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Drill Collar // Outer Diameter 3 1/8" Grade AISI4145H Weight 165 kg Connectors NC23 31

Supplier Tianhe Oil Group

Outer Diameter




Product Technical Configuration

Outer Diameter 3 1/8"
Grade AISI4145H
Weight 165 kg
Connectors NC23 31

Product country of origin: China

Location of the product: China

Available:  For Sale

Supplier reference: Z01-01000

Original manufacturer: Tianhe Oil Group

Finalized quotes will be sent directly to the supplier


Drill Collar is the basic component in the BHA which provides weight on the bit for drilling and keeps the drill string in tension.

Drill collar can be divided into standard drill collar, spiral drill collar and non-magnet drill collar.


Tianhe Oil Group Co. Ltd. is a global group. We are specialized in the production of drilling tools, including R&D, production, selling, leasing, maintenance and services. Tianhe has 5 main businesses spread across the globe in more than 50 countries in the world.

Tianhe Oil Group management prioritize its people, technology, continuous improvement and building brand awareness. Our mission is to continuously strive innovation and improvement and expand our business in the oilfield. We increased the investment in technology research and development, always looking to provide our global customers with the best technical products and services.

Tianhe Oil Group strongly believes and promotes Total Quality Management, implements the ISO quality management system, HSE management system and API standards. Our manufacturing facilities are well equipped with four automated induction heat treatment lines and dozens of other types of heat treatment ovens and well furnaces (Box type, well type, carburizing heat treatment furnace) to ensure full coverage of heat treatment required by the different products.

So far, Tianhe Oil Group has established strong business relationships with over 200 international oil & gas companies in supporting the top 50 oil producing countries. For example, we have partnered with Schlumberger, Halliburton, Baker Hughes, Weatherford, Shell, NOV, etc.

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Related Product Variants

Product Name Outer Diameter Grade Weight Connectors
Drill Collar 10" AISI4145H 3400 kg NC70 100
Drill Collar 104.78 mm AISI4145H 210 kg NC31 41
Drill Collar 11" AISI4145H 3800 kg 8 5/8 REG
Drill Collar 158.75 mm AISI4145H 500 kg NC46 62
Drill Collar 203.2 mm. AISI4145H 2041 kg NC56 80
Drill Collar 241.3 mm. AISI4145H 2851 kg 7 5/8 REG
Drill Collar 3 1/8" AISI4145H 165 kg NC23 31
Drill Collar 4 3/4" AISI4145H 285 kg NC35 47
Drill Collar 5" AISI4145H 323 kg NC38 50
Drill Collar 6 1/2" AISI4145H 520 kg NC46 65
Drill Collar 6 3/4" AISI4145H 600 kg NC50 67
Drill Collar 6" AISI4145H 480 kg NC44 60
Drill Collar 7 1/4" AISI4145H 1633 kg NC50 72
Drill Collar 7 3/4" AISI4145H 1850 kg NC56 77
Drill Collar 7" AISI4145H 700 kg NC50 70
Drill Collar 8 1/4" AISI4145H 2235 kg 6 5/8 REG
Drill Collar 88.9 mm. AISI4145H 176 kg NC26 35
Drill Collar 9 3/4" AISI4145H 3300 kg NC70 97
Drill Collar 9" AISI4145H 2630 kg NC61 90

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