30-50 Overview
D20x22 Series II Navigator HDD
Rod Wrap and R.A.T.T. Oscillation
As drilling distance increases, drill string windup increases with the longer drill
string. The result is rod wrap and the drill head rotates fewer degrees than the drive
chuck.
To maintain the drill head rotation angle when steering with a long drill string, the
drive chuck rotation angle must be increased to compensate for rod wrap. Failure to
increase drive chuck rotation angle as the bore length increases may result in
decreased productivity and eventual stoppage.
Rod wrap will vary based on drilling conditions and drill pipe diameters. Adjust
rotation angle with
Increase/Decrease Keys
(1)
as needed to compensate for rod
wrap.
1
Содержание D20x22 Series II
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