Drill Collar Specifications
| Drill Collar Number (1) |
Drill Collar Diameter |
Bore + 1-1/6" -0" |
Lenght |
Approximate Weight |
Selection Modulus |
Displacement (open ended) |
Typical Bending Strenght Ratio |
| |
In. |
In. |
ft. |
lb/ft. |
(in.3) |
US gal/ft. |
|
| NC 23-31 |
3-1/8 |
1-1/4 |
30 |
22.00 |
2.919 |
0.337 |
257:1 |
| NC 26-35 (2-3/8 IF) |
3-1/2 |
1-1/2 |
30 |
26.70 |
4.067 |
0.408 |
242:1 |
| NC 31-41 (2-7/8 IF) |
4-1/8 |
2 |
30 or 31 |
33.65 |
6.510 |
0.515 |
243:1 |
| NC 35-47 |
4-3/4 |
2 |
30 or 31 |
46.81 |
10.191 |
0.716 |
258:1 |
| NC38-50 (3-1/2 IF) |
5 |
2-1/4 |
30 or 31 |
53.29 |
11.769 |
0.815 |
238:1 |
| NC 44-60 |
6 |
2-1/4 |
30 or 31 |
82.61 |
20.786 |
1.264 |
249:1 |
| NC 44-60 |
6 |
2-13/16 |
30 or 31 |
75.90 |
20.182 |
1.161 |
284:1 |
| NC 44-62 |
6-1/4 |
2-1/4 |
30 or 31 |
90.52 |
23.566 |
1.385 |
291:1 |
| NC 46-62 (4 IF) |
6-1/4 |
2-1/316 |
30 or 31 |
83.81 |
22.986 |
1.282 |
263:1 |
| NC 46-65 (4 IF) |
6-1/2 |
2-1/4 |
30 or 31 |
99.52 |
99.52 |
1.522 |
276:1 |
| NC 46-65 (4 IF) |
6-1/2 |
2-1/316 |
30 or 31 |
92.81 |
92.81 |
1.420 |
305:1 |
| NC 46-67 (4 IF) |
6-3/4 |
2-1/4 |
30 or 31 |
108.52 |
108.52 |
1.600 |
318:1 |
| NC 50-70 (4-1-2 IF) |
7 |
2-1/4 |
30 or 31 |
117.52 |
117.52 |
1.798 |
254:1 |
| NC 50-70 (41-2 IF) |
7 |
2-1/316 |
30 or 31 |
110.77 |
110.77 |
1.694 |
273:1 |
| NC 50-72 (41-2 IF) |
7-1/4 |
2-1/316 |
30 or 31 |
119.81 |
119.81 |
1.833 |
312:1 |
| NC 56-77 |
7-3/4 |
2-1/316 |
30 or 31 |
139.90 |
139.90 |
2.140 |
270:1 |
| NC 56-80 |
8 |
2-1/316 |
30 or 31 |
150.81 |
150.81 |
2.307 |
302:1 |
| 6-5/8 API Reg |
8-1/4 |
2-1/316 |
30 or 31 |
161.81 |
161.81 |
2.472 |
293:1 |
| NC 61-90 |
9 |
2-1/316 |
30 or 31 |
195.81 |
217.00 |
2.295 |
317:1 |
| 7-5/8 API Reg |
9-1/2 |
3 |
30 or 31 |
217 |
230.00 |
3.319 |
281:1 |
| NC 70-97 |
9-3/4 |
3 |
30 or 31 |
230 |
90.179 |
3.518 |
257:1 |
| NC 70-100 |
10 |
3 |
30 or 31 |
242 |
97.380 |
3.717 |
281:1 |
| 8-5/8 API Reg |
11 |
3 |
30 or 31 |
299 |
129.948 |
4.574 |
284:1 |
|
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