api oil drill collar from China manufacturer - Shaanxi Senwell Drilling Equipment Co..,Ltd

Payment Terms:	T/T,L/C
Place of Origin:	Shaanxi, China (Mainland)


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Product Detail

Model No.: SW

Production Capacity: 500pcs/year

Delivery Date: 10~30days

Standard: API 7-1

Means of Transport: Ocean,Land

Packing: Stander packings

key words: Drill collar

Drill collars are used to provide weight on bit so that drill pipes are kept in tension. Especially drill collars can keep drill bits centralized and

Type: Slick drill collar

Spiral drill collar

Non-magnetic material.

Hard band: Arnco100XT, Arnco200XT and Arnco300XT; Botn1000, Botn3000, TCS8000, TCS-Titanium, Armacor M etc. Also we can make according to customers' requirements.

Size: OD: 3 1/8"~~11"; ID: 1 1/2"Min. Length:10'~~31'

Detail specification

Standard size ,bores and connection for Drill Collar
Style of connection	OD		ID		Length	Bevel	Bending strength Ratio
Style of connection	mm	in	mm	in	mm	diameter mm	Bending strength Ratio
NC23-31	79.4	3 1/8	31.8	1 1/4	9150	76.2	2.57:1
NC26-35(23/8IF)	88.9	3 1/2	38.1	1 1/2	9150	82.9	2.42:1
NC31-41(27/8IF)	104.8	4 1/8	50.8	2	9150	100.4	2.43:1
NC35-47	120.7	4 3/4	50.8	2	9150	114.7	2.58:1
NC3850(31/2IF)	127.0	5	57.2	2 1/4	9150	121.0	2.38:1
NC44-60	152.4	6	57.2	2 1/4	9150or9450	144.5	2.49:1
NC44-62	158.8	6 1/4	57.2	2 1/4	9150or9450	149.2	2.91:1
NC46-62(4IF)	158.8	6 1/4	71.4	2 13/16	9150or9450	150.0	2.63:1
NC46-65(4IF)	165.1	6 1/2	57.2	2 1/4	9150or9450	154.8	2.76:1
NC46-65(4IF)	165.1	6 1/2	71.4	2 13/16	9150or9450	154.8	3.05:1
NC46-67(4IF)	171.4	6 3/4	57.2	2 1/4	9150or9450	159.5	3.18:1
NC50-67(41/2IF)	171.4	6 3/4	71.4	2 13/16	9150or9450	159.5	2.37:1
NC50-70(41/2IF)	177.8	7	57.2	2 1/4	9150or9450	164.7	2.54:1
NC50-70(41/2IF)	177.8	7	71.4	2 13/16	9150or9450	164.7	2.73:1
NC50-72(41/2IF)	184.2	7 1/4	71.4	2 13/16	9150or9450	169.5	3.12:1
NC50-77	196.8	7 3/4	71.4	2 13/16	9150or9450	185.3	2.70:1
NC50-80	203.2	8	71.4	2 13/16	9150or9450	190.1	3.02:1
6 5/8REG	209.6	8 1/4	71.4	2 13/16	9150or9450	195.7	2.93:1
NC61-90	228.6	9	71.4	2 13/16	9150or9450	212.7	3.17:1
7 5/8REG	241.3	9 1/2	76.2	3	9150or9450	223.8	2.81:1
NC70-97	247.6	9 3/4	76.2	3	9150or9450	232.6	2.57:1
NC70-100	254.0	10	76.2	3	9150or9450	237.3	2.81:1
8 5/8REG	279.4	11	76.2	3	9150or9450	266.7	2.84:1

Mechanical Property of Drill Collar
OD		Yield Strength	Tensile Strength	Elongation	Brinell Hardness HB	Charpy
mm	in inch	σ 0.2 Mpa	σ b Mpa	4%	Brinell Hardness HB	AKVJ
79.4-171.4	3 1/8-6 3/4	≥758	≥965	≥13	285-341	≥54
177.8-279.4	7-11	≥689	≥930	≥13	285-341	≥54

Stress Relief Groove for Thread Connection
Style of Connection	Length between Inner Thread Shoulder and the last Dens	Diameter of Inner Thread	Taper of the Hole nest to inner Thread	Outer Thread Diameter	Length between alternative Inner Thread Shoulder and Stress Relief Groove
	±1.59mm	Dcb+0.40,-0	±20.83	DRG+0 -0.79	LRG +0 -3.18
	±1.59mm	mm	mm/m	mm	mm
NC35	82.6	82.15	166.67	82.15	85.73
NC38(3 1/2IF)	88.9	88.11	166.67	89.3	92.08
NC44	101.6	101.6	166.67	106.36	104.78
NC46(4IF)	101.6	106.76	166.67	109.93	104.78
NC50(4 1/2IF)	101.6	117.48	166.67	120.65	104.78
NC56	114.3	121.84	250	134.14	117.48
NC61	127	132.95	250	149.25	130.18
NC70	139.7	152	250	171.05	142.88
6 5/8REG	114.3	134.14	166.67	137.72	117.48
7 5/8REG	120.7	133.35	250	162.72	123.83
8 5/8REG	123.8	149.25	250	184.94	127
Note: The connection of NC23,26,31 and 2 3/8IF are without stress relief groove mould for their thin wall.