein the section filled with the polymer coated explosive includes a first section with a first polymer-coated explosive and a second section with a second polymer-coated explosive. 
     
     
         9 . The shape charge of  claim 8  wherein the first section and the second section define a single shared space, and include a first and second polymer-coated explosive that are the same. 
     
     
         10 . A method of using shaped charges for perforating a formation surrounding a wellbore, the method comprising:
 placing shaped charge devices on a well casing;   setting the well casing in the wellbore using a downhole running tool; and   detonating the shaped charge devices;   wherein the shaped charge devices comprise:
 a casing having a section loaded with polymer-coated explosives; and 
 a liner encapsulating the section with the polymer coated explosives. 
   
     
     
         11 . The method of using shaped charges of  claim 10  wherein the casing is made of at least one of steel, zinc, copper, brass, aluminum, ceramics, and glass. 
     
     
         12 . The method of using shaped charges of  claim 10  wherein the liner is made of at least one of copper, lead, brass, bismuth, tin, zinc, silver, antimony, cobalt, nickel, tungsten, uranium and other malleable, ductile metals. 
     
     
         13 . The method of using shaped charges of  claim 10  wherein the liner is one of conical, parabolic, and hemispherical shape. 
     
     
         14 . The method of using shaped charges of  claim 10  wherein the explosives are a booster explosive and a main load explosive. 
     
     
         15 . The method of using shaped charges of  claim 14  wherein the booster explosive and the main load explosive are PETN. 
     
     
         16 . The method of using shaped charges of  claim 10  wherein the polymer is a low-density polyethylene. 
     
     
         17 . The method of using shaped charges of  claim 10  wherein the section filled with the polymer coated explosive includes a first section having a first polymer-coated explosive and a second section having a second polymer-coated explosive. 
     
     
         18 . The method of using shaped charges of  claim 17  wherein the first section and the second section are common, and include a first and second polymer-coated explosive that are common. 
     
     
         19 . A shaped charges for perforating a formation surrounding a wellbore, the shaped charge device comprising:
 a casing enclosing a polymer-coated booster explosive and a polymer-coated main load explosive and a liner encapsulating the polymer-coated explosives.   
     
     
         20 . The shaped charges of  claim 19  wherein the explosive is PETN.