Reactive gas shaped charge and method of use

Abstract

A perforating system including a perforating gun having a perforating gun body housing shaped charges oriented outwardly from the gun body and connected to a detonation system for deployment into a wellbore. The shaped charges include at least a case, a liner and explosive material that is thermally stable and of a composition that allows for reaction with metals, debris or formation walls in order to improve fluid flow from the formation upon perforating. Shaped charge can also employ differences in composition moving from the apex to the skirt of the liner in order to achieve different perforating characteristics upon detonation of the explosive material.

What is claimed is: 
     
         1 . A shaped charge comprising:
 a case;   a liner; and   an explosive material positioned between the case and the liner.   
     
     
         2 . The shaped charge of  claim 1  wherein the explosive material is thermally stable above 100 degrees F. 
     
     
         3 . The shaped charge of  claim 1  wherein the explosive material comprises 4,4′-dichloro-2,2′, 3,3′, 5,5′, 6,6′-octanitroazobenzene (DCONAB). 
     
     
         4 . The shaped charge of  claim 1  wherein the explosive material comprises a congener of 4,4′-dichloro-2,2′, 3,3′, 5,5′, 6,6′-octanitroazobenzene (DCONAB). 
     
     
         5 . The shaped charge of  claim 2  wherein the liner comprises a powder metal material differing in composition from an apex to a skirt of the liner. 
     
     
         6 . The shaped charge of  claim 3  wherein the liner comprises a powder metal material differing in composition from an apex to a skirt of the liner. 
     
     
         7 . The shaped charge of  claim 4  wherein the liner comprises a powder metal material differing in composition from an apex to a skirt of the liner. 
     
     
         8 . The shaped charge of  claim 1  wherein the liner comprises a powder metal material of one or more of tungsten (W) powder, copper (Cu) powder, lead (Pb) powder, or titanium (Ti) powder. 
     
     
         9 . A method comprising:
 disposing a perforating gun in the well, wherein the perforating gun comprises a shaped charge having a charge case, an explosive disposed inside the charge case, and a liner for retaining the explosive in the charge case; and   detonating the shaped charge to form a perforation tunnel in a formation zone whereby byproduct gas resulting from the explosion reacts with metal, debris and/or the formation to improve flow.   
     
     
         10 . The method of  claim 9  wherein the explosive comprises 4,4′-dichloro-2,2′, 3,3′, 5,5′, 6,6′-octanitroazobenzene (DCONAB). 
     
     
         11 . The shaped charge of  claim 9  wherein the explosive material comprises a congener of 4,4′-dichloro-2,2′, 3,3′, 5,5′, 6,6′-octanitroazobenzene (DCONAB). 
     
     
         12 . The shaped charge of  claim 10  wherein the liner comprises a powder metal material differing in composition from an apex to a skirt of the liner. 
     
     
         13 . The shaped charge of  claim 11  wherein the liner comprises a powder metal material differing in composition from an apex to a skirt of the liner. 
     
     
         14 . The shaped charge of  claim 9  wherein the liner comprises a powder metal material differing in composition from an apex to a skirt of the liner. 
     
     
         15 . The shaped charge of  claim 9  wherein the liner comprises a powder metal material of one or more of tungsten (W) powder, copper (Cu) powder, lead (Pb) powder, or titanium (Ti) powder. 
     
     
         16 . The shaped charge of  claim 10  wherein the liner comprises a powder metal material of one or more of tungsten (W) powder, copper (Cu) powder, lead (Pb) powder, or titanium (Ti) powder. 
     
     
         17 . The shaped charge of  claim 11  wherein the liner comprises a powder metal material of one or more of tungsten (W) powder, copper (Cu) powder, lead (Pb) powder, or titanium (Ti) powder. 
     
     
         18 . The method of  claim 9  further comprising performing at least one of the following: (i) pumping an acid downhole, (ii) pumping a fracturing fluid downhole, (iii) pumping an injection fluid downhole, and (iv) circulating a completion or wellbore fluid downhole to clear residue and debris from the perforation tunnel.