Product Details

API Drill collar/Integral spiral drill collar in Drill rod/Non-magnetic drill collar in oil and gas

Product Description

Drill collar is basic component which provides weight on the bit for drilling and keeps the drill sting in tension. Drill collar is manufactured from 4145H modified quenched and tempered steel, strict metallurgical specifications are followed to insure that full length heat treating produces a consistent maximum depth of hardness.

* Slick Drill Collar: provide weight to drill bit so that drill pipe is in tension. Especially the drill collar can keep centralizing for drill bit and hole track by large rigidity.

* Spiral Drill Collar: reduce contact area with hole so as to avoid efficiently bit sticking from diffirential pressure.

* Non-magnetic Drill Collar: as cold rolled finish on both ID and OD surface with unique technical process strengthen the structure and ensures the tools with optimal resistance to stress, corrosion, cracking and the mechanical performance is greatly enhanced.

Technical parameter

1. Material AISI 4145H, 4145HMod, Non-Magnetic Drill Collar

OD+4mm	Connection	ID+1.59mm	Length±152.4mm	Chamfering Diameter ±0.4mm	Length of one spiral ±25.4mm
79.4	NC23	31.8	9140 or 9450	76.2	679
88.9	NC26	38.1	9140 or 9450	82.9	679
104.8	NC31	50.8	9140 or 9450	100.4	914
114.3	NC31	50.8	9140 or 9450	100.4	914
120.6	NC35	50.8	9140 or 9450	114.7	965
127	NC38	57.2	9140 or 9450	121	965
139.7	NC40	57.2	9140 or 9450	132.2	1067
158.8	NC46	71.4	9140 or 9450	144.5	1067
168.3	NC50	71.4	9140 or 9450	154.8	1168
177.8	NC50	71.4	9140 or 9450	164.7	1168
196.8	NC50/NC56	71.4	9140 or 9450	185.3	1626
203.2	NC56/6 5/8REG	71.4	9140 or 9450	190.1	1727
209.6	6 5/8REG	71.4	9140 or 9450	195.6	1727
215.9	6 5/8REG	71.4	9140 or 9450	195.6	1727
228.6	6 5/8REG	71.4	9140 or 9450	212.7	1829
241.3	7 5/8REG	76.2	9140 or 9450	223.8	1829
254	7 5/8REG/8 5/8REG	76.2	9140 or 9450	237.3	1930
279.4	8 5/8REG	76.2	9140v9450	266.7	2032

2. Non-Magnetic Drill Collar Mechanical Property

Fishing Neck OD	Yield Strength Rf(MPa)	Tensile Strength Rm(MPa)	Elongation Ali(%)	Reduction of Area (%)	Impact Value (Joule)	Hardness HB
3 1/2”-6 7/8”	≥758	≥827	≥18	≥45	≥81J(RT)	285~341
7”-11”	≥689	≥758	≥20	≥45	≥81J(RT)	285~341