Drill Collars
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-mag drill collars offer strength and hardness while neutralizing
magnetic inference. Compatible with standard drill string tools and stabilizers, our non mag drill collars are manufactured to API Spec 7-1. Inventory includes:
We treat our non-mag 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 stablizers
- Spiraling available on request
Mechanical Properties
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
Specifications
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
Used to add weight to the bit and stiffness to bottom hole assembly, our Drill Collars are an invaluable downhole tool.
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 metallurgical integrity of each and every bar.
Our Drill Collar bars are batch or continuous line heat treated and have both cold-worked and Phosphate coated connections.
Mechanical Properties
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
Standard Specifications for Slick or Spiral 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
*low torque face available
Recommended Slip and Elevator Recess Diameters for Drill Collars
Collar O.D. (in)
Elevator Recess Dia (in)
Slip Recess Dia (in)
Elevator Recess Radius (in)
Top Elevator Bore (in)
Lower Half Elevator Bore (in)
4 1/8
3 11/16
3 3/4
1/8
3 13/16
4 1/4
4 3/4
4 1/4
4 3/8
1/8
4 3/8
4 7/8
5
4 1/2
4 5/8
1/8
4 5/8
5 1/8
6
5 3/8
5 1/2
1/8
5 1/2
6 1/8
6 1/4
5 5/8
5 3/4
1/8
5 3/4
6 3/8
6 1/2
5 7/8
6
1/8
6
6 5/8
6 3/4
6
6 1/4
3/16
6 3/16
6 7/8
7
6 1/4
6 1/2
3/16
6 7/16
7 1/8
7 1/4
6 1/2
6 3/4
3/16
6 11/16
7 3/8
8
7 1/4
7 1/2
3/16
7 7/16
8 1/8
8 1/4
7 1/2
7 3/4
3/16
7 11/16
8 3/8
9 1/2
8 5/8
9
1/4
8 7/8
9 5/8
9 3/4
8 7/8
9 1/4
1/4
9 1/8
9 7/8
11
10 1/8
10 1/2
1/4
10 3/8
11 1/8
Additional Information
-
Drill Collars Brochure
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