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Drill Collar

Owetech drill collars are manufactured under strict conditions in order to meet API Spec7-1 and SY5411 standards. Our spiral drill collar is made from high quality steel with an IF surface heat treatment. The thread root of the drill collar and the concave base of the collar elevator are formed by a cold rolling technique. This process reduces the risk of crack formation and increases the bearing pressure of the upper radius. All screw threads undergo a phosphorization process or copper plating to increase corrosion resistance.

These drill string components are designed with grooves on the collar slip and elevator according to user requirements. The grooves add a level of safety during oil drilling operation in the absence of a lift joint and secure grip. The size and shape of the slip groove and elevator groove are consistent with API Spec 7-1 standards. We can also provide steel or plastic inner ring thread protectors according to user requirements.

Specification
Drill collar Number O.D. I.D. Length Bevel diameter Ref bend Strength Ratio
(mm) (in) (mm) (in) (mm)
NC23-31 79.4 3 1/8 31.8 1 1/2 9150 76.2 2.57:1
NC26-35(2 3/8 IF) 88.9 3 1/2 38.1 1 1/2 9150 82.9 2.42:1
NC31-41(2 7/8 IF) 104.8 4 1/8 50.8 2 9150 100.4 2.43:1
NC35-47 120.6 4 3/4 50.8 2 9150 114.7 2.58:1
NC38-50(3 1/2 IF) 127 5 57.2 2 1/4 9150 121 2.38:1
NC44-60 152.4 6 57.2 2 1/4 9150&9450 144.5 2.49:1
NC44-60 152.4 6 71.4 2 13/16 9150&9450 144.5 2.84:1
NC44-62 158.8 6 1/4 57.2 2 1/4 9150&9450 149.2 2.91:1
NC46-62(4IF) 158.8 6 1/4 71.4 2 13/16 9150&9450 150 2.63:1
NC46-65(4IF) 165.1 6 1/2 57.2 2 1/4 9150&9450 154.8 2.76:1
NC46-65(4IF) 165.1 6 1/2 71.4 2 13/16 9150&9450 154.8 3.05:1
NC46-67(4IF) 171.4 6 3/4 57.2 2 1/4 9150&9450 159.5 3.18:1
NC50-67(4 1/2 IF) 171.4 6 3/4 71.4 2 13/16 9150&9450 159.5 2.37:1
NC50-70(4 1/2 IF) 177.8 7 57.2 2 1/4 9150&9450 164.7 2.54:1
NC50-70(4 1/2 IF) 177.8 7 71.4 2 13/16 9150&9450 164.7 2.73:1
NC50-72(4 1/2 IF) 184.2 7 1/4 71.4 2 13/16 9150&9450 169.5 3.12:1
NC56-77 196.8 7 3/4 71.4 2 13/16 9150&9450 185.3 2.70:1
NC56-80 203.2 8 71.4 2 13/16 9150&9450 190.1 3.02:1
6 5/8 REG 209.6 8 1/4 71.4 2 13/16 9150&9450 195.7 2.93:1
NC61-90 228.6 9 71.4 2 13/16 9150&9450 212.6 3.17:1
7 5/8 REG 241.3 9 1/2 76.2 3 9150&9450 223.8 2.81:1
NC70-97 247.6 9 3/4 76.2 3 9150&9450 232.8 2.57:1
NC70-100 254 10 76.2 3 9150&9450 237.3 2.81:1
8 5/8 REG 279.4 11 76.2 3 9150&9450 266.7 2.84:1
Spiral drill collar
Specifications
O.D. Cutting depth Lead ±25.4
(mm) (in) A(mm) B(mm) (mm)
86 3 3/8 3.5±0.79   679
98.4 3 7/8 4.0±0.79   914
101.6 ~ 111.1 4 ~ 4 1/8 4.8±0.79   914
114.3 ~ 130.2 4 1/2 ~ 5 1/8 5.6±0.79   965
133.4 ~ 146.1 5 1/4 ~ 5 3/4 6.4±0.79   1067
149.2 ~ 161.9 5 7/8 ~ 6 3/8 7.1±1.59   1067
165.1 ~ 177.8 6 1/2 ~ 7 7.9±1.59   1168
181.0 ~ 200.0 7 1/8 ~ 7 7/8 8.7±1.59 5.6±0.79 1626
203.2 ~ 225.4 8 ~ 8 7/8 9.5±1.59 6.4±0.79 1727
228.6 ~ 250.8 9 ~ 9 7/8 10.3±2.37 7.1±1.59 1829
254.0 ~ 276.2 10 ~ 10 7/8 11.1±2.37 7.9±1.59 1930
279.4 11 11.9±2.37 8.7±1.59 2032

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