Sealing material to metal bonding compositions and methods for bonding a sealing material to a metal surface

Abstract

A downhole well tool having a component with a metal surface to which a sealing material is adhered is disclosed. The sealing material is bonded to the metal surface through the use of an energetic material disposed between the sealing material and the metal surface. Upon activation or initiation of the energetic material, the sealing material becomes bonded to the metal surface. A plastic layer may be disposed between the sealing material and the metal surface to facilitate bonding sealing material to the metal surface. The energetic material is used to bond the plastic layer to the metal surface and may be used to bond the plastic layer to the sealing material.

1 . A component of a downhole tool, the component comprising:
 a metal surface;   a sealing material; and   an energetic material, wherein the energetic material bonds the sealing material to the metal surface through activation of the energetic material.   
   
   
       2 . The downhole tool component of  claim 1 , wherein the energetic material comprises a thermite. 
   
   
       3 . The downhole tool component of  claim 2 , wherein the thermite comprises sub-micron thermite particles. 
   
   
       4 . The downhole tool component of  claim 1 , wherein the energetic material comprises at least one reactant for forming an intermetallic compound. 
   
   
       5 . The downhole tool component of  claim 4 , wherein at least one of the at least one reactants for forming the intermetallic compound comprises sub-micron reactant compound particles. 
   
   
       6 . The downhole tool component of  claim 1 , wherein the sealing material is selected from the group consisting of styrene-butadiene copolymer, neoprene, nitrile rubber, butyl rubber, polysulfide rubber, cis-1,4-polyisoprene, ethylene-propylene terpolymers, EPDM rubber, silicone rubber, polyurethane rubber, and thermoplastic polyolefin rubbers. 
   
   
       7 . The downhole tool component of  claim 6 , wherein the durometer hardness of the sealing material is in the range from about 60 to 100 Shore A. 
   
   
       8 . The downhole tool component of  claim 1 , wherein the metal surface is disposed on an outer surface of a housing of the downhole tool. 
   
   
       9 . The downhole tool component of  claim 8 , wherein the downhole tool is a sealing device. 
   
   
       10 . The downhole tool component of  claim 9 , wherein the sealing device is a packer. 
   
   
       11 . The downhole tool component of  claim 1 , wherein the sealing material is bonded directly to the metal surface by the energetic material, and the energetic material is capable of generating sufficient heat to cause the sealing material to at least partially melt and become bonded to the metal surface without an outer surface of the sealing material melting. 
   
   
       12 . The downhole tool component of  claim 1 , further comprising a plastic layer disposed between the sealing material and the metal surface, the plastic layer being bonded directly to the metal surface by the energetic material. 
   
   
       13 . A method of bonding a sealing material to a metal surface of a component of a downhole tool, the method comprising the steps of:
 (a) disposing an energetic material between a sealing material and a metal surface of a component of a downhole tool; and   (b) energizing the energetic material to create sufficient heat to cause the sealing material to be bonded to the metal surface of the component of the downhole tool.   
   
   
       14 . The method of  claim 13 , wherein the sealing material is first bonded to a plastic layer and the energetic material is disposed between the plastic layer and the metal surface of the component of the downhole tool prior to step (b). 
   
   
       15 . The method of  claim 13 , wherein the metal surface of the component of the downhole tool is first bonded to a plastic layer by disposing the energetic material between the plastic layer and the metal surface of the component of the downhole tool;
 the energetic material is then energized to bond the plastic layer to the metal surface of the component of the downhole tool; and   the sealing material is then bonded to the plastic layer.   
   
   
       16 . The method of  claim 15 , wherein the plastic layer is a perfluoroalkoxy material. 
   
   
       17 . The method of  claim 15 , wherein the sealing material is bonded to the plastic layer by disposing additional energetic material between the sealing material and the plastic layer and energizing the energetic material. 
   
   
       18 . The method of  claim 15 , wherein the energetic material comprises a thermite. 
   
   
       19 . The method of  claim 15 , wherein the energetic material comprises at least one reactant for forming an intermetallic compound. 
   
   
       20 . The method of  claim 13 , wherein a bonding metal is disposed on a bonding surface of the sealing material prior to step (b).