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Drill Collar

  • Keywords: Drill Collar, Spiral Drill Collar, Non-Magnetic Drill Collar, Steel Drill Collar
  • Standard: API SPEC 7-1
  • Steel Grade: AISI 4145H
  • Sizes: 3 1/8" -- 11"
  • Connected Type: NC, IF, REG
  • Length: 30 – 31 ft ± 6 ft.
  • Type of Design: (1) Plain; (2) With A Recess of the Elevator; (3) With A Recess of the Elevator and Power Slips; (4) Spiral and A Wide Range of Type Mixtures.
Availability:
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Description of Drill Collar


Drill collars are extra-heavy integral tools used to concentrate weight onto the drill bit so as to produce sufficient force for the drill bit to break rock efficiently while drilling. They are made of AISI 4145H modified steel and are connected between drill pipes and drill bits.



Drill collars come in 30 or 31-foot lengths and are furnished as slick (as-rolled surface finish) or spiraled. Spiraled drill collars have grooves on their external surface, which maintain an even flow of drilling fluid around the collar to equalize pressure and reduce differential-sticking of the collar to the wall of the oilwell.


Our drill collar connections comply with the dimensional requirements specified in API Spec. 7/7-1 and guidelines presented in API RP7G. Drill collars also come with slip and elevator recesses for safe and efficient handling. Slip and elevator recesses can be used together or separately and are machined in compliance with API RP7G guidelines unless otherwise specified.



NON-MAGNETIC DRILL COLLARS


TECHNICAL SUMMARY

As you drill in areas closer to the Earth's magnetic poles, it is essential to use a non-magnetic drill collar. Our non-magnetic drill collars offer strength and hardness while neutralizing magnetic interference. Compatible with standard drill string tools and stabilizers, our non-magnetic drill collars are manufactured to API Spec 7-1. Inventory includes:

(1) Slick

(2) Flex

(3) Spiral

(4) Pony


We treat our non-magnetic material ID with a shot peening operation to compress the inside diameter, which prevents stress corrosion while drilling in H2S environments.


Resistant to stress corrosion in sour gas environments


Compatible with standard drill string tools and stabilizers


Spiraling available on request


Used to add weight to the bit and stiffness to the bottom hole assembly, our Drill Collars are an invaluable downhole tool.



STEEL DRILL COLLARS

To keep you drilling in the right direction, run our Drill Collars in combination with our Stabilizers to resist bucking. Manufactured from an AISI 4145H modified heat-treated alloy steel, our strict quality assurance guidelines assure the metallurgical integrity of every bar.


Our Drill Collar bars are batch or continuous line heat-treated and have both cold-worked and phosphate-coated connections.


Specification of Drill Collars:


NON-MAGNETIC DRILL COLLARS

Common Connections

OD (in)

ID (in)

Approx Weight (lbs)

2 7/8 REG

3 1/2 to 3 7/8

1 1/4 to 1 3/4

760-1114

3 1/2 REG

4 1/8 to 4 1/2

1 1/4 to 2 1/4

989-1490

3 1/2 IF NC38

4 3/4 to 5 1/2

1 3/4 to 2 13/16

1350-2250

4 FH NC40

5 to 6

1 3/4 to 2 13/16

1552-2726

4 1/2 FH

5 1/2 to 6 1/2

2 to 3

1759-3166

4 1/2 XH NC46

5 3/4 to 6 3/4

2 1/4 to 3

1992-3352

4 1/2 IF NC50

6 1/4 to 7 1/2

2 1/4 to 3 1/4

2359-4237

5 1/2 FH NC56

7 to 7 3/4

2 1/4 to 3 1/4

3182-4552

6 5/8 REG

7 1/4 to 8

2 1/2 to 3 1/4

3476-4780

6 5/8 FH

7 1/2 to 8 1/4

2 1/2 to 3 1/4

3782-5116

7 5/8 REG

8 1/2 to 9 1/2

2 1/2 to 3 3/4

4816-6953


STEEL DRILL COLLARS

O.D. (in)

I.D. (in)

Weight in Air (lbs)

Unit Weight (lbs/ft)

Standard End Connections

3 1/2

1 1/2

826.8

26.7

NC-26 thru 35

4 1/8

2

1076.2

34

NC-31 thru 41

4 3/4

2 1/4

1447.0

46.7

NC-38 thru 47

5

2 1/4

1648.5

53.2

NC-38 thru 50

6

2 1/4

2558.0

82.5

NC-44 thru 60

6

2 13/16

2322.3

74.9

NC-44 thru 60

6 1/4

2 1/4

2811.2

90.7

NC-44 thru 62

6 1/4

2 13/16

2575.6

83.1

NC-46 thru 65

6 1/2

2 1/4

3074.8

99.2

NC-46 thru 65

6 1/2

2 13/16

2839.1

91.6

NC-46 thru 65

6 3/4

2 1/4

3348.7

108.0

NC-46 thru 67

7

2 1/4

3632.9

117.2

NC-50 thru 70

7

2 13/16

3397.2

109.6

NC-50 thru 70

7 1/4

2 13/16

3691.8

119.1

NC-50 thru 72

8

2 13/16

4637.5

149.6

6 5/8 Regular

8 1/4

2 13/16

4973.4

160.4

6 5/8 Regular

9 1/2*

3

6718.0

216.7

7 5/8 Regular

9 3/4*

3

7116.0

229.5

7 5/8 Regular

11*

3

9260.6

298.7

8 5/8 Regular


RECOMMENDED SLIP AND ELEVATOR RECESS DIAMETERS FOR DRILL COLLARS

Standard

Number

OD
(in.)

ID
(in.)

Length
(ft)

Weight
(lb/ft)

Typical Bending
Strength Ratio

SY5144-2007/API7-1

NC 23-31

3-1/8

1-1/4

30

22

2.57:1

NC 26-35 (2-3/8 IF)

3-1/2

1-1/2

30

27

2.42:1

NC 31-41 (2-7/8 IF)

4-1/8

2

30 or 31

34

2.43:1

NC 35-47

4-3 /4

2

30 or 31

47

2.58:1

NC 38-50 (3-1/2 IF)

5

2-1/4

30 or 31

54

2.38:1

NC 44-60

6

2-1/4

30 or 31

83

2.49:1

NC 44-60

6

2-13 /16

30 or 31

76

2.84:1

NC 44-62

6-1/4

2-1/4

30 or 31

91

2.91:1

NC 46-62 (4 IF)

6-1/4

2-13 /16

30 or 31

84

2.63:1

NC 46-65 (4 IF)

6-1/2

2-1/4

30 or 31

100

2.76:1

NC 46-65 (4 IF)

6-1/2

2-13 /16

30 or 31

93

3.05:1

NC 46-67 (4 IF)

6-3 /4

2-1/4

30 or 31

109

3.18:1

NC 50-70 (4-1/2 IF)

7

2-1/4

30 or 31

118

2.54:1

NC 50-70 (4-1/2 IF)

7

2-13 /16

30 or 31

111

2.73:1

NC 50-72 (4-1/2 IF)

7-1/4

2-13 /16

30 or 31

120

3.12:1

NC 56-77

7-3 /4

2-13 /16

30 or 31

140

2.70:1

NC 56-80

8

2-13 /16

30 or 31

151

3.02:1

6-5/8 API Reg

8-1/4

2-13 /16

30 or 31

162

2.93:1

NC 61-90

9

2-13 /16

30 or 31

196

3.17:1

7-5/8 API Reg

9-1/2

3

30 or 31

217

2.81:1

NC 70-97

9-3 /4

3

30 or 31

230

2.57:1

NC 70-100

10

3

30 or 31

243

2.81:1

8-5/8 API Reg

11

3

30 or 31

300

2.84:1


Standard of Drill Collars


NON-MAGNETIC DRILL COLLARS

Room Temperature. ASTM A 370

Drill Collar OD Range

Min. Yield Strength

Min. Tensile Strength

Min. Elongation %

Impact Test CHARPY V. notch

MPa

PSI

MPa

PSI

J (min.)

ft-lbs (min.)

2 3/4″ thru 3 7/8″

827

120 000

896

130 000

16

81

60

4″ thru 6 7/8″

758

110 000

827

120 000

18

7″ thru 11″

689

100 000

758

110 000

20


STEEL DRILL COLLARS

Room Temperature. ASTM 4145 H Modified

Drill Collar OD Range

Min. Yield Strength

Min. Tensile Strength

Min. Elongation %

Impact Test CHARPY V. notch

Hardness (Brinell)

MPa

PSI

MPa

PSI

J (min.)

ft-lbs (min.)

HBN

3 1/8″ thru 6 7/8″

758

110 000

965

140 000

13

54

40

285-341

7″ thru 11″

689

100 000

930

135 000


Manufacturing Process of Drill Collars


Q: What types of drill collars do you manufacture and supply?

A: We provide a comprehensive range of drill collars to meet various drilling requirements. Our main products include standard (slick) drill collars, spiral drill collars, non-magnetic drill collars, and drill collars with slip recesses. All our products strictly comply with international industry standards, including API Spec 7-1 and SY/T 5144.



Q: What materials and steel grades are used for your drill collars?

A: Our standard drill collars are manufactured using premium AISI 4145H chromium-molybdenum alloy steel, ensuring high strength and fatigue resistance. For non-magnetic drill collars, we use specialized low-magnetic-permeability alloy steels (such as N1310) designed specifically for environments requiring magnetic measurement tools.



Q: What are the available size ranges and connection types?

A: We manufacture drill collars with outer diameters ranging from 3-1/8 inches to 14 inches, with standard lengths of 9,150mm or 9,450mm. We offer various API-standard connection types, including NC23, NC26, NC31, NC35, NC38, NC44, NC46, and more. Custom double-shoulder connections can also be provided based on your specific needs.



Q: What are the advantages of using spiral drill collars or collars with slip recesses?

A: Spiral drill collars feature right-hand helical grooves machined on the outer surface, which significantly reduces the contact area with the wellbore and effectively prevents differential sticking. Drill collars with slip recesses have machined grooves at the pin end, allowing crews to use standard slips directly without needing lifting subs or safety clamps, thereby improving operational efficiency and safety.



Q: What is the Minimum Order Quantity (MOQ), and do you offer OEM/ODM services?
A: We are highly flexible with our MOQ, which can be as low as 1 piece for many standard sizes currently in stock. We fully support OEM and ODM services, including custom hardbanding, copper plating, or phosphate treatments on the threads to meet your specific project requirements.


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