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Drill Collars
The Drill Collars are made of modified AISI 4145 H Chromium Molybdenum alloy Steel. These Drill Collars bars are full length heat treated, quenched to obtain mechanical properties as per ASTM A-370. All Drill Collars are provided with a set of Mill Test Certification as per BS EN 10204 – latest edition. These mill test certification assures a hardness range of 285-341 BHN and a Charpy V Notch impact value of 40 ft lbs at room temperature one inch below the surface. Connections are precision machined to API specifications.

To ensure close tolerance bores, all drill collars bars are trepanned then drifted to API Spec 7-1 requirements. Bar surface finish is “as rolled” which is original mill finish.

CONNECTIONS :
All connections are precision machined to API Spec 7-1 (API Relief Groove Pin and Bore Back Box Stress Relief Features are available on request). Thread roots are cold rolled to offer a greater resistance to fatigue. All connections are then phosphated to minimize galling during makeup. API dope or thread compound is applied on connections. Pressed steel thread protectors or Cast steel lifting bail type thread protectors (As per customer requirements) are installed to ensure adequate joint protection during Handling, Packaging, Storage & Delivery.

SPIRAL DRILL COLLARS :
The Spiral cut is added to a Drill Collar to prevent the likelihood of differential wall sticking by reducing wall contact between the Drill Collar and the wall of the Hole. The box end of the Spiral collar is left uncut 79 inches from Box shoulder and the pin end is left uncut 30 inches from Pin shoulder as per Standard Practices.

DIMENSIONAL DATA
(STANDARD SIZES, BORES, AND CONNECTIONS FOR DRILL COLLARS)
Size OD
Inch
Bore
Connection Style and Size
Approx. Weight 31ft. Lbs.
Standard
In
Optional
In
For Standard Bore

NC
API
For Optional Bore

NC
API
3 1/8
1 1/4
1
NC 23
---
---
2 3/8 Reg
682
3 1/2
1 1/2
1 1/4
NC 26
2 3/8 IF
NC 26
2 3/8 IF
837
4 1/8
2
1 3/4
NC 31
2 7/8 IF
NC 31
2 7/8 IF
1085
4 3/4
2
2
NC 35
NC 38
3 1/2 IF
1550
5
2 1/4
2
NC 38
3 1/2 IF
NC 38
3 1/2 IF
1643
6
2 1/4
2 13/16
NC 44
---
NC 40
4 1/2 FH
2573
6 1/4
2 1/4
2 13/16
NC 44
---
NC 46
4 IF
2821
6 1/4
2 13/16
2 13/16
NC 46
4 IF
NC 46
4 IF
2573
6 1/2
2 1/4
2 13/16
NC 46
4 IF
NC 50
4 1/2 IF
3069
6 1/2
2 13/16
2 13/16
NC 46
4 IF
NC 50
4 1/2 IF
2821
6 3/4
2 1/4
2 13/16
NC 46
4 IF
NC 50
4 1/2 IF
3348
7
2 1/4
2 1/4
NC 50
4 1/2 IF
NC 50
4 1/2 IF
3627
7
2 13/16
2 1/4
NC 50
4 1/2 IF
NC 50
4 1/2 IF
3410
7 1/4
2 13/16
3
NC 50
4 1/2 IF
---
5 1/2 FH
3689
7 3/4
2 13/16
3
NC 56
6 5/8 Reg
NC56
6 5/8 Reg
4309
8
2 13/16
3
NC 56
6 5/8 Reg
NC 56
6 5/8 Reg
4650
8 1/4
2 13/16
3
---
6 5/8 Reg
---
6 5/8 Reg
4960
9
2 13/16
2 13/16
NC 61
7 5/8 Reg
NC 61
7 5/8 Reg
6045
9 1/2
3
2 13/16
---
7 5/8 Reg
---
7 5/8 Reg
6696
9 3/4
3
2 13/16
NC 70
8 5/8 Reg
NC 70
8 5/8 Reg
7099
10
3
2 13/16
NC 70
8 5/8 Reg
NC 70
8 5/8 Reg
7533
11
3
2 13/16
---
8 5/8 Reg
---
8 5/8 Reg
9269


Interdril offers severals hardbanding options from Fine Particle, Flush Raised Carbide or special hardbanding options supplied by third parties.

Interdril recommended Hardbanding design is as follows
  • Drill Collars without slip & elevator recess:10" long wear bands at 30" minimum from the pin end.
  • Drill Collars with slip & elevator recess: 4" long wear bands above elevator recess, 1" band between elevator & slip recess & 10" long wear band bellow slip recess.
  • Drill Collars with slip recess only: 10" long wear band bellow slip recess.
Hardbanding Types available: Tungsten Carbide, SMOOTH X, ARMACORM, Arnco100, 200 & 300XT,and TCS Titanium etc.

OPTION: Hardbanding can be provided on request.
Hardbanding available Tungsten Carbide, ARNCO 100XT, 200XT, 300XT, SMOOTH X, ARMACOR M, TCS Titanium

When ordering or requesting quotations on Drill Collars, please specify:
  • Outside Diameter, Bore and Length
  • Size and type of connection, Stress Relief features
  • Slick or Spiral
  • Other special features: Elevator and Slip Recess and or Harbanding type
NON MAGNETIC DRILL COLLARS
Interdril stock Non Magnetic Drill Collars bars of reputed manufacturers like Schoeller-Bleckmann Darron

Mechanical Properties of Non Magnetic Drill Collar material

 
P 530
P 530 HS
Yield Strength min (ksi)
3 ½” to 6 7/8” OD
7” OD to 11” OD
110
100
120
110
Tensile Strength min (ksi)
3 ½” to 6 7/8” OD
7” OD to 11” OD

120
110

130
120
Elongation (%)
Minimum

25

25
Reduction of area (%) minimum
50
50
Impact Energy min (ft./lb)
ISO – longitudinal
90
90
Hardness - Brinell (HBW)
260-350
285-365
Endurance Strength min (ksi)
N = 107
---
50

Chemical Composition
Grade
Elements
C
Si
Mn
S
P
Cr
Mo
Ni
N
P 530
P 530 HS
0.05
Max
0.25
0.55
19.0
20.0
0.040
Max
0.035
Max
13.0
14.0
0.25
0.55
1.0
2.0
0.25
0.35


Interdril can supply various sizes of Non Magnetic Drill Collars, Pony Non Magnetic Drill Collars, Flow Subs etc.