Oil Well Drilling Equipment  5-1/2" Square Kelly for Rig kelly bar

1. Specifications
1) square&hexagonal kelly

2) API 7-1&SY/T6509-2000

3) size:2-1/2" 2-7/8" 3" 3-1/2" 4-1/4" 5-1/4" 

4) Use: Well Drilling

5) Kelly type: square or hexagonal

6) Box connection type: 6 5/8 REG

7)Material:AISI 4142H-4145H forged or rolled alloy steel

8) Packaging Detail: Iron shelves or as your requirement

10) Factory directly

2. Briefly Introduction of Kelly

♦ The Petroleum drilling tools of kingwell mainly include Drill collars, Spiral drill collars, Non magnetic drill collars, Short drill collars, Drill tool stabilizers, Non magnetic drill tool stabilizers, Integral heavy weight drill pipes, Kelly, etc.

♦ The details of Kelly as follows,

KINGWELL precision-machined Kelly is a heavy square or hexagonal steel bar supported by the swivel through the rotary table and connected to the first joint of drill pipe in the drill string.

Material: AISI 4142H-4145H forged or rolled alloy steel

Use: Kelly is the drive part of whole drill string, it transmit the torsional energy from the rotary table to the bit in the bottom of the hole.

Standard: API Spec7-1 and SY/T6509-2000

3. Features and Benefits

1).Quenching plus tempering thermal treatment will be conducted over the whole length with a Brinell hardness range of 285-341;

20.Minimum average Charpy Impact Value of 40 ft-lbs are maintained one inch below the surface at room temperature;

3).Ends and drive sections, IDs, drive cross-section and joint machined and inspected to API specifications;

4).Kelly bars ultrasonically inspected over full length and section;


4. Details Specification

Company Info

Xi'an Kingwell Oilfield Machinery Co.,Ltd is a highly reputable supplier for oilfield equipment and services to Oil & Gas industries and provide complete solutions.

With over 10 years developing, we were developed from the beginning drilling service to manufacture factory who produce OCTG, DST tools and Solid Control products.

KINGWELL have experienced team, stronger enough to meet any challenge, we do believe honest is the base of business and cooperation, our aim is to build solid relationship with any part of honest. kingwell can provide highly efficient services to its clients resulting in accurate and timely deliveries at the best prices.
is a professional supplier for oilfield products according to the API standard. We exporting ALL KINDS OF OILFIELD MACHINERY AND TOOLS with super Quality and Competitive Price in CHINA.

Now, Our Pup Joints have exported to USA, Egypt, India and UEA , etc with high quality and short supply and good service. Our Pup Joint has got good reputation home and abroad Here we got some prise as follows. 

6. About Warranty: Warranty period is 1 year after installation.

7.About Payment: 30% of the advance payments, delivery time, please pay 70%.

8. Sales Service:

We believe in Customer delight, achieved by the supply of Quality Products & Services and Continual Improvement in our Manufacturing Processes for timely delivery at competitive prices. We work in a professional, competitive, and cost-effective manner consistent with the Customer requirement. 

9. How to order?

Get in contact with us by email or phone and we will email you a full price list, post catalog if you ask, arrange time to visit us in china, Sign agreement with us, then delivery good.

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When ordering Pleasespecify:
Kelly type (square orhexagonal);
Nominal size and overalllength;
Upper and lowerConnections.