Drill Collar       Drill Collar is mainly used to provide bit weight to drill bit so that drill pipe is in tension. Especially drill collar can keep drill bit centralized and hole track by large rigidity. TIANHE brand drill collars are manufactured strictly from API Spec7-1 and SY5411 standard. Technical specifications and parameters Drill Collar Number O.D. I.D. Length (mm) Bevel Diameter Ref bend g Strength ratio (mm) (in) (mm) (in) 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) 127.0 5 57.2 2 1/4 9150 121.0 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 150.0 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

Spiral Drill Collar is used to reduce contact area with hole so as to avoid efficiently bit sticking from differential pressure. TIANHE brand spiral drill collars are manufactured strictly according to API Spec7-1 and Standard SY5144. Technical specifications and parameters 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

Spiral Drill Collar With Elevator Groove And Slip Groove

Elevator groove and slip groove made on box thread face of slick drill collar or spiral drill collar can be used as lifting sub and safety slip when trip out. The technical parameters for elevator groove and slip groove is as per API spec7-1. Hard banding is optional at customers requests. Technical specifications and parameters Drill Collar ranges O.D. (mm) Elevator groove depth(mm) Elevator groove length(mm) Slip groove depth(mm) Slip groove length(mm) 101.6~117.5 5.6 406 4.8 457 120.6~142.9 6.4 406 4.8 457 146.0~168.3 7.9 406 6.4 457 171.4~219.1 9.5 406 6.4 457 >=222.2 11.1 406 6.4 457

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Drill Collar