API 7-1 Non-Magnetic Drill Collar Slick Drill Collar Od 79.4mm to 279.4mm

• After-sales Service: 7 Days a Week 24 Hours Per Day
• Warranty: 12 Months
• Manufacturing Process: Forging
• Surface Treatment: Spray-Paint
• Operation Pressure: Atmospheric Pressure
• Material: Stainless Steel
• Model NO.: drill collar
• Transport Package: Standard Export Package
• Specification: customized
• Trademark: BOBAN & OEM
• Origin: China
• HS Code: 8431431000
• Production Capacity: 1000 PCS Per Month

Product Description

Drill Collar 
Drill Collar

Production as per API Spec. 7-1, NS-1, DS-1 and Customer requirements.
Materials :AISI 4145H, AISI4145H modified steel and Non-magnetic.
Non magnetic Drill Collar with outstanding resistant to stress corrosion cracking and no tendency to galling.
Slick Non magnetic Drill collar/Spiral Non magnetic Drill collar/Flex Non magnetic Drill collar, they are function as housing for the MWD tools and provide weight for drilling string.
 

Drill Collar Technical Parameter
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

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

A relative permeability: μ(Gauss/ Oersted)<1.010
B magnetic field gradient: Max. Deviation of the Magnetic field in the inner hole to uniform magnetic field: ≤±0.05μT
C intergranular corrosion (Anti corrosion): as per ASTM A262E for intergranular corrosion test.