Specifications

8" spiral drill collar:
1.Meeting to API7-1
2.OD:4 1/8"-11"
3.Length:5"-31"

8" spiral drill collar

1.Meeting to API7-1

2.OD:4 1/8"-11"

3.Length:5"-31"

4. Drill collars are made of ANSI4137 ,4145H,4145HM alloy steel.

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

 

O.D.		I.D.		Connections
inch	mm	inch	mm
4 1/8	104.78	2	50.80	NC31,NC35
4 3/4	120.65	2	50.80	NC35, NC38(3 1/2IF)
6 1/4	158.75	2 1/4 2 13/16	57.15 71.44	NC44, 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	71.44	NC56
9	228.6	2 13/16	71.44	NC61
9 1/2	241.3	3	76.20	7 5/8REG
10	254	3	76.20	NC70
11	279.4	3	76.20	8 5/8REG

 

 

 

        non-magnetic drill collar                                      spiral drill collar