Kelly bars are key components in the execution of boreholes with hydraulic rotary drilling rigs. They transfer the torque of the rotary drive and the crowd pressure of the crowd system concurrently to the drilling tool. A Kelly bar consists of 3 – 5 telescopic tubular sections with a system of drive keys and lock recesses, welded onto their outer surfaces.

KR Drill - Characteristic

Materials---What we agree with ?

A-We fully understand that the Materials is the first key step to make the good Kelly bar, so strictly control of pipes materials -SY550/ZT600 under quenched-tempered heat treatment

B-Reasonable radian of Kelly ribs and Pressure Key board of 30CrMoTi

C-Bottom inner hole design of Kelly box for better performance of heat-treatment with 35CrMo.

Contructure---What we understand?

A-Professional technical engineer to make the optimal gaps of each sections in order to be more safer and longer life.

B-3 or 6 sets Kelly ribs and customized Pressure key boards reasonable matches to be adaptabe for complicated geological conditions.

C-Reinforcement ring was attaced on each termiinal joint top to reduce the risk of cracking during drilling. 

D-Patened technology like the wider of IMT Kelly ribs to be more wear-resistant.

Welding---What we pay attention to ?

Except the professional machine welding, the experienced welder will be for the key parts with professional manual welding to be longer working life.

Warranty time

ONE year or 2000 hours is the warranty of our Kelly bar. We treat our reputaion and your satisfaction as our company life.

Quality control

Formal details drawing will be sent for confirming producing, strictly rule for arrange and cutting materials, professional technical will pay attention to the key parts by manual welding, Detector will test all the sections after producing, and assembling sections in order to confirm the overall fluency of Kelly bars. 

Delivery time & Package

A-7 working days after confirm the order.

B-Export standrad package by aluminum film rapped, with palley under for lifing and shipping. Small worn parts are packed by wooden box for successfully shipment.

Maintenance & After-sale service

Worn parts like Springs,Terminal joint,Kelly box,Flange parts...as ready stock in case of emergency needs. Online video service once small case and Engineers overseas service once quality problems. 

Tips of Kelly bar daily using & maintenance

Good habits will effectively avoid damage of the Kelly bar.

a-Open it regularly for inspection and repair in time when wear is found.

b-Regularly check the welding seam.

c-Look at the appearance, listen to the sound of pumping and pulling, feel the friction and the sense of impact of each section.

 What we supply?

Segmental Casing . Kelly bar . Drilling tools