Product DescriptionDrill 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.Features1. 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)CodeThreadLength(mm)Weight(kg)3
1/879.41-1/4NC23-31NC2391402983 1/288.91-1/2NC26-35NC2691403644
1/8104.82NC31-41NC319140/9450474/4904
3/4120.62NC35-47NC359140/9450674/69751272-1/4NC38-50NC389140/9450725/7496152.42-1/4NC44-60NC449140/94501125/11636152.42-13/16NC44-60NC449140/94501022/10566
1/4158.82-1/4NC44-62NC449140/94501237/12796
1/4158.82-13/16NC46-62NC449140/94501134/11726
1/2165.12-1/4NC46-65NC469140/94501352/13986
1/2165.12-13/16NC46-65NC509140/94501249/12916
3/4171.42-1/4NC46-67NC469140/94501471/15217177.82-1/4NC50-70NC509140/94501597/16517177.82-13/16NC50-70NC509140/94501494/15457
1/4184.22-13/16NC50-72NC509140/94501625/16807
3/4196.82-13/16NC56-77NC569140/94501895/19608203.22-13/16NC56-80NC56
or 6- 5/8REG9140/94502040/21098
1/4209.62-13/166-5/8REG6-5/8REG9140/94502188/22639228.62-13/16NC61-90NC619140/94502658/27489
1/2241.32-13/167-5/8REG7-5/8REG9140/94502954/30549
3/4247.63NC70-97NC709140/94503127/3234102543NC70-100NC709140/94503308/342111279.438-5/8REG8-5/8REG9140/94504072/4210Mechanical
properties:
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