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DRILL COLLARS

DRILL COLLARS


 

The drill collars are made of modified AISI 4145H choromium molybdenum alloy steel. These drill collar bars are full-lenght heat treated and water quenched to obtained ASTM A-370 mechanical properties. Full mechanical and chemical mill test certification are supplied with all drill coralls. These mill test certifications guarantee a hardness range of 265 to 341 BHN and an IZOD impact value of ft-lbs at room temperature one inch below the surface.

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

CONNECTIONS: All connection are precision-machined to API specifications and quality-control inspected. (API rellef groove pin and bore back box stress rellef feature are available on request.) Thread roots are cold-worked to offer a greater resistance to fatigue. All connection are then chemically treated to produce a surface finish that minimizeds calling during makeup. Threated protectors are installed to ensure adequate joint protection during shipment.

SPIRAL DRILL COLLARS

The spiral cut is added to a drill collar to a drill collars to prevent the liklihood of differential wall-sticking by reducing wall contact between the drill collar and the wall of the hole. The box end of the spiral collars is left uncut from 18 to 24 inches, and the pin end is left uncut 12 to 22 inches from the shoulder.

When ordering or requesting quotations on drill collars, please specify:

  1. Outside diameter, bore and lenght
  2. size and type of connection: each end of collars and specail joint features
  3. Slick or spiral
  4. Other special feature: fishing neck elevatore and slip recesses and/or hard band type.
STANDARD SIZES, BORES AND CONNECTIONS FOR DRILL COLLARS
Size OD
In
Bore Connection Style and Size Approve
weight
31 ft.
Lbs.
Standard
In
optionalIn For standed Bore For optional Bore
NC API NC API
31/2 1-1/4 1 NC 23   26 NC 2-3/8 Reg. 660
3-1/2 1-1/2 1-1/2 NC 26 2-3/4 IF 31 NC 2-3/8 IF 801
4-1/8 2 1-3/8 NC 31 2-7/8 IF 38 NC 2-7/8 IF 1043
4-1/4 2-1/4 2 NC 38 3-1/2 IF 38NC 3-1/2 IF 1043
5 2-1/4 2 NC 38 3-1/2 IF 40NC 3-1/2 IF 1451
6 2-1/4 2-13/16 NC 44   46NC 4-1/8 FH 2561
6-1/4 2-1/4 2-13/16 NC 46 4 IF 50NC 4 IF 2808
6-1/2 2-1/4 2-13/16 NC 46 4IF 50NC 4-1/2 IF 3085
6-3/4 2-1/4 2-13/16 NC46 4IF 50NC 4-1/2 IF 3364
7 2-13/16 2-1/2 NC 50 4-1/2IF   4-1/2 IF 3643
7-1/4 2-13/16 3 NC 50 4-1/2IF 56 NC 5-1/2 FH 3714
7-3/4 2-13/17 3 NC 56 6-5/8Reg. 56NC 6-5/8 Reg. 4337
8 2-13/18 3 NC56 6-5/8Reg.   6-5/8 Reg. 4675
8-1/4 2-13/18 3   6-5/8Reg.   6-5/8 Reg. 5016
8-1/2 2-13/18 3   6-5/8Reg. 61NC 6-5/8 Reg. 5337
9 3 2-13/16 NC 61 7-3/4Reg.   7-5/8 Reg. 6070
9-1/2 3 2-13/16   7-5/8Reg.   6-5/8 Reg. 6727
10 3 2-13/16 NC 70 8-1/2Reg. 70NC 6-5/8 Reg. 7532
11 3 2-13/16 NC 77 8-5/8Reg. 77NC 6-5/8 Reg. 9269





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