Reaming system, device, and assembly

Abstract

A reaming assembly having an inner mandrel including spiral lobes disposed on an outer surface thereof. The inner mandrel is hollow and is sized large enough to freely pass a standard drill bit therethrough. The reaming assembly includes an outer mandrel disposed around the inner mandrel and includes spiral lobes disposed on an inner surface of the outer mandrel. The outer mandrel has a number of spiral lobes equal to the number of spiral lobes of the inner mandrel plus one. The reaming assembly includes a spacing between the outer surface of the inner mandrel and the inner surface of the outer mandrel through which fluid is pumped to generate torque therebetween; wherein at least one of the inner and outer mandrel is free to rotate.

What is claimed is: 
     
         1 . A reaming power assembly, comprising:
 a) an inner mandrel having spiral lobes disposed on an outer surface thereof;   b) an outer mandrel disposed around the inner mandrel and having spiral lobes disposed on an inner surface of the outer mandrel; and   c) a spacing between the outer surface of the inner mandrel and the inner surface of the outer mandrel through which fluid may be pumped to generate torque therebetween; wherein at least one of the inner and outer mandrel is free to rotate.   
     
     
         2 . The assembly of  claim 1 , wherein the outer mandrel has a number of spiral lobes equal to the number of spiral lobes of the inner mandrel plus one. 
     
     
         3 . The assembly of  claim 1 , wherein one of the inner and outer mandrel is non-rotatably coupled to an end of a casing and the other is non-rotatably coupled to a bit or shoe. 
     
     
         4 . The assembly of  claim 1 , further comprising an upper flow diverter that diverts fluid flow from a center region of the reaming assembly to the spacing between the inner and outer mandrels. 
     
     
         5 . The assembly of  claim 1 , further comprising a lower flow diverter that diverts fluid flow from the spacing between the inner and outer mandrels to a center region of the reaming assembly. 
     
     
         6 . The assembly of  claim 1 , wherein the inner mandrel is hollow. 
     
     
         7 . The assembly of  claim 6 , wherein the hollow of the inner mandrel is sized large enough to freely pass a standard drill bit therethrough. 
     
     
         8 . The assembly of  claim 1 , further comprising upper and lower bearing assemblies rotatably coupled between the inner and outer mandrels. 
     
     
         9 . The assembly of  claim 1 , further comprising:
 a) an elongated tubular housing, including:
 a1) a first end having a fluid inlet aperture; 
 a2) a second end, opposite the first end, having a fluid outlet aperture; and 
 a3) a coupling structure at the first end of the housing that selectably mates with a bottom end of a casing tube. 
   
     
     
         10 . The assembly of  claim 9 , further comprising a reaming tool functionally coupled to an end of the assembly such that torque therefrom may be used to rotate the reaming tool. 
     
     
         11 . The assembly of  claim 9 , further comprising a casing tube coupled to the housing. 
     
     
         12 . A reaming device, comprising:
 a) a hollow inner mandrel having spiral lobes disposed on an outer surface thereof;   b) an outer mandrel disposed around the inner mandrel and having spiral lobes disposed on an inner surface of the outer mandrel; and   c) a spacing between the outer surface of the inner mandrel and the inner surface of the outer mandrel through which fluid may be pumped to generate torque therebetween; wherein at least one of the inner and outer mandrel is free to rotate; wherein the outer mandrel has a number of spiral lobes equal to the number of spiral lobes of the inner mandrel plus one.   
     
     
         13 . The device of  claim 12 , wherein one of the inner and outer mandrel is non-rotatably coupled to an end of a casing and the other is non-rotatably coupled to a bit or shoe. 
     
     
         14 . The device of  claim 13 , further comprising an upper flow diverter that diverts fluid flow from a center region of the reaming assembly to the spacing between the inner and outer mandrels. 
     
     
         15 . The device of  claim 14 , further comprising a lower flow diverter that diverts fluid flow from the spacing between the inner and outer mandrels to a center region of the reaming assembly. 
     
     
         16 . The device of  claim 15 , wherein the hollow of the inner mandrel is sized large enough to freely pass a standard drill bit therethrough. 
     
     
         17 . The device of  claim 16 , further comprising upper and lower bearing assemblies rotatably coupled between the inner and outer mandrels. 
     
     
         18 . The device of  claim 17 , further comprising:
 a) an elongated tubular housing, including:
 a1) a first end having a fluid inlet aperture; 
 a2) a second end, opposite the first end, having a fluid outlet aperture; and 
 a3) a coupling structure at the first end of the housing that selectably mates with a bottom end of a casing tube; 
   b) a first bearing pack disposed circumferentially about the first end of the housing; and   c) a reaming tool functionally coupled to the auger.   
     
     
         19 . The device of  claim 18 , further comprising a casing tube coupled to the housing 
     
     
         20 . A reaming system, comprising:
 a) an inner mandrel having spiral lobes disposed on an outer surface thereof; wherein the inner mandrel is hollow; wherein the hollow of the inner mandrel is sized large enough to freely pass a standard drill bit therethrough;   b) an outer mandrel disposed around the inner mandrel and having spiral lobes disposed on an inner surface of the outer mandrel;   c) a spacing between the outer surface of the inner mandrel and the inner surface of the outer mandrel through which fluid may be pumped to generate torque therebetween; wherein at least one of the inner and outer mandrel is free to rotate; wherein the outer mandrel has a number of spiral lobes equal to the number of spiral lobes of the inner mandrel plus one; wherein one of the inner and outer mandrel is non-rotatably coupled to an end of a casing and the other is non-rotatably coupled to a bit or shoe;   d) an upper flow diverter that diverts fluid flow from a center region of the reaming assembly to the spacing between the inner and outer mandrels;   e) a lower flow diverter that diverts fluid flow from the spacing between the inner and outer mandrels to a center region of the reaming assembly;   f) an upper and lower bearing assemblies rotatably coupled between the inner and outer mandrels;   g) an elongated tubular housing, including:
 g1) a first end having a fluid inlet aperture; 
 g2) a second end, opposite the first end, having a fluid outlet aperture; and 
 g3) a coupling structure at the first end of the housing that selectably mates with a bottom end of a casing tube; 
   h) a first bearing pack disposed circumferentially about the first end of the housing;   i) a reaming tool functionally coupled to the inner mandrel or outer mandrel such that torque therefrom rotates the reaming tool; and   j) a casing tube coupled to the housing.