The reamer reamer is also called the expander squint drill. It is a tool used for reaming while drilling in oil wells.
It is different from the reaming drill installed in the lower part of the drill string, but is mounted in the middle of the drill string and has a diameter slightly larger than the drill diameter. When the drill bit is drilled in, the upper reamer simultaneously reams and trims the well wall.
Reamers are generally used for drilling formations that are inclined and easily reduced in diameter. In the case of drilling with a diamond drill bit, in order to prevent the diameter of the drill bit from shrinking and to ensure that the new drill bit can smoothly enter the bottom of the well, two to three diamond reamer must be installed at intervals in the drill string.
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