Non-metallic whipstock

Abstract

A whipstock that is totally to substantially non-metallic is made preferably form a composite material. The body can include one or more stiffeners that are also preferably non-metallic. The mounting lug for the window mill can also be non-metallic. A metallic base can be uses to connect to an anchor. Optionally the ramp can include a plate that is optionally internally supported. Alternatively the ramp can include hardened inserts or other wear resistant material. Composite materials that can me molded are preferred.

1 . A whipstock, comprising: 
 a body further comprising a ramp wherein said body is mostly non-metallic.    
   
   
       2 . The whipstock of  claim 1 , wherein: 
 said body is at least 80% non-metallic.    
   
   
       3 . The whipstock of  claim 2 , wherein: 
 said body is fully non-metallic.    
   
   
       4 . The whipstock of  claim 1 , wherein: 
 said ramp is fully non metallic.    
   
   
       5 . The whipstock of  claim 1 , wherein: 
 said ramp is substantially covered by a metallic plate.    
   
   
       6 . The whipstock of  claim 1 , wherein: 
 said ramp comprises wear resistant particles extending from said ramp.    
   
   
       7 . The whipstock of  claim 5 , wherein: 
 said body comprises a bore extending from said ramp and a support connected to said plate extending in said bore.    
   
   
       8 . The whipstock of  claim 1 , further comprising: 
 a removable bottom sub that is non metallic.    
   
   
       9 . The whipstock of  claim 1 , further comprising: 
 a removable bottom sub that is metallic.    
   
   
       10 . The whipstock of  claim 7 , wherein: 
 said support rests on said bottom sub.    
   
   
       11 . The whipstock of  claim 1 , further comprising: 
 stiffeners mounted substantially within said body.    
   
   
       12 . The whipstock of  claim 11 , wherein: 
 said stiffeners are non-metallic.    
   
   
       13 . The whipstock of  claim 11 , wherein: 
 said stiffeners are metallic.    
   
   
       14 . The whipstock of  claim 1 , wherein: 
 said stiffeners comprise elongated members that run generally longitudinally in said body.    
   
   
       15 . The whipstock of  claim 1 ,wherein: 
 said non-metallic portions comprise composites.    
   
   
       16 . The whipstock of  claim 15 , wherein: 
 said non-metallic portions further comprise fiber reinforcement.    
   
   
       17 . The whipstock of  claim 6 , wherein: 
 said particles comprise carbide.