EBIC OILFIELD EQUIPMENT LTD.
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.
Here at EBIC OILFIELD EQUIPMENT LTD. we know not every job is the same, therefore
requiring a wide variety of collars.? All of our drill collars can be customized to suit your
specific requirements by adding some of the features listed below:
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 below |
Standard Drill Collar Features & Options
-
API pin stress relief groove and box boreback
An API pin stress relief can be used on all drill collars and downhole tools.? It
is a recommended option in situations where fatigue can occur as a result of
bending.? By removing any unengaged threads in the high stress areas of the
drill collar connection, it is less likely to crack due to fatigue because the bending will take place in the area of the connection with smooth surfaces that are free of stress concentrations.
-
Phosphate coating
All threaded connections can be treated with a phosphate coating to help prevent threads from galling.
-
Spiraling
Three optional spiral grooves can be placed on the outer diameter of the collar
to allow the mud to circulate freely around the drill collar.? This is to equalize
the pressure as well as to prevent a seal forming.? This will help reduce any
chances of differential sticking.
-
Hardbanding
Optional hardbanding is available in various materials.? Drill collar hardbanding
is normally applied flush to the outside diameter of the bar.? Other configurations are available upon request.
-
Elevator and slip recesses
Optional slip and elevator recesses are available to improve handling and safety.
These two features can be used together or separately.? These options are cut as per API recommended practice 7G.
| Drill Collar OD |
Elevator Recess
OD (ER)
(in) |
Slip Recess
OD (SR)
(in) |
Elevator Recess Radius (R)
(in) |
| 4-1/8 |
3-11/16 |
3-3/4 |
1/8 |
| 4-3/4 |
4-1/4 |
4-3/8 |
1/8 |
| 5 |
4-1/2 |
4-5/8 |
1/8 |
| 6 |
5-3/8 |
5-1/2 |
1/8 |
| 6-1/4 |
5-5/8 |
5-3/4 |
1/8 |
| 6-1/2 |
5-7/8 |
6 |
1/8 |
| 6-3/4 |
6 |
6-1/4 |
3/16 |
| 7 |
6-1/4 |
6-1/2 |
3/16 |
| 7-1/4 |
6-1/2 |
6-3/4 |
3/16 |
| 7-3/4 |
7 |
7-1/4 |
3/16 |
| 8 |
7-1/4 |
7-1/2 |
3/16 |
| 8-1/4 |
7-1/2 |
7-3/4 |
3/16 |
| 9 |
8-1/8 |
8-1/2 |
1/4 |
| 9-1/2 |
8-5/8 |
9 |
1/4 |
| 9-3/4 |
8-7/8 |
9-1/4 |
1/4 |
| 10 |
9-1/8 |
9-1/2 |
1/4 |
| 11 |
10-1/8 |
10-1/2 |
1/4 |
?These features are not recommended for collars with OD below 4-3/4" |
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