Casing end tool

Abstract

A casing end tool has a mandrel and a body that is defined by a wall having an outer surface and an inner surface opposite of the outer surface. The body is fabricated from crystalline tungsten powder and a binder material. The inner surface includes a set of raised bosses or land structures. The body includes a plurality of blades on the outer surface. Each blade has a plurality of cutters. Blade channels and cutter channels on the blades enhance fragmentation of the body during drill out of the casing end tool.

1 . A casing bit, comprising:
 a mandrel; and   a bit body bonded to the mandrel, the bit body having an inner surface and an outer surface opposite the inner surface, the bit body consisting essentially of a matrix material of crystalline tungsten and a binder material.   
     
     
         2 . The casing bit of  claim 1  wherein the bit body includes at least one blade. 
     
     
         3 . The casing bit of  claim 2  wherein the blade includes at least one channel having a channel depth less than a thickness of the blade. 
     
     
         4 . The casing bit of  claim 3  wherein the at least one channel is a blade channel radially following the blade. 
     
     
         5 . The casing bit of  claim 3  wherein the blade includes a plurality of cutters, each cutter being bonded the blade. 
     
     
         6 . The casing bit of  claim 5  wherein each cutter is a polycrystalline diamond cutter. 
     
     
         7 . The casing bit of  claim 5  wherein each cutter comprises a diamond table mounted to a substrate of a first material. 
     
     
         8 . The casing bit of  claim 5  wherein the blade further includes a plurality of cutter channels, each cutter channel running circumferentially and having a depth less than the blade thickness. 
     
     
         9 . The casing bit of  claim 8  wherein the blade further comprises a plurality of cutter backup structures, and wherein one of the cutter channels is formed between adjacent ones of the cutter backup structures. 
     
     
         10 . The casing bit of  claim 8  further including a cap mounted to the substrate of the first material, wherein the cap at least partially overlies, but is not attached to, the diamond table. 
     
     
         11 . The casing bit of  claim 10  wherein the cap is made of or tipped with tungsten carbide. 
     
     
         12 . The casing bit of  claim 1  further including a plurality of blind openings formed in either the inner surface or the outer surface. 
     
     
         13 . The casing bit of  claim 1  wherein the binder material comprises brass. 
     
     
         14 . The casing bit of  claim 13  wherein the binder material comprises a nickel-brass alloy. 
     
     
         15 . The casing bit of  claim 1  wherein the inner surface includes a plurality of non-axisymmetric regions defined by raised portions of the inner surface. 
     
     
         16 . The casing bit of  claim 15  wherein the raised portions comprise a raised boss structure or a raised land structure. 
     
     
         17 . The casing bit of  claim 16  wherein the inner surface is configured such that during a drill out operation, drill out forces on the inner surface are first received by the raised boss structure or the raised land structure. 
     
     
         18 . A casing end tool, comprising:
 a tool body bonded to a mandrel, the tool body including a face portion having an inner surface, the face portion comprising a crystalline tungsten matrix material.   
     
     
         19 . The tool of  claim 18  wherein the tool body includes a plurality of blades. 
     
     
         20 . The tool of  claim 18  wherein the inner surface includes a plurality of non-axisymmetric regions defined by raised portions of the inner surface. 
     
     
         21 . The tool of  claim 20  wherein the raised portions comprise a raised boss structure or a raised land structure. 
     
     
         22 . The tool of  claim 21  wherein the inner surface is configured such that during a drill out operation, drill out forces on the inner surface are first received by the raised boss structure or the raised land structure. 
     
     
         23 . The tool of  claim 18  further including a plurality of blades, each blade supporting a plurality of cutter elements and further including at least one cutter channel having a depth less than a thickness of the blade. 
     
     
         24 . The tool of  claim 23  wherein one of the blades further comprises a plurality of cutter backup structures, and wherein the cutter channel is formed between adjacent ones of the cutter backup structures. 
     
     
         25 . The tool of  claim 18  wherein the tool is one of a casing bit or a casing reamer. 
     
     
         26 . A casing end tool, comprising:
 a body bonded to a mandrel, the body having a plurality of blades, each blade having at least one channel having a channel depth less than a thickness of the blade.   
     
     
         27 . The tool of  claim 26  wherein each blade supports a plurality of cutter elements, and the at least one channel running circumferentially along the blade. 
     
     
         28 . The tool of  claim 26  wherein the body includes an inner surface and an outer surface opposite the inner surface, the inner surface having a non-axisymmetric region being defined by a raised region of the inner surface. 
     
     
         29 . The tool of  claim 26  wherein the raised region comprises a raised boss or raised land structure. 
     
     
         30 . The tool of  claim 26  wherein the body further comprises:
 a wall defining an inner surface and an outer surface opposite the inner surface; and 
 a plurality of ports formed through the inner surface and the outer surface, each port having a surrounding thicker region of the wall interior to the bit body. 
 
     
     
         31 . The tool of  claim 30  further including a port sleeve for each port, the port sleeve extending above the surrounding thicker region. 
     
     
         32 . The tool of  claim 26  wherein the at least one channel is a blade channel radially following the blade. 
     
     
         33 . The tool of  claim 26  wherein the body includes a face portion formed of a crystalline tungsten matrix material.