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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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