Spiral Drill Collars
a. Drill Collar Groove
For Elevator And Slip (As Per API-7G)
It is possible to add elevator and slip recess to our Drill Collar. These recesses allow one to dispense with lift subs and safety clamps and to attain savings in operating time. Recommended Slip & Elevator recess dimensions are given below:
b. Spiral Drill Collars
Minimize the potential for differential sticking with our Spiral Drill Collars. They reduce the amount of contact between the drill collar and the wall of hole.
| O. D. Range | A | R | C | B | D |
| 4 ~ 4.5/8 | 7/32 | 1/8 | 5 degree | 3/16 | 3.1/2 degree |
| 4.3/4 ~ 5.5/8 | 1/4 | 1/8 | 5 degree | 3/16 | 3.1/2degree |
| 5.3/4 ~ 6.5/8 | 5/16 | 1/8 | 6 degree | 1/4 |
5 degree |
| 6.3/4 ~ 8.5/8 | 3/8 | 3/16 | 7.1/2 degree | 1/4 | 5 degree |
| 8.3/4 & Large | 7/16 | 1/4 | 9 degree | 1/4 | 5 degree |
A - ELIVATOR GROOVE
B - SLIP GROOVE
| O. D. Range | Depth of Cut | Spirals | Pitch / Direction Rh |
| 4.2/2 ~ 5.1/8 | 7 / 32_+1/32 | 3 | 38_+1 |
| 5.1/4 ~ 5.3/4 | 1 / 4_+1/32 | 3 | 42_+1 |
| 5.7/8 ~ 6.3/8 | 9 / 32_+1/6 | 3 | 42_+1 |
| 6.1/2 ~ 6.7/8 | 5 / 16_+1/6 | 3 | 46_+1 |
| 7 | 5 / 16_+1/6 | 3 | 64_+1 |
| 7.1/8 ~ 7.7/8 | 11 / 32_+1/16 | 3 | 64_+1 |
| 8 ~ 8.7/8 | 3/ 8_+1/16 | 3 | 68_+1 |
| 9 ~ 9.7/8 | 13 / 32_+3/32 | 3 | 72_+1 |
| 10 ~ 10.7/8 | 7 / 16_+3/32 | 3 | 76_+1 |
| 11 ~ 12 | 15 / 32_+3/32 | 3 | 80_+1 |
