API7-1 Drill Collars/Non-Magnetic Drill Collar Spiral Drill Collar Nmdc

• After-sales Service: 3 Years
• Warranty: 3 Years
• Manufacturing Process: CNC Milling
• Surface Treatment: Polishing
• Operation Pressure: Atmospheric Pressure
• Material: Alloy
• Model NO.: 3-1/8---11inch
• Standard: API7-1 7-2
• Connection: API Reg API If Nc
• Length: 9140mm 9450mm
• Hard Banding: Arnco 350xt or Other
• Non Magnetic Material: AISI 4154h
• Magnatic Material: P530 P550
• Transport Package: Steel Support
• Specification: 3-1/8inch---11inch
• Trademark: JX
• Origin: China
• HS Code: 8431431000
• Production Capacity: 3000pieces/Years

Product Description

Product Description

Drill Collars are integral heavy-wall joints that are manufactured from a solid bar of modified alloy steel. The solid bars are quenched and tempered to obtain the required mechanical properties, then trepanned, drifted and threaded. All drill collars are heat-treated with hardness within 285 to 341 BHN, which are guaranteed one inch below the surface of the pipe.

Features

1. Hardness range of 285 to 341 BHN and a charpy impact value of 40ft/lbs are guaranteed for evenly distributed 16 points in any cross sections at room temperature.

2. Connections as phosphate coated father machining to protect the threads from corrosive elements and to prevent galling upon initial make -up. Thread roots are cold rolled on API and H0-90 connections.

3. Pressed steel thread protectors are supplied to all drill collar that are equipped with standard connections.

4. Manufactured strictly according to API standard.

5. Widely used in oil, gas, HDD and geothermal field.
 

Product Parameters

 

Size (in)	O.D (mm)	I.D. (in)	Code	Thread	Length (mm)	Weight (kg)
3 1/8	79.4	1-1/4	NC23-31	NC23	9140	298
3 1/2	88.9	1-1/2	NC26-35	NC26	9140	364
4 1/8	104.8	2	NC31-41	NC31	9140/9450	474/490
4 3/4	120.6	2	NC35-47	NC35	9140/9450	674/697
5	127	2-1/4	NC38-50	NC38	9140/9450	725/749
6	152.4	2-1/4	NC44-60	NC44	9140/9450	1125/1163
6	152.4	2-13/16	NC44-60	NC44	9140/9450	1022/1056
6 1/4	158.8	2-1/4	NC44-62	NC44	9140/9450	1237/1279
6 1/4	158.8	2-13/16	NC46-62	NC44	9140/9450	1134/1172
6 1/2	165.1	2-1/4	NC46-65	NC46	9140/9450	1352/1398
6 1/2	165.1	2-13/16	NC46-65	NC50	9140/9450	1249/1291
6 3/4	171.4	2-1/4	NC46-67	NC46	9140/9450	1471/1521
7	177.8	2-1/4	NC50-70	NC50	9140/9450	1597/1651
7	177.8	2-13/16	NC50-70	NC50	9140/9450	1494/1545
7 1/4	184.2	2-13/16	NC50-72	NC50	9140/9450	1625/1680
7 3/4	196.8	2-13/16	NC56-77	NC56	9140/9450	1895/1960
8	203.2	2-13/16	NC56-80	NC56 or 6- 5/8REG	9140/9450	2040/2109
8 1/4	209.6	2-13/16	6-5/8REG	6-5/8REG	9140/9450	2188/2263
9	228.6	2-13/16	NC61-90	NC61	9140/9450	2658/2748
9 1/2	241.3	2-13/16	7-5/8REG	7-5/8REG	9140/9450	2954/3054
9 3/4	247.6	3	NC70-97	NC70	9140/9450	3127/3234
10	254	3	NC70-100	NC70	9140/9450	3308/3421
11	279.4	3	8-5/8REG	8-5/8REG	9140/9450	4072/4210
Mechanical properties: <7 inch Drill Collar: Yield Strength≥758MPa, Tensile Strength≥965MPa, Four times elongation ≥13%, Impact energy Ak≥54J (Single impact work≥47J, Average≥54J), Hardness range: 285HB~341HB ≥7inch Drill Collar: Yield Strength≥689MPa, Tensile Strength≥931MPa, Four times elongation≥13%, Impact energy Ak≥54J (Single impact work≥47J, Average≥54J), Hardness range 285HB~341HB
Drill collar can be customized as per customer's design.

Detailed Photos

 

drawing sheet

machining process