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Core Barrel Designation | Reaming Shell | |||
Set Diameter | ||||
Maximum | Minimum | |||
Inches | mm | Inches | mm | |
BQ | 2.365 | 60.07 | 2.355 | 59.82 |
AQ | 1.895 | 48.13 | 1.885 | 47.88 |
PQ | 4.835 | 120.81 | 4.82 | 122.43 |
HQ | 3.79 | 96.27 | 3.775 | 95.89 |
NQ | 2.985 | 75.82 | 2.975 | 75.57 |
Diamond Reaming Shells are important tools to be used together with bits.Its main functions are maintaining borehole gage,improving drill string stability and protecting lower drill string from excessive wear. Helical type reaming shell provides a good passage for drilling fluids.The matrix is wearproof,and its service life is long.
international standard reaming shell