Drilling and milling
rotary kelly
Date:【2020-04-09 10:19】 Read:【】Times

 ROTARY KELLY

Kelly is main driver of the whole drill string . It transmits torsional energy from the rotary table through the drill string to the bit at the bottom of the hole . TIANHE Kelly is a long square or hexagonal , precision machined heavy steel bar that is supported by the swivel through the rotary table and is connected to the first Joint of drill pipe in the drill string.

 

Straightness of the kelly is very crucial in the manufacturing process , thus straightness inspections are carried out before , during and after each machining operation . The flats are precision-milled to API specifications . All milling processes are performed on specially designed rigid Kelly mills to ensure tight tolerances and high quality drive sections . Each TIANHE Kelly is furnished with a pressed steel thread protectors.

 

Features and Benefits

Manufactured from ASI 4145h-modified , fully heat-treated alloy steel with a Brinell hardness range of 285-341BHN and a minimum average Charpy impact value of 40 ft-lbs;

Ends and drive sections , IDS and connections machined and inspected to API specifications;

Ultrasonic inspection is performed on all sections;

Shipped in a protective steel-cased scabbard

 

When ordering please specify

Kelly type ( square or hexagonal

nominal size and overall length

Upper and lower connections

 

Specifications-Rotary Kelly

Nom Size(in)

Square Kelly Product Code

Hexagonal Kelly Product Code

Top Connection(LH)

Bottom Connection

I.D.(in)

Drive Section(in)

Standard O.D.(in)

Optional O.D.(in)

Square O.D(in)

Hex.O.D.(in)

 

Square

 

Hex.

 

A

 

B

2  1/2

Z03-130000

 

6 5/8 REG LH 7 3/4

4 1/2 REG LH 5 3/4

NC26 3 3/8

 

1 1/4

 

3 1/4

 

3

Z03-130100

Z04-130000

6 5/8 REG LH 7 3/4

4 1/2 REG LH 5 3/4

NC31 4 1/8

NC26 3 3/8

1 34/

1 1/4

3 3/8

3 3/8

3  1/2

Z03-130200

Z04-130100

6 5/8 REG LH 7 3/4

4 1/2 REG LH 5 3/4

NC 38 4 3/4

NC31 4 1/8

2 1/4

1 3/4

4 7/16

3 15/16

4  1/4

Z03-130300

Z04-130200

6 5/8 REG LH 7 3/4

4 1/2 REG LH 5 3/4

NC46 6 1/4

NC38 4 3/4

2 13/16

2 1/4

5 1/2

4 25/32

Z03-130400

Z04-130300

6 5/8 REG LH 7 3/4

4 1/2 REG LH 5 3/4

NC50 6 3/8

NC38 4 3/4

2 13*16

2 1/4      

5 1/2

4 25/32

5  1/4

Z03-130500

Z04-130400

6 5/8 REG LH 7 3/4

 

5 1/2FH  7

NC46 6 1/4

3 1/4

3

6 3/4

5 29/32

Z03-130600

Z04-130500

6 5/8 REG LH 7 3/4

 

NC56  7

NC50 6 3/8

3 1/4

3 1/4

6 3/4

5 29/32

6

 

Z04-130600

6 5/8 REG LH 7 3/4

 

 

5 1/2 FH 7

 

3 1/2

 

6 13/16

 

Z04-130700

6 5/8 REG LH 7 3/4

 

 

NC56 7

 

3 1/2

 

6 13/16

 

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