Offset valve system for downhole drillable equipment

Abstract

Float equipment is constructed to have the check valve in an offset and/or skewed position with respect to the centerline of the tubular housing that is part of a string. The design is applicable to poppet type check valves as well as flapper type valves that are actuated with a flow tube. The off center and/or skewed position of the valve components allows the cutting structure on a drill bit, rather than the nozzle area on the bit bottom to make intimate contact with the valve components to accelerate the milling one of the assembly and the making of additional hole beyond the recently cemented string.

1 . A completion assembly, comprising: 
 a tubular housing having a longitudinal axis;    a valve member having a valve longitudinal axis in a flow path therethrough, wherein said axes are not aligned.    
   
   
       2 . The assembly of  claim 1 , wherein: 
 said axes are parallel.    
   
   
       3 . The assembly of  claim 1 , wherein: 
 said valve longitudinal axis is skewed with respect to the housing longitudinal axis.    
   
   
       4 . The assembly of  claim 3 , wherein: 
 said axes intersect.    
   
   
       5 . The assembly of  claim 1 , wherein: 
 said axes do not intersect.    
   
   
       6 . The assembly of  claim 1 , wherein: 
 said valve member comprises at least one spring loaded poppet.    
   
   
       7 . The assembly of  claim 1 , wherein: 
 said valve member comprises a flapper actuated by a flow tube.    
   
   
       8 . The assembly of  claim 1 , further comprising: 
 a bit having cutters surrounding circulation nozzles on a bottom face thereof, said cutters being in alignment with more of said valve member as a result of said non alignment of said axes as compared to said axes being aligned.    
   
   
       9 . The assembly of  claim 8 , wherein: 
 said valve member comprises at least one poppet or flapper.    
   
   
       10 . The assembly of  claim 8 , wherein: 
 said valve member comprises a flapper actuated by a flow tube.    
   
   
       11 . A method of inserting and removing a downhole tool, comprising: 
 running a tool to a desired position downhole;    supporting the tool so that its longitudinal axis is not aligned with the longitudinal axis of the surrounding tubular or the wellbore;    running a bit to the tool;    drilling up the tool.    
   
   
       12 . The method of  claim 11 , comprising: 
 making said axes parallel.    
   
   
       13 . The method of  claim 11 , comprising: 
 making said axes skewed.    
   
   
       14 . The method of  claim 13 , comprising: 
 making said axes intersect.    
   
   
       15 . The method of  claim 11 , comprising: 
 making the longitudinal axis in said tool coincide with a selectively closeable passage in said tool.    
   
   
       16 . The method of  claim 15 , comprising: 
 using a valve in a float shoe or collar as said tool.    
   
   
       17 . The method of  claim 15 , comprising: 
 using a flapper valve actuated by a flow tube in a float shoe or collar as said tool.    
   
   
       18 . The method of  claim 11 , comprising: 
 drilling more hole after drilling up the tool.    
   
   
       19 . The method of  claim 11 , comprising: 
 supporting said tool in cement.    
   
   
       20 . The method of  claim 11 , comprising: 
 using a packer as said tool.