Drill Collars


1	Drill Collars
2	November 2018
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5	The drill collars are made of modified AISI 4145H choromium 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 certification are supplied with all drill collars. 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.
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7	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.
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9	CONNECTIONS: All connections are precision-machined to API specifications and quality-control inspected. (API relief groove pin and bore back box stress relief feature are available on request.) Thread roots are cold-worked to offer a greater resistance to fatigue. All connections are then chemically treated to produce a surface finish that minimizes calling during makeup. Threated protectors are installed to ensure adequate joint protection during shipment.
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11	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 collars is left uncut from 18 to 24 inches, and the pin end is left uncut 12 to 22 inches from the shoulder.
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13	Size OD In	Bore		Connection Style and Size				Approve weight 31 ft. Lbs.
14		Bore		Connection Style and Size
15		Standard In	Optional In	For Standard Bore		For Optional Bore
16		Standard In	Optional In	NC	API	NC	API
17	3 ⅟₂	1 ⅟₄	1	NC 23		26 NC	2 ⅜ Reg.	660
18	3 ⅟₂	1 ⅟₂	1 ⅟₂	NC 26	2 ³∕₄ IF	31 NC	2 ⅜ IF	801
19	4 ⅟₈	2	1 ⅜	NC 31	2 ⅞ IF	38 NC	2-7/8 IF	1043
20	4 ⅟₄	2 ⅟₄	2	NC 38	3 ⅟₂ IF	38NC	3 ⅟₂ IF	1043
21	5	2 ⅟₄	2	NC 38	3 ⅟₂ IF	40NC	3 ⅟₂ IF	1451
22	6	2 ⅟₄	2 ¹³∕₁₆	NC 44		46NC	4 ⅟₈ FH	2561
23	6 ⅟₄	2 ⅟₄	2 ¹³∕₁₆	NC 46	4 IF	50NC	4 IF	2808
24	6 ⅟₂	2 ⅟₄	2 ¹³∕₁₆	NC 46	4IF	50NC	4 ⅟₂ IF	3085
25	6 ³∕₄	2 ⅟₄	2 ¹³∕₁₆	NC46	4IF	50NC	4 ⅟₂ IF	3364
26	7	2 ¹³∕₁₆	2 ⅟₂	NC 50	4 ⅟₂ IF		4 ⅟₂ IF	3643
27	7 ⅟₄	2 ¹³∕₁₆	3	NC 50	4 ⅟₂ IF	56 NC	5 ⅟₂ FH	3714
28	7 ³∕₄	2 ¹³∕₁₇	3	NC 56	6 ⅝ Reg.	56NC	6 ⅝ Reg.	4337
29	8	2 ¹³∕₁₈	3	NC56	6 ⅝ Reg.		6 ⅝ Reg.	4675
30	8 ⅟₄	2 ¹³∕₁₈	3		6 ⅝ Reg.		6 ⅝ Reg.	5016
31	8 ⅟₂	2 ¹³∕₁₈	3		6 ⅝ Reg.	61NC	6 ⅝ Reg.	5337
32	9	3	2 ¹³∕₁₆	NC 61	7 ³∕₄ Reg.		7 ⅝ Reg.	6070
33	9 ⅟₂	3	2 ¹³∕₁₆		7 ⅝ Reg.		6 ⅝ Reg.	6727
34	10	3	2 ¹³∕₁₆	NC 70	8 ⅟₂ Reg.	70NC	6 ⅝ Reg.	7532
35	11	3	2 ¹³∕₁₆	NC 77	8 ⅝ Reg.	77NC	6 ⅝ Reg.	9269
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37	ORDERING INFORMATION:
38	When ordering or requesting quotations on drill collars, please specify:
39	1. Outside diameter, bore and length.
40	2. Size and type of connection: each end of collars and special joint features.
41	3. Slick or spiral.
42	4. Any other special features: fishing neck elevatore and slip recesses and/or hard band type.
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