Specifications

drill collar:
1.standard:API7-1
2.OD:3 1/8"-11"
3.Length:5"-31"

drill collar

 

1.Meeting to API7-1

2.OD:3 1/8",3 1/2",4 1/8",4 3/4",5",6",,6 1/4',6 1/2",6 3/4",7",7 1/4",7 3/4",8",8 1/4",9",10",11"

3.Length:5"-31"

4.Type: slick drill collar,spiral drill collar,spiral drill collar with elevator groove and slip groove and non-magnetic drill collar

5.Material:ANSI4137 ,4145H,4145HM alloy steel.

 

The Main Technical Specification of Drill Collar
O.D.		I.D.		Connections
inch	mm	inch	mm
4-1/8	104.78	2 2-1/4	50.80 57.15	NC31,NC35 NC35
4-3/4	120.65	2 2-1/4	50.80 57.15	NC35, NC35,NC38(3 1/2IF)
6-1/4	158.75	2-1/4 2-13/16	57.15 71.44	NC46(4IF) NC46(4IF)
6-1/2	165.1	2-1/4 2-13/16	57.15 71.44	NC46(4IF) NC46(4IF)
7	177.8	2-1/4 2-13/16	57.15 71.44	NC50(4 1/2IF) NC50(4 1/2IF)
8	203.2	2-13/16 3	71.44 76.20	6 5/8REG 6 5/8REG
9	228.6	2-13/16 3	71.44 76.20	7 5/8REG 7 5/8REG
9-1/2	241.3	3	76.20	7 5/8REG
10	254	3	76.20	NC70
11	275.4	3	76.20	NC77

 

   

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