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DRILL COLLAR SPECIFICATIONS
DRILL COLLAR NUMBER (1) DRILL COLLAR DIAMETER BORE + 1/16" -0" LENGTH APPROXIMATE WEIGHT OF 31 FT DRILL COLLAR TYPICAL BENDING STRENGTH RATION
IN MM IN MM FT M LB KG
NC 23-31 3,125 79,375 1 1/4 31,75 30 91,44 660 299,376 2.57:1
NC 26-35 (2 3/8 IF) 3,5 88,9 1 1/2 38,1 30 91,44 801 363,3336 2.42:1
NC 31-41 (2 7/8 IF) 4,125 104,775 2 50,8 30-31 91.44 - 94.48 1043 473,1048 2.43:1
NC 35-47 4,75 120,65 2 50,8 30-31 91.44 - 94.48 1451 658,1736 2.58:1
NC 38-50 (3 1/2 IF) 5 127 2 1/4 57,15 30-31 91.44 - 94.48 1652 749,3472 2.38:1
NC 44-60 6 152,4 2 1/4 57,15 30-31 91.44 - 94.48 2561 1161,6696 2.49:1
NC 44-60 6 152,4 2 13/16 71,4375 30-31 91.44 - 94.48 2353 1067,3208 2.84:1
NC 44-62 6,25 158,75 2 1/4 57,15 30-31 91.44 - 94.48 2806 1272,8016 2.91:1
NC 46-62 (4 IF) 6,25 158,75 2 13/16 71,4375 30-31 91.44 - 94.48 2598 1178,4528 2.63:1
NC 46-65 (4 IF ) 6,5 165,1 2 1/4 57,15 30-31 91.44 - 94.48 3085 1399,356 2.76:1
NC 46-65 (4 IF ) 6,5 165,1 2 13/16 71,4375 30-31 91.44 - 94.48 2877 1305,0072 3.05:1
NC 46-67 ( 4IF ) 6,75 171,45 2 1/4 57,15 30-31 91.44 - 94.48 3364 1525,9104 3.18:1
NC 50-70 (4 1/2 IF) 7 177,8 2 1/4 57,15 30-31 91.44 - 94.48 3643 1652,4648 2.54:1
NC 50-70 (4 1/2 IF) 7 177,8 2 13/16 71,4375 30-31 91.44 - 94.48 3434 1557,6624 2.73:1
NC 50-72 (4 1/2 IF) 7,25 184,15 2 13/16 71,4375 30-31 91.44 - 94.48 3714 1684,6704 3.12:1
NC 56-77 7,75 196,85 2 13/16 71,4375 30-31 91.44 - 94.48 4337 1967,2632 2.70:1
NC 56-80 8 203,2 2 13/16 71,4375 30-31 91.44 - 94.48 4675 2120,58 3.02:1
6 5/8 API Reg 8,25 209,55 2 13/16 71,4375 30-31 91.44 - 94.48 5016 2275,2576 2.93:1
NC 61-90 9 228,6 2 13/16 71,4375 30-31 91.44 - 94.48 6070 2753,352 3.17:1
7 5/8 API Reg 9,5 241,3 3 76,2 30-31 91.44 - 94.48 6727 3051,3672 2.81:1
NC 70-97 9,75 247,65 3 76,2 30-31 91.44 - 94.48 7130 3234,168 2.57:1
NC 70-100 10 254 3 76,2 30-31 91.44 - 94.48 7532 3416,5152 2.81:1
8 5/8 API Reg 11 279,4 3 76,2 30-31 91.44 - 94.48 9269 4204,4184 2.84:1


SLIP AND ELEVATOR RECESS
DRILL COLLAR DIAMETER ELEVATOR RECESS DIAMETER SLIP RECESS DIAMETER ELEVATOR RECESS RADIOUS
IN MM IN MM IN MM IN MM
4,125 104,775 3,6875 93,6625 3,75 95,25 0,125 3,175
4,75 120,65 3,25 82,55 4,375 111,125 0,125 3,175
5 127 4,5 114,3 4,63 117,602 0,125 3,175
6 152,4 5,375 136,525 5,5 139,7 0,125 3,175
6,25 158,75 5,625 142,875 5,75 146,05 0,125 3,175
6,5 165,1 5,875 149,225 6 152,4 0,125 3,175
6,75 171,45 6 152,4 6,25 158,75 3/16 4,76
7 177,8 6,25 158,75 6,5 165,1 3/16 4,76
7,25 184,15 6,5 165,1 6,75 171,45 3/16 4,76
7,75 196,85 7 177,8 7,25 184,15 3/16 4,76
8 203,2 7,25 184,15 7,5 190,5 3/16 4,76
8,25 209,55 7,5 190,5 7,75 196,85 3/16 4,76
9 228,6 8,125 206,375 8,5 215,9 0,25 6,35
9,5 241,3 8,625 219,075 9 228,6 0,25 6,35
9,75 247,65 8,875 225,425 9,25 234,95 0,25 6,35
10 254 9,125 231,775 9,5 241,3 0,25 6,35
11 279,4 10,125 257,175 10,5 266,7 0,25 6,35