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
Drill Collar Number	(mm)	(in)	(mm)	(in)	Length (mm)	Bevel Diameter	Ref bend g Strength ratio
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

http://cid-48f2f7c30e8ef3dd.office.live.com/browse.aspx/Technical

Drill Collar

Product Description

Drill Collar

Spiral Drill Collar

Spiral Drill Collar With Elevator Groove And Slip Groove

Product Image