Drill Collar Slips A Series

The drill collar, as a component of the drill string, is an extremely industrialized tubular structure used to drill underground and provide the weight of the drill bit for drilling. It is used in combination with drill pipes. There are mainly smooth and spiral groove types. Our manufacturing process has passed API  specification 7-1 certification. The drill collar is made of AISI 4145 H or 4145 H modified alloy steel. Drill holes from one direction without any mismatches. All drill collars have undergone heat treatment, with a hardness between 285 and 341 BHN, ensuring a depth of one inch below the surface of the pipeline.

Non magnetic drill collars provide strength and hardness, while preventing magnetic interference that may damage the accuracy of magnetic measurements. It is made of special steel materials, with low permeability, high mechanical properties, and excellent corrosion cracking resistance.

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We provide smooth drill collars, spiral drill collars, and non-magnetic drill collars; Their sizes range from 3-1/8 to 11 inches. In addition to the drill collars listed in the table below, we can also provide other drill collars according to customer requirements.

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project	name	Spiral or smooth	external diameter	identity	Identification tool connectionl		Diagonal diameter in	material	overall length
			exist	exist	connect				foot
1	Drill collar	Slick or Spiral	3.1/8	1.1/4	NC26	2.3/8“	3	4145H	30 or 31
2	Drill collar	Slick or Spiral	3.1/2	1.1/2	NC26	2.3/8“		4145H	30 or 31
3	Drill collar	Slick or Spiral	4.1/8	2	NC31-41	2.7/8“	3.61/64	4145H	30 / 31
4	Drill collar	Slick or Spiral	4.3/4	2	NC35-47		4.33/64	4145H	30 /31
5	Drill collar	Slick or Spiral	5	2.1/4	NC38-50	3.1/2“	4.49/64	4145H	30 or 31
6	Drill collar	Slick or Spiral	6	2.1/4	NC44-60		5.11/16	4145H	30 or 31
7	Drill collar	Slick or Spiral	6	2.13/16	NC44-60		5.11/16	4145H	30 or 31
8	Drill collar	Slick or Spiral	6.1/4	2.1/4	NC44-62		5.7/8	4145H	30 or 31
9	Drill collar	Slick or Spiral	6.1/4	2.13/16	NC46-62	4“	5.29/32	4145H	30 or 31
10	Drill collar	Slick or Spiral	6.1/2	2.1/4	NC46-65	4“	6.3/32	4145H	30 or 31
11	Drill collar	Slick or Spiral	6.1/2	2.13/16	NC46-65	4“	6.3/32	4145H	30 or 31
12	Drill collar	Slick or Spiral	6.3/4	2.1/4	NC46-67	4“	6.9/32	4145H	30 or 31
13	Drill collar	Slick or Spiral	7	2.1/4	NC50-70	4.1/2“	6.31/64	4145H	30 or 31
14	Drill collar	Slick or Spiral	7	2.13/16	NC50-70	4.1/2“	6.31/64	4145H	30 or 31
15	Drill collar	Slick or Spiral	7.1/4	2.13/16	NC50-72	4.1/2“	6.43/64	4145H	30 or 31
16	Drill collar	Slick or Spiral	7.3/4	2.13/16	NC56-77		7.19/64	4145H	30 or 31
17	Drill collar	Slick or Spiral	8	2.13/16	NC56-80		7.31/64	4145H	30 or 31
18	Drill collar	Slick or Spiral	8.1/4	2.13/16	6.5/8″REG		7.45/64	4145H	30 or 31
19	Drill collar	Slick or Spiral	9	2.13/16	NC61-90		8.3/8	4145H	30 or 31
20	Drill collar	Slick or Spiral	9.1/2	3	7.5/8″REG		8.13/16	4145H	30 or 31
21	Drill collar	Slick or Spiral	9.3/4	3	NC70-97		9.5/32	4145H	30 or 31
22	Drill collar	Slick or Spiral	10	3	NC70-100		9.11/32	4145H	30 or 31
23	Drill collar	Slick or Spiral	11	3	8.5/8″REG		10.1/2	4145H	30 or 31
Note:	If the cliente has any special requerimente, for example compound,cold rolling,make and break,hard banding (ARNCO 100XT ARNCO 300XT etc), internal coating (TK34 TK34PTC2000, etc),Stress- Relief Pin, Bored  Back Box,Elevator Recess, slip Recess please feel free to contact us. Stainless Steel Pipe

 

Non-Magetic Drill Collar
Grade	Minimum Tensile Strength
	psi	Mpa
1	90000	621
2	9000	621
3	115000	793
**Non-magetic drill collar can be customized as per customer’s design. The size please refer to the sizes of drill collar.

 

Spiral Drill Collar
OD (in)	4 3/4	6 1/4	6 3/4	7 1/4	7 1/2	8	9 1/2	10	11
Depth of Cut (in)	7/32 ±1/32	9/32 ±1/16	5/16 ±1/16	11/32 ±1/16	11/32 ±1/16	3/8 ±1/16	13/32 ±3/32	7/16 ±3/32	15/32 ±3/32
Spiral Pitch (in)	38 ±1	42 ±1	46 ±1	64 ±1	64 ±1	68 ±1	72 ±1	76 ±1	80 ±1
** Drill collar can be customized as per customer’s design.

Drill collars are an integral heavy duty joint that are constructed from a solid bar of AISI 4145H modified alloy steel.? Our standard drill collars are supplied with an “as rolled” surface finish condition.? All standard bars receive heat-treatment that provides them with the necessary mechanical properties.
The bars are then trepanned and drifted.? All of our drill collars are manufactured in accordance with API spec 7, Q1 and recommended practice 7G, as applicable. astm a519 steel pipe ASTM A213 

Standard Sizes, Bores, and Connections

Drill Collar Conn. Size & Type	Min. OD	Bore	Length	Bending Strength Ratio***	Drill Collar Wt.
	(in.)	(in.)	(ft.)		(lb.)
NC 26 (2-3/8 IF)	3-1/2	1-1/2	30	2.42:1	801
NC 31 (2-7/8 IF)	4-1/8	2	30	2.43:1	1041
NC 38 (3-1/2 IF)	4-3/4	2-1/4	31	1.85:1	1451
NC 38 (3-1/2 IF)	5	2-1/4	31	2.38:1	1652
NC 44	6	2-1/4	31	2.49:1	2561
NC 44	6	2-13/16	31	2.84:1	2353
NC 44	6-1/4	2-1/4	31	2.91:1	2806
NC 46 (4 IF)	6-1/4	2-13/16	31	2.63:1	2598
NC 46 (4 IF)	6-1/2	2-1/4	31	2.76:1	3085
NC 46 (4 IF)	6-1/2	2-13/16	31	3.05:1	2877
NC 46 (4 IF)	6-3/4	2-1/4	31	3.18:1	3364
NC 50 (4-1/2 IF)	7	2-1/4	31	2.54:1	3643
NC 50 (4-1/2 IF)	7	2-13/16	31	2.73:1	3434
NC 50 (4-1/2 IF)	7-1/4	2-13/16	31	3.12:1	3714
NC 56	8	2-13/16	31	3.02:1	4675
6-5/8 REG.	8	2-13/16	31	2.60:1	4675
6-5/8 REG.	8-1/4	2-13/16	31	2.93:1	5016
7-5/8 REG.	9-1/2	3	31	2.81:1	6727
7-5/8 REG.**	9-3/4	3	31	3.09:1	7130
8-5/8 REG.**	11	3	30	2.78:1	8970
** Low torque face *** Ratio of box to pin section modulus – See API RP7G for details Note: Other sizes and connections are available as well as any other optional features listed

 

Mechanical Property
TTT		Yield strength 0.2Mpa	Tensile strength b Mpa	Elongation 4%	Hardness(Brinell)	IMPACT VALUE(CHAPPY-V)
mm	in inch
79.4-171.4	3 1/8-6 3/4	≥ 758	≥ 965	≥ 13	285-341	≥ 54
177.8-279.4	7-11	≥ 689

Drill collar and drill pipe accessories

Product Categories : OCTG Products > Tubing