Drill Collars/ Spiral Drill Collars

ACE-OCTG International Partnership Ltd.

DRILL COLLARS

The drill collars are made of modified AISI 4145H chromium molybdenum alloy steel. These drill collar bars are full-length heat treated and water quenched to obtain ASTM A-370 mechanical properties. Full mechanical and chemical mill test certifications are supplied with all drill collars. These mill test certifications guarantee a hardness range of 285 to 341 BHN and an impact value of 40 ft.-lbs. at room temperature one inch below the surface.

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

CONNECTIONS: All connections are precision-machined to API specifications. API relief groove pin and bore back box stress relief are available on request. Thread roots are cold-worked to offer a greater resistance to fatigue. All connections are phosphated to minimize galling during makeup and applied with thread storage compound. Thread protectors are installed to ensure adequate joint protection during shipment.

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 from 79 inches from box shoulder and the pin end is left uncut 30 inches from the pin shoulder.

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

Out side diameter, bore and length

Size and type of connection: each end of collar and special joint features
Slick or Spiral
Other special features: slip and elevator recesses and/or hard band type.

Size OD	Bore		Connection Style and Size				Approx. weight 31 ft.
Size OD	Standard	Optional	For standard bore		For optional bore		Approx. weight 31 ft.
In	In	In	NC	API	NC	API	Lbs.
3⅛	1¼	1	NC 23			2⅜ Reg.	660
3½	1½	1¼	NC 26	2⅜ IF	NC 26	2⅜ IF	801
4⅛	2	1¾	NC 31	2⅞ IF	NC 31	2⅞ IF	1043
4¾	2¼	2	NC 38	3½ IF	NC 38	3½ IF	1043
5	2¼	2	NC 38	3½ IF	NC 38	3½ IF	1451
6	2¼	2¹³∕₁₆	NC 44		NC 40	4½ FH	2561
6¼	2¼	2¹³∕₁₆	NC 46	4 IF	NC 46	4 IF	2806
6½	2¼	2¹³∕₁₆	NC 46	4 IF	NC 50	4½ IF	3085
6¾	2¼	2¹³∕₁₆	NC 46	4 IF	NC 50	4½ IF	3364
7	2¹³∕₁₆	2¼	NC 50	4½ IF	NC 50	4½ IF	3643
7¼	2¹³∕₁₆	3	NC 50	4½ IF		5½ FH	3714
7¾	2¹³∕₁₆	3	NC 56	6⅝ Reg.	NC 56	6⅝ Reg.	4337
8	2¹³∕₁₆	3	NC 56	6⅝ Reg.	NC 56	6⅝ Reg.	4675
8¼	2¹³∕₁₆	3		6⅝ Reg.		6⅝ Reg.	5016
8½	2¹³∕₁₆	3		6⅝ Reg.		6⅝ Reg.	5337
9	3	2¹³∕₁₆	NC 61	7⅝ Reg.	NC 61	7⅝ Reg.	6070
9½	3	2¹³∕₁₆		7⅝ Reg.		7⅝ Reg.	6727
10	3	2¹³∕₁₆	NC 70	8⅝ Reg.	NC 70	8⅝ Reg.	7532
11	3	2¹³∕₁₆	NC 77	8⅝ Reg.	NC 77	8⅝ Reg.	9269






		Slick Drill Spiral Drill Collar Collar


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