Drill Collars

Drill Collars

USD 2256.00 - 7266.00
Minimum Order:
1 Piece(s)
Payment Terms:
T/T, L/C

Contact Supplier:

Supplier Details

Shanghai Garrison Oil Pipes Co., Ltd.

Free Member  (2009)

[ Shanghai, SG, China ]

Business Type:  Manufacturer, Trading Company

Supplier has 1 products

Contact Details

Quick Details

NC23-31----8 5/8 REG

Packaging and Delivery

Printed, Steel bale.
Delivery Lead Time:

Product Description

Drill collars are manufactured from AISI 4145H modified steel, and are supplied in the "as rolled" surface finish condition. Alternative surface finishes are available.

Trepanning and Heat Treatment
Drill collars are trepanned and drifted to API Spec 7-1. Full-length heat-treatment processes ensure that mechanical properties meet or exceed API Spec 7-1 requirements. A hardness range of 285-341, Brinell hardness and Charpy "V" notch minimum impact strength of 40 ft-lb at 70F are guaranteed one inch below the surface.

Drill collar material and process traceability are maintained from receipt of the mill's certified raw material to completion of manufacturing. Serial numbers are die stamped on bar bodies.

Rigid Inspection Procedures
We inspect all our drill collars to ensure compliance with API standards. These inspections include visual dimensional checks as well as ultrasonic inspections over the entire body of the drill collar.

Cold Rolling
Drill collar thread roots, as well as elevator recess upper radius, are cold-rolled. Cold rolling creates a compressive recess upper radius stress condition that increases fatigue life by minimizing crack initiation.

Phosphate-coated or Copper Plating
All connections are phosphate-coated or copper plated to improve resistance to corrosion.

Slip Groove, Elevator Groove and Size
Our company offers optional slip and elevator recesses to improve handling efficiency and safety. Unless otherwise specified, slip and elevator recesses are machined in compliance with API RP 7G guidelines.

Thread Protectors
Our company offers steel, cast steel and plastic steel thread protectors for its drill stem products.

Basic Information

Business Type:
Manufacturer, Trading Company
Year Established:
Total Employees:

About Us

Shanghai Garrison Oil Pipe Co., Ltd., maily operates drilling tools for the oil and gas indusry, including drill collars, non-magnetic drill collars, spiral drill collars, drill pipes,square kellys, hexagonal kellys, integral heavy weitht drill pipes, tri-spiral integral heavy weight drill pipe, non-magnetic bearing drill pipes,non-dig drill pipes, rotary subs, non-magnetic oriented subs, casing, tubing and etc.We also leasing,processing and repairing related equipment.

Our Products are used in oilfields all over China and exported to the United States, Canada, the UK, Russia, Chile, Turkey, Belgium, Kazakhstan, Kyrgyzstan, Uzbekistan, Pakistan, Singapore, India, Sultan, Iran, Saudi Arabia and Kuwait and etc with good evaluation by domestic and foreign customers.

Welcome customers from domestic and abroad to visit our company, negotiate business, the company sincerely hand in hand with customers to create brilliant!

Member History

Year Joined:
Membership Type:
Free Member

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Click Here to Call Us: 800-928-6710