R&T Group
Kelly

Kelly

Specification of Kelly

Number

Qut Diameter(mm)

Length(m)

Standard

1

63.5

12.19

API 7-1

2

76.2

12.19

API 7-1

3

88.9

12.19

API 7-1

4

108.0

12.19

API 7-1

5

133.4

12.19

API 7-1

6

152.4

12.19

API 7-1


Features of Kelly

  • Designed according to advanced Modular-element principle with six ribs laid on tubes.
  • The advantages of our Kelly bar, such as low weight, high strength, high abrasion-resistance, and high-reliability are safeguarded.
  • Take use of alloy seamless tube imported from Germany Mannesmann or locally-made. Special hot-treatment enhances the material's strength more than 800Mpa.
  • Ribs made of alloy hot-treated specially enjoy both high hardness and perfect welding performance, high abrasion-resistance leads to high-reliability.
  • Square-stub through forging and heat treating has excellent mechanical properties.
  • Small clearance and high-precision mating of the drill pipe ensure its good working order and service performance.
  • Steel pipes through shot blasting have high surface quality and fatigue strength.
  • Automatic welding equipment can reduce welding defects and promote the reliability of weld seam.
  • Fulfill the rotary drilling rig full torque operation.
  • Kell is the driven part of the whole drill string.
  • Kelly is divided into Square Kelly and Hexagonal Kell, Elite Kelly, all conform to API Spec 7 – 1.
Leave a Message Email Us

we will contact you within 24 hours.

  • TEL:+86 546 7775669
  • FAX:+86 546 7775669
  • EMAIL:oilfield@rtpetro.com
  • ADDRESS:No. 1, Tai'er Zhuang Road, Hi-tech Industrial Development Zone, Dongying, Shandong, China