Ream:

Often a rathole is reamed or opened to the same size as the main wellbore.

See rathole.

Terms Related to Ream

• Reamer

  A tool used in drilling to smooth the wall of a well, enlarge the hole to the specified size, help stabilize the bit, straighten the ...

• Rathole

  1. A hole in the rig floor, 30 to 35 feet (9 to 11 meters) deep, which is lined with casing that projects above the ...

• Underream

  To enlarge the wellbore below the casing.

• Riser pipe

  The pipe and special fittings used on floating offshore drilling rigs to establish a seal between the top of the wellbore, which is on the ...

• Air drilling

  A drilling technique whereby gases (typically compressed air or nitrogen) are used to cool the drill bit and lift cuttings out of the wellbore, instead of ...

• Mill

  A downhole tool with rough, sharp, extremely hard cutting surfaces for removing metal by grinding or cutting. Mills are run on drill pipe or tubing ...

• Hole opener

  A device used to enlarge the size of an existing borehole, having teeth arranged on its outside circumference to cut the formation as it rotates.