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Drill Collar
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Model: Drill Collar
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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 NumberO.D.I.D.Length
(mm)		Bevel DiameterRef bend g Strength ratio
(mm)(in)(mm)(in)
NC23-3179.43 1/831.81 1/2915076.22.57:1
NC26-35(2 3/8 IF)88.93 1/238.11 1/2915082.92.42:1
NC31-41(2 7/8 IF)104.84 1/850.829150100.42.43:1
NC35-47120.64 3/450.829150114.72.58:1
NC38-50(3 1/2 IF)127.0557.22 1/49150121.02.38:1
NC44-60152.4657.22 1/49150 & 9450144.52.49:1
NC44-60152.4671.42 13/169150 & 9450144.52.84:1
NC44-62158.86 1/457.22 1/49150 & 9450149.22.91:1
NC46-62(4IF)158.86 1/471.42 13/169150 & 9450150.02.63:1
NC46-65(4IF)165.16 1/257.22 1/49150 & 9450154.82.76:1
NC46-65(4IF)165.16 1/271.42 13/169150 & 9450154.83.05:1
NC46-67(4IF)171.46 3/457.22 1/49150 & 9450159.53.18:1
NC50-67(4 1/2 IF)171.46 3/471.42 13/169150 & 9450159.52.37:1
NC50-70(4 1/2 IF)177.8757.22 1/49150 & 9450164.72.54:1
NC50-70(4 1/2 IF)177.8771.42 13/169150 & 9450164.72.73:1
NC50-72(4 1/2 IF)184.27 1/471.42 13/169150 & 9450169.53.12:1
NC56-77196.87 3/471.42 13/169150 & 9450185.32.70:1
NC56-80203.2871.42 13/169150 & 9450190.13.02:1
6 5/8 REG209.68 1/471.42 13/169150 & 9450195.72.93:1
NC61-90228.6971.42 13/169150 & 9450212.63.17:1
7 5/8 REG241.39 1/276.239150 & 9450223.82.81:1
NC70-97247.69 3/476.239150 & 9450232.82.57:1
NC70-1002541076.239150 & 9450237.32.81:1
8 5/8 REG279.41176.239150 & 9450266.72.84:1
 

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 depthLead +- 25.4
(mm)(in)A(mm)B(mm)(mm)
863 3/83.5 +- 0.79 679
98.43 7/84.0 +- 0.79 914
101.6~111.14~4 1/84.8 +- 0.79 914
114.3~130.24 1/2~5 1/85.6 +- 0.79 965
133.4~146.15 1/4~5 3/46.4 +- 0.79 1067
149.2~161.95 7/8~6 3/87.1 +- 1.59 1067
165.1~177.86 1/2~77.9 +- 1.59 1168
181.0~200.07 1/8~7 7/88.7 +- 1.595.6 +- 0.791626
203.2~225.48~8 7/89.5 +- 1.596.4 +- 0.791727
228.6~250.89~9 7/810.3 +- 2.377.1 +- 1.591829
254.0~276.210~10 7/811.1 +- 2.377.9 +- 1.591930
279.41111.9 +- 2.378.7 +- 1.592032

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)
101.6~117.55.64064.8457
120.6~142.96.44064.8457
146.0~168.37.94066.4457
171.4~219.19.54066.4457
>=222.211.14066.4457
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Drill Collar
 
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Drill Collar
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